2012-02-26 22:41:44 +11:00
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dnl @synopsis XIPH_GCC_VERSION
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dnl
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dnl Find the version of gcc.
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dnl @version 1.0 Nov 05 2007
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2013-03-10 12:30:49 +11:00
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dnl @version 1.1 Mar 10 2013
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2012-02-26 22:41:44 +11:00
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dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
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dnl
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dnl Permission to use, copy, modify, distribute, and sell this file for any
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dnl purpose is hereby granted without fee, provided that the above copyright
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dnl and this permission notice appear in all copies. No representations are
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dnl made about the suitability of this software for any purpose. It is
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dnl provided "as is" without express or implied warranty.
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dnl
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AC_DEFUN([XIPH_GCC_VERSION],
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[
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if test "x$ac_cv_c_compiler_gnu" = "xyes" ; then
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AC_MSG_CHECKING([for version of $CC])
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GCC_VERSION=`$CC -dumpversion`
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AC_MSG_RESULT($GCC_VERSION)
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2013-03-10 12:30:49 +11:00
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GCC_MAJOR_VERSION=`echo $GCC_VERSION | cut -d. -f 1`
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GCC_MINOR_VERSION=`echo $GCC_VERSION | cut -d. -f 2`
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configure.ac: allow several compiler flags for clang
The flac configury marked clang as 'not being gcc' and excluded
a lot of compiler switches, most importantly the visibility flags,
from being used with it. This was done possibly after a problem
reported at: https://github.com/erikd/libsndfile/issues/49 .
This patch does the following:
- m4/gcc_version.m4 (XIPH_GCC_VERSION): set GCC_MAJOR_VERSION and
GCC_MINOR_VERSION to 0 for non-gcc. Previously, they were left
unset.
- configure: the gcc version checks are, naturally, against non-
zero values, so, allow many compiler switches to be used with
clang without affecting real-gcc cases.
- configure: When setting CFLAGS="-O3 -funroll-loops", also set
CXXFLAGS="-O3". Prevents g++ warnings with _FORTIFY_SOURCE, i.e.:
'_FORTIFY_SOURCE requires compiling with optimization (-O)'
Tested compilation using gcc-7.3.1 and clang-5.0.2 on x86_64-linux,
and gcc-4.4.7 and clang-3.4.2 on an i686-linux. Also tested cross-
compiling for Mac OS X using clang-5.0.2.
2019-10-08 20:25:55 +03:00
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else
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GCC_MAJOR_VERSION=0
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GCC_MINOR_VERSION=0
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2012-02-26 22:41:44 +11:00
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fi
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AC_SUBST(GCC_VERSION)
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AC_SUBST(GCC_MAJOR_VERSION)
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AC_SUBST(GCC_MINOR_VERSION)
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])# XIPH_GCC_VERSION
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