[Bug target/40411] -std=c99 does not enable c99 mode in Solaris C library

[norm.jacobs at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40411

Norm Jacobs <norm.jacobs at oracle dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |norm.jacobs at oracle dot com

--- Comment #29 from Norm Jacobs <norm.jacobs at oracle dot com> ---
Created attachment 38948
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38948&action=edit
proposed fix to link values-*.o

Unfortunately, due to the way support for behavioral differences in conflicting
standards interfaces is implemented in Solaris libc and libm, there really
isn't a perfect answer here.  An offline discussion of this led to the
conclusion that "the application dictates the xpg'ness and any library that
thinks it has control from the compilation options it uses, is fooling itself."

The current builds of GCC that are delivered with Solaris 11 and later include
a patch very similar to the one that I have attached.  The one that I have
attached should only link in appropriate values-*.o files when GCC calls the
linker to generate an executable program.  This seems consistent with what the
Studio compilers do.