UPD. forgot to CC the mailing list Hi,
I am also confused by this and decided to test it. I found a long thread from 2012 <https://cmake.org/pipermail/cmake-developers/2012-August/thread.html#16509> that discusses list expansion issues. It doesn't tell though whether the patch was mainlined. tldr; if you quote the whole genexpr, the list will expand properly. Below is the working code. ---------------------------------------------------------------------- cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(recipe-09 CXX) set(CMAKE_CXX_STANDARD 11) set(CMAKE_CXX_EXTENSIONS OFF) set(CMAKE_CXX_STANDARD_REQUIRED ON) list(APPEND CXX_BASIC_FLAGS "-g3" "-O1") include(CheckCXXCompilerFlag) set(ASAN_FLAGS "-fsanitize=address -fno-omit-frame-pointer") set(CMAKE_REQUIRED_FLAGS ${ASAN_FLAGS}) check_cxx_compiler_flag(${ASAN_FLAGS} asan_works) unset(CMAKE_REQUIRED_FLAGS) add_executable(asan-example asan-example.cpp) string(REPLACE " " ";" _asan_flags ${ASAN_FLAGS}) target_compile_options(asan-example PUBLIC ${CXX_BASIC_FLAGS} $<$<BOOL:${asan_works}>:${_asan_flags}> ) target_link_libraries(asan-example PUBLIC "$<$<BOOL:${asan_works}>:${_asan_flags}>" # <-- NOTE THIS ) ---------------------------------------------------------------------- On 19.11.2017 19:16, Roberto Di Remigio wrote: > Hello, > I am trying to compile the following code snippet: > > int main(int argc, char ** argv) { > int stack_array[100]; > stack_array[1] = 0; > return stack_array[argc + 100]; // BOOM > } > > The followin CMakeLists.txt works fine, but you can notice that > target_compile_options takes a list, while target_link_libraries takes a > string. Always using the string will result in a compilation error, > because the compiler flags are passed quoted to the compiler. Always > using the list doesn't work either, because the generator expression is > evaluated as $<1:-fsanitize=address -fno-omit-frame-pointer> and then > passed as-is to the linker, which doesn't know what to do with it. > Is this supposed to be like this? If yes, what's the rationale? > Thanks in advance! > Roberto > > cmake_minimum_required(VERSION 3.3 FATAL_ERROR) > > project(recipe-09 CXX) > > set(CMAKE_CXX_STANDARD 11) > set(CMAKE_CXX_EXTENSIONS OFF) > set(CMAKE_CXX_STANDARD_REQUIRED ON) > > list(APPEND CXX_BASIC_FLAGS "-g3" "-O1") > > include(CheckCXXCompilerFlag) > > set(ASAN_FLAGS "-fsanitize=address -fno-omit-frame-pointer") > set(CMAKE_REQUIRED_FLAGS ${ASAN_FLAGS}) > check_cxx_compiler_flag(${ASAN_FLAGS} asan_works) > unset(CMAKE_REQUIRED_FLAGS) > > add_executable(asan-example asan-example.cpp) > string(REPLACE " " ";" _asan_flags ${ASAN_FLAGS}) > target_compile_options(asan-example > PUBLIC > ${CXX_BASIC_FLAGS} > $<$<BOOL:${asan_works}>:${_asan_flags}> > ) > target_link_libraries(asan-example > PUBLIC > $<$<BOOL:${asan_works}>:${ASAN_FLAGS}> > ) > > -- Regards, Oleksii Vilchanskyi PGP:0x8D3A0E046BDE941F2A53867CE3FD952D48C0B338
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