cmake: Use GNUInstallDirs to install data directories

Author: tgurr

CMakeLists.txt

@@ -2,6 +2,8 @@ cmake_minimum_required(VERSION 2.8.12)
 project(pahole C)
 cmake_policy(SET CMP0005 NEW)
 
+include(GNUInstallDirs)
+
 option(LIBBPF_EMBEDDED "Use the embedded version of libbpf instead of searching it via pkg-config" ON)
 if (NOT LIBBPF_EMBEDDED)
 	find_package(PkgConfig REQUIRED)
@@ -185,11 +187,11 @@ install(FILES dwarves.h dwarves_emit.h dwarves_reorganize.h
 	      btf_encoder.h config.h ctf.h
 	      elfcreator.h elf_symtab.h hash.h libctf.h
 	DESTINATION ${CMAKE_INSTALL_PREFIX}/include/dwarves/)
-install(FILES man-pages/pahole.1 DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man/man1/)
+install(FILES man-pages/pahole.1 DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/man/man1/")
 if(Python3_FOUND)
 	install(PROGRAMS ostra/ostra-cg DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
-	install(FILES ostra/python/ostra.py DESTINATION ${CMAKE_INSTALL_PREFIX}/share/dwarves/runtime/python)
+	install(FILES ostra/python/ostra.py DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/dwarves/runtime/python")
 endif()
 install(PROGRAMS btfdiff fullcircle DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
 install(FILES lib/Makefile lib/ctracer_relay.c lib/ctracer_relay.h lib/linux.blacklist.cu
-	DESTINATION ${CMAKE_INSTALL_PREFIX}/share/dwarves/runtime)
+	DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/dwarves/runtime")