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Detect and propagate _FORTIFY_SOURCE prefix

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Get prefix to a -D_FORTIFY_SOURCE string if it is present in
CFLAGS and apply the prefix to flags added to redefine
_FORTIFY_SOURCE in CFLAGS and CPPFLAGS

* fixes 1569
This commit is contained in:
Ross Smith 2014-12-12 12:45:21 -05:00
parent 742ada0869
commit 1c3d093c85
1 changed files with 8 additions and 2 deletions
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10
CMakeLists.txt
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@ -86,10 +86,16 @@ main(void)
" _FORTIFY_SOURCE_ACCEPTABLE)
if(NOT _FORTIFY_SOURCE_ACCEPTABLE)
# Extract possible prefix to _FORTIFY_SOURCE (e.g. -Wp,-D_FORTIFY_SOURCE).
STRING(REGEX MATCH "[^\ ]+-D_FORTIFY_SOURCE" _FORTIFY_SOURCE_PREFIX "${CMAKE_C_FLAGS}")
STRING(REPLACE "-D_FORTIFY_SOURCE" "" _FORTIFY_SOURCE_PREFIX "${_FORTIFY_SOURCE_PREFIX}" )
if (NOT _FORTIFY_SOURCE_PREFIX STREQUAL "")
message(STATUS "Detected _FORTIFY_SOURCE Prefix=${_FORTIFY_SOURCE_PREFIX}")
endif()
# -U in add_definitions doesn't end up in the correct spot, so we add it to
# the flags variable instead.
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_FORTIFY_SOURCE_PREFIX}-U_FORTIFY_SOURCE ${_FORTIFY_SOURCE_PREFIX}-D_FORTIFY_SOURCE=1")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_FORTIFY_SOURCE_PREFIX}-U_FORTIFY_SOURCE ${_FORTIFY_SOURCE_PREFIX}-D_FORTIFY_SOURCE=1")
endif()
add_definitions(-Wall -Wextra -pedantic -Wno-unused-parameter