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-rw-r--r--3rdparty/flac/m4/clang.m428
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+dnl @synopsis XIPH_C_COMPILER_IS_CLANG
+dnl
+dnl Find out if a compiler claiming to be gcc really is gcc (clang lies).
+dnl @version 1.0 Oct 31 2013
+dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
+dnl
+dnl Permission to use, copy, modify, distribute, and sell this file for any
+dnl purpose is hereby granted without fee, provided that the above copyright
+dnl and this permission notice appear in all copies. No representations are
+dnl made about the suitability of this software for any purpose. It is
+dnl provided "as is" without express or implied warranty.
+dnl
+
+
+AC_DEFUN([XIPH_C_COMPILER_IS_CLANG],
+[AC_CACHE_CHECK(whether we are using the CLANG C compiler,
+ xiph_cv_c_compiler_clang,
+ [ AC_LANG_ASSERT(C)
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+ #include <stdio.h>
+ ]], [[
+ #ifndef __clang__
+ This is not clang!
+ #endif
+ ]])],[xiph_cv_c_compiler_clang=yes],[xiph_cv_c_compiler_clang=no
+ ])]
+ )]
+)