[CMake] CMAKE_EXE_LINKER_FLAGS are not used for linking the compiler test; CMAKE_C_FLAGS are used instead

[Evgeniy Stepanov]

Hi,

I need to build a project with a weird set of compile/link flags:
CFLAGS = -fsanitize=memory
LINKFLAGS for executables = -fsanitize=memory -pie
LINKFLAGS for shared libraries = -fsanitize=memory

The trick is, linker flags have to be exactly this way: -pie can not be
omitted for executables (the other flag requires -pie, link will fail
without it), and, of course, it can not be specified for shared libraries.

I configure the project with

-DCMAKE_C_FLAGS=-fsanitize=memory -DCMAKE_EXE_LINKER_FLAGS=-pie

and get a failure in the compiler test:

[2/2] Linking C executable cmTryCompileExec3346801198
...
  clang-3: error: invalid argument '-fsanitize=memory' only allowed with
  '-pie'

Apparently, linking of the compiler test binary is done with
CMAKE_C_FLAGS, but without CMAKE_EXE_LINKER_FLAGS. Is it true? Why? Am
I missing something? Any workarounds?

Sorry if this is a duplicate message, it did not make it to the list
on the first try.