Re: What is the value of TARGET_C99_FUNCTIONS on Darwin?

[dominiq at lps dot ens dot fr (Dominique Dhumieres)]

Eric,

Thanks for the explanations.

> The idea, I believe, is that the default will be the system that you
> are currently on.

It would be nice, but it is not the way it seems to work (at least for gcc,
for g++ and gfortran it may, but I am not sure).  For instance
I have a version of 4.3.0 on 10.4. Without -mmacosx-version-min=10.4
I get 

[pbook] test/tests% gcc-4 failure_v2.c
failure_v2.c: In function 'main':
failure_v2.c:15: sorry, unimplemented: no way to expand a call to 'cexpi'

i.e. __builtin_cexpi does not exist, with the option the program compiles.
So it seems to work.

On 10.3.9 I get:

/sw/lib/odcctools/bin/ld: warning unknown -macosx_version_min parameter value: 10.3.9 ignored (using 10.1)

with Apple Computer, Inc. version odcctools-590.36od13.

Is there a way to set -mmacosx-version-min when building gcc, g++, gfortran, ...?
If these compilers are build with the default setting (10.1?) do they obey the
-macosx_version_min if, for instance, cexpi fallback to cexp?

These questions are motivated by PR31249 in which I report that
optimizing the computation of cos(x) and sin(x) by cexpi(x)
gives worse results on OSX.

Dominique