AC_DEFUN(ACX_CHECK_CC_FLAGS,
[
AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK(whether ${CC-cc} accepts $1, ac_$2,
[echo 'void f(){}' > conftest.c
if test -z "`${CC-cc} $1 -c conftest.c 2>&1`"; then
ac_$2=yes
else
ac_$2=no
fi
rm -f conftest*
])
if test "$ac_$2" = yes; then
:
$3
else
:
$4
fi
])
AC_DEFUN(ACX_PROG_GCC_VERSION,
[
AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK(whether we are using gcc $1.$2 or later, ac_cv_prog_gcc_$1_$2,
[
dnl The semicolon after "yes" below is to pacify NeXT's syntax-checking cpp.
cat > conftest.c <<EOF
#ifdef __GNUC__
# if (__GNUC__ > $1) || (__GNUC__ == $1 && __GNUC_MINOR__ >= $2)
yes;
# endif
#endif
EOF
if AC_TRY_COMMAND(${CC-cc} -E conftest.c) | egrep yes >/dev/null 2>&1; then
ac_cv_prog_gcc_$1_$2=yes
else
ac_cv_prog_gcc_$1_$2=no
fi
])
if test "$ac_cv_prog_gcc_$1_$2" = yes; then
:
$3
else
:
$4
fi
])
AC_DEFUN(ACX_PROG_CC_EGCS,
[ACX_PROG_GCC_VERSION(2,90,acx_prog_egcs=yes,acx_prog_egcs=no)])
# Check to see if we are using a version of gcc that aligns the stack
# (true in gcc-2.95+, which have the -mpreferred-stack-boundary flag).
# Also check for stack alignment bug in gcc-2.95.x
# (see http://egcs.cygnus.com/ml/gcc-bugs/1999-11/msg00259.html), and
# whether main() is correctly aligned by the OS/libc/loader.
AC_DEFUN(ACX_GCC_ALIGNS_STACK,
[
AC_REQUIRE([AC_PROG_CC])
acx_gcc_aligns_stack=no
if test "$GCC" = "yes"; then
ACX_CHECK_CC_FLAGS(-mpreferred-stack-boundary=4, m_pref_stack_boundary_4)
if test "$ac_m_pref_stack_boundary_4" = "yes"; then
AC_MSG_CHECKING([whether the stack is correctly aligned by gcc])
save_CFLAGS="$CFLAGS"
CFLAGS="-O -malign-double"
AC_TRY_RUN([#include <stdlib.h>
# include <stdio.h>
struct yuck { int blechh; };
int one(void) { return 1; }
struct yuck ick(void) { struct yuck y; y.blechh = 3; return y; }
# define CHK_ALIGN(x) if ((((long) &(x)) & 0x7)) { fprintf(stderr, "bad alignment of " #x "\n"); exit(1); }
void blah(int foo) { double foobar; CHK_ALIGN(foobar); }
int main(void) { double ok1; struct yuck y; double ok2; CHK_ALIGN(ok1);
CHK_ALIGN(ok2); y = ick(); blah(one()); return 0; }
], [acx_gcc_aligns_stack=yes; acx_gcc_stack_align_bug=no],
acx_gcc_stack_align_bug=yes, acx_gcc_stack_align_bug=yes)
CFLAGS="$save_CFLAGS"
AC_MSG_RESULT($acx_gcc_aligns_stack)
fi
fi
if test "$acx_gcc_aligns_stack" = yes; then
:
$1
else
:
$2
fi
])
AC_DEFUN(ACX_PROG_CC_MAXOPT,
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([ACX_PROG_CC_EGCS])
AC_REQUIRE([AC_CANONICAL_HOST])
# Try to determine "good" native compiler flags if none specified on command
# line
if test "$ac_test_CFLAGS" != "set"; then
CFLAGS=""
case "${host_cpu}-${host_os}" in
*linux*)
echo "*******************************************************"
echo "* Congratulations! You are running linux. *"
echo "*******************************************************"
;;
sparc-solaris2*) if test "$CC" = cc; then
CFLAGS="-native -fast -xO5 -dalign"
fi;;
alpha*-osf*) if test "$CC" = cc; then
CFLAGS="-newc -w0 -O5 -ansi_alias -ansi_args -fp_reorder -tune host -arch host -std1"
fi;;
hppa*-hpux*) if test "$CC" = cc; then
CFLAGS="-Ae +O3 +Oall"
fi;;
*-aix*)
if test "$CC" = cc -o "$CC" = xlc; then
ACX_CHECK_CC_FLAGS([-qarch=auto -qtune=auto], qarch_auto,
[CFLAGS="-O3 -qansialias -w -qarch=auto -qtune=auto"],
[CFLAGS="-O3 -qansialias -w"
echo "*******************************************************"
echo "* You seem to have AIX and the IBM 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 "*******************************************************"
])
fi;;
esac
# use default flags for gcc on all systems
if test $ac_cv_prog_gcc = yes; then
CFLAGS="-O3 -fomit-frame-pointer"
fi
# the egcs scheduler is too smart and destroys our own schedule.
# Disable the first instruction scheduling pass. The second
# scheduling pass (after register reload) is ok.
if test "$acx_prog_egcs" = yes; then
CFLAGS="$CFLAGS -fno-schedule-insns -fschedule-insns2"
fi
# test for gcc-specific flags:
if test $ac_cv_prog_gcc = yes; then
# -malign-double for x86 systems
ACX_CHECK_CC_FLAGS(-malign-double,align_double,
CFLAGS="$CFLAGS -malign-double")
# -fstrict-aliasing for gcc-2.95+
ACX_CHECK_CC_FLAGS(-fstrict-aliasing,fstrict_aliasing,
CFLAGS="$CFLAGS -fstrict-aliasing")
fi
CPU_FLAGS=""
if test "$GCC" = "yes"; then
dnl try to guess correct CPU flags, at least for linux
case "${host_cpu}" in
i586*) ACX_CHECK_CC_FLAGS(-mcpu=pentium,cpu_pentium,
[CPU_FLAGS=-mcpu=pentium],
[ACX_CHECK_CC_FLAGS(-mpentium,pentium,
[CPU_FLAGS=-mpentium])])
;;
i686*) ACX_CHECK_CC_FLAGS(-mcpu=pentiumpro,cpu_pentiumpro,
[CPU_FLAGS=-mcpu=pentiumpro],
[ACX_CHECK_CC_FLAGS(-mpentiumpro,pentiumpro,
[CPU_FLAGS=-mpentiumpro])])
;;
alphaev4-*) ACX_CHECK_CC_FLAGS(-mcpu=ev4,cpu_ev4,
[CPU_FLAGS=-mcpu=ev4])
;;
alphaev56-*) ACX_CHECK_CC_FLAGS(-mcpu=ev56,cpu_ev56,
[CPU_FLAGS=-mcpu=ev56])
;;
alphaev5-*) ACX_CHECK_CC_FLAGS(-mcpu=ev5,cpu_ev5,
[CPU_FLAGS=-mcpu=ev5])
;;
alphaev6-*) ACX_CHECK_CC_FLAGS(-mcpu=ev6,cpu_ev6,
[CPU_FLAGS=-mcpu=ev6])
;;
powerpc*)
cputype=`(grep cpu /proc/cpuinfo | head -1 | cut -d: -f2 | sed 's/ //g') 2> /dev/null`
is60x=`echo $cputype | egrep "^60[0-9]e?$"`
if test -n "$is60x"; then
ACX_CHECK_CC_FLAGS(-mcpu=$cputype,m_cpu_60x,
CPU_FLAGS=-mcpu=$cputype)
elif test "$cputype" = 750; then
ACX_PROG_GCC_VERSION(2,95,
ACX_CHECK_CC_FLAGS(-mcpu=750,m_cpu_750,
CPU_FLAGS=-mcpu=750))
fi
if test -z "$CPU_FLAGS"; then
ACX_CHECK_CC_FLAGS(-mcpu=powerpc,m_cpu_powerpc,
CPU_FLAGS=-mcpu=powerpc)
fi
if test -z "$CPU_FLAGS"; then
ACX_CHECK_CC_FLAGS(-mpowerpc,m_powerpc,
CPU_FLAGS=-mpowerpc)
fi
esac
fi
if test -n "$CPU_FLAGS"; then
CFLAGS="$CFLAGS $CPU_FLAGS"
fi
if test -z "$CFLAGS"; then
echo ""
echo "********************************************************"
echo "* WARNING: Don't know the best CFLAGS for this system *"
echo "* Use make CFLAGS=..., or edit the top level Makefile *"
echo "* (otherwise, a default of CFLAGS=-O3 will be used) *"
echo "********************************************************"
echo ""
CFLAGS="-O3"
fi
ACX_CHECK_CC_FLAGS(${CFLAGS}, guessed_cflags, , [
echo ""
echo "********************************************************"
echo "* WARNING: The guessed CFLAGS don't seem to work with *"
echo "* your compiler. *"
echo "* Use make CFLAGS=..., or edit the top level Makefile *"
echo "********************************************************"
echo ""
CFLAGS=""
])
fi
])
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