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 < $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 # include 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 ])