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CMakeLists.txt
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# C M A K E L I S T S . T X T
# BRL-CAD
#
# Copyright (c) 2010-2025 United States Government as represented by
# the U.S. Army Research Laboratory.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# NOTE: BRL-CAD as a collective work is distributed under the LGPL.
# BRL-CAD's build system is under the BSD license.
# See the COPYING file for more details.
#
# *******************************************************************
# *** BRL-CAD's CMakeLists.txt ***
# *******************************************************************
#
# This file defines the toplevel build logic for BRL-CAD. As
# reasonably possible, proper ordering and separation of tests should
# be added to the labeled sections below as follows:
#
# Stage 0 - project information
# Stage 1 - define top level options
# Stage 2 - check programs
# Stage 3 - check compiler characteristics
# Stage 4 - check libraries
# Stage 5 - check headers
# Stage 6 - check types/structures
# Stage 7 - check functions
# Stage 8 - check system services
# Stage 9 - define the BRL-CAD build targets
#
# There is an output summary printed at the end to report key info
# about the final build configuration. Details are available in the
# CMakeCache.txt file in the build directory.
#
# ***********************************************************
# * Stage 0 of 9 - Project Info *
# ***********************************************************
cmake_minimum_required(VERSION 3.20)
#---------------------------------------------------------------------
# BRL-CAD's version is centrally stored in include/conf/. See HACKING
# for details on updating the version.
file(READ "${CMAKE_CURRENT_SOURCE_DIR}/include/conf/MAJOR" BRLCAD_VERSION_MAJOR)
string(STRIP ${BRLCAD_VERSION_MAJOR} BRLCAD_VERSION_MAJOR)
file(READ "${CMAKE_CURRENT_SOURCE_DIR}/include/conf/MINOR" BRLCAD_VERSION_MINOR)
string(STRIP ${BRLCAD_VERSION_MINOR} BRLCAD_VERSION_MINOR)
file(READ "${CMAKE_CURRENT_SOURCE_DIR}/include/conf/PATCH" BRLCAD_VERSION_PATCH)
string(STRIP ${BRLCAD_VERSION_PATCH} BRLCAD_VERSION_PATCH)
set(BRLCAD_VERSION "${BRLCAD_VERSION_MAJOR}.${BRLCAD_VERSION_MINOR}.${BRLCAD_VERSION_PATCH}")
if(DEFINED BRLCAD_VERSION_AMEND)
set(BRLCAD_VERSION "${BRLCAD_VERSION}-${BRLCAD_VERSION_AMEND}")
endif(DEFINED BRLCAD_VERSION_AMEND)
#######
project(
BRLCAD
VERSION ${BRLCAD_VERSION}
DESCRIPTION "Open Source Solid Modeling"
HOMEPAGE_URL "https://brlcad.org"
LANGUAGES C CXX
)
#######
# Policy CMP0009: FILE GLOB_RECURSE calls should not follow symlinks by default
if(POLICY CMP0009)
cmake_policy(SET CMP0009 NEW)
endif(POLICY CMP0009)
# Policy CMP0060 tells CMake to use full paths in link specifications
if(POLICY CMP0060)
cmake_policy(SET CMP0060 NEW)
endif(POLICY CMP0060)
# Policy CMP0074 allows CMake to search
# "prefixes specified by the <PackageName>_ROOT in find_package"
# https://cmake.org/cmake/help/git-stage/policy/CMP0074.html
if(POLICY CMP0074)
cmake_policy(SET CMP0074 NEW)
endif(POLICY CMP0074)
# add_test() supports arbitrary characters in test name
if(POLICY CMP0110)
cmake_policy(SET CMP0110 NEW)
endif(POLICY CMP0110)
# cmake_dependent_option() supports full Condition Syntax
if(POLICY CMP0127)
cmake_policy(SET CMP0127 NEW)
endif(POLICY CMP0127)
# Policy CMP0177 now normalizes all installation paths
if(POLICY CMP0177)
cmake_policy(SET CMP0177 NEW)
endif(POLICY CMP0177)
message("CMAKE_SOURCE_DIR: ${CMAKE_SOURCE_DIR}")
message("CMAKE_BINARY_DIR: ${CMAKE_BINARY_DIR}")
if(NOT EXISTS "${CMAKE_SOURCE_DIR}/COPYING")
message(FATAL_ERROR "Invalid brlcad directory: ${CMAKE_SOURCE_DIR}")
endif(NOT EXISTS "${CMAKE_SOURCE_DIR}/COPYING")
if(CMAKE_ORIGINAL_SRC_DIR)
if(NOT "${CMAKE_ORIGINAL_SRC_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}")
message(FATAL_ERROR "Got ${CMAKE_ORIGINAL_SOURCE_DIR}/CMakeLists.txt from ${CMAKE_SOURCE_DIR}")
endif(NOT "${CMAKE_ORIGINAL_SRC_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}")
endif(CMAKE_ORIGINAL_SRC_DIR)
set(CMAKE_ORIGINAL_SRC_DIR "${CMAKE_SOURCE_DIR}" CACHE PATH "Source of original CMakeLists.txt file" FORCE)
#---------------------------------------------------------------------
# CMake derives much of its functionality from modules, typically
# stored in one directory - let CMake know where to find them. If we
# are a subbuild, let the parent's CMAKE_MODULE_PATH supply files before
# our own, otherwise misc/CMake takes first priority.
set(BRLCAD_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(BRLCAD_CMAKE_DIR "${BRLCAD_SOURCE_DIR}/misc/CMake")
list(APPEND CMAKE_MODULE_PATH "${BRLCAD_CMAKE_DIR}")
#---------------------------------------------------------------------
# GitHub is using .gitattributes to specify language types on files,
# so we need it if we want to correct language identifications. On the
# other hand, we DON'T want someone to use it to mark file patterns as
# text or binary - that is much too easy to get wrong, and the
# consequences can sometimes be very subtly incorrect/hard to debug.
#
# Introspect the .gitattributes file looking for problematic keywords
if(EXISTS "${BRLCAD_SOURCE_DIR}/.gitattributes")
file(STRINGS "${BRLCAD_SOURCE_DIR}/.gitattributes" ALINES)
set(dangerous_keywords "text;crlf;diff;eol")
foreach(aline ${ALINES})
if (NOT "${aline}" MATCHES "^#.*")
foreach(kwrd ${dangerous_keywords})
if ("${aline}" MATCHES ".*${kwrd}.*")
message(
FATAL_ERROR
"\nBRL-CAD does not use its .gitattributes file for identifying whether files are text or binary. This limitation prevents subtle errors from creeping in due to inadvertent pattern matches. See ${BRLCAD_SOURCE_DIR}/doc/git/mime_types.txt for an in-depth discussion of how to address cases where specific line endings are needed in text files.\n"
)
endif()
endforeach()
endif()
endforeach()
endif(EXISTS "${BRLCAD_SOURCE_DIR}/.gitattributes")
#---------------------------------------------------------------------
# Let CMake know where to look for our counting file for configuration
# passes. It will impact whether we print certain messages
set(BRLCAD_CNT_FILE "${BRLCAD_BINARY_DIR}/CMakeTmp/BRLCAD_BUILD_COUNT")
if(NOT EXISTS ${BRLCAD_CNT_FILE})
set(BRLCAD_PRINT_MSGS 1)
else(NOT EXISTS ${BRLCAD_CNT_FILE})
set(BRLCAD_PRINT_MSGS 0)
endif(NOT EXISTS ${BRLCAD_CNT_FILE})
# Now that we know whether or not we're supposed to, print the CMake version
if(BRLCAD_PRINT_MSGS)
message(STATUS "CMake version: ${CMAKE_VERSION}")
endif(BRLCAD_PRINT_MSGS)
#---------------------------------------------------------------------
# Management of build types (this normalizes or sets CMAKE_BUILD_TYPE)
include(BRLCAD_Build_Types)
InitializeBuildType()
NormalizeBuildType()
#---------------------------------------------------------------------
# Setup and checks related to system environment settings. Some of
# these impact search results needed to set default options, so we
# do this early in the process.
include(BRLCAD_Environment_Setup)
# We do NOT want CMake looking in the User Package Registry - have encountered
# at least one case where stale or incorrect information there has resulted in
# an incorrect include directory for Eigen based on bext build info.
set(CMAKE_FIND_USE_PACKAGE_REGISTRY FALSE)
# Populate these early, even though their main use is in
# misc/CMake/BRLCAD_ExternalDeps.cmake - find_program and find_package calls
# may also make use of them, particularly BRLCAD_EXT_NOINSTALL_DIR
set(BRLCAD_EXT_DIR_ENV "$ENV{BRLCAD_EXT_DIR}")
if(BRLCAD_EXT_DIR_ENV AND NOT DEFINED BRLCAD_EXT_DIR)
set(BRLCAD_EXT_DIR ${BRLCAD_EXT_DIR_ENV})
endif(BRLCAD_EXT_DIR_ENV AND NOT DEFINED BRLCAD_EXT_DIR)
if(DEFINED BRLCAD_EXT_DIR)
# Make sure we cache the BRLCAD_EXT_DIR setting - if we don't, then a re-configure
# with CMake is going to ignore a previously specified directory
set(BRLCAD_EXT_DIR "${BRLCAD_EXT_DIR}" CACHE PATH "BRL-CAD external dependency sources")
if(NOT DEFINED BRLCAD_EXT_INSTALL_DIR AND EXISTS "${BRLCAD_EXT_DIR}/install")
set(BRLCAD_EXT_INSTALL_DIR "${BRLCAD_EXT_DIR}/install")
endif(NOT DEFINED BRLCAD_EXT_INSTALL_DIR AND EXISTS "${BRLCAD_EXT_DIR}/install")
# Need to handle the case where BRLCAD_EXT_DIR is a symlink - if it
# is, we need to expand the symlink in order for the tar tricks we use
# later for file copying to work...
if(DEFINED BRLCAD_EXT_INSTALL_DIR AND IS_SYMLINK ${BRLCAD_EXT_INSTALL_DIR})
file(REAL_PATH "${BRLCAD_EXT_INSTALL_DIR}" EXT_PATH)
set(BRLCAD_EXT_INSTALL_DIR "${EXT_PATH}")
endif(DEFINED BRLCAD_EXT_INSTALL_DIR AND IS_SYMLINK ${BRLCAD_EXT_INSTALL_DIR})
# For noinstall we don't need to worry about symlinks since we'll be using
# the contents in place.
if(NOT DEFINED BRLCAD_EXT_NOINSTALL_DIR AND EXISTS "${BRLCAD_EXT_DIR}/noinstall")
set(BRLCAD_EXT_NOINSTALL_DIR "${BRLCAD_EXT_DIR}/noinstall")
endif(NOT DEFINED BRLCAD_EXT_NOINSTALL_DIR AND EXISTS "${BRLCAD_EXT_DIR}/noinstall")
endif(DEFINED BRLCAD_EXT_DIR)
# If we're doing the non-src-other build, we've got to have bext for at least a
# few custom components no matter how many system packages are installed.
if(NOT DEFINED BRLCAD_EXT_NOINSTALL_DIR OR NOT DEFINED BRLCAD_EXT_INSTALL_DIR)
message(
WARNING
"External dependencies will be downloaded, configured, and built automatically as-needed. Set BRLCAD_EXT_DIR to specify instead."
)
message(
STATUS
"BRLCAD_EXT_DIR specifies prebuilt external dependencies directory\n"
"containing 'install' and 'noinstall' folders, outputs from installing\n"
"https://github.com/BRL-CAD/bext.\n"
)
endif(NOT DEFINED BRLCAD_EXT_NOINSTALL_DIR OR NOT DEFINED BRLCAD_EXT_INSTALL_DIR)
# By default, we don't bundle bext into the source tarball for performance
# reasons, but the support is there if the dev wants to pay the price in time
# and disk space.
if(NOT DEFINED CPACK_INCLUDE_EXT)
set(CPACK_INCLUDE_EXT OFF)
endif(NOT DEFINED CPACK_INCLUDE_EXT)
# Before we do a lot of configure work, check whether we've got a type mismatch
# between bext and the BRL-CAD build type. If not, on Windows at least, it's a
# fatal error.
#
# NOTE: This test must come AFTER the inclusion of BRLCAD_Build_Types
if(CMAKE_BUILD_TYPE AND EXISTS "${BRLCAD_EXT_NOINSTALL_DIR}")
find_program(DUMPBIN_EXEC dumpbin)
set(TEST_BINFILE ${BRLCAD_EXT_NOINSTALL_DIR}/bin/strclear.exe)
if(DUMPBIN_EXEC AND EXISTS ${TEST_BINFILE})
# dumpbin doesn't like CMake style paths
file(TO_NATIVE_PATH "${TEST_BINFILE}" TBFN)
# https://stackoverflow.com/a/28304716/2037687
execute_process(COMMAND ${DUMPBIN_EXEC} /dependents ${TBFN} OUTPUT_VARIABLE DB_OUT ERROR_VARIABLE DB_OUT)
if("${CMAKE_BUILD_TYPE}" STREQUAL "Release")
if("${DB_OUT}" MATCHES ".*MSVCP[0-9]*d.dll.*" OR "${DB_OUT}" MATCHES ".*MSVCP[0-9]*D.dll.*")
message(
FATAL_ERROR
"Release build specified, but supplied bext binaries in ${BRLCAD_EXT_DIR} are compiled as Debug binaries."
)
endif("${DB_OUT}" MATCHES ".*MSVCP[0-9]*d.dll.*" OR "${DB_OUT}" MATCHES ".*MSVCP[0-9]*D.dll.*")
endif("${CMAKE_BUILD_TYPE}" STREQUAL "Release")
if("${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
if(NOT "${DB_OUT}" MATCHES ".*MSVCP[0-9]*d.dll.*" AND NOT "${DB_OUT}" MATCHES ".*MSVCP[0-9]*D.dll.*")
message(
FATAL_ERROR
"Debug build specified, but supplied bext binaries in ${BRLCAD_EXT_DIR} are compiled as Release binaries."
)
endif(NOT "${DB_OUT}" MATCHES ".*MSVCP[0-9]*d.dll.*" AND NOT "${DB_OUT}" MATCHES ".*MSVCP[0-9]*D.dll.*")
endif("${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
endif(DUMPBIN_EXEC AND EXISTS ${TEST_BINFILE})
endif(CMAKE_BUILD_TYPE AND EXISTS "${BRLCAD_EXT_NOINSTALL_DIR}")
#---------------------------------------------------------------------
# Define various utilities.
include(BRLCAD_Util)
#---------------------------------------------------------------------
# Define an option to use OBJECT libraries. If we are building with object
# libraries, we need position independent code.
include(CMakeDependentOption)
cmake_dependent_option(
USE_OBJECT_LIBS
"Use OBJECT libraries"
ON
"NOT MSVC"
OFF
)
mark_as_advanced(USE_OBJECT_LIBS)
if(USE_OBJECT_LIBS)
set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
endif(USE_OBJECT_LIBS)
#---------------------------------------------------------------------
# Record the CMake command line arguments (more or less) in
# CMakeFiles/CMakeOutput.log
record_cmdline_args()
#---------------------------------------------------------------------
# Set up the necessary support for timing of the configuration and
# build processes
string(TIMESTAMP CONFIG_DATE "%Y%m%d")
string(TIMESTAMP CONFIG_DATESTAMP "%a, %d %b %Y %H:%M:%S UTC" UTC)
#---------------------------------------------------------------------
# Mark the time at which the configuration process began.
set(CONFIG_DELTA_START "${CMAKE_BINARY_DIR}/CMakeTmp/CONFIG_DELTA_START")
execute_process(
COMMAND "${CMAKE_COMMAND}" -DSTAMP_FILE=${CONFIG_DELTA_START} -P "${BRLCAD_CMAKE_DIR}/scripts/timestamp.cmake"
)
#---------------------------------------------------------------------
# Define relative install locations and output directories. Don't set
# these if they have already been set by some other means (like a
# higher level CMakeLists.txt file including this one).
# For output directories - where built library and executable
# files will be placed after building but prior to install. The
# necessary variables change between single and multi configuration
# build systems, so it is necessary to handle both cases on a
# conditional basis.
include(Path_Setup)
#---------------------------------------------------------------------
# For cleaning files as part of the distclean command, CMake needs
# to be aware of what various generators will (or might) write out
# in each build directory.
set(DISTCLEAN_OUTFILES CTestTestfile.cmake Testing/Temporary/CTestCostData.txt Testing/Temporary/LastTest.log)
if("${CMAKE_GENERATOR}" MATCHES "Make")
set(DISTCLEAN_OUTFILES ${DISTCLEAN_OUTFILES} Makefile)
endif("${CMAKE_GENERATOR}" MATCHES "Make")
if("${CMAKE_GENERATOR}" MATCHES "Ninja")
set(DISTCLEAN_OUTFILES ${DISTCLEAN_OUTFILES} build.ninja rules.ninja .ninja_log)
endif("${CMAKE_GENERATOR}" MATCHES "Ninja")
#---------------------------------------------------------------------
# CMake's default "make test" target is a bit limited - define
# our own "unit" and "check" targets that automate more of the
# dependency updating process.
include(BRLCAD_Test_Wrappers)
#---------------------------------------------------------------------
# Load macros that will be used to define the BRL-CAD
# build logic
include(BRLCAD_Options)
include(BRLCAD_Targets)
include(CheckTypeSize)
include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)
#---------------------------------------------------------------------
# print out the title with a pretty box computed to wrap around
box_print("*** Configuring BRL-CAD Release ${BRLCAD_VERSION}, Build ${CONFIG_DATE} ***" "*")
#---------------------------------------------------------------------
# Set up include paths for generated header files.
include_directories(${CMAKE_BINARY_DIR}/${INCLUDE_DIR}/brlcad)
#---------------------------------------------------------------------
# We want to check /usr/local by default, so add it if it exists
if(IS_DIRECTORY /usr/local)
set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} /usr/local)
if(IS_DIRECTORY /usr/local/include)
set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} /usr/local/include)
endif(IS_DIRECTORY /usr/local/include)
endif(IS_DIRECTORY /usr/local)
#---------------------------------------------------------------------
# Intricacies involved with setting the install path mostly revolve
# around build type dependent install directories. Also needs the
# current version defined.
include(BRLCAD_Install_Prefix)
#---------------------------------------------------------------------
# RPath is used on platforms such as Linux to allow programs to be
# relocatable. It is also used to help programs run from their
# positions in the build directory.
#
# Managing this is somewhat involved - there are lots of situations
# where the logic will work because of a full path present in the
# rpath settings and mask a problem with the relative lookup.
# We want the full RPATH set in the build tree so we can run programs without
# needing to set LD_LIBRARY_PATH
set(CMAKE_SKIP_BUILD_RPATH FALSE)
# We DON'T want the final install directory RPATH set in the build directory -
# it should only be set to the installation value when actually installed.
set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
# Add the automatically determined parts of the RPATH which point to
# directories outside the build tree to the install RPATH
set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
# The following logic is what allows binaries to run successfully in the build
# directory AND install directory.
# This will need to be overridden for some targets that have a different
# relative position to LIB_DIR using the INSTALL_RPATH target property.
# However, we can cover the most common case for RPATH setting using the
# global default.
if(NOT APPLE)
set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${LIB_DIR}:$ORIGIN/../${LIB_DIR}")
else(NOT APPLE)
# For OSX, use the INSTALL_NAME_DIR target property
set(CMAKE_INSTALL_RPATH "@executable_path/../${LIB_DIR}")
set(CMAKE_INSTALL_NAME_DIR "@executable_path/../${LIB_DIR}")
endif(NOT APPLE)
#---------------------------------------------------------------------
# For certain platforms (in particular Visual C++) we want to keep some pre-defined
# flags that are commonly used in the build logic.
if(NOT DEFINED CMAKE_C_FLAGS_DEFAULT)
set(CMAKE_C_FLAGS_DEFAULT "${CMAKE_C_FLAGS}" CACHE STRING "Default C flags" FORCE)
endif(NOT DEFINED CMAKE_C_FLAGS_DEFAULT)
mark_as_advanced(CMAKE_C_FLAGS_DEFAULT)
if(NOT DEFINED CMAKE_CXX_FLAGS_DEFAULT)
set(CMAKE_CXX_FLAGS_DEFAULT "${CMAKE_CXX_FLAGS}" CACHE STRING "Default CXX flags" FORCE)
endif(NOT DEFINED CMAKE_CXX_FLAGS_DEFAULT)
mark_as_advanced(CMAKE_CXX_FLAGS_DEFAULT)
# OpenBSD 6.6 doesn't tolerate these flags when using #include <iostream>,
# so we have to test
#---------------------------------------------------------------------
# We need compiler support for certain C and C++ standards when we
# build. Set CMake's flags accordingly for what source code syntax
# (i.e., -std=xxx flags) and API (i.e., -D_POSIX_C_SOURCE defines) to
# permit and utilize respectively. Common profiles:
#
# 2011-2016: C11 & C++11 (reliably targets: 2013)
# ISO/IEC 9899:2011 __STDC_VERSION__==201112L
# ISO/IEC 14882:2011 __cplusplus==201103L
# IEEE 1003.1-2008 -D_POSIX_C_SOURCE=200809L
# Open Group Single UNIX Specification, Version 4 (2008+) -D_XOPEN_SOURCE=700
# 2014-2017: C11 & C++14 (reliably targets: 2016)
# ISO/IEC 9899:2011 __STDC_VERSION__==201112L
# ISO/IEC 14882:2014 __cplusplus==201402L
# IEEE 1003.1-2008 -D_POSIX_C_SOURCE=200809L
# Open Group Single UNIX Specification, Version 4 (2008+) -D_XOPEN_SOURCE=700
# 2017-2020: C11 & C++17 (reliably targets: 2019)
# ISO/IEC 9899:2011 __STDC_VERSION__==201112L
# ISO/IEC 14882:2017 __cplusplus==201703L
# IEEE 1003.1-2008 -D_POSIX_C_SOURCE=200809L
# Open Group Single UNIX Specification, Version 4 (2008+) -D_XOPEN_SOURCE=700
#
# Sources: https://sourceforge.net/p/predef/wiki/Standards/
include(BRLCAD_API_Flag)
set(API_FLAGS)
brlcad_api_flag("-D_POSIX_C_SOURCE=200809L" API_FLAGS)
brlcad_api_flag("-D_XOPEN_SOURCE=700" API_FLAGS)
# C
unset(C_STANDARD_FLAGS)
set(CMAKE_C_EXTENSIONS OFF)
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(C_STANDARD_FLAGS "${CMAKE_C_FLAGS_DEFAULT} ${CMAKE_C${CMAKE_C_STANDARD}_STANDARD_COMPILE_OPTION} ${API_FLAGS}")
string(STRIP "${C_STANDARD_FLAGS}" C_STANDARD_FLAGS)
# C++
unset(CXX_STANDARD_FLAGS)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(
CXX_STANDARD_FLAGS
"${CMAKE_CXX_FLAGS_DEFAULT} ${CMAKE_CXX${CMAKE_CXX_STANDARD}_STANDARD_COMPILE_OPTION} ${API_FLAGS}"
)
string(STRIP "${CXX_STANDARD_FLAGS}" CXX_STANDARD_FLAGS)
#---------------------------------------------------------------------
# We will need a brlcad_config.h.in file to hold all the #cmakedefine
# statements, which will in turn be used to generate a brlcad_conf.h
# file. In autotools this process is handled by autoheader - in the
# case of CMake we wrap the CHECK_* functions and the creation of the
# entry in the brlcad_config.h.in file into one step via a macro.
#
# To avoid hitting the disk I/O any harder than necessary, we store
# the eventual contents of brlcad_config.h.in as a CMake string until
# it is ready to process.
#
# We also allow for multiple projects with this macro, in case
# subprojects are also managing a config.h.in a file of their own.
set(CONFIG_H_FILE "${BRLCAD_BINARY_DIR}/include/brlcad_config.h.in")
set(CMAKE_CURRENT_PROJECT BRLCAD)
define_property(
GLOBAL
PROPERTY BRLCAD_CONFIG_H_CONTENTS
BRIEF_DOCS "config.h.in contents"
FULL_DOCS "config.h.in contents for BRL-CAD project"
)
if(NOT COMMAND CONFIG_H_APPEND)
function(CONFIG_H_APPEND PROJECT_NAME NEW_CONTENTS)
if(PROJECT_NAME)
get_property(${PROJECT_NAME}_CONFIG_H_CONTENTS GLOBAL PROPERTY ${PROJECT_NAME}_CONFIG_H_CONTENTS)
set(${PROJECT_NAME}_CONFIG_H_FILE_CONTENTS "${${PROJECT_NAME}_CONFIG_H_CONTENTS}${NEW_CONTENTS}")
set_property(GLOBAL PROPERTY ${PROJECT_NAME}_CONFIG_H_CONTENTS "${${PROJECT_NAME}_CONFIG_H_FILE_CONTENTS}")
endif(PROJECT_NAME)
endfunction(CONFIG_H_APPEND NEW_CONTENTS)
endif(NOT COMMAND CONFIG_H_APPEND)
config_h_append(BRLCAD "/**** Define statements for CMake ****/\n")
config_h_append(BRLCAD "#if !defined(BRLCADBUILD)\n")
config_h_append(BRLCAD " # pragma message \"Warning: included brlcad_config.h (compile-time API) without BRLCADBUILD defined\"\n"
)
config_h_append(BRLCAD "#endif\n")
config_h_append(BRLCAD "#if !defined(HAVE_CONFIG_H)\n")
config_h_append(BRLCAD " # pragma message \"Warning: included brlcad_config.h (compile-time API) without HAVE_CONFIG_H defined\"\n"
)
config_h_append(BRLCAD "#endif\n")
config_h_append(BRLCAD "#ifndef __CONFIG_H__\n")
config_h_append(BRLCAD "#define __CONFIG_H__\n")
# Set up some of the define statements for path information and other basics
config_h_append(BRLCAD "#define PACKAGE \"brlcad\"\n")
config_h_append(BRLCAD "#define PACKAGE_NAME \"BRL-CAD\"\n")
#----------------------------------------------------------------------
# Let our code know what the minimum active C++ standard is - behavior
# of some C++ functionality differs at runtime based on version.
config_h_append(BRLCAD "#define CXX_STANDARD ${CMAKE_CXX_STANDARD}\n")
# *******************************************************************
if(BRLCAD_PRINT_MSGS)
message("***********************************************************")
message("* Stage 1 of 9 - Top Level Configure Options *")
message("***********************************************************")
endif(BRLCAD_PRINT_MSGS)
include(BRLCAD_User_Options)
# global msvc-specific configuration setup
if("${CMAKE_GENERATOR}" MATCHES "Visual Studio")
# Auto-reconfiguration - by default, a CMake generated build system
# will re-run CMake if it detects that build system logic has
# changed. This is normally a good thing, but becomes problematic
# when using Visual Studio - recent versions of MSVC will
# individually prompt for a re-loading of generated solution files
# one at a time. Since BRL-CAD has over a thousand such files in a
# default build, the only viable approach is to close Visual Studio,
# re-run CMake manually, and re-open the project in Visual Studio.
set(CMAKE_SUPPRESS_REGENERATION ON)
# make visual studio default to a more useful output summary instead
# of minimal lines with no compilation context.
if(NOT DEFINED CMAKE_VERBOSE_MAKEFILE)
set(CMAKE_VERBOSE_MAKEFILE ON)
endif(NOT DEFINED CMAKE_VERBOSE_MAKEFILE)
endif("${CMAKE_GENERATOR}" MATCHES "Visual Studio")
# *******************************************************************
if(BRLCAD_PRINT_MSGS)
message("***********************************************************")
message("* Stage 2 of 9 - Check for Programs *")
message("***********************************************************")
endif(BRLCAD_PRINT_MSGS)
# Load various wrapper macros for checking libraries, headers and
# functions
include(BRLCAD_CheckFunctions)
# A variety of tools, such as the benchmark utilities, need
# a Bourne shell and other commands - check for them.
include(FindShellDeps)
# If using dtrace, we will need to find it
if(BRLCAD_ENABLE_DTRACE)
find_program(DTRACE_EXEC NAMES dtrace DOC "path to dtrace executable")
endif(BRLCAD_ENABLE_DTRACE)
# SWIG is an automatic generator of wrappers for various
# software languages
find_package(SWIG)
mark_as_advanced(SWIG_EXECUTABLE)
mark_as_advanced(SWIG_DIR)
mark_as_advanced(SWIG_VERSION)
# Doxygen is a tool for generating formatted documentation
# from structured source code comments.
include(Doxygen)
find_package(Doxygen)
# Define high level features of BRL-CAD. We define the features here,
# to allow for the possibility that this is a Doxygen-only build (i.e.
# we won't be processing most of the build logic and are just setting
# up for our Doxygen run.
doxygen_feature("Portability Library" DESCRIPTION "Portability layer that makes sure basic low level system functionality is present across all platforms via a uniform API.")
doxygen_feature("Solid Raytracing" DESCRIPTION "Ray/geometry intersection calculations that report not just first surface hits but in/out pairs of hits to support the characterization of closed geometric volumes.")
# If we ONLY want to produce Doxygen output, there's no point in doing
# the full configure and bext build process
if(BRLCAD_DOXYGEN_ONLY)
file(MAKE_DIRECTORY "${BRLCAD_BINARY_DIR}/doc")
add_subdirectory(misc/doxygen)
doxygen_feature_summary("${BRLCAD_BINARY_DIR}/CMakeTmp/features.dox")
return()
endif(BRLCAD_DOXYGEN_ONLY)
# *******************************************************************
if(BRLCAD_PRINT_MSGS)
message("***********************************************************")
message("* Stage 3 of 9 - Check for Compiler Characteristics *")
message("***********************************************************")
endif(BRLCAD_PRINT_MSGS)
# load our compiler testing macro definitions
include(CompilerFlags)
# Clear out most CMake-assigned defaults - We're managing
# our own compile flags, and don't (for example) want NDEBUG
# if we have debugging flags enabled for a Release build.
# At the same time, pull in any flags that have been set
# in the environment.
clear_build_flags()
# We need the C and C++ standards
set(CMAKE_C_FLAGS "${C_STANDARD_FLAGS}")
set(CMAKE_CXX_FLAGS "${CXX_STANDARD_FLAGS}")
# try to use -pipe to speed up the compiles
check_c_flag(pipe)
check_cxx_flag(pipe)
# Enable visibility restrictions. We have to deal with this on Windows, so
# enable it wherever we can to keep the code working across all platforms.
check_c_flag(fvisibility=hidden)
check_cxx_flag(fvisibility=hidden)
# If we can, hide internal library symbols
if(FVISIBILITY_HIDDEN_CXX_FLAG_FOUND)
set(HIDE_INTERNAL_SYMBOLS 1)
endif(FVISIBILITY_HIDDEN_CXX_FLAG_FOUND)
if(MSVC)
# On platforms other than MSVC, the hidden symbols are a convenience and may
# not be supported by system lib headers. With Visual Studio, they are a
# necessity - define an extra flag so we know to always set them in that
# case in order to properly link against the system libs.
set(HIDE_INTERNAL_SYMBOLS 1)
set(HIDE_INTERNAL_SYMBOLS_EXT 1)
endif(MSVC)
# check for -fno-strict-aliasing
# XXX - THIS FLAG IS REQUIRED if any level of optimization is
# enabled with GCC as we do use aliasing and type-punning.
check_c_flag(fno-strict-aliasing)
check_cxx_flag(fno-strict-aliasing)
# check for -fno-common (libtcl needs it on darwin)
check_c_flag(fno-common)
check_cxx_flag(fno-common)
# check for -fexceptions
# this is needed to resolve __Unwind_Resume when compiling and
# linking against openNURBS in librt for any -static binaries
check_c_flag(fexceptions)
check_cxx_flag(fexceptions)
# check for -ftemplate-depth-NN this is needed in libpc and
# other code using boost where the template instantiation depth
# needs to be increased from the default ANSI minimum of 17.
check_cxx_flag(ftemplate-depth-128)
# dynamic SSE optimizations for NURBS processing
#
# XXX disable the SSE flags for now as they can cause illegal instructions.
# the test needs to also be tied to run-time functionality since gcc
# may still output SSE instructions (e.g., for cross-compiling).
# CHECK_C_FLAG(msse)
# CHECK_C_FLAG(msse2)
# CHECK_C_FLAG(msse3)
# TODO - should be using this with MSVC, but it breaks the BUILD_SLEEP
# try_compile below with errors that appear to be coming from Windows
# headers??
# CHECK_C_FLAG("Za")
# 64bit compilation flags
if(${CMAKE_WORD_SIZE} MATCHES "64BIT" AND NOT CMAKE_CL_64)
check_c_flag(m64 VARS 64BIT_FLAG)
check_c_flag("arch x86_64" VARS 64BIT_FLAG)
check_c_flag(64 VARS 64BIT_FLAG)
check_c_flag("mabi=64" VARS 64BIT_FLAG)
check_c_flag(q64 VARS 64BIT_FLAG)
if(64BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "64BIT")
add_new_flag(C 64BIT_FLAG ALL)
add_new_flag(CXX 64BIT_FLAG ALL)
add_new_flag(SHARED_LINKER 64BIT_FLAG ALL)
add_new_flag(EXE_LINKER 64BIT_FLAG ALL)
endif(64BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "64BIT")
endif(${CMAKE_WORD_SIZE} MATCHES "64BIT" AND NOT CMAKE_CL_64)
# 32 bit compilation flags
if(${CMAKE_WORD_SIZE} MATCHES "32BIT" AND NOT ${BRLCAD_WORD_SIZE} MATCHES "AUTO" AND NOT MSVC)
check_c_flag(m32 VARS 32BIT_FLAG)
check_c_flag("arch i686" VARS 32BIT_FLAG)
check_c_flag(32 VARS 32BIT_FLAG)
check_c_flag("mabi=32" VARS 32BIT_FLAG)
check_c_flag(q32 VARS 32BIT_FLAG)
if(32BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "32BIT")
add_new_flag(C 32BIT_FLAG ALL)
add_new_flag(CXX 32BIT_FLAG ALL)
add_new_flag(SHARED_LINKER 32BIT_FLAG ALL)
add_new_flag(EXE_LINKER 32BIT_FLAG ALL)
endif(32BIT_FLAG AND ${CMAKE_WORD_SIZE} MATCHES "32BIT")
endif(${CMAKE_WORD_SIZE} MATCHES "32BIT" AND NOT ${BRLCAD_WORD_SIZE} MATCHES "AUTO" AND NOT MSVC)
# Debugging flags
if(BRLCAD_DEBUGGING)
check_c_flag(g GROUPS DEBUG_C_FLAGS)
check_cxx_flag(g GROUPS DEBUG_CXX_FLAGS)
check_c_flag(ggdb3 GROUPS DEBUG_C_FLAGS)
check_cxx_flag(ggdb3 GROUPS DEBUG_CXX_FLAGS)
set(debug_config_list "ALL")
add_new_flag(C DEBUG_C_FLAGS "${debug_config_list}")
add_new_flag(CXX DEBUG_CXX_FLAGS "${debug_config_list}")
# TODO - need to figure out a way to actually test linker flags
add_new_flag(SHARED_LINKER DEBUG_C_FLAGS "${debug_config_list}")
add_new_flag(EXE_LINKER DEBUG_C_FLAGS "${debug_config_list}")
mark_as_advanced(DEBUG_FLAGS)
endif(BRLCAD_DEBUGGING)
# Warn if no minimum compilation linkage is set for Mac systems
if(APPLE AND "${CMAKE_BUILD_TYPE}" STREQUAL "Release" AND "$ENV{MACOSX_DEPLOYMENT_TARGET}" STREQUAL "")
message(
WARNING
"}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}\nMACOSX_DEPLOYMENT_TARGET should be set for release builds\nto something less than the latest release for portability\ne.g., export MACOSX_DEPLOYMENT_TARGET=10.5\nSee https://github.com/brlcad/MacOSX-SDKs\n}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}"
)
endif(APPLE AND "${CMAKE_BUILD_TYPE}" STREQUAL "Release" AND "$ENV{MACOSX_DEPLOYMENT_TARGET}" STREQUAL "")
# Most external projects have their own logic for handling
# the C inline issue - BRL-CAD needs a fine-grained approach.
# C and C++ sources require different treatment for the same build
# target, since C++11 doesn't allow inline to be re-defined.
check_c_inline(C_INLINE)
if(NOT HAVE_INLINE_KEYWORD AND HAVE___INLINE_KEYWORD)
config_h_append(BRLCAD "#ifndef __cplusplus\n")
config_h_append(BRLCAD "# define inline __inline\n")
config_h_append(BRLCAD "#endif /* !__cplusplus */\n")
elseif(HAVE_INLINE_KEYWORD)
# this ugly hack is to avoid broken Mac OS X (10.13 era) ctype
# headers that drop the inline keyword when compiling c99.
config_h_append(BRLCAD "#if !defined(inline) && !defined(__cplusplus)\n")
config_h_append(BRLCAD "# define inline inline\n")
config_h_append(BRLCAD "#endif /* !inline && !__cplusplus */\n")
endif(NOT HAVE_INLINE_KEYWORD AND HAVE___INLINE_KEYWORD)
# If building optimized, set _FORTIFY_SOURCE to 2. Provides
# compile-time best-practice error checking on certain libc functions
# (e.g., memcpy), and provides run-time checks on buffer lengths and
# memory regions. Unfortunately, glibc-1.6 made _FORTIFY_SOURCE spew
# an unquellable warning if optimization is disabled so we can't tie
# the flag to debug builds.
#
# TODO (3/2024) - is glibc-1.6 old enough now that we could fold this into the
# debug build flags?
if(${BRLCAD_OPTIMIZED} MATCHES "ON")
config_h_append(BRLCAD "#ifndef _FORTIFY_SOURCE\n# define _FORTIFY_SOURCE 2\n#endif\n")
endif(${BRLCAD_OPTIMIZED} MATCHES "ON")
# Enable this flag for additional reporting of undefined symbols.
# TODO: Fixing these is a work in progress.
# CHECK_C_COMPILER_FLAG("Wl,--no-undefined" NO_UNDEFINED_LINKER_FLAG)
# ******************************************************************* #
# For some tests, we need Werror to make sure the test actually fails
cmake_push_check_state(RESET)
check_c_flag(Werror VARS ERROR_FLAG)
if(ERROR_FLAG)
set(CMAKE_REQUIRED_FLAGS "-Werror")
endif(ERROR_FLAG)
# Check whether the compiler supports __attribute__((format (__printf__, 1, 2)))
check_c_source_compiles(
"int pf(const char *f, ...) __attribute__((format (__printf__, 1, 2))); int pf(const char *f, ...){return 1;} int main(int argc, char *argv[]) {return pf(\"%c\",'a');}"
HAVE_PRINTF12_ATTRIBUTE
)
if(HAVE_PRINTF12_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_PRINTF12_ATTRIBUTE 1\n")
endif(HAVE_PRINTF12_ATTRIBUTE)
# Check whether the compiler supports __attribute__((format (__printf__, 2, 3)))
check_c_source_compiles(
"int pf(void *o, const char *f, ...) __attribute__((format (__printf__, 2, 3))); int pf(void *o, const char *f, ...){return 1;} int main(int argc, char *argv[]) {return pf((void *)0, \"%c\",'a');}"
HAVE_PRINTF23_ATTRIBUTE
)
if(HAVE_PRINTF23_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_PRINTF23_ATTRIBUTE 1\n")
endif(HAVE_PRINTF23_ATTRIBUTE)
# Check whether the compiler supports __attribute__((format (__scanf__, 2, 3)))
check_c_source_compiles(
"int sf(void *o, const char *f, ...) __attribute__((format (__scanf__, 2, 3))); int sf(void *o, const char *f, ...){return 1;} int main(int argc, char *argv[]) {int i = 1; return sf((void *)0, \"%d\", &i);}"
HAVE_SCANF23_ATTRIBUTE
)
if(HAVE_SCANF23_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_SCANF23_ATTRIBUTE 1\n")
endif(HAVE_SCANF23_ATTRIBUTE)
# Check whether the compiler supports __attribute__((deprecated))
check_c_source_compiles(
"__attribute__((deprecated)) void func(void); void func(void){} void func2(void){} int main(int argc, char *argv[]) {func2(); return 0;}"
HAVE_DEPRECATED_ATTRIBUTE
)
if(HAVE_DEPRECATED_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_DEPRECATED_ATTRIBUTE 1\n")
endif(HAVE_DEPRECATED_ATTRIBUTE)
# Check whether the compiler supports __declspec(deprecated())
check_c_source_compiles(
"__declspec(deprecated(\"DEPRECATED\")) void func(void); void func(void){} void func2(void){} int main(int argc, char *argv[]) {func2(); return 0;}"
HAVE_DEPRECATED_DECLSPEC
)
if(HAVE_DEPRECATED_DECLSPEC)
config_h_append(BRLCAD "#define HAVE_DEPRECATED_DECLSPEC 1\n")
endif(HAVE_DEPRECATED_DECLSPEC)
# Check whether the compiler supports __attribute__((__noreturn__))
check_c_source_compiles(
"#include <stdlib.h>
__attribute__((__noreturn__)) void noret(void); void noret(void){exit(1);} int main(int argc, char *argv[]) {noret(); return 0;}"
HAVE_NORETURN_ATTRIBUTE
)
if(HAVE_NORETURN_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_NORETURN_ATTRIBUTE 1\n")
endif(HAVE_NORETURN_ATTRIBUTE)
# Check whether the compiler supports __declspec(noreturn)
check_c_source_compiles(
"#include <stdlib.h>
__declspec(noreturn) void noret(void) {exit(1);} int main(int argc, char *argv[]) {noret(); return 0;}"
HAVE_NORETURN_DECLSPEC
)
if(HAVE_NORETURN_DECLSPEC)
config_h_append(BRLCAD "#define HAVE_NORETURN_DECLSPEC 1\n")
endif(HAVE_NORETURN_DECLSPEC)
# Check whether the compiler supports __attribute__((analyzer_noreturn))
check_c_source_compiles(
"__attribute__((analyzer_noreturn)) void anoret(void); void anoret(void){return;} int main(int argc, char *argv[]) {anoret(); return 0;}"
HAVE_ANALYZER_NORETURN_ATTRIBUTE
)
if(HAVE_ANALYZER_NORETURN_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_ANALYZER_NORETURN_ATTRIBUTE 1\n")
endif(HAVE_ANALYZER_NORETURN_ATTRIBUTE)
# Check whether the compiler supports __attribute__((always_inline))
check_c_source_compiles(
"__attribute__((always_inline)) inline void always_inline(void); inline void always_inline(void){return;} int main(int argc, char *argv[]) {always_inline(); return 0;}"
HAVE_ALWAYS_INLINE_ATTRIBUTE
)
if(HAVE_ALWAYS_INLINE_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_ALWAYS_INLINE_ATTRIBUTE 1\n")
endif(HAVE_ALWAYS_INLINE_ATTRIBUTE)
# Check whether the compiler supports __forceinline
check_c_source_compiles(
"__forceinline inline void always_inline(void); inline void always_inline(void){return;} int main(int argc, char *argv[]) {always_inline(); return 0;}"
HAVE_FORCEINLINE
)
if(HAVE_FORCEINLINE)
config_h_append(BRLCAD "#define HAVE_FORCEINLINE 1\n")
endif(HAVE_FORCEINLINE)
# Check whether the compiler supports __attribute__((const))
check_c_source_compiles(
"__attribute__((const)) void func(void); void func(void){return;} int main(int argc, char *argv[]) {func(); return 0;}"
HAVE_CONST_ATTRIBUTE
)
if(HAVE_CONST_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_CONST_ATTRIBUTE 1\n")
endif(HAVE_CONST_ATTRIBUTE)
# Check whether the compiler supports __attribute__((pure))
check_c_source_compiles(
"__attribute__((pure)) void func(void); void func(void){return;} int main(int argc, char *argv[]) {func(); return 0;}"
HAVE_PURE_ATTRIBUTE
)
if(HAVE_PURE_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_PURE_ATTRIBUTE 1\n")
endif(HAVE_PURE_ATTRIBUTE)
# Check whether the compiler supports __attribute__((cold))
check_c_source_compiles(
"__attribute__((cold)) void func(void); void func(void){return;} int main(int argc, char *argv[]) {func(); return 0;}"
HAVE_COLD_ATTRIBUTE
)
if(HAVE_COLD_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_COLD_ATTRIBUTE 1\n")
endif(HAVE_COLD_ATTRIBUTE)
# Check whether the compiler supports __attribute__((hot))
check_c_source_compiles(
"__attribute__((hot)) void func(void); void func(void){return;} int main(int argc, char *argv[]) {func(); return 0;}"
HAVE_HOT_ATTRIBUTE
)
if(HAVE_HOT_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_HOT_ATTRIBUTE 1\n")
endif(HAVE_HOT_ATTRIBUTE)
# Check whether the compiler supports __attribute__((nonnull))
check_c_source_compiles(
"__attribute__((nonnull)) int *func(int *); int *func(int *v){(*v)-=1; return v;} int main(int argc, char *argv[]) {int v = 1; int *vp = func(&v); return *vp;}"
HAVE_NONNULL_ATTRIBUTE
)
if(HAVE_NONNULL_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_NONNULL_ATTRIBUTE 1\n")
endif(HAVE_NONNULL_ATTRIBUTE)
# Check whether the compiler supports __attribute__((warn_unused_result))
check_c_source_compiles(
"__attribute__((warn_unused_result)) int *func(int *); int *func(int *v){(*v)-=1; return v;} int main(int argc, char *argv[]) {int v = 1; int *vp = func(&v); return *vp;}"
HAVE_WARN_UNUSED_RESULT_ATTRIBUTE
)
if(HAVE_WARN_UNUSED_RESULT_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_WARN_UNUSED_RESULT_ATTRIBUTE 1\n")
endif(HAVE_WARN_UNUSED_RESULT_ATTRIBUTE)
# Check whether the compiler supports __attribute__((flatten))
check_c_source_compiles(
"__attribute__((flatten)) int *func(int *v){(*v)-=1; return v;} __attribute((flatten)) int main(int argc, char *argv[]) {int v = 1; int *vp = func(&v); return *vp;}"
HAVE_FLATTEN_ATTRIBUTE
)
if(HAVE_FLATTEN_ATTRIBUTE)
config_h_append(BRLCAD "#define HAVE_FLATTEN_ATTRIBUTE 1\n")
endif(HAVE_FLATTEN_ATTRIBUTE)
# Silence check for unused arguments (used to silence clang warnings about
# unused options on the command line). By default clang generates a lot of
# warnings about such arguments, and we don't really care.
check_c_flag(Qunused-arguments)
check_cxx_flag(Qunused-arguments)
cmake_pop_check_state()
# The following tests are almost entirely for gcc/llvm style flags, so
# we don't unnecessarily slow down the Windows build.
if(NOT MSVC)
# This is nominally a header test, but because it can impact the C/C++ flags
# we do it before the final caching of BRL-CAD flags. We need this because
# pthread headers on some BSD platforms still haven't been scrubbed for
# c90/posix.1 compliance - see r70785
brlcad_include_file(pthread.h PROBE_PTHREAD_H)
if(NOT PROBE_PTHREAD_H)
cmake_push_check_state(RESET)
# pthread.h on FreeBSD 10 and some older Linucies use non-c90 types
set(CMAKE_REQUIRED_DEFINITIONS "-Dclockid_t=clock_t")
set(CMAKE_REQUIRED_FLAGS "-pthread")
brlcad_include_file(pthread.h PROBE_PTHREAD_H_CLOCKID_T)
if(PROBE_PTHREAD_H_CLOCKID_T)
set(C_STANDARD_FLAGS "${C_STANDARD_FLAGS} -Dclockid_t=clock_t -pthread")
set(CXX_STANDARD_FLAGS "${CXX_STANDARD_FLAGS} -Dclockid_t=clock_t -pthread")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Dclockid_t=clock_t -pthread")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Dclockid_t=clock_t -pthread")
endif(PROBE_PTHREAD_H_CLOCKID_T)
endif(NOT PROBE_PTHREAD_H)
# -O3/-Ofast can enable -ffast-math which can provoke a stack
# corruption in the shadow computations because of strict aliasing
# getting enabled. we _require_ -fno-strict-aliasing until someone
# changes how lists are managed. -fast-math results in non-IEEE
# floating point math among a handful of other optimizations that
# cause substantial error in ray tracing and tessellation (and
# probably more).
check_c_flag(O3 GROUPS OPTIMIZE_C_FLAGS)
check_cxx_flag(O3 GROUPS OPTIMIZE_CXX_FLAGS)
# goes a step beyond O3, possibly using dangerous imprecise math
# CHECK_C_FLAG(Ofast GROUPS OPTIMIZE_C_FLAGS)
# CHECK_CXX_FLAG(Ofast GROUPS OPTIMIZE_CXX_FLAGS)
# binaries will not necessarily work on a different machine
# CHECK_C_FLAG(march=native GROUPS OPTIMIZE_C_FLAGS)
# CHECK_CXX_FLAG(march=native GROUPS OPTIMIZE_CXX_FLAGS)
# perform interprocedural analysis, slows compilation heavily