public software.stuff

dnl

dnl                             acx_prog_cc_optim.m4

dnl

dnl Enable a reasonable set of optimization flags for the C compiler.

dnl

dnl %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

dnl

dnl     This file part of:      AstrOmatic software

dnl

dnl     Copyright:              (C) 2002-2010 Emmanuel Bertin -- IAP/CNRS/UPMC

dnl                             (C) 2002 Ville Lauriki (original version)

dnl

dnl     Licenses:               GPL (this version)

dnl                             MIT AllPermissive (original script)

dnl

dnl     AstrOmatic software is free software: you can redistribute it and/or

dnl     modify it under the terms of the GNU General Public License as

dnl     published by the Free Software Foundation, either version 3 of the

dnl     License, or (at your option) any later version.

dnl     AstrOmatic software is distributed in the hope that it will be useful,

dnl     but WITHOUT ANY WARRANTY; without even the implied warranty of

dnl     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

dnl     GNU General Public License for more details.

dnl     You should have received a copy of the GNU General Public License

dnl     along with AstrOmatic software.

dnl     If not, see <http://www.gnu.org/licenses/>.

dnl

dnl     Last modified:          09/10/2010

dnl

dnl %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

dnl

dnl @synopsis ACX_PROG_CC_OPTIM

dnl

dnl Currently this macro knows about GCC, Solaris C compiler,

dnl Digital Unix C compiler, C for AIX Compiler, HP-UX C compiler,

dnl IRIX C compiler, NEC SX-5 (Super-UX 10) C compiler, and Cray J90

dnl (Unicos 10.0.0.8) C compiler.

dnl

dnl This macro is a modification of Ville Laurikari's VL_PROG_CC_WARNINGS

dnl

AC_DEFUN([ACX_PROG_CC_OPTIM], [

  msg="for C compiler optimization flags"

  AC_CACHE_CHECK($msg, prog_cc_optim_cv_flags, [

    if test -n "$CC"; then

      cat > conftest.c <<EOF

int main(int argc, char **argv) { return 0; }

EOF

      dnl Most compilers print some kind of a version string with some command

      dnl line options (often "-V").  The version string should be checked

      dnl before doing a test compilation run with compiler-specific flags.

      dnl This is because some compilers (like the Cray compiler) only

      dnl produce a warning message for unknown flags instead of returning

      dnl an error, resulting in a false positive.  Also, compilers may do

      dnl erratic things when invoked with flags meant for a different

      dnl compiler.

      dnl INTEL C 64bits compiler

      if $CC -V 2>&1 | grep -i "Intel(R) 64" > /dev/null 2>&1 &&

           $CC -c -O conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-O3 -axSSE3,SSE4.1,SSE4.2,AVX -no-prec-div -unroll"

        prog_ld_optim_cv_flags="-static-intel"

      dnl INTEL C 32bits compiler

      elif $CC -V 2>&1 | grep -i "Intel(R)" > /dev/null 2>&1 &&

           $CC -c -O conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-O3 -axSSE2,SSE3,SSE4.1,SSE4.2,AVX -no-prec-div -unroll"

        prog_ld_optim_cv_flags="-static-intel"

      dnl GCC

      elif test "$GCC" = "yes"; then

        prog_cc_optim_cv_flags="-O3 -g -funroll-loops -fomit-frame-pointer -Wall"

        prog_ld_optim_cv_flags=""

      dnl Solaris C compiler

      elif $CC -V 2>&1 | grep -i "WorkShop" > /dev/null 2>&1 &&

           $CC -c -O conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-O"

        prog_ld_optim_cv_flags=""

      dnl Digital Unix/Compaq C compiler

      elif ($CC -V 2>&1 | grep -i "Digital UNIX Compiler"> /dev/null 2>&1 ||

           $CC -V 2>&1 | grep -i "Compaq C"> /dev/null 2>&1) &&

           $CC -c -fast conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-fast -tune host"

        prog_ld_optim_cv_flags=""

      dnl C for AIX Compiler

      elif $CC 2>&1 | grep -i "C for AIX Compiler" > /dev/null 2>&1 &&

           $CC -c -qinfo=all -O2 conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-O2"

        prog_ld_optim_cv_flags=""

      dnl IRIX C compiler

      elif $CC -version 2>&1 | grep -i "MIPSpro Compilers" > /dev/null 2>&1 &&

           $CC -c -fullwarn -O3 conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-O3"

        prog_ld_optim_cv_flags=""

      dnl HP-UX C compiler

      elif what $CC 2>&1 | grep -i "HP C Compiler" > /dev/null 2>&1 &&

           $CC -c -Aa +O3 conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="+O3"

        prog_ld_optim_cv_flags=""

      dnl The NEC SX-5 (Super-UX 10) C compiler

      elif $CC -V 2>&1 | grep "/SX" > /dev/null 2>&1 &&

           $CC -c -Xc -O conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-O"

        prog_ld_optim_cv_flags=""

      dnl The Cray C compiler (Unicos)

      elif $CC -V 2>&1 | grep -i "Cray" > /dev/null 2>&1 &&

           $CC -c -h conform -O3 conftest.c > /dev/null 2>&1 &&

           test -f conftest.o; then

        prog_cc_optim_cv_flags="-O3"

        prog_ld_optim_cv_flags=""

      fi

      rm -f conftest.*

    fi

    if test -n "$prog_cc_optim_cv_flags"; then

      AM_CFLAGS="$CFLAGS $prog_cc_optim_cv_flags"

      AM_LDFLAGS="$LDFLAGS $prog_ld_optim_cv_flags"

    else

      prog_cc_optim_cv_flags=""

      prog_ld_optim_cv_flags=""

    fi

  ])

])dnl