kc3-lang/libffi/m4/ax_cc_maxopt.m4
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Hash : 5865450d
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Date : 2021-03-23T19:50:09
Update ax_cc_maxopt m4 macro (#617) Keeps libffi's specific changes (https://github.com/libffi/libffi/commit/cec3a3a201f17a7f018f25e1a0917bd5206e5a5a#diff-2396a1256ac4b1c6849c931ddb8018bdd984bb2383be21bb819a33b95d8d603f) and updates to the latest ax_cc_maxopt.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=commit;h=73ee1b396c21062ee8eeb8721ba5323322110fb5): ax_cc_maxopt.m4: retain setting of CFLAGS by configure AX_CC_MAXOPT checks whether CFLAGS was set by the user; if so, the user’s setting is respected. This behavior is retained, of course. However, AX_CC_MAXOPT was then setting CFLAGS="". This overrode the default setting by configure, which usually includes -g. Hence, if CFLAGS was not set by the user, retain the default setting, to preserve the ability to debug. A typical default setting from configure is "-g -O2". This means that AX_CC_MAXOPT might typically set CFLAGS to "-g -O2 -O3". This is fine, because the later -O3 will override the earlier -O2. (The only assumption is that all compilers that AX_CC_MAXOPT knows behave in this sane way.)
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m4/ax_cc_maxopt.m4
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# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cc_maxopt.html # =========================================================================== # # SYNOPSIS # # AX_CC_MAXOPT # # DESCRIPTION # # Try to turn on "good" C optimization flags for various compilers and # architectures, for some definition of "good". (In our case, good for # FFTW and hopefully for other scientific codes. Modify as needed.) # # The user can override the flags by setting the CFLAGS environment # variable. The user can also specify --enable-portable-binary in order to # disable any optimization flags that might result in a binary that only # runs on the host architecture. # # Note also that the flags assume that ANSI C aliasing rules are followed # by the code (e.g. for gcc's -fstrict-aliasing), and that floating-point # computations can be re-ordered as needed. # # Requires macros: AX_CHECK_COMPILE_FLAG, AX_COMPILER_VENDOR, # AX_GCC_ARCHFLAG, AX_GCC_X86_CPUID. # # LICENSE # # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> # Copyright (c) 2008 Matteo Frigo # # This program is free software: you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the # Free Software Foundation, either version 3 of the License, or (at your # option) any later version. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General # Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program. If not, see <https://www.gnu.org/licenses/>. # # As a special exception, the respective Autoconf Macro's copyright owner # gives unlimited permission to copy, distribute and modify the configure # scripts that are the output of Autoconf when processing the Macro. You # need not follow the terms of the GNU General Public License when using # or distributing such scripts, even though portions of the text of the # Macro appear in them. The GNU General Public License (GPL) does govern # all other use of the material that constitutes the Autoconf Macro. # # This special exception to the GPL applies to versions of the Autoconf # Macro released by the Autoconf Archive. When you make and distribute a # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. #serial 18 AC_DEFUN([AX_CC_MAXOPT], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AX_COMPILER_VENDOR]) AC_REQUIRE([AC_CANONICAL_HOST]) AC_ARG_ENABLE(portable-binary, [AS_HELP_STRING([--enable-portable-binary], [disable compiler optimizations that would produce unportable binaries])], acx_maxopt_portable=$enableval, acx_maxopt_portable=no) # Try to determine "good" native compiler flags if none specified via CFLAGS if test "$ac_test_CFLAGS" != "set"; then case $ax_cv_c_compiler_vendor in dec) CFLAGS="$CFLAGS -newc -w0 -O5 -ansi_alias -ansi_args -fp_reorder -tune host" if test "x$acx_maxopt_portable" = xno; then CFLAGS="$CFLAGS -arch host" fi;; sun) CFLAGS="$CFLAGS -native -fast -xO5 -dalign" if test "x$acx_maxopt_portable" = xyes; then CFLAGS="$CFLAGS -xarch=generic" fi;; hp) CFLAGS="$CFLAGS +Oall +Optrs_ansi +DSnative" if test "x$acx_maxopt_portable" = xyes; then CFLAGS="$CFLAGS +DAportable" fi;; ibm) if test "x$acx_maxopt_portable" = xno; then xlc_opt="-qarch=auto -qtune=auto" else xlc_opt="-qtune=auto" fi AX_CHECK_COMPILE_FLAG($xlc_opt, CFLAGS="$CFLAGS -O3 -qansialias -w $xlc_opt", [CFLAGS="$CFLAGS -O3 -qansialias -w" echo "******************************************************" echo "* You seem to have the IBM C compiler. It is *" echo "* recommended for best performance that you use: *" echo "* *" echo "* CFLAGS=-O3 -qarch=xxx -qtune=xxx -qansialias -w *" echo "* ^^^ ^^^ *" echo "* where xxx is pwr2, pwr3, 604, or whatever kind of *" echo "* CPU you have. (Set the CFLAGS environment var. *" echo "* and re-run configure.) For more info, man cc. *" echo "******************************************************"]) ;; intel) CFLAGS="$CFLAGS -O3 -ansi_alias" if test "x$acx_maxopt_portable" = xno; then icc_archflag=unknown icc_flags="" case $host_cpu in i686*|x86_64*) # icc accepts gcc assembly syntax, so these should work: AX_GCC_X86_CPUID(0) AX_GCC_X86_CPUID(1) case $ax_cv_gcc_x86_cpuid_0 in # see AX_GCC_ARCHFLAG *:756e6547:6c65746e:49656e69) # Intel case $ax_cv_gcc_x86_cpuid_1 in *0?6[[78ab]]?:*:*:*|?6[[78ab]]?:*:*:*|6[[78ab]]?:*:*:*) icc_flags="-xK" ;; *0?6[[9d]]?:*:*:*|?6[[9d]]?:*:*:*|6[[9d]]?:*:*:*|*1?65?:*:*:*) icc_flags="-xSSE2 -xB -xK" ;; *0?6e?:*:*:*|?6e?:*:*:*|6e?:*:*:*) icc_flags="-xSSE3 -xP -xO -xB -xK" ;; *0?6f?:*:*:*|?6f?:*:*:*|6f?:*:*:*|*1?66?:*:*:*) icc_flags="-xSSSE3 -xT -xB -xK" ;; *1?6[[7d]]?:*:*:*) icc_flags="-xSSE4.1 -xS -xT -xB -xK" ;; *1?6[[aef]]?:*:*:*|*2?6[[5cef]]?:*:*:*) icc_flags="-xSSE4.2 -xS -xT -xB -xK" ;; *2?6[[ad]]?:*:*:*) icc_flags="-xAVX -SSE4.2 -xS -xT -xB -xK" ;; *3?6[[ae]]?:*:*:*) icc_flags="-xCORE-AVX-I -xAVX -SSE4.2 -xS -xT -xB -xK" ;; *3?6[[cf]]?:*:*:*|*4?6[[56]]?:*:*:*) icc_flags="-xCORE-AVX2 -xCORE-AVX-I -xAVX -SSE4.2 -xS -xT -xB -xK" ;; *000?f[[346]]?:*:*:*|?f[[346]]?:*:*:*|f[[346]]?:*:*:*) icc_flags="-xSSE3 -xP -xO -xN -xW -xK" ;; *00??f??:*:*:*|??f??:*:*:*|?f??:*:*:*|f??:*:*:*) icc_flags="-xSSE2 -xN -xW -xK" ;; esac ;; esac ;; esac if test "x$icc_flags" != x; then for flag in $icc_flags; do AX_CHECK_COMPILE_FLAG($flag, [icc_archflag=$flag; break]) done fi AC_MSG_CHECKING([for icc architecture flag]) AC_MSG_RESULT($icc_archflag) if test "x$icc_archflag" != xunknown; then CFLAGS="$CFLAGS $icc_archflag" fi fi ;; gnu) # default optimization flags for gcc on all systems CFLAGS="$CFLAGS -O3 -fomit-frame-pointer" # -malign-double for x86 systems # libffi local change -- don't align double, as it changes the ABI # AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double") # -fstrict-aliasing for gcc-2.95+ AX_CHECK_COMPILE_FLAG(-fstrict-aliasing, CFLAGS="$CFLAGS -fstrict-aliasing") # note that we enable "unsafe" fp optimization with other compilers, too AX_CHECK_COMPILE_FLAG(-ffast-math, CFLAGS="$CFLAGS -ffast-math") AX_GCC_ARCHFLAG($acx_maxopt_portable) ;; microsoft) # default optimization flags for MSVC opt builds CFLAGS="$CFLAGS -O2" ;; esac if test -z "$CFLAGS"; then echo "" echo "********************************************************" echo "* WARNING: Don't know the best CFLAGS for this system *" echo "* Use ./configure CFLAGS=... to specify your own flags *" echo "* (otherwise, a default of CFLAGS=-O3 will be used) *" echo "********************************************************" echo "" CFLAGS="$CFLAGS -O3" fi AX_CHECK_COMPILE_FLAG($CFLAGS, [], [ echo "" echo "********************************************************" echo "* WARNING: The guessed CFLAGS don't seem to work with *" echo "* your compiler. *" echo "* Use ./configure CFLAGS=... to specify your own flags *" echo "********************************************************" echo "" ]) fi ])