[CMake] CHECK_CXX_COMPILER_FLAG doesn't give correct result for -fsanitize=address

[Marc CHEVRIER]

This is the expected behaviour.

As you already discovered, it is possible to control the compilation and link steps with variables as described in https://cmake.org/cmake/help/latest/module/CheckCXXSourceCompiles.html#module:CheckCXXSourceCompiles.

To specify, in a more clean way, link options, use preferably the variable CMAKE_REQUIRED_LINK_OPTIONS.

Le 24 oct. 2019 à 22:42 +0200, Michael Ellery <mellery451 at gmail.com>, a écrit :
> I’ve dealt with that using something like this:
>
> set (_saved_CRL ${CMAKE_REQUIRED_LIBRARIES})
> set (CMAKE_REQUIRED_LIBRARIES “-fsanitize=address;asan")
> check_cxx_compiler_flag (-fsanitize=address COMPILER_SUPPORTS_SAN)
> set (CMAKE_REQUIRED_LIBRARIES ${_saved_CRL})
>
> the second item in CMAKE_REQUIRED_LIBRARIES is only needed when using gcc which also requires a -lasan when linking (clang does not need this)
>
> > On Oct 24, 2019, at 12:47 PM, Turner, Adrian Keith via CMake <cmake at cmake.org> wrote:
> >
> > Hi CMake Mailing List,
> >
> > I am using the CHECK_CXX_COMPILER_FLAG directive in a CMake file to detect whether the compiler uses the "-fsanitize=address" compiler flag. I'm using the g++ 7.3.0 compiler which supports this flag but the CHECK_CXX_COMPILER_FLAG directive incorrectly determines that this flag is not supported.
> >
> > To test this I tried compiling the following program:
> > int main() {};
> >
> > This compiled with the following commands:
> > > g++ -fsanitize=address -c test.cpp
> > > g++ -fsanitize=address test.o -o test.exe
> >
> > And fails with the same error message as CHECK_CXX_COMPILER_FLAG when I compile with:
> > > g++ -fsanitize=address -c test.cpp
> > > g++ test.o -o test.exe
> >
> > producing the following message:
> > Undefined symbols for architecture x86_64:
> > "___asan_init", referenced from:
> > __GLOBAL__sub_I_00099_0_test.cpp in test.o
> > "___asan_version_mismatch_check_v8", referenced from:
> > __GLOBAL__sub_I_00099_0_test.cpp in test.o
> > ld: symbol(s) not found for architecture x86_64
> > collect2: error: ld returned 1 exit status
> >
> > It seems that CHECK_CXX_COMPILER_FLAG doesn't add the flag to the linking command when it tests compilation. Is this a bug with CHECK_CXX_COMPILER_FLAG or is there something I'm missing?
> >
> > Many thanks
> > Adrian Turner
> >
> >
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