Re: Mac Build Error

[Guy Harris <guy () alum mit edu>]

On Jan 21, 2016, at 12:10 PM, David Morsberger <dave () morsberger com> wrote:

> I think this is a bug in cmake because:
>  
> 1. the 'and run' in "CheckCSourceRuns: Check if the given C source code compiles and runs" should imply linking and 
> executing the software.

Yes, and it *does* imply that.

The problem is that it doesn't let you cleanly specify which linker flags to use when doing the linking.

I think the underlying problem here is that CMake treats *compiler* flags as first-class citizens but somewhat 
neglected *linker* flags.

At minimum, CHECK_C_SOURCE_RUNS should have a CMAKE_REQUIRED_LDFLAGS variable, which is a string of *linker* command 
line flags, and should do whatever is appropriate to pass those flags to the linker.  If the linker is run from the 
compiler driver program (cc, gcc, clang, whatever), then it should prepend the "pass this through to the linker" option 
("-Wl," or whatever) and provide that to the compiler during the *link* phase but *not* during the compile phase; if 
it's run directly, it should do whatever is necessary to pass the flag to the linker.
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