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annotate src/fftw-3.3.5/m4/ax_cc_maxopt.m4 @ 73:02caadb7509e

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Rebuild with --disable-stack-protector for mingw32
author Chris Cannam
date Fri, 25 Jan 2019 14:31:07 +0000
parents 2cd0e3b3e1fd
children
rev   line source
Chris@42 1 dnl @synopsis AX_CC_MAXOPT
Chris@42 2 dnl @summary turn on optimization flags for the C compiler
Chris@42 3 dnl @category C
Chris@42 4 dnl
Chris@42 5 dnl Try to turn on "good" C optimization flags for various compilers
Chris@42 6 dnl and architectures, for some definition of "good". (In our case,
Chris@42 7 dnl good for FFTW and hopefully for other scientific codes. Modify
Chris@42 8 dnl as needed.)
Chris@42 9 dnl
Chris@42 10 dnl The user can override the flags by setting the CFLAGS environment
Chris@42 11 dnl variable.
Chris@42 12 dnl
Chris@42 13 dnl Note also that the flags assume that ANSI C aliasing rules are
Chris@42 14 dnl followed by the code (e.g. for gcc's -fstrict-aliasing), and that
Chris@42 15 dnl floating-point computations can be re-ordered as needed.
Chris@42 16 dnl
Chris@42 17 dnl Requires macros: AX_CHECK_COMPILER_FLAGS, AX_COMPILER_VENDOR,
Chris@42 18 dnl
Chris@42 19 dnl @version 2011-06-22
Chris@42 20 dnl @license GPLWithACException
Chris@42 21 dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo.
Chris@42 22 AC_DEFUN([AX_CC_MAXOPT],
Chris@42 23 [
Chris@42 24 AC_REQUIRE([AC_PROG_CC])
Chris@42 25 AC_REQUIRE([AX_COMPILER_VENDOR])
Chris@42 26 AC_REQUIRE([AC_CANONICAL_HOST])
Chris@42 27
Chris@42 28 # Try to determine "good" native compiler flags if none specified via CFLAGS
Chris@42 29 if test "$ac_test_CFLAGS" != "set"; then
Chris@42 30 CFLAGS=""
Chris@42 31 case $ax_cv_c_compiler_vendor in
Chris@42 32 dec) CFLAGS="-newc -w0 -O5 -ansi_alias -ansi_args -fp_reorder -tune host"
Chris@42 33 ;;
Chris@42 34
Chris@42 35 sun) CFLAGS="-native -fast -xO5 -dalign"
Chris@42 36 ;;
Chris@42 37
Chris@42 38 hp) CFLAGS="+Oall +Optrs_ansi +DSnative"
Chris@42 39 ;;
Chris@42 40
Chris@42 41 ibm) xlc_opt="-qarch=auto -qtune=auto"
Chris@42 42 AX_CHECK_COMPILER_FLAGS($xlc_opt,
Chris@42 43 CFLAGS="-O3 -qalias=ansi -w $xlc_opt",
Chris@42 44 [CFLAGS="-O3 -qalias=ansi -w"])
Chris@42 45 ;;
Chris@42 46
Chris@42 47 intel) CFLAGS="-O3"
Chris@42 48 # Intel seems to have changed the spelling of this flag recently
Chris@42 49 icc_ansi_alias="unknown"
Chris@42 50 for flag in -ansi-alias -ansi_alias; do
Chris@42 51 AX_CHECK_COMPILER_FLAGS($flag, [icc_ansi_alias=$flag; break])
Chris@42 52 done
Chris@42 53 if test "x$icc_ansi_alias" != xunknown; then
Chris@42 54 CFLAGS="$CFLAGS $icc_ansi_alias"
Chris@42 55 fi
Chris@42 56 AX_CHECK_COMPILER_FLAGS(-malign-double, CFLAGS="$CFLAGS -malign-double")
Chris@42 57 # We used to check for architecture flags here, e.g. -xHost etc.,
Chris@42 58 # but these flags are problematic. On icc-12.0.0, "-mavx -xHost"
Chris@42 59 # overrides -mavx with -xHost, generating SSE2 code instead of AVX
Chris@42 60 # code. ICC does not seem to support -mtune=host or equivalent
Chris@42 61 # non-ABI changing flag.
Chris@42 62 ;;
Chris@42 63
Chris@42 64 clang)
Chris@42 65 CFLAGS="-O3 -fomit-frame-pointer"
Chris@42 66 AX_CHECK_COMPILER_FLAGS(-mtune=native, CFLAGS="$CFLAGS -mtune=native")
Chris@42 67 AX_CHECK_COMPILER_FLAGS(-fstrict-aliasing,CFLAGS="$CFLAGS -fstrict-aliasing")
Chris@42 68 AX_CHECK_COMPILER_FLAGS(-ffast-math, CFLAGS="$CFLAGS -ffast-math")
Chris@42 69 ;;
Chris@42 70
Chris@42 71 gnu)
Chris@42 72 # Default optimization flags for gcc on all systems.
Chris@42 73 # Somehow -O3 does not imply -fomit-frame-pointer on ia32
Chris@42 74 CFLAGS="-O3 -fomit-frame-pointer"
Chris@42 75
Chris@42 76 # tune for the host by default
Chris@42 77 AX_CHECK_COMPILER_FLAGS(-mtune=native, CFLAGS="$CFLAGS -mtune=native")
Chris@42 78
Chris@42 79 # -malign-double for x86 systems
Chris@42 80 AX_CHECK_COMPILER_FLAGS(-malign-double, CFLAGS="$CFLAGS -malign-double")
Chris@42 81
Chris@42 82 # -fstrict-aliasing for gcc-2.95+
Chris@42 83 AX_CHECK_COMPILER_FLAGS(-fstrict-aliasing,
Chris@42 84 CFLAGS="$CFLAGS -fstrict-aliasing")
Chris@42 85
Chris@42 86 # -fno-schedule-insns is pretty much required on all risc
Chris@42 87 # processors.
Chris@42 88 #
Chris@42 89 # gcc performs one pass of instruction scheduling, then a pass of
Chris@42 90 # register allocation, then another pass of instruction
Chris@42 91 # scheduling. The first pass reorders instructions in a way that
Chris@42 92 # is pretty much the worst possible for the purposes of register
Chris@42 93 # allocation. We disable the first pass.
Chris@42 94 AX_CHECK_COMPILER_FLAGS(-fno-schedule-insns, CFLAGS="$CFLAGS -fno-schedule-insns")
Chris@42 95
Chris@42 96 # note that we enable "unsafe" fp optimization with other compilers, too
Chris@42 97 AX_CHECK_COMPILER_FLAGS(-ffast-math, CFLAGS="$CFLAGS -ffast-math")
Chris@42 98
Chris@42 99 # flags to enable power ISA 2.07 instructions with gcc (always true with vsx)
Chris@42 100 if test "$have_vsx" = "yes"; then
Chris@42 101 AX_CHECK_COMPILER_FLAGS(-mcpu=power8, CFLAGS="$CFLAGS -mcpu=power8")
Chris@42 102 AX_CHECK_COMPILER_FLAGS(-mpower8-fusion, CFLAGS="$CFLAGS -mpower8-fusion")
Chris@42 103 AX_CHECK_COMPILER_FLAGS(-mpower8-vector, CFLAGS="$CFLAGS -mpower8-vector")
Chris@42 104 AX_CHECK_COMPILER_FLAGS(-mdirect-move, CFLAGS="$CFLAGS -mdirect-move")
Chris@42 105 fi
Chris@42 106 ;;
Chris@42 107 esac
Chris@42 108
Chris@42 109 if test -z "$CFLAGS"; then
Chris@42 110 echo ""
Chris@42 111 echo "********************************************************"
Chris@42 112 echo "* WARNING: Don't know the best CFLAGS for this system *"
Chris@42 113 echo "* Use ./configure CFLAGS=... to specify your own flags *"
Chris@42 114 echo "* (otherwise, a default of CFLAGS=-O3 will be used) *"
Chris@42 115 echo "********************************************************"
Chris@42 116 echo ""
Chris@42 117 CFLAGS="-O3"
Chris@42 118 fi
Chris@42 119
Chris@42 120 AX_CHECK_COMPILER_FLAGS($CFLAGS, [], [
Chris@42 121 echo ""
Chris@42 122 echo "********************************************************"
Chris@42 123 echo "* WARNING: The guessed CFLAGS don't seem to work with *"
Chris@42 124 echo "* your compiler. *"
Chris@42 125 echo "* Use ./configure CFLAGS=... to specify your own flags *"
Chris@42 126 echo "********************************************************"
Chris@42 127 echo ""
Chris@42 128 CFLAGS=""
Chris@42 129 ])
Chris@42 130
Chris@42 131 fi
Chris@42 132 ])