Re: cmake giving options the compiler does not understand

[Jeff Morriss <jeff.morriss.ws () gmail com>]

On 01/02/14 17:15, Guy Harris wrote:
> On Jan 2, 2014, at 1:55 PM, Jeff Morriss <jeff.morriss.ws () gmail com> wrote:
>
> > On 01/02/14 16:34, Alexis La Goutte wrote:
> > > Hi Jeff,
> > >
> > > I have also some time the some error message...
> >
> > Only sometimes?  I had to take that option out of CMakeLists.txt to get it compile.
> >
> > > With autotools, -Wshorten-64-to-32 is limited to only C...
> >
> > True but my problem is with C compiler (it doesn't get past compiling the first file).
>
> I infer from the "cc" in
>
>         cc: error: unrecognized command line option -Wshorten-64-to-32
>
> that this is UN*X (or Windows with MinGW or Cygwin or something such as that).
>
> If it's UN*X, presumably you can try autotools; with autotools, does
> the compiler detect that the compiler doesn't support
> -Wshorten-64-to-32?

Oh, sorry, yes, it works with autotools.  That's what I normally use 
and, well, I would have fixed it or complained long ago if it didn't 
work ;-).

> checking whether we can add -Wshorten-64-to-32 to CFLAGS... no

> If not, the test needs more work in autotools, and those changes
> might also apply to CMake; if so, this is an issue with the CMake
> tests for "does this flag work"?

Cmake has that function which I listed that is supposed to do it for us 
but it doesn't seem to work (at least for me or at least not all the time).

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