Re: master 13c8cc58bb: Enable warnings when building as a developer with

[Po Lu]

Richard Stallman <rms@gnu.org> writes:

> Is there a way to distinguish Clang from GCC by running shell commands?
> Autoconf could use that to provide a way to distinguish them.

Yes, in fact we already do that in Emacs:

  # clang is unduly picky about some things.
  AC_CACHE_CHECK([whether the compiler is clang], [emacs_cv_clang],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM([[
            #ifndef __clang__
              error "not clang";
            #endif
          ]])],
       [emacs_cv_clang=yes],
       [emacs_cv_clang=no])])