ungccify parts of the build
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Anthony Green
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m4/ax_cc_maxopt.m4
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m4/ax_cc_maxopt.m4
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_cc_maxopt.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CC_MAXOPT
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#
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# DESCRIPTION
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#
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# Try to turn on "good" C optimization flags for various compilers and
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# architectures, for some definition of "good". (In our case, good for
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# FFTW and hopefully for other scientific codes. Modify as needed.)
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#
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# The user can override the flags by setting the CFLAGS environment
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# variable. The user can also specify --enable-portable-binary in order to
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# disable any optimization flags that might result in a binary that only
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# runs on the host architecture.
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#
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# Note also that the flags assume that ANSI C aliasing rules are followed
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# by the code (e.g. for gcc's -fstrict-aliasing), and that floating-point
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# computations can be re-ordered as needed.
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#
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# Requires macros: AX_CHECK_COMPILER_FLAGS, AX_COMPILER_VENDOR,
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# AX_GCC_ARCHFLAG, AX_GCC_X86_CPUID.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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# Copyright (c) 2008 Matteo Frigo
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 11
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AC_DEFUN([AX_CC_MAXOPT],
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AX_COMPILER_VENDOR])
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_ARG_ENABLE(portable-binary, [AS_HELP_STRING([--enable-portable-binary], [disable compiler optimizations that would produce unportable binaries])],
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acx_maxopt_portable=$withval, acx_maxopt_portable=no)
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# Try to determine "good" native compiler flags if none specified via CFLAGS
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if test "$ac_test_CFLAGS" != "set"; then
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CFLAGS=""
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case $ax_cv_c_compiler_vendor in
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dec) CFLAGS="-newc -w0 -O5 -ansi_alias -ansi_args -fp_reorder -tune host"
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if test "x$acx_maxopt_portable" = xno; then
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CFLAGS="$CFLAGS -arch host"
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fi;;
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sun) CFLAGS="-native -fast -xO5 -dalign"
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if test "x$acx_maxopt_portable" = xyes; then
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CFLAGS="$CFLAGS -xarch=generic"
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fi;;
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hp) CFLAGS="+Oall +Optrs_ansi +DSnative"
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if test "x$acx_maxopt_portable" = xyes; then
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CFLAGS="$CFLAGS +DAportable"
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fi;;
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ibm) if test "x$acx_maxopt_portable" = xno; then
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xlc_opt="-qarch=auto -qtune=auto"
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else
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xlc_opt="-qtune=auto"
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fi
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AX_CHECK_COMPILER_FLAGS($xlc_opt,
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CFLAGS="-O3 -qansialias -w $xlc_opt",
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[CFLAGS="-O3 -qansialias -w"
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echo "******************************************************"
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echo "* You seem to have the IBM C compiler. It is *"
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echo "* recommended for best performance that you use: *"
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echo "* *"
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echo "* CFLAGS=-O3 -qarch=xxx -qtune=xxx -qansialias -w *"
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echo "* ^^^ ^^^ *"
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echo "* where xxx is pwr2, pwr3, 604, or whatever kind of *"
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echo "* CPU you have. (Set the CFLAGS environment var. *"
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echo "* and re-run configure.) For more info, man cc. *"
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echo "******************************************************"])
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;;
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intel) CFLAGS="-O3 -ansi_alias"
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if test "x$acx_maxopt_portable" = xno; then
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icc_archflag=unknown
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icc_flags=""
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case $host_cpu in
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i686*|x86_64*)
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# icc accepts gcc assembly syntax, so these should work:
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AX_GCC_X86_CPUID(0)
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AX_GCC_X86_CPUID(1)
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case $ax_cv_gcc_x86_cpuid_0 in # see AX_GCC_ARCHFLAG
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*:756e6547:*:*) # Intel
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case $ax_cv_gcc_x86_cpuid_1 in
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*6a?:*[[234]]:*:*|*6[[789b]]?:*:*:*) icc_flags="-xK";;
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*f3[[347]]:*:*:*|*f4[1347]:*:*:*) icc_flags="-xP -xN -xW -xK";;
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*f??:*:*:*) icc_flags="-xN -xW -xK";;
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esac ;;
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esac ;;
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esac
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if test "x$icc_flags" != x; then
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for flag in $icc_flags; do
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AX_CHECK_COMPILER_FLAGS($flag, [icc_archflag=$flag; break])
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done
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fi
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AC_MSG_CHECKING([for icc architecture flag])
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AC_MSG_RESULT($icc_archflag)
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if test "x$icc_archflag" != xunknown; then
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CFLAGS="$CFLAGS $icc_archflag"
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fi
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fi
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;;
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gnu)
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# default optimization flags for gcc on all systems
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CFLAGS="-O3 -fomit-frame-pointer"
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# -malign-double for x86 systems
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AX_CHECK_COMPILER_FLAGS(-malign-double, CFLAGS="$CFLAGS -malign-double")
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# -fstrict-aliasing for gcc-2.95+
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AX_CHECK_COMPILER_FLAGS(-fstrict-aliasing,
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CFLAGS="$CFLAGS -fstrict-aliasing")
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# note that we enable "unsafe" fp optimization with other compilers, too
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AX_CHECK_COMPILER_FLAGS(-ffast-math, CFLAGS="$CFLAGS -ffast-math")
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AX_GCC_ARCHFLAG($acx_maxopt_portable)
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;;
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esac
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if test -z "$CFLAGS"; then
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echo ""
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echo "********************************************************"
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echo "* WARNING: Don't know the best CFLAGS for this system *"
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echo "* Use ./configure CFLAGS=... to specify your own flags *"
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echo "* (otherwise, a default of CFLAGS=-O3 will be used) *"
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echo "********************************************************"
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echo ""
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CFLAGS="-O3"
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fi
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AX_CHECK_COMPILER_FLAGS($CFLAGS, [], [
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echo ""
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echo "********************************************************"
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echo "* WARNING: The guessed CFLAGS don't seem to work with *"
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echo "* your compiler. *"
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echo "* Use ./configure CFLAGS=... to specify your own flags *"
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echo "********************************************************"
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echo ""
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CFLAGS=""
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])
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fi
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])
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