build: fix posix builds

Signed-off-by: hexian000 <[email protected]>

CMakeLists.txt

@@ -46,7 +46,7 @@ message(STATUS "Project version: ${PROJECT_VERSION_STRING}")
 
 include(CTest)
 
-option(TARGET_POSIX "Use POSIX API only" OFF)
+option(FORCE_POSIX "Use POSIX-compliant APIs only" OFF)
 option(BUILD_STATIC "Build static executables, link everything statically" OFF)
 option(LINK_STATIC_LIBS "Link against static libraries" OFF)
 option(ENABLE_SANITIZERS "Build with sanitizers" OFF)
@@ -77,9 +77,10 @@ elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
     endif()
 endif()
 
-if(NOT TARGET_POSIX AND (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android"))
+if(NOT FORCE_POSIX AND (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android"))
     message(STATUS "Linux system: ${CMAKE_SYSTEM_NAME} ${CMAKE_SYSTEM_VERSION}")
     list(APPEND CMAKE_REQUIRED_DEFINITIONS "-D_GNU_SOURCE")
+    set(TARGET_LINUX TRUE)
 else()
     message(STATUS "POSIX-compliant system: ${CMAKE_SYSTEM_NAME} ${CMAKE_SYSTEM_VERSION}")
     list(APPEND CMAKE_REQUIRED_DEFINITIONS "-D_POSIX_C_SOURCE=200809L")

contrib/csnippets/CMakeLists.txt

@@ -4,7 +4,7 @@ target_compile_options(csnippets PUBLIC "-include${CMAKE_CURRENT_BINARY_DIR}/con
 target_compile_options(csnippets PRIVATE -pedantic -Wall -Wextra)
 target_compile_definitions(csnippets PUBLIC MCACHE_STATS=0)
 
-if(NOT TARGET_POSIX AND (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android"))
+if(TARGET_LINUX)
     target_compile_definitions(csnippets PRIVATE _GNU_SOURCE)
 else()
     target_compile_definitions(csnippets PRIVATE _POSIX_C_SOURCE=200809L)

m.sh

@@ -67,7 +67,7 @@ case "$1" in
     cmake -G "${GENERATOR}" \
         -DCMAKE_BUILD_TYPE="Release" \
         -DCMAKE_EXPORT_COMPILE_COMMANDS=1 \
-        -DTARGET_POSIX=1 \
+        -DFORCE_POSIX=1 \
         -S "." -B "build"
     nice cmake --build "build"
     ls -lh "build/src/kcptun-libev"

src/CMakeLists.txt

@@ -11,7 +11,7 @@ add_executable(kcptun-libev main.c
     obfs.c obfs.h
     event_tcp.c event_kcp.c event_pkt.c event_http.c event_timer.c event.h event_impl.h)
 
-if(NOT TARGET_POSIX AND (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android"))
+if(TARGET_LINUX)
     target_compile_definitions(kcptun-libev PRIVATE _GNU_SOURCE)
 else()
     target_compile_definitions(kcptun-libev PRIVATE _POSIX_C_SOURCE=200809L)
@@ -71,7 +71,7 @@ if(WITH_SODIUM)
     set(WITH_CRYPTO TRUE)
 endif()
 
-if(WITH_CRYPTO AND (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android"))
+if(WITH_CRYPTO AND TARGET_LINUX)
     set(WITH_OBFS TRUE)
 endif()