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

[Turner, Adrian Keith]

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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