| # lib-link.m4 serial 7 (gettext-0.15) |
| dnl Copyright (C) 2001-2005 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl From Bruno Haible. |
| |
| AC_PREREQ(2.50) |
| |
| dnl AC_LIB_LINKFLAGS(name [, dependencies]) searches for libname and |
| dnl the libraries corresponding to explicit and implicit dependencies. |
| dnl Sets and AC_SUBSTs the LIB${NAME} and LTLIB${NAME} variables and |
| dnl augments the CPPFLAGS variable. |
| AC_DEFUN([AC_LIB_LINKFLAGS], |
| [ |
| AC_REQUIRE([AC_LIB_PREPARE_PREFIX]) |
| AC_REQUIRE([AC_LIB_RPATH]) |
| define([Name],[translit([$1],[./-], [___])]) |
| define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-], |
| [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])]) |
| AC_CACHE_CHECK([how to link with lib[]$1], [ac_cv_lib[]Name[]_libs], [ |
| AC_LIB_LINKFLAGS_BODY([$1], [$2]) |
| ac_cv_lib[]Name[]_libs="$LIB[]NAME" |
| ac_cv_lib[]Name[]_ltlibs="$LTLIB[]NAME" |
| ac_cv_lib[]Name[]_cppflags="$INC[]NAME" |
| ]) |
| LIB[]NAME="$ac_cv_lib[]Name[]_libs" |
| LTLIB[]NAME="$ac_cv_lib[]Name[]_ltlibs" |
| INC[]NAME="$ac_cv_lib[]Name[]_cppflags" |
| AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME) |
| AC_SUBST([LIB]NAME) |
| AC_SUBST([LTLIB]NAME) |
| dnl Also set HAVE_LIB[]NAME so that AC_LIB_HAVE_LINKFLAGS can reuse the |
| dnl results of this search when this library appears as a dependency. |
| HAVE_LIB[]NAME=yes |
| undefine([Name]) |
| undefine([NAME]) |
| ]) |
| |
| dnl AC_LIB_HAVE_LINKFLAGS(name, dependencies, includes, testcode) |
| dnl searches for libname and the libraries corresponding to explicit and |
| dnl implicit dependencies, together with the specified include files and |
| dnl the ability to compile and link the specified testcode. If found, it |
| dnl sets and AC_SUBSTs HAVE_LIB${NAME}=yes and the LIB${NAME} and |
| dnl LTLIB${NAME} variables and augments the CPPFLAGS variable, and |
| dnl #defines HAVE_LIB${NAME} to 1. Otherwise, it sets and AC_SUBSTs |
| dnl HAVE_LIB${NAME}=no and LIB${NAME} and LTLIB${NAME} to empty. |
| AC_DEFUN([AC_LIB_HAVE_LINKFLAGS], |
| [ |
| AC_REQUIRE([AC_LIB_PREPARE_PREFIX]) |
| AC_REQUIRE([AC_LIB_RPATH]) |
| define([Name],[translit([$1],[./-], [___])]) |
| define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-], |
| [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])]) |
| |
| dnl Search for lib[]Name and define LIB[]NAME, LTLIB[]NAME and INC[]NAME |
| dnl accordingly. |
| AC_LIB_LINKFLAGS_BODY([$1], [$2]) |
| |
| dnl Add $INC[]NAME to CPPFLAGS before performing the following checks, |
| dnl because if the user has installed lib[]Name and not disabled its use |
| dnl via --without-lib[]Name-prefix, he wants to use it. |
| ac_save_CPPFLAGS="$CPPFLAGS" |
| AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME) |
| |
| AC_CACHE_CHECK([for lib[]$1], [ac_cv_lib[]Name], [ |
| ac_save_LIBS="$LIBS" |
| LIBS="$LIBS $LIB[]NAME" |
| AC_TRY_LINK([$3], [$4], [ac_cv_lib[]Name=yes], [ac_cv_lib[]Name=no]) |
| LIBS="$ac_save_LIBS" |
| ]) |
| if test "$ac_cv_lib[]Name" = yes; then |
| HAVE_LIB[]NAME=yes |
| AC_DEFINE([HAVE_LIB]NAME, 1, [Define if you have the $1 library.]) |
| AC_MSG_CHECKING([how to link with lib[]$1]) |
| AC_MSG_RESULT([$LIB[]NAME]) |
| else |
| HAVE_LIB[]NAME=no |
| dnl If $LIB[]NAME didn't lead to a usable library, we don't need |
| dnl $INC[]NAME either. |
| CPPFLAGS="$ac_save_CPPFLAGS" |
| LIB[]NAME= |
| LTLIB[]NAME= |
| fi |
| AC_SUBST([HAVE_LIB]NAME) |
| AC_SUBST([LIB]NAME) |
| AC_SUBST([LTLIB]NAME) |
| undefine([Name]) |
| undefine([NAME]) |
| ]) |
| |
| dnl Determine the platform dependent parameters needed to use rpath: |
| dnl libext, shlibext, hardcode_libdir_flag_spec, hardcode_libdir_separator, |
| dnl hardcode_direct, hardcode_minus_L. |
| AC_DEFUN([AC_LIB_RPATH], |
| [ |
| dnl Tell automake >= 1.10 to complain if config.rpath is missing. |
| m4_ifdef([AC_REQUIRE_AUX_FILE], [AC_REQUIRE_AUX_FILE([config.rpath])]) |
| AC_REQUIRE([AC_PROG_CC]) dnl we use $CC, $GCC, $LDFLAGS |
| AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD, $with_gnu_ld |
| AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host |
| AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir |
| AC_CACHE_CHECK([for shared library run path origin], acl_cv_rpath, [ |
| CC="$CC" GCC="$GCC" LDFLAGS="$LDFLAGS" LD="$LD" with_gnu_ld="$with_gnu_ld" \ |
| ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.rpath" "$host" > conftest.sh |
| . ./conftest.sh |
| rm -f ./conftest.sh |
| acl_cv_rpath=done |
| ]) |
| wl="$acl_cv_wl" |
| libext="$acl_cv_libext" |
| shlibext="$acl_cv_shlibext" |
| hardcode_libdir_flag_spec="$acl_cv_hardcode_libdir_flag_spec" |
| hardcode_libdir_separator="$acl_cv_hardcode_libdir_separator" |
| hardcode_direct="$acl_cv_hardcode_direct" |
| hardcode_minus_L="$acl_cv_hardcode_minus_L" |
| dnl Determine whether the user wants rpath handling at all. |
| AC_ARG_ENABLE(rpath, |
| [ --disable-rpath do not hardcode runtime library paths], |
| :, enable_rpath=yes) |
| ]) |
| |
| dnl AC_LIB_LINKFLAGS_BODY(name [, dependencies]) searches for libname and |
| dnl the libraries corresponding to explicit and implicit dependencies. |
| dnl Sets the LIB${NAME}, LTLIB${NAME} and INC${NAME} variables. |
| AC_DEFUN([AC_LIB_LINKFLAGS_BODY], |
| [ |
| AC_REQUIRE([AC_LIB_PREPARE_MULTILIB]) |
| define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-], |
| [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])]) |
| dnl By default, look in $includedir and $libdir. |
| use_additional=yes |
| AC_LIB_WITH_FINAL_PREFIX([ |
| eval additional_includedir=\"$includedir\" |
| eval additional_libdir=\"$libdir\" |
| ]) |
| AC_LIB_ARG_WITH([lib$1-prefix], |
| [ --with-lib$1-prefix[=DIR] search for lib$1 in DIR/include and DIR/lib |
| --without-lib$1-prefix don't search for lib$1 in includedir and libdir], |
| [ |
| if test "X$withval" = "Xno"; then |
| use_additional=no |
| else |
| if test "X$withval" = "X"; then |
| AC_LIB_WITH_FINAL_PREFIX([ |
| eval additional_includedir=\"$includedir\" |
| eval additional_libdir=\"$libdir\" |
| ]) |
| else |
| additional_includedir="$withval/include" |
| additional_libdir="$withval/$acl_libdirstem" |
| fi |
| fi |
| ]) |
| dnl Search the library and its dependencies in $additional_libdir and |
| dnl $LDFLAGS. Using breadth-first-seach. |
| LIB[]NAME= |
| LTLIB[]NAME= |
| INC[]NAME= |
| rpathdirs= |
| ltrpathdirs= |
| names_already_handled= |
| names_next_round='$1 $2' |
| while test -n "$names_next_round"; do |
| names_this_round="$names_next_round" |
| names_next_round= |
| for name in $names_this_round; do |
| already_handled= |
| for n in $names_already_handled; do |
| if test "$n" = "$name"; then |
| already_handled=yes |
| break |
| fi |
| done |
| if test -z "$already_handled"; then |
| names_already_handled="$names_already_handled $name" |
| dnl See if it was already located by an earlier AC_LIB_LINKFLAGS |
| dnl or AC_LIB_HAVE_LINKFLAGS call. |
| uppername=`echo "$name" | sed -e 'y|abcdefghijklmnopqrstuvwxyz./-|ABCDEFGHIJKLMNOPQRSTUVWXYZ___|'` |
| eval value=\"\$HAVE_LIB$uppername\" |
| if test -n "$value"; then |
| if test "$value" = yes; then |
| eval value=\"\$LIB$uppername\" |
| test -z "$value" || LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$value" |
| eval value=\"\$LTLIB$uppername\" |
| test -z "$value" || LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$value" |
| else |
| dnl An earlier call to AC_LIB_HAVE_LINKFLAGS has determined |
| dnl that this library doesn't exist. So just drop it. |
| : |
| fi |
| else |
| dnl Search the library lib$name in $additional_libdir and $LDFLAGS |
| dnl and the already constructed $LIBNAME/$LTLIBNAME. |
| found_dir= |
| found_la= |
| found_so= |
| found_a= |
| if test $use_additional = yes; then |
| if test -n "$shlibext" && test -f "$additional_libdir/lib$name.$shlibext"; then |
| found_dir="$additional_libdir" |
| found_so="$additional_libdir/lib$name.$shlibext" |
| if test -f "$additional_libdir/lib$name.la"; then |
| found_la="$additional_libdir/lib$name.la" |
| fi |
| else |
| if test -f "$additional_libdir/lib$name.$libext"; then |
| found_dir="$additional_libdir" |
| found_a="$additional_libdir/lib$name.$libext" |
| if test -f "$additional_libdir/lib$name.la"; then |
| found_la="$additional_libdir/lib$name.la" |
| fi |
| fi |
| fi |
| fi |
| if test "X$found_dir" = "X"; then |
| for x in $LDFLAGS $LTLIB[]NAME; do |
| AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) |
| case "$x" in |
| -L*) |
| dir=`echo "X$x" | sed -e 's/^X-L//'` |
| if test -n "$shlibext" && test -f "$dir/lib$name.$shlibext"; then |
| found_dir="$dir" |
| found_so="$dir/lib$name.$shlibext" |
| if test -f "$dir/lib$name.la"; then |
| found_la="$dir/lib$name.la" |
| fi |
| else |
| if test -f "$dir/lib$name.$libext"; then |
| found_dir="$dir" |
| found_a="$dir/lib$name.$libext" |
| if test -f "$dir/lib$name.la"; then |
| found_la="$dir/lib$name.la" |
| fi |
| fi |
| fi |
| ;; |
| esac |
| if test "X$found_dir" != "X"; then |
| break |
| fi |
| done |
| fi |
| if test "X$found_dir" != "X"; then |
| dnl Found the library. |
| LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$found_dir -l$name" |
| if test "X$found_so" != "X"; then |
| dnl Linking with a shared library. We attempt to hardcode its |
| dnl directory into the executable's runpath, unless it's the |
| dnl standard /usr/lib. |
| if test "$enable_rpath" = no || test "X$found_dir" = "X/usr/$acl_libdirstem"; then |
| dnl No hardcoding is needed. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" |
| else |
| dnl Use an explicit option to hardcode DIR into the resulting |
| dnl binary. |
| dnl Potentially add DIR to ltrpathdirs. |
| dnl The ltrpathdirs will be appended to $LTLIBNAME at the end. |
| haveit= |
| for x in $ltrpathdirs; do |
| if test "X$x" = "X$found_dir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| ltrpathdirs="$ltrpathdirs $found_dir" |
| fi |
| dnl The hardcoding into $LIBNAME is system dependent. |
| if test "$hardcode_direct" = yes; then |
| dnl Using DIR/libNAME.so during linking hardcodes DIR into the |
| dnl resulting binary. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" |
| else |
| if test -n "$hardcode_libdir_flag_spec" && test "$hardcode_minus_L" = no; then |
| dnl Use an explicit option to hardcode DIR into the resulting |
| dnl binary. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" |
| dnl Potentially add DIR to rpathdirs. |
| dnl The rpathdirs will be appended to $LIBNAME at the end. |
| haveit= |
| for x in $rpathdirs; do |
| if test "X$x" = "X$found_dir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| rpathdirs="$rpathdirs $found_dir" |
| fi |
| else |
| dnl Rely on "-L$found_dir". |
| dnl But don't add it if it's already contained in the LDFLAGS |
| dnl or the already constructed $LIBNAME |
| haveit= |
| for x in $LDFLAGS $LIB[]NAME; do |
| AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) |
| if test "X$x" = "X-L$found_dir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir" |
| fi |
| if test "$hardcode_minus_L" != no; then |
| dnl FIXME: Not sure whether we should use |
| dnl "-L$found_dir -l$name" or "-L$found_dir $found_so" |
| dnl here. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" |
| else |
| dnl We cannot use $hardcode_runpath_var and LD_RUN_PATH |
| dnl here, because this doesn't fit in flags passed to the |
| dnl compiler. So give up. No hardcoding. This affects only |
| dnl very old systems. |
| dnl FIXME: Not sure whether we should use |
| dnl "-L$found_dir -l$name" or "-L$found_dir $found_so" |
| dnl here. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name" |
| fi |
| fi |
| fi |
| fi |
| else |
| if test "X$found_a" != "X"; then |
| dnl Linking with a static library. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_a" |
| else |
| dnl We shouldn't come here, but anyway it's good to have a |
| dnl fallback. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir -l$name" |
| fi |
| fi |
| dnl Assume the include files are nearby. |
| additional_includedir= |
| case "$found_dir" in |
| */$acl_libdirstem | */$acl_libdirstem/) |
| basedir=`echo "X$found_dir" | sed -e 's,^X,,' -e "s,/$acl_libdirstem/"'*$,,'` |
| additional_includedir="$basedir/include" |
| ;; |
| esac |
| if test "X$additional_includedir" != "X"; then |
| dnl Potentially add $additional_includedir to $INCNAME. |
| dnl But don't add it |
| dnl 1. if it's the standard /usr/include, |
| dnl 2. if it's /usr/local/include and we are using GCC on Linux, |
| dnl 3. if it's already present in $CPPFLAGS or the already |
| dnl constructed $INCNAME, |
| dnl 4. if it doesn't exist as a directory. |
| if test "X$additional_includedir" != "X/usr/include"; then |
| haveit= |
| if test "X$additional_includedir" = "X/usr/local/include"; then |
| if test -n "$GCC"; then |
| case $host_os in |
| linux* | gnu* | k*bsd*-gnu) haveit=yes;; |
| esac |
| fi |
| fi |
| if test -z "$haveit"; then |
| for x in $CPPFLAGS $INC[]NAME; do |
| AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) |
| if test "X$x" = "X-I$additional_includedir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| if test -d "$additional_includedir"; then |
| dnl Really add $additional_includedir to $INCNAME. |
| INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir" |
| fi |
| fi |
| fi |
| fi |
| fi |
| dnl Look for dependencies. |
| if test -n "$found_la"; then |
| dnl Read the .la file. It defines the variables |
| dnl dlname, library_names, old_library, dependency_libs, current, |
| dnl age, revision, installed, dlopen, dlpreopen, libdir. |
| save_libdir="$libdir" |
| case "$found_la" in |
| */* | *\\*) . "$found_la" ;; |
| *) . "./$found_la" ;; |
| esac |
| libdir="$save_libdir" |
| dnl We use only dependency_libs. |
| for dep in $dependency_libs; do |
| case "$dep" in |
| -L*) |
| additional_libdir=`echo "X$dep" | sed -e 's/^X-L//'` |
| dnl Potentially add $additional_libdir to $LIBNAME and $LTLIBNAME. |
| dnl But don't add it |
| dnl 1. if it's the standard /usr/lib, |
| dnl 2. if it's /usr/local/lib and we are using GCC on Linux, |
| dnl 3. if it's already present in $LDFLAGS or the already |
| dnl constructed $LIBNAME, |
| dnl 4. if it doesn't exist as a directory. |
| if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then |
| haveit= |
| if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then |
| if test -n "$GCC"; then |
| case $host_os in |
| linux* | gnu* | k*bsd*-gnu) haveit=yes;; |
| esac |
| fi |
| fi |
| if test -z "$haveit"; then |
| haveit= |
| for x in $LDFLAGS $LIB[]NAME; do |
| AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) |
| if test "X$x" = "X-L$additional_libdir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| if test -d "$additional_libdir"; then |
| dnl Really add $additional_libdir to $LIBNAME. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$additional_libdir" |
| fi |
| fi |
| haveit= |
| for x in $LDFLAGS $LTLIB[]NAME; do |
| AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) |
| if test "X$x" = "X-L$additional_libdir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| if test -d "$additional_libdir"; then |
| dnl Really add $additional_libdir to $LTLIBNAME. |
| LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$additional_libdir" |
| fi |
| fi |
| fi |
| fi |
| ;; |
| -R*) |
| dir=`echo "X$dep" | sed -e 's/^X-R//'` |
| if test "$enable_rpath" != no; then |
| dnl Potentially add DIR to rpathdirs. |
| dnl The rpathdirs will be appended to $LIBNAME at the end. |
| haveit= |
| for x in $rpathdirs; do |
| if test "X$x" = "X$dir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| rpathdirs="$rpathdirs $dir" |
| fi |
| dnl Potentially add DIR to ltrpathdirs. |
| dnl The ltrpathdirs will be appended to $LTLIBNAME at the end. |
| haveit= |
| for x in $ltrpathdirs; do |
| if test "X$x" = "X$dir"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| ltrpathdirs="$ltrpathdirs $dir" |
| fi |
| fi |
| ;; |
| -l*) |
| dnl Handle this in the next round. |
| names_next_round="$names_next_round "`echo "X$dep" | sed -e 's/^X-l//'` |
| ;; |
| *.la) |
| dnl Handle this in the next round. Throw away the .la's |
| dnl directory; it is already contained in a preceding -L |
| dnl option. |
| names_next_round="$names_next_round "`echo "X$dep" | sed -e 's,^X.*/,,' -e 's,^lib,,' -e 's,\.la$,,'` |
| ;; |
| *) |
| dnl Most likely an immediate library name. |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$dep" |
| LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$dep" |
| ;; |
| esac |
| done |
| fi |
| else |
| dnl Didn't find the library; assume it is in the system directories |
| dnl known to the linker and runtime loader. (All the system |
| dnl directories known to the linker should also be known to the |
| dnl runtime loader, otherwise the system is severely misconfigured.) |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name" |
| LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-l$name" |
| fi |
| fi |
| fi |
| done |
| done |
| if test "X$rpathdirs" != "X"; then |
| if test -n "$hardcode_libdir_separator"; then |
| dnl Weird platform: only the last -rpath option counts, the user must |
| dnl pass all path elements in one option. We can arrange that for a |
| dnl single library, but not when more than one $LIBNAMEs are used. |
| alldirs= |
| for found_dir in $rpathdirs; do |
| alldirs="${alldirs}${alldirs:+$hardcode_libdir_separator}$found_dir" |
| done |
| dnl Note: hardcode_libdir_flag_spec uses $libdir and $wl. |
| acl_save_libdir="$libdir" |
| libdir="$alldirs" |
| eval flag=\"$hardcode_libdir_flag_spec\" |
| libdir="$acl_save_libdir" |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag" |
| else |
| dnl The -rpath options are cumulative. |
| for found_dir in $rpathdirs; do |
| acl_save_libdir="$libdir" |
| libdir="$found_dir" |
| eval flag=\"$hardcode_libdir_flag_spec\" |
| libdir="$acl_save_libdir" |
| LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag" |
| done |
| fi |
| fi |
| if test "X$ltrpathdirs" != "X"; then |
| dnl When using libtool, the option that works for both libraries and |
| dnl executables is -R. The -R options are cumulative. |
| for found_dir in $ltrpathdirs; do |
| LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-R$found_dir" |
| done |
| fi |
| ]) |
| |
| dnl AC_LIB_APPENDTOVAR(VAR, CONTENTS) appends the elements of CONTENTS to VAR, |
| dnl unless already present in VAR. |
| dnl Works only for CPPFLAGS, not for LIB* variables because that sometimes |
| dnl contains two or three consecutive elements that belong together. |
| AC_DEFUN([AC_LIB_APPENDTOVAR], |
| [ |
| for element in [$2]; do |
| haveit= |
| for x in $[$1]; do |
| AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) |
| if test "X$x" = "X$element"; then |
| haveit=yes |
| break |
| fi |
| done |
| if test -z "$haveit"; then |
| [$1]="${[$1]}${[$1]:+ }$element" |
| fi |
| done |
| ]) |
