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aclocal.m4
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aclocal.m4
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dnl Tcl M4 Routines
dnl Find a runnable Tcl
AC_DEFUN([TCLEXT_FIND_TCLSH_PROG], [
AC_CACHE_CHECK([for runnable tclsh], [tcl_cv_tclsh_native_path], [
dnl Try to find a runnable tclsh
if test -z "$TCLCONFIGPATH"; then
TCLCONFIGPATH=/dev/null/null
fi
for try_tclsh in "$TCLSH_NATIVE" "$TCLCONFIGPATH/../bin/tclsh" \
"$TCLCONFIGPATH/../bin/tclsh8.6" \
"$TCLCONFIGPATH/../bin/tclsh8.5" \
"$TCLCONFIGPATH/../bin/tclsh8.4" \
`which tclsh 2>/dev/null` \
`which tclsh8.6 2>/dev/null` \
`which tclsh8.5 2>/dev/null` \
`which tclsh8.4 2>/dev/null` \
tclsh; do
if test -z "$try_tclsh"; then
continue
fi
if test -x "$try_tclsh"; then
if echo 'exit 0' | "$try_tclsh" 2>/dev/null >/dev/null; then
tcl_cv_tclsh_native_path="$try_tclsh"
break
fi
fi
done
if test "$TCLCONFIGPATH" = '/dev/null/null'; then
unset TCLCONFIGPATH
fi
])
TCLSH_PROG="${tcl_cv_tclsh_native_path}"
AC_SUBST(TCLSH_PROG)
])
dnl Must call AC_CANONICAL_HOST before calling us
AC_DEFUN([TCLEXT_FIND_TCLCONFIG], [
TCLCONFIGPATH=""
AC_ARG_WITH([tcl], AS_HELP_STRING([--with-tcl], [directory containing tcl configuration (tclConfig.sh)]), [
if test "x$withval" = "xno"; then
AC_MSG_ERROR([cant build without tcl])
fi
TCLCONFIGPATH="$withval"
], [
if test "$cross_compiling" = 'no'; then
TCLEXT_FIND_TCLSH_PROG
tclConfigCheckDir0="`echo 'puts [[tcl::pkgconfig get libdir,runtime]]' | "$TCLSH_PROG" 2>/dev/null`"
tclConfigCheckDir1="`echo 'puts [[tcl::pkgconfig get scriptdir,runtime]]' | "$TCLSH_PROG" 2>/dev/null`"
else
tclConfigCheckDir0=/dev/null/null
tclConfigCheckDir1=/dev/null/null
fi
if test "$cross_compiling" = 'no'; then
dirs="/usr/$host_alias/lib /usr/lib /usr/lib64 /usr/local/lib /usr/local/lib64"
else
dirs=''
fi
for dir in "$tclConfigCheckDir0" "$tclConfigCheckDir1" $dirs; do
if test -f "$dir/tclConfig.sh"; then
TCLCONFIGPATH="$dir"
break
fi
done
])
AC_MSG_CHECKING([for path to tclConfig.sh])
if test -z "$TCLCONFIGPATH"; then
AC_MSG_ERROR([unable to locate tclConfig.sh. Try --with-tcl.])
fi
AC_SUBST(TCLCONFIGPATH)
AC_MSG_RESULT([$TCLCONFIGPATH])
dnl Find Tcl if we haven't already
if test -z "$TCLSH_PROG"; then
TCLEXT_FIND_TCLSH_PROG
fi
])
dnl Must define TCLCONFIGPATH before calling us (i.e., by TCLEXT_FIND_TCLCONFIG)
AC_DEFUN([TCLEXT_LOAD_TCLCONFIG], [
AC_MSG_CHECKING([for working tclConfig.sh])
if test -f "$TCLCONFIGPATH/tclConfig.sh"; then
. "$TCLCONFIGPATH/tclConfig.sh"
else
AC_MSG_ERROR([unable to load tclConfig.sh])
fi
AC_MSG_RESULT([found])
])
AC_DEFUN([TCLEXT_INIT], [
AC_CANONICAL_HOST
TCLEXT_FIND_TCLCONFIG
TCLEXT_LOAD_TCLCONFIG
AC_DEFINE_UNQUOTED([MODULE_SCOPE], [static], [Define how to declare a function should only be visible to the current module])
TCLEXT_BUILD='shared'
AC_ARG_ENABLE([shared], AS_HELP_STRING([--disable-shared], [disable the shared build (same as --enable-static)]), [
if test "$enableval" = "no"; then
TCLEXT_BUILD='static'
TCL_SUPPORTS_STUBS=0
fi
])
AC_ARG_ENABLE([static], AS_HELP_STRING([--enable-static], [enable a static build]), [
if test "$enableval" = "yes"; then
TCLEXT_BUILD='static'
TCL_SUPPORTS_STUBS=0
fi
])
AC_ARG_ENABLE([stubs], AS_HELP_STRING([--disable-stubs], [disable use of Tcl stubs]), [
if test "$enableval" = "no"; then
TCL_SUPPORTS_STUBS=0
else
TCL_SUPPORTS_STUBS=1
fi
])
if test "$TCL_SUPPORTS_STUBS" = "1"; then
AC_DEFINE([USE_TCL_STUBS], [1], [Define if you are using the Tcl Stubs Mechanism])
TCL_STUB_LIB_SPEC="`eval echo "${TCL_STUB_LIB_SPEC}"`"
LIBS="${LIBS} ${TCL_STUB_LIB_SPEC}"
else
TCL_LIB_SPEC="`eval echo "${TCL_LIB_SPEC}"`"
LIBS="${LIBS} ${TCL_LIB_SPEC}"
fi
TCL_INCLUDE_SPEC="`eval echo "${TCL_INCLUDE_SPEC}"`"
CFLAGS="${CFLAGS} ${TCL_INCLUDE_SPEC}"
CPPFLAGS="${CPPFLAGS} ${TCL_INCLUDE_SPEC}"
TCL_DEFS_TCL_ONLY=`(
eval "set -- ${TCL_DEFS}"
for flag in "[$]@"; do
case "${flag}" in
-DTCL_*)
echo "${flag}" | sed "s/'/'\\''/g" | sed "s@^@'@;s@"'[$]'"@'@" | tr $'\n' ' '
;;
esac
done
)`
TCL_DEFS="${TCL_DEFS_TCL_ONLY}"
AC_SUBST(TCL_DEFS)
dnl Needed for package installation
if test "$prefix" = 'NONE' -a "$exec_prefix" = 'NONE' -a "${libdir}" = '${exec_prefix}/lib'; then
TCL_PACKAGE_PATH="`echo "${TCL_PACKAGE_PATH}" | sed 's@ *$''@@' | awk '{ print [$]1 }'`"
else
TCL_PACKAGE_PATH='${libdir}'
fi
AC_SUBST(TCL_PACKAGE_PATH)
AC_SUBST(LIBS)
])
dnl Usage:
dnl DC_TEST_SHOBJFLAGS(shobjflags, shobjldflags, action-if-not-found)
dnl
AC_DEFUN([DC_TEST_SHOBJFLAGS], [
AC_SUBST(SHOBJFLAGS)
AC_SUBST(SHOBJCPPFLAGS)
AC_SUBST(SHOBJLDFLAGS)
OLD_LDFLAGS="$LDFLAGS"
OLD_CFLAGS="$CFLAGS"
OLD_CPPFLAGS="$CPPFLAGS"
SHOBJFLAGS=""
SHOBJCPPFLAGS=""
SHOBJLDFLAGS=""
CFLAGS="$OLD_CFLAGS $1"
CPPFLAGS="$OLD_CPPFLAGS $2"
LDFLAGS="$OLD_LDFLAGS $3"
AC_TRY_LINK([#include <stdio.h>
int unrestst(void);], [ printf("okay\n"); unrestst(); return(0); ], [ SHOBJFLAGS="$1"; SHOBJCPPFLAGS="$2"; SHOBJLDFLAGS="$3" ], [
LDFLAGS="$OLD_LDFLAGS"
CFLAGS="$OLD_CFLAGS"
CPPFLAGS="$OLD_CPPFLAGS"
$4
])
LDFLAGS="$OLD_LDFLAGS"
CFLAGS="$OLD_CFLAGS"
CPPFLAGS="$OLD_CPPFLAGS"
])
AC_DEFUN([DC_GET_SHOBJFLAGS], [
AC_SUBST(SHOBJFLAGS)
AC_SUBST(SHOBJCPPFLAGS)
AC_SUBST(SHOBJLDFLAGS)
DC_CHK_OS_INFO
AC_MSG_CHECKING(how to create shared objects)
if test -z "$SHOBJFLAGS" -a -z "$SHOBJLDFLAGS" -a -z "$SHOBJCPPFLAGS"; then
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-shared], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-shared -mimpure-text], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-shared -rdynamic -Wl,-G,-z,textoff], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-shared -Wl,-G], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-shared -dynamiclib -flat_namespace -undefined suppress -bind_at_load], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-dynamiclib -flat_namespace -undefined suppress -bind_at_load], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-Wl,-dynamiclib -Wl,-flat_namespace -Wl,-undefined,suppress -Wl,-bind_at_load], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-dynamiclib -flat_namespace -undefined suppress], [
DC_TEST_SHOBJFLAGS([-fPIC], [-DPIC], [-dynamiclib], [
AC_MSG_RESULT(cant)
AC_MSG_ERROR([We are unable to make shared objects.])
])
])
])
])
])
])
])
])
])
fi
AC_MSG_RESULT($SHOBJCPPFLAGS $SHOBJFLAGS $SHOBJLDFLAGS)
DC_SYNC_SHLIBOBJS
])
AC_DEFUN([DC_SYNC_SHLIBOBJS], [
AC_SUBST(SHLIBOBJS)
SHLIBOBJS=""
for obj in $LIB@&t@OBJS; do
SHLIBOBJS="$SHLIBOBJS `echo $obj | sed 's/\.o$/_shr.o/g'`"
done
])
AC_DEFUN([DC_SYNC_RPATH], [
AC_ARG_ENABLE([rpath], AS_HELP_STRING([--disable-rpath], [disable setting of rpath]), [
if test "$enableval" = 'no'; then
set_rpath='no'
else
set_rpath='yes'
fi
], [
if test "$cross_compiling" = 'yes'; then
set_rpath='no'
else
ifelse($1, [], [
set_rpath='yes'
], [
set_rpath='$1'
])
fi
])
if test "$set_rpath" = 'yes'; then
OLD_LDFLAGS="$LDFLAGS"
AC_CACHE_CHECK([how to set rpath], [rsk_cv_link_set_rpath], [
AC_LANG_PUSH(C)
for tryrpath in "-Wl,-rpath" "-Wl,--rpath" "-Wl,-R"; do
LDFLAGS="$OLD_LDFLAGS $tryrpath -Wl,/tmp"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [ return(0); ])], [
rsk_cv_link_set_rpath="$tryrpath"
break
])
done
AC_LANG_POP(C)
unset tryrpath
])
LDFLAGS="$OLD_LDFLAGS"
unset OLD_LDFLAGS
if test -n "$rsk_cv_link_set_rpath"; then
ADDLDFLAGS=""
for opt in $LDFLAGS $LIBS; do
if echo "$opt" | grep '^-L' >/dev/null; then
rpathdir="`echo "$opt" | sed 's@^-L *@@'`"
ADDLDFLAGS="$ADDLDFLAGS $rsk_cv_link_set_rpath -Wl,$rpathdir"
fi
done
unset opt
LDFLAGS="$LDFLAGS $ADDLDFLAGS"
unset ADDLDFLAGS
fi
fi
])
AC_DEFUN([DC_CHK_OS_INFO], [
AC_CANONICAL_HOST
AC_SUBST(SHOBJEXT)
AC_SUBST(SHOBJFLAGS)
AC_SUBST(SHOBJCPPFLAGS)
AC_SUBST(SHOBJLDFLAGS)
AC_SUBST(CFLAGS)
AC_SUBST(CPPFLAGS)
AC_SUBST(AREXT)
if test "$dc_cv_dc_chk_os_info_called" != '1'; then
dc_cv_dc_chk_os_info_called='1'
AC_MSG_CHECKING(host operating system)
AC_MSG_RESULT($host_os)
SHOBJEXT="so"
AREXT="a"
case $host_os in
darwin*)
SHOBJEXT="dylib"
;;
hpux*)
case "$host_cpu" in
ia64)
SHOBJEXT="so"
;;
*)
SHOBJEXT="sl"
;;
esac
;;
mingw32|mingw32msvc*)
SHOBJEXT="dll"
CFLAGS="$CFLAGS -mms-bitfields"
CPPFLAGS="$CPPFLAGS -mms-bitfields"
SHOBJCPPFLAGS="-DPIC"
SHOBJLDFLAGS='-shared -Wl,--dll -Wl,--enable-auto-image-base -Wl,--output-def,$[@].def,--out-implib,$[@].a'
;;
msvc)
SHOBJEXT="dll"
AREXT='lib'
CFLAGS="$CFLAGS -nologo"
SHOBJCPPFLAGS='-DPIC'
SHOBJLDFLAGS='/LD /LINK /NODEFAULTLIB:MSVCRT'
;;
cygwin*)
SHOBJEXT="dll"
SHOBJFLAGS="-fPIC"
SHOBJCPPFLAGS="-DPIC"
CFLAGS="$CFLAGS -mms-bitfields"
CPPFLAGS="$CPPFLAGS -mms-bitfields"
SHOBJLDFLAGS='-shared -Wl,--enable-auto-image-base -Wl,--output-def,$[@].def,--out-implib,$[@].a'
;;
esac
fi
])
AC_DEFUN([SHOBJ_SET_SONAME], [
SAVE_LDFLAGS="$LDFLAGS"
AC_MSG_CHECKING([how to specify soname])
for try in "-Wl,--soname,$1" "Wl,-install_name,$1" '__fail__'; do
LDFLAGS="$SAVE_LDFLAGS"
if test "${try}" = '__fail__'; then
AC_MSG_RESULT([can't])
break
fi
LDFLAGS="${LDFLAGS} ${try}"
AC_TRY_LINK([void TestTest(void) { return; }], [], [
LDFLAGS="${SAVE_LDFLAGS}"
SHOBJLDFLAGS="${SHOBJLDFLAGS} ${try}"
AC_MSG_RESULT([$try])
break
])
done
AC_SUBST(SHOBJLDFLAGS)
])
dnl $1 = Description to show user
dnl $2 = Libraries to link to
dnl $3 = Variable to update (optional; default LIBS)
dnl $4 = Action to run if found
dnl $5 = Action to run if not found
AC_DEFUN([SHOBJ_DO_STATIC_LINK_LIB], [
ifelse($3, [], [
define([VAR_TO_UPDATE], [LIBS])
], [
define([VAR_TO_UPDATE], [$3])
])
AC_MSG_CHECKING([for how to statically link to $1])
trylink_ADD_LDFLAGS=''
for arg in $VAR_TO_UPDATE; do
case "${arg}" in
-L*)
trylink_ADD_LDFLAGS="${arg}"
;;
esac
done
SAVELIBS="$LIBS"
staticlib=""
found="0"
dnl HP/UX uses -Wl,-a,archive ... -Wl,-a,shared_archive
dnl Linux and Solaris us -Wl,-Bstatic ... -Wl,-Bdynamic
AC_LANG_PUSH([C])
for trylink in "-Wl,-a,archive $2 -Wl,-a,shared_archive" "-Wl,-Bstatic $2 -Wl,-Bdynamic" "$2"; do
if echo " ${LDFLAGS} " | grep ' -static ' >/dev/null; then
if test "${trylink}" != "$2"; then
continue
fi
fi
LIBS="${SAVELIBS} ${trylink_ADD_LDFLAGS} ${trylink}"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
staticlib="${trylink}"
found="1"
break
])
done
AC_LANG_POP([C])
LIBS="${SAVELIBS}"
if test "${found}" = "1"; then
new_RESULT=''
SAVERESULT="$VAR_TO_UPDATE"
for lib in ${SAVERESULT}; do
addlib='1'
for removelib in $2; do
if test "${lib}" = "${removelib}"; then
addlib='0'
break
fi
done
if test "$addlib" = '1'; then
new_RESULT="${new_RESULT} ${lib}"
fi
done
VAR_TO_UPDATE="${new_RESULT} ${staticlib}"
AC_MSG_RESULT([${staticlib}])
$4
else
AC_MSG_RESULT([cant])
$5
fi
])
AC_DEFUN([DC_SETUP_STABLE_API], [
VERSIONSCRIPT="$1"
SYMFILE="$2"
DC_FIND_STRIP_AND_REMOVESYMS([$SYMFILE])
DC_SETVERSIONSCRIPT([$VERSIONSCRIPT], [$SYMFILE])
])
AC_DEFUN([DC_SETVERSIONSCRIPT], [
VERSIONSCRIPT="$1"
SYMFILE="$2"
TMPSYMFILE="${SYMFILE}.tmp"
TMPVERSIONSCRIPT="${VERSIONSCRIPT}.tmp"
echo "${SYMPREFIX}Test_Symbol" > "${TMPSYMFILE}"
echo '{' > "${TMPVERSIONSCRIPT}"
echo ' local:' >> "${TMPVERSIONSCRIPT}"
echo " ${SYMPREFIX}Test_Symbol;" >> "${TMPVERSIONSCRIPT}"
echo '};' >> "${TMPVERSIONSCRIPT}"
SAVE_LDFLAGS="${LDFLAGS}"
AC_MSG_CHECKING([for how to set version script])
for tryaddldflags in "-Wl,--version-script,${TMPVERSIONSCRIPT}" "-Wl,-exported_symbols_list,${TMPSYMFILE}"; do
LDFLAGS="${SAVE_LDFLAGS} ${tryaddldflags}"
AC_TRY_LINK([void Test_Symbol(void) { return; }], [], [
addldflags="`echo "${tryaddldflags}" | sed 's/\.tmp$//'`"
break
])
done
rm -f "${TMPSYMFILE}"
rm -f "${TMPVERSIONSCRIPT}"
LDFLAGS="${SAVE_LDFLAGS}"
if test -n "${addldflags}"; then
SHOBJLDFLAGS="${SHOBJLDFLAGS} ${addldflags}"
AC_MSG_RESULT($addldflags)
else
AC_MSG_RESULT([don't know])
fi
AC_SUBST(SHOBJLDFLAGS)
])
AC_DEFUN([DC_FIND_STRIP_AND_REMOVESYMS], [
SYMFILE="$1"
dnl Determine how to strip executables
AC_CHECK_TOOLS(OBJCOPY, objcopy gobjcopy, [false])
AC_CHECK_TOOLS(STRIP, strip gstrip, [false])
if test "x${STRIP}" = "xfalse"; then
STRIP="${OBJCOPY}"
fi
WEAKENSYMS='true'
REMOVESYMS='true'
SYMPREFIX=''
case $host_os in
darwin*)
SYMPREFIX="_"
REMOVESYMS="${STRIP} -u -x"
;;
*)
if test "x${OBJCOPY}" != "xfalse"; then
WEAKENSYMS="${OBJCOPY} --keep-global-symbols=${SYMFILE}"
REMOVESYMS="${OBJCOPY} --discard-all"
elif test "x${STRIP}" != "xfalse"; then
REMOVESYMS="${STRIP} -x"
fi
;;
esac
AC_SUBST(WEAKENSYMS)
AC_SUBST(REMOVESYMS)
AC_SUBST(SYMPREFIX)
])
# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
# Check whether the given FLAG works with the current language's compiler
# or gives an error. (Warnings, however, are ignored)
#
# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
# success/failure.
#
# If EXTRA-FLAGS is defined, it is added to the current language's default
# flags (e.g. CFLAGS) when the check is done. The check is thus made with
# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
# force the compiler to issue an error when a bad flag is given.
#
# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
#
# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <[email protected]>
# Copyright (c) 2011 Maarten Bosmans <[email protected]>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 6
AC_DEFUN([AX_CHECK_COMPILE_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])])
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
AS_VAR_IF(CACHEVAR,yes,
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_COMPILE_FLAGS
# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
# Check whether the given FLAG works with the linker or gives an error.
# (Warnings, however, are ignored)
#
# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
# success/failure.
#
# If EXTRA-FLAGS is defined, it is added to the linker's default flags
# when the check is done. The check is thus made with the flags: "LDFLAGS
# EXTRA-FLAGS FLAG". This can for example be used to force the linker to
# issue an error when a bad flag is given.
#
# INPUT gives an alternative input source to AC_LINK_IFELSE.
#
# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
# macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <[email protected]>
# Copyright (c) 2011 Maarten Bosmans <[email protected]>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 6
AC_DEFUN([AX_CHECK_LINK_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
ax_check_save_flags=$LDFLAGS
LDFLAGS="$LDFLAGS $4 $1"
AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])])
LDFLAGS=$ax_check_save_flags])
AS_VAR_IF(CACHEVAR,yes,
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_LINK_FLAGS