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Only define _FORTIFY_SOURCE if not built-in 

Some platforms (Alpine Linux being one) define _FORTIFY_SOURCE
as a built-in. Redefining it causes a compilation error since we
treat warnings as errors.

Fixes: #22
This commit is contained in:
Thomas Orozco 2015-11-03 16:29:00 +01:00
parent 9bfb4a505f
commit ad11e868f0
1 changed files with 16 additions and 1 deletions
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17
CMakeLists.txt
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@ -30,7 +30,22 @@ else()
endif() endif()
# Flags # Flags
add_definitions (-D_FORTIFY_SOURCE=2) include(CheckCSourceCompiles)
check_c_source_compiles("
#ifndef _FORTIFY_SOURCE
#error \"Not defined: _FORTIFY_SOURCE\"
#endif
int main(void) {
return 0;
}
" HAS_BUILTIN_FORTIFY)
# Flags
if(NOT HAS_BUILTIN_FORTIFY)
add_definitions(-D_FORTIFY_SOURCE=2)
endif()
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -Werror -Wextra -Wall -pedantic-errors -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat") set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -Werror -Wextra -Wall -pedantic-errors -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat")
set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-s") set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-s")