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Detect Clang compiler compiler.

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Autoconf detects the Clang compiler as GNU GCC (clang sets defines like
__GNUC__ etc) but Clang is *not* completely compatible. We detect Clang
and set ac_vc_c_compiler_gnu to 'no'.

Closes: https://github.com/erikd/libsndfile/issues/49
This commit is contained in:
Erik de Castro Lopo 2013-11-01 15:58:40 +11:00
parent 99985f4c62
commit d7cc3dd0a4
3 changed files with 72 additions and 3 deletions
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31
M4/clang.m4 Normal file
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@ -0,0 +1,31 @@
dnl @synopsis MN_C_COMPILER_IS_CLANG
dnl
dnl Find out if a compiler claiming to be gcc really is gcc (fuck you clang).
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([MN_C_COMPILER_IS_CLANG],
[AC_CACHE_CHECK(whether we are using the CLANG C compiler,
mn_cv_c_compiler_clang,
[ AC_LANG_ASSERT(C)
AC_TRY_LINK([
#include <stdio.h>
],
[
#ifndef __clang__
This is not clang!
#endif
],
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no])
])
)
])

33
M4/really_gcc.m4 Normal file
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@ -0,0 +1,33 @@
dnl @synopsis MN_GCC_REALLY_IS_GCC
dnl
dnl Find out if a compiler claiming to be gcc really is gcc (fuck you clang).
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
# If the configure script has already detected GNU GCC, then make sure it
# isn't CLANG masquerading as GCC.
AC_DEFUN([MN_GCC_REALLY_IS_GCC],
[ AC_LANG_ASSERT(C)
if test "x$ac_cv_c_compiler_gnu" = "xyes" ; then
AC_TRY_LINK([
#include <stdio.h>
],
[
#ifdef __clang__
This is clang!
#endif
],
ac_cv_c_compiler_gnu=yes,
ac_cv_c_compiler_gnu=no
)
fi
])

11
configure.ac
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@ -24,6 +24,10 @@ AC_PROG_CC_STDC
AC_USE_SYSTEM_EXTENSIONS
AM_PROG_CC_C_O
AC_PROG_CXX
MN_C_COMPILER_IS_CLANG
MN_GCC_REALLY_IS_GCC
AC_PROG_SED
# Do not check for F77.
@ -661,10 +665,11 @@ if test -z "$PKG_CONFIG" ; then
echo
fi
echo " Tools :"
echo
echo " Compiler is GCC : ..................... ${ac_cv_c_compiler_gnu}"
if test x$ac_cv_c_compiler_gnu = xyes ; then
echo " Tools :"
echo
echo " Compiler is GCC : ..................... ${ac_cv_c_compiler_gnu}"
echo " GCC version : ......................... ${GCC_VERSION}"
if test $GCC_MAJOR_VERSION -lt 3 ; then
echo "\n"