-dnl $Id: aclocal.m4,v 1.71 2001/04/20 10:56:12 michaelw Exp $
+dnl $Id: aclocal.m4,v 1.90 2001/12/13 09:23:23 sof Exp $
dnl
dnl Extra autoconf macros for the Glasgow fptools
dnl
#include <unistd.h>
#endif
#include <regex.h>
-],[ struct re_pattern_buffer patbuf; re_compile_pattern("",0,&patbuf); ],
+],[ struct re_pattern_buffer patbuf;
+ re_compile_pattern("",0,&patbuf);
+ re_search_2 (&patbuf, "", 0, "",0, 0,0,0,0); ],
fptools_cv_have_regex=yes, fptools_cv_have_regex=no)])
if test "$fptools_cv_have_regex" = yes; then
HaveRegex=YES
if test -d $srcdir/happy; then
SrcTreeHappyCmd=$hardtop/happy/src/happy-inplace
fi
-AC_PATH_PROG(HappyCmd,happy,$SrcTreeHappyCmd)
+if test x"$UseSrcTreeHappy" = xYES; then
+ HappyCmd=$SrcTreeHappyCmd
+else
+ AC_PATH_PROG(HappyCmd,happy,$SrcTreeHappyCmd)
+fi
AC_CACHE_CHECK([for version of happy], fptools_cv_happy_version,
changequote(, )dnl
[if test x"$HappyCmd" = x"$SrcTreeHappyCmd"; then
fi
HappyVersion=$fptools_cv_happy_version;
AC_SUBST(HappyVersion)
+
+# 1.9 and later is required, assume that we can use
+# the "-agc" options.
+HappyOpts="-agc"
+
+FPTOOLS_PROG_CHECK_VERSION([$fptools_cv_happy_version],-gt,[1.11],
+ [HappyOpts=-agcs])
+
+AC_SUBST(HappyOpts)
])
dnl
])
dnl
+dnl Check whether ld supports -x
+dnl
+AC_DEFUN(FPTOOLS_LD_X,
+[AC_CACHE_CHECK([whether ld understands -x], fptools_cv_ld_x,
+[
+echo 'foo() {}' > conftest.c
+${CC-cc} -c conftest.c
+if ${LdCmd} -r -x -o foo.o conftest.o; then
+ fptools_cv_ld_x=yes
+else
+ fptools_cv_ld_x=no
+fi
+rm -rf conftest.c conftest.o foo.o
+])
+if test "$fptools_cv_ld_x" = yes; then
+ LdXFlag=-x
+else
+ LdXFlag=
+fi
+AC_SUBST(LdXFlag)
+])
+
+dnl
dnl Finding the Right Yacc
dnl
AC_DEFUN(FPTOOLS_PROG_YACCY,
dnl *** Checking for ar and its arguments + whether we need ranlib.
dnl
-dnl ArCmd and RANLIB are AC_SUBST'ed
+dnl ArCmd, ArSupportsInput and RANLIB are AC_SUBST'ed
+dnl On Digital UNIX, we test for the -Z (compress) and
+dnl -input (take list of files from external file) flags.
dnl
AC_DEFUN(FPTOOLS_PROG_AR_AND_RANLIB,
[AC_PATH_PROG(ArCmd,ar)
echo "You don't seem to have ar in your PATH...I have no idea how to make a library"
exit 1;
fi
-if $ArCmd clqs conftest.a >/dev/null 2>/dev/null; then
+if $ArCmd clqsZ conftest.a >/dev/null 2>/dev/null; then
+ ArCmd="$ArCmd clqsZ"
+ NeedRanLib=''
+elif $ArCmd clqs conftest.a >/dev/null 2>/dev/null; then
ArCmd="$ArCmd clqs"
NeedRanLib=''
elif $ArCmd cqs conftest.a >/dev/null 2>/dev/null; then
rm -rf conftest*
test -n "$ArCmd" && test -n "$verbose" && echo " setting ArCmd to $ArCmd"
AC_SUBST(ArCmd)
+if $ArCmd conftest.a -input /dev/null >/dev/null 2>/dev/null; then
+ ArSupportsInput='-input'
+else
+ ArSupportsInput=''
+fi
+rm -rf conftest*
+test -n "$ArSupportsInput" && test -n "$verbose" && echo " setting ArSupportsInput to $ArSupportsInput"
+AC_SUBST(ArSupportsInput)
if test -z "$NeedRanLib"; then
RANLIB=':'
test -n "$verbose" && echo " setting RANLIB to $RANLIB"
fptools_cv_have_gcc='no'
else
changequote(, )dnl
- cmd_string="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [^0-9]*\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/expr 20 \\\< \1 \\\* 10 + \2/g' `"
+ is_gcc_v1="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [^0-9]*\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/expr 2000 \\\>= \1 \\\* 1000 + \2/g' `"
+ is_gcc_v3="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [^0-9]*\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/expr 3000 \\\<= \1 \\\* 1000 + \2/g' `"
changequote([, ])dnl
- if test `eval $cmd_string 2>/dev/null` != "1"; then
- echo ''
- echo "I'm not sure if your version of gcc will work,"
- echo "but it's worth a shot, eh?"
- fi
fptools_cv_have_gcc='yes'
+ if test `eval $is_gcc_v1 2>/dev/null` = "1"; then
+ fptools_cv_have_gcc='no'
+ echo ""
+ echo "your gcc version appears to be ..."
+ $CC --version
+ echo "gcc prior to 2.0 and have never worked with ghc."
+ echo "we recommend 2.95.3, although versions back to 2.7.2 should be ok."
+ AC_MSG_ERROR([gcc 1.X has never been supported])
+ fi
+ if test `eval $is_gcc_v3 2>/dev/null` = "1"; then
+ fptools_cv_have_gcc='no'
+ echo ""
+ echo "your gcc version appears to be ..."
+ $CC --version
+ echo "gcc versions 3.0 and above are not yet supported."
+ echo "we recommend 2.95.3, although versions back to 2.7.2 should be ok."
+ AC_MSG_ERROR([gcc 3.0 and above is not currently supported])
+ fi
fi
])
HaveGcc=`echo $fptools_cv_have_gcc | sed 'y/yesno/YESNO/'`
])
dnl
+dnl Getting at the right version of 'find'
+dnl (i.e., not the MS util on a Win32 box).
+dnl
+AC_DEFUN(FPTOOLS_FIND_FIND,
+[
+AC_PATH_PROG(Find2Cmd, find)
+$Find2Cmd --version > conftest.out 2>&1
+if grep "FIND: Parameter format" conftest.out >/dev/null 2>&1 ; then
+ # Encountered MS' find utility, which is not what we're after.
+ #
+ # HACK - AC_CHECK_PROG is useful here in that does let you reject
+ # an (absolute) entry in the path (Find2Cmd). It is not so useful
+ # in that it doesn't let you (AFAIU) set VARIABLE equal to the
+ # absolute path eventually found. So, hack around this by inspecting
+ # what variables hold the abs. path & use them directly.
+ AC_CHECK_PROG(FindCmd,find,`echo $ac_dir/$ac_word`,find,,$Find2Cmd)
+else
+FindCmd=$Find2Cmd
+AC_SUBST(FindCmd)
+fi
+])
+
+dnl
+dnl FPTOOLS_NOCACHE_CHECK prints a message, then sets the
+dnl values of the second argument to the result of running
+dnl the commands given by the third. It does not cache its
+dnl result, so it is suitable for checks which should be
+dnl run every time.
+dnl
+AC_DEFUN(FPTOOLS_NOCACHE_CHECK,
+[AC_MSG_CHECKING([$1])
+ $3
+ AC_MSG_RESULT([$][$2])
+])
+
+dnl
dnl FPTOOLS_GHC_VERSION(version)
dnl FPTOOLS_GHC_VERSION(major, minor [, patchlevel])
dnl FPTOOLS_GHC_VERSION(version, major, minor, patchlevel)
dnl [original version pinched from c2hs]
dnl
AC_DEFUN(FPTOOLS_GHC_VERSION,
-[define([FPTOOLS_CV_GHC_VERSION], [fptools_cv_ghc_version])dnl
-AC_CACHE_CHECK([version of ghc], FPTOOLS_CV_GHC_VERSION, [dnl
-${WithGhc-ghc} --version > conftestghc 2>&1
+[FPTOOLS_NOCACHE_CHECK([version of ghc], [fptools_version_of_ghc],
+[${WithGhc-ghc} --version > conftestghc 2>&1
cat conftestghc >&AC_FD_CC
-dnl `Useless Use Of cat' award...
-changequote(<<, >>)dnl
- FPTOOLS_CV_GHC_VERSION=`cat conftestghc | sed -n -e 's/, patchlevel *\([0-9]\)/.\1/;s/.* version \([0-9][0-9.]*\).*/\1/p'`
-changequote([, ])dnl
+#Useless Use Of cat award...
+ fptools_version_of_ghc=`cat conftestghc | sed -n -e 's/, patchlevel *\([[0-9]]\)/.\1/;s/.* version \([[0-9]][[0-9.]]*\).*/\1/p'`
rm -fr conftest*
- if test "[$]FPTOOLS_CV_GHC_VERSION" = ""
+ if test "[$]fptools_version_of_ghc" = ""
then
- FPTOOLS_CV_GHC_VERSION='unknown'
- fi])
-changequote(<<, >>)dnl
-FPTOOLS_CV_GHC_VERSION<<_major>>=`echo <<$>>FPTOOLS_CV_GHC_VERSION | sed -e 's/^\([0-9]\).*/\1/'`
-FPTOOLS_CV_GHC_VERSION<<_minor>>=`echo <<$>>FPTOOLS_CV_GHC_VERSION | sed -e 's/^[0-9]\.\([0-9]*\).*/\1/'`
-FPTOOLS_CV_GHC_VERSION<<_pl>>=`echo <<$>>FPTOOLS_CV_GHC_VERSION | sed -n -e 's/^[0-9]\.[0-9]*\.\([0-9]*\)/\1/p'`
-changequote([, ])dnl
-if test "[$]FPTOOLS_CV_GHC_VERSION[_pl]" = ""
+ fptools_version_of_ghc='unknown'
+ fi
+fptools_version_of_ghc[_major]=`echo [$]fptools_version_of_ghc | sed -e 's/^\([[0-9]]\).*/\1/'`
+fptools_version_of_ghc[_minor]=`echo [$]fptools_version_of_ghc | sed -e 's/^[[0-9]]\.\([[0-9]]*\).*/\1/'`
+fptools_version_of_ghc[_pl]=`echo [$]fptools_version_of_ghc | sed -n -e 's/^[[0-9]]\.[[0-9]]*\.\([[0-9]]*\)/\1/p'`
+#
+if test "[$]fptools_version_of_ghc[_pl]" = ""
then
- FPTOOLS_CV_GHC_VERSION[_all]="[$]FPTOOLS_CV_GHC_VERSION[_major].[$]FPTOOLS_CV_GHC_VERSION[_minor]"
- FPTOOLS_CV_GHC_VERSION[_pl]="0"
+ fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor]"
+ fptools_version_of_ghc[_pl]="0"
else
- FPTOOLS_CV_GHC_VERSION[_all]="[$]FPTOOLS_CV_GHC_VERSION[_major].[$]FPTOOLS_CV_GHC_VERSION[_minor].[$]FPTOOLS_CV_GHC_VERSION[_pl]"
+ fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor].[$]fptools_version_of_ghc[_pl]"
fi
+#
ifelse($#, [1], [dnl
-[$1]="[$]FPTOOLS_CV_GHC_VERSION[_all]"
+[$1]="[$]fptools_version_of_ghc[_all]"
], $#, [2], [dnl
-[$1]="[$]FPTOOLS_CV_GHC_VERSION[_major]"
-[$2]="[$]FPTOOLS_CV_GHC_VERSION[_minor]"
+[$1]="[$]fptools_version_of_ghc[_major]"
+[$2]="[$]fptools_version_of_ghc[_minor]"
], $#, [3], [dnl
-[$1]="[$]FPTOOLS_CV_GHC_VERSION[_major]"
-[$2]="[$]FPTOOLS_CV_GHC_VERSION[_minor]"
-[$3]="[$]FPTOOLS_CV_GHC_VERSION[_pl]"
+[$1]="[$]fptools_version_of_ghc[_major]"
+[$2]="[$]fptools_version_of_ghc[_minor]"
+[$3]="[$]fptools_version_of_ghc[_pl]"
], $#, [4], [dnl
-[$1]="[$]FPTOOLS_CV_GHC_VERSION[_all]"
-[$2]="[$]FPTOOLS_CV_GHC_VERSION[_major]"
-[$3]="[$]FPTOOLS_CV_GHC_VERSION[_minor]"
-[$4]="[$]FPTOOLS_CV_GHC_VERSION[_pl]"
-], [AC_MSG_ERROR([wrong number of arguments to [$0]])])dnl
-undefine([FPTOOLS_CV_GHC_VERSION])dnl
+[$1]="[$]fptools_version_of_ghc[_all]"
+[$2]="[$]fptools_version_of_ghc[_major]"
+[$3]="[$]fptools_version_of_ghc[_minor]"
+[$4]="[$]fptools_version_of_ghc[_pl]"
+])
+])
])dnl
}],
eval "$cv_name=`cat conftestval`",
eval "$cv_name=-1",
-ifelse([$2], , , eval "$cv_name=$2"))])dnl
+eval "$cv_name=-1")])dnl
eval "fptools_check_cconst_result=`echo '$'{$cv_name}`"
AC_MSG_RESULT($fptools_check_cconst_result)
AC_DEFINE_UNQUOTED($def_name, $fptools_check_cconst_result)
dnl *** Helper function **
dnl
-AC_DEFUN(FPTOOLS_IN_SCOPE,AC_TRY_LINK([extern char* $1;],[return (int)&$2], $3=yes, $3=no))
+AC_DEFUN(FPTOOLS_IN_SCOPE,
+[AC_TRY_LINK([extern char* $1;],[return (int)&$2], $3=yes, $3=no)
+])
dnl *** What's the end-of-text-section marker called? ***
dnl
-AC_DEFUN(FPTOOLS_END_TEXT_SECTION,
-[AC_MSG_CHECKING([for end of text section marker])
-not_done=1
-for i in data_start _data_start etext _etext __etext; do
- FPTOOLS_IN_SCOPE($i,$i,fptools_end_of_text)
- if test "$fptools_end_of_text" = yes; then
- AC_CACHE_VAL([fptools_cv_end_of_text_decl], AC_DEFINE_UNQUOTED(TEXT_SECTION_END_MARKER_DECL, $i))
- AC_CACHE_VAL([fptools_cv_end_of_text], AC_DEFINE_UNQUOTED(TEXT_SECTION_END_MARKER, $i))
- not_done=0
- break
- fi
-done
-if test "$not_done" = 1; then
-FPTOOLS_IN_SCOPE(etext asm("etext"),etext,fptools_end_of_text);
-if test "$fptools_end_of_text" = yes; then
- AC_CACHE_VAL([fptools_cv_end_of_text], AC_DEFINE_UNQUOTED(TEXT_SECTION_END_MARKER, etext))
- AC_CACHE_VAL([fptools_cv_end_of_text_decl], AC_DEFINE_UNQUOTED(TEXT_SECTION_END_MARKER_DECL, etext asm("etext")))
-else
- AC_DEFINE_UNQUOTED(TEXT_SECTION_END_MARKER_DECL, dunno_what_it_is)
- AC_DEFINE_UNQUOTED(TEXT_SECTION_END_MARKER, dunno_what_it_is)
-fi
-fi
-AC_MSG_RESULT([$]fptools_cv_end_of_text)
-])
-
+AC_DEFUN([FPTOOLS_END_TEXT_SECTION],
+[AC_CACHE_CHECK([for end of text section marker],
+ [fptools_cv_end_of_text],
+ [fptools_cv_end_of_text=""
+ not_done=1
+ for i in data_start _data_start etext _etext __etext; do
+ FPTOOLS_IN_SCOPE($i,$i,fptools_end_of_text)
+ if test "$fptools_end_of_text" = yes; then
+ fptools_cv_end_of_text=$i
+ not_done=0
+ break
+ fi
+ done
+ if test "$not_done" = 1; then
+ FPTOOLS_IN_SCOPE(etext asm("etext"),etext,fptools_end_of_text)
+ if test "$fptools_end_of_text" = yes; then
+ fptools_cv_end_of_text="etext"
+ fi
+ fi])
+ if test -n "$fptools_cv_end_of_text"; then
+ AC_DEFINE_UNQUOTED([TEXT_SECTION_END_MARKER], $fptools_cv_end_of_text)
+ else
+ AC_DEFINE_UNQUOTED([TEXT_SECTION_END_MARKER], dunno_end_of_text)
+ fi
+ AC_CACHE_CHECK([for end of text section marker declaration],
+ [fptools_cv_end_of_text_decl],
+ [fptools_cv_end_of_text_decl=""
+ not_done=1
+ for i in data_start _data_start etext _etext __etext; do
+ FPTOOLS_IN_SCOPE($i,$i,fptools_end_of_text_decl)
+ if test "$fptools_end_of_text_decl" = yes; then
+ fptools_cv_end_of_text_decl=$i
+ not_done=0
+ break
+ fi
+ done
+ if test "$not_done" = 1; then
+ FPTOOLS_IN_SCOPE(etext asm("etext"),etext,fptools_end_of_text_decl)
+ if test "$fptools_end_of_text_decl" = yes; then
+ fptools_cv_end_of_text_decl="etext asm(\"etext\")"
+ fi
+ fi])
+ if test -n "$fptools_cv_end_of_text_decl"; then
+ AC_DEFINE_UNQUOTED([TEXT_SECTION_END_MARKER_DECL], $fptools_cv_end_of_text_decl)
+ else
+ AC_DEFINE_UNQUOTED([TEXT_SECTION_END_MARKER_DECL], dunno_end_of_text_decl)
+ fi
+])
+
dnl *** What's the end-of-data-section marker called? ***
dnl
-AC_DEFUN(FPTOOLS_END_DATA_SECTION,
-[AC_MSG_CHECKING([for end of data section marker])
-not_done=1
-for i in end _end __end; do
- FPTOOLS_IN_SCOPE($i,$i,fptools_end_of_data)
- if test "$fptools_end_of_data" = yes; then
- AC_CACHE_VAL([fptools_cv_end_of_data_decl], [AC_DEFINE_UNQUOTED(DATA_SECTION_END_MARKER_DECL, $i)])
- AC_CACHE_VAL([fptools_cv_end_of_data], [AC_DEFINE_UNQUOTED(DATA_SECTION_END_MARKER, $i)])
- not_done=0
- break
- fi
-done
-if test "$not_done" = 1; then
-FPTOOLS_IN_SCOPE(end asm("end"),end,fptools_end_of_data);
-if test "$fptools_end_of_data" = yes; then
- AC_CACHE_VAL([fptools_cv_end_of_data_decl], [AC_DEFINE_UNQUOTED(DATA_SECTION_END_MARKER_DECL, end asm("end"))])
- AC_CACHE_VAL([fptools_cv_end_of_data], [AC_DEFINE_UNQUOTED(DATA_SECTION_END_MARKER, end)])
-else
- AC_CACHE_VAL([fptools_cv_end_of_data_decl], [AC_DEFINE_UNQUOTED(DATA_SECTION_END_MARKER_DECL, dunno_what_it_is)])
- AC_CACHE_VAL([fptools_cv_end_of_data], [AC_DEFINE_UNQUOTED(DATA_SECTION_END_MARKER, dunno_what_it_is)])
-fi
-fi
-AC_MSG_RESULT([$]fptools_cv_end_of_data)
-])
-
-
+AC_DEFUN([FPTOOLS_END_DATA_SECTION],
+[AC_CACHE_CHECK([for end of data section marker],
+ [fptools_cv_end_of_data],
+ [fptools_cv_end_of_data=""
+ not_done=1
+ for i in end _end __end; do
+ FPTOOLS_IN_SCOPE($i,$i,fptools_end_of_data)
+ if test "$fptools_end_of_data" = yes; then
+ fptools_cv_end_of_data=$i
+ not_done=0
+ break
+ fi
+ done
+ if test "$not_done" = 1; then
+ FPTOOLS_IN_SCOPE(end asm("end"),end,fptools_end_of_data)
+ if test "$fptools_end_of_data" = yes; then
+ fptools_cv_end_of_data="end"
+ fi
+ fi])
+ if test -n "$fptools_cv_end_of_data"; then
+ AC_DEFINE_UNQUOTED([DATA_SECTION_END_MARKER], $fptools_cv_end_of_data)
+ else
+ AC_DEFINE_UNQUOTED([DATA_SECTION_END_MARKER], dunno_end_of_data)
+ fi
+ AC_CACHE_CHECK([for end of data section marker declaration],
+ [fptools_cv_end_of_data_decl],
+ [fptools_cv_end_of_data_decl=""
+ not_done=1
+ for i in end _end __end; do
+ FPTOOLS_IN_SCOPE($i,$i,fptools_end_of_data_decl)
+ if test "$fptools_end_of_data_decl" = yes; then
+ fptools_cv_end_of_data_decl=$i
+ not_done=0
+ break
+ fi
+ done
+ if test "$not_done" = 1; then
+ FPTOOLS_IN_SCOPE(end asm("end"),end,fptools_end_of_data_decl)
+ if test "$fptools_end_of_data_decl" = yes; then
+ fptools_cv_end_of_data_decl="end asm(\"end\")"
+ fi
+ fi])
+ if test -n "$fptools_cv_end_of_data_decl"; then
+ AC_DEFINE_UNQUOTED([DATA_SECTION_END_MARKER_DECL], $fptools_cv_end_of_data_decl)
+ else
+ AC_DEFINE_UNQUOTED([DATA_SECTION_END_MARKER_DECL], dunno_end_of_data_decl)
+ fi
+])
+
dnl Based on AC_TRY_LINK - run iftrue if links cleanly with no warning
dnl check for prototypes
dnl
-AC_DEFUN(AC_C_PROTOTYPES,
+AC_DEFUN([AC_C_PROTOTYPES],
[AC_CACHE_CHECK([prototypes], ac_cv_prototypes,
[AC_TRY_COMPILE([
void foo(int);
ac_cv_prototypes=yes,
ac_cv_prototypes=no)])
if test "$ac_cv_prototypes" = yes; then
-AC_DEFINE(HAVE_PROTOTYPES)
+AC_DEFINE([HAVE_PROTOTYPES])
fi
])
dnl set to a value which is suitable for use in a Makefile (for example,
dnl in make's LOADLIBES macro) provided you AC_SUBST it first.
dnl
-dnl @version 0.01 $Id: aclocal.m4,v 1.71 2001/04/20 10:56:12 michaelw Exp $
dnl @author Matthew D. Langston <langston@SLAC.Stanford.EDU>
# FPTOOLS_CHECK_LIBM - check for math library
[AC_REQUIRE([AC_CANONICAL_HOST])dnl
LIBM=
case "$host" in
-*-*-beos* | *-*-macosx*)
+*-*-beos*)
# These system don't have libm
;;
*-ncr-sysv4.3*)
dnl the version number increases, so you may have to adjust the above
dnl URL accordingly.
dnl
-dnl @version 0.01 $Id: aclocal.m4,v 1.71 2001/04/20 10:56:12 michaelw Exp $
dnl @author Matthew D. Langston <langston@SLAC.Stanford.EDU>
AC_DEFUN(FPTOOLS_HAVE_OPENGL,
])
# LocalWords: fi
+
+dnl
+dnl acspecific.m4's defn of AC_PROG_LEX is a bit too permissive, as it
+dnl defaults to 'lex' if 'flex' isn't found (without checking whether
+dnl 'lex' is actually present along the user's PATH).
+dnl
+AC_DEFUN(AC_PROG_LEX_STRICT,
+[AC_CHECK_PROG(LEX, flex, flex)
+if test -z "$LEX"
+then
+ AC_CHECK_PROG(LEX,lex,lex)
+ test -z "$LEX" && AC_MSG_ERROR(['lex' or 'flex' is required to compile GHC.])
+fi
+])
+
+dnl
+dnl Check to see whether CC (gcc) supports a particular option.
+dnl
+AC_DEFUN(FPTOOLS_CC_FLAG,
+[
+AC_CACHE_CHECK([whether $CC accepts $1], [ac_cv_cc_$2],
+[save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $1"
+ AC_LANG_C
+ AC_TRY_COMPILE(,[int main(){return(0);}],
+ [ac_cv_cc_$2=yes],
+ [ac_cv_cc_$2=no])
+ CFLAGS="$save_CFLAGS"
+])
+if test "$ac_cv_cc_$2"x = "yesx"; then
+ $2=$1;
+else
+ $2="";
+fi;
+])