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# lib-link.m4 serial 6 (gettext-0.14.3)
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dnl Copyright (C) 2001-2005 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl AC_LIB_LINKFLAGS(name [, dependencies]) searches for libname and
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dnl the libraries corresponding to explicit and implicit dependencies.
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dnl Sets and AC_SUBSTs the LIB${NAME} and LTLIB${NAME} variables and
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dnl augments the CPPFLAGS variable.
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AC_DEFUN([AC_LIB_LINKFLAGS],
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AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
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AC_REQUIRE([AC_LIB_RPATH])
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define([Name],[translit([$1],[./-], [___])])
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define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
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AC_CACHE_CHECK([how to link with lib[]$1], [ac_cv_lib[]Name[]_libs], [
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AC_LIB_LINKFLAGS_BODY([$1], [$2])
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ac_cv_lib[]Name[]_libs="$LIB[]NAME"
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ac_cv_lib[]Name[]_ltlibs="$LTLIB[]NAME"
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ac_cv_lib[]Name[]_cppflags="$INC[]NAME"
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LIB[]NAME="$ac_cv_lib[]Name[]_libs"
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LTLIB[]NAME="$ac_cv_lib[]Name[]_ltlibs"
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INC[]NAME="$ac_cv_lib[]Name[]_cppflags"
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AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
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dnl Also set HAVE_LIB[]NAME so that AC_LIB_HAVE_LINKFLAGS can reuse the
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dnl results of this search when this library appears as a dependency.
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dnl AC_LIB_HAVE_LINKFLAGS(name, dependencies, includes, testcode)
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dnl searches for libname and the libraries corresponding to explicit and
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dnl implicit dependencies, together with the specified include files and
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dnl the ability to compile and link the specified testcode. If found, it
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dnl sets and AC_SUBSTs HAVE_LIB${NAME}=yes and the LIB${NAME} and
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dnl LTLIB${NAME} variables and augments the CPPFLAGS variable, and
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dnl #defines HAVE_LIB${NAME} to 1. Otherwise, it sets and AC_SUBSTs
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dnl HAVE_LIB${NAME}=no and LIB${NAME} and LTLIB${NAME} to empty.
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AC_DEFUN([AC_LIB_HAVE_LINKFLAGS],
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AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
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AC_REQUIRE([AC_LIB_RPATH])
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define([Name],[translit([$1],[./-], [___])])
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define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
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dnl Search for lib[]Name and define LIB[]NAME, LTLIB[]NAME and INC[]NAME
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AC_LIB_LINKFLAGS_BODY([$1], [$2])
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dnl Add $INC[]NAME to CPPFLAGS before performing the following checks,
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dnl because if the user has installed lib[]Name and not disabled its use
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dnl via --without-lib[]Name-prefix, he wants to use it.
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ac_save_CPPFLAGS="$CPPFLAGS"
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AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
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AC_CACHE_CHECK([for lib[]$1], [ac_cv_lib[]Name], [
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LIBS="$LIBS $LIB[]NAME"
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AC_TRY_LINK([$3], [$4], [ac_cv_lib[]Name=yes], [ac_cv_lib[]Name=no])
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if test "$ac_cv_lib[]Name" = yes; then
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AC_DEFINE([HAVE_LIB]NAME, 1, [Define if you have the $1 library.])
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AC_MSG_CHECKING([how to link with lib[]$1])
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AC_MSG_RESULT([$LIB[]NAME])
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dnl If $LIB[]NAME didn't lead to a usable library, we don't need
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dnl $INC[]NAME either.
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CPPFLAGS="$ac_save_CPPFLAGS"
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AC_SUBST([HAVE_LIB]NAME)
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dnl Determine the platform dependent parameters needed to use rpath:
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dnl libext, shlibext, hardcode_libdir_flag_spec, hardcode_libdir_separator,
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dnl hardcode_direct, hardcode_minus_L.
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AC_DEFUN([AC_LIB_RPATH],
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dnl Tell automake >= 1.10 to complain if config.rpath is missing.
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m4_ifdef([AC_REQUIRE_AUX_FILE], [AC_REQUIRE_AUX_FILE([config.rpath])])
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AC_REQUIRE([AC_PROG_CC]) dnl we use $CC, $GCC, $LDFLAGS
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AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD, $with_gnu_ld
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host
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AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
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AC_CACHE_CHECK([for shared library run path origin], acl_cv_rpath, [
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CC="$CC" GCC="$GCC" LDFLAGS="$LDFLAGS" LD="$LD" with_gnu_ld="$with_gnu_ld" \
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${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.rpath" "$host" > conftest.sh
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libext="$acl_cv_libext"
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shlibext="$acl_cv_shlibext"
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hardcode_libdir_flag_spec="$acl_cv_hardcode_libdir_flag_spec"
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hardcode_libdir_separator="$acl_cv_hardcode_libdir_separator"
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hardcode_direct="$acl_cv_hardcode_direct"
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hardcode_minus_L="$acl_cv_hardcode_minus_L"
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dnl Determine whether the user wants rpath handling at all.
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[ --disable-rpath do not hardcode runtime library paths],
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dnl AC_LIB_LINKFLAGS_BODY(name [, dependencies]) searches for libname and
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dnl the libraries corresponding to explicit and implicit dependencies.
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dnl Sets the LIB${NAME}, LTLIB${NAME} and INC${NAME} variables.
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AC_DEFUN([AC_LIB_LINKFLAGS_BODY],
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define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
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dnl By default, look in $includedir and $libdir.
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AC_LIB_WITH_FINAL_PREFIX([
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eval additional_includedir=\"$includedir\"
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eval additional_libdir=\"$libdir\"
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AC_LIB_ARG_WITH([lib$1-prefix],
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[ --with-lib$1-prefix[=DIR] search for lib$1 in DIR/include and DIR/lib
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--without-lib$1-prefix don't search for lib$1 in includedir and libdir],
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if test "X$withval" = "Xno"; then
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if test "X$withval" = "X"; then
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AC_LIB_WITH_FINAL_PREFIX([
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eval additional_includedir=\"$includedir\"
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eval additional_libdir=\"$libdir\"
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additional_includedir="$withval/include"
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additional_libdir="$withval/lib"
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dnl Search the library and its dependencies in $additional_libdir and
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dnl $LDFLAGS. Using breadth-first-seach.
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names_already_handled=
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names_next_round='$1 $2'
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while test -n "$names_next_round"; do
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names_this_round="$names_next_round"
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for name in $names_this_round; do
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for n in $names_already_handled; do
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if test "$n" = "$name"; then
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if test -z "$already_handled"; then
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names_already_handled="$names_already_handled $name"
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dnl See if it was already located by an earlier AC_LIB_LINKFLAGS
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dnl or AC_LIB_HAVE_LINKFLAGS call.
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uppername=`echo "$name" | sed -e 'y|abcdefghijklmnopqrstuvwxyz./-|ABCDEFGHIJKLMNOPQRSTUVWXYZ___|'`
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eval value=\"\$HAVE_LIB$uppername\"
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if test -n "$value"; then
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if test "$value" = yes; then
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eval value=\"\$LIB$uppername\"
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test -z "$value" || LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$value"
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eval value=\"\$LTLIB$uppername\"
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test -z "$value" || LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$value"
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dnl An earlier call to AC_LIB_HAVE_LINKFLAGS has determined
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dnl that this library doesn't exist. So just drop it.
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dnl Search the library lib$name in $additional_libdir and $LDFLAGS
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dnl and the already constructed $LIBNAME/$LTLIBNAME.
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if test $use_additional = yes; then
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if test -n "$shlibext" && test -f "$additional_libdir/lib$name.$shlibext"; then
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found_dir="$additional_libdir"
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found_so="$additional_libdir/lib$name.$shlibext"
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if test -f "$additional_libdir/lib$name.la"; then
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found_la="$additional_libdir/lib$name.la"
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if test -f "$additional_libdir/lib$name.$libext"; then
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found_dir="$additional_libdir"
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found_a="$additional_libdir/lib$name.$libext"
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if test -f "$additional_libdir/lib$name.la"; then
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found_la="$additional_libdir/lib$name.la"
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if test "X$found_dir" = "X"; then
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for x in $LDFLAGS $LTLIB[]NAME; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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dir=`echo "X$x" | sed -e 's/^X-L//'`
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if test -n "$shlibext" && test -f "$dir/lib$name.$shlibext"; then
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found_so="$dir/lib$name.$shlibext"
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if test -f "$dir/lib$name.la"; then
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found_la="$dir/lib$name.la"
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if test -f "$dir/lib$name.$libext"; then
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found_a="$dir/lib$name.$libext"
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if test -f "$dir/lib$name.la"; then
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found_la="$dir/lib$name.la"
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if test "X$found_dir" != "X"; then
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if test "X$found_dir" != "X"; then
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dnl Found the library.
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LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$found_dir -l$name"
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if test "X$found_so" != "X"; then
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dnl Linking with a shared library. We attempt to hardcode its
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dnl directory into the executable's runpath, unless it's the
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dnl standard /usr/lib.
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if test "$enable_rpath" = no || test "X$found_dir" = "X/usr/lib"; then
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dnl No hardcoding is needed.
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
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dnl Use an explicit option to hardcode DIR into the resulting
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dnl Potentially add DIR to ltrpathdirs.
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dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
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for x in $ltrpathdirs; do
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if test "X$x" = "X$found_dir"; then
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if test -z "$haveit"; then
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ltrpathdirs="$ltrpathdirs $found_dir"
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dnl The hardcoding into $LIBNAME is system dependent.
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if test "$hardcode_direct" = yes; then
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dnl Using DIR/libNAME.so during linking hardcodes DIR into the
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dnl resulting binary.
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
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if test -n "$hardcode_libdir_flag_spec" && test "$hardcode_minus_L" = no; then
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dnl Use an explicit option to hardcode DIR into the resulting
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
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dnl Potentially add DIR to rpathdirs.
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dnl The rpathdirs will be appended to $LIBNAME at the end.
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for x in $rpathdirs; do
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if test "X$x" = "X$found_dir"; then
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if test -z "$haveit"; then
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rpathdirs="$rpathdirs $found_dir"
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dnl Rely on "-L$found_dir".
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dnl But don't add it if it's already contained in the LDFLAGS
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dnl or the already constructed $LIBNAME
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for x in $LDFLAGS $LIB[]NAME; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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if test "X$x" = "X-L$found_dir"; then
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if test -z "$haveit"; then
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir"
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if test "$hardcode_minus_L" != no; then
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dnl FIXME: Not sure whether we should use
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dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
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dnl We cannot use $hardcode_runpath_var and LD_RUN_PATH
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dnl here, because this doesn't fit in flags passed to the
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dnl compiler. So give up. No hardcoding. This affects only
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dnl very old systems.
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dnl FIXME: Not sure whether we should use
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dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
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if test "X$found_a" != "X"; then
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dnl Linking with a static library.
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_a"
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dnl We shouldn't come here, but anyway it's good to have a
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir -l$name"
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dnl Assume the include files are nearby.
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additional_includedir=
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basedir=`echo "X$found_dir" | sed -e 's,^X,,' -e 's,/lib/*$,,'`
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additional_includedir="$basedir/include"
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if test "X$additional_includedir" != "X"; then
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dnl Potentially add $additional_includedir to $INCNAME.
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dnl 1. if it's the standard /usr/include,
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dnl 2. if it's /usr/local/include and we are using GCC on Linux,
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dnl 3. if it's already present in $CPPFLAGS or the already
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dnl constructed $INCNAME,
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dnl 4. if it doesn't exist as a directory.
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if test "X$additional_includedir" != "X/usr/include"; then
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if test "X$additional_includedir" = "X/usr/local/include"; then
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if test -n "$GCC"; then
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linux* | gnu* | k*bsd*-gnu) haveit=yes;;
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if test -z "$haveit"; then
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for x in $CPPFLAGS $INC[]NAME; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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if test "X$x" = "X-I$additional_includedir"; then
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if test -z "$haveit"; then
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if test -d "$additional_includedir"; then
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dnl Really add $additional_includedir to $INCNAME.
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INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir"
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dnl Look for dependencies.
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if test -n "$found_la"; then
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dnl Read the .la file. It defines the variables
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dnl dlname, library_names, old_library, dependency_libs, current,
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dnl age, revision, installed, dlopen, dlpreopen, libdir.
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save_libdir="$libdir"
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*/* | *\\*) . "$found_la" ;;
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*) . "./$found_la" ;;
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libdir="$save_libdir"
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dnl We use only dependency_libs.
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for dep in $dependency_libs; do
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additional_libdir=`echo "X$dep" | sed -e 's/^X-L//'`
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dnl Potentially add $additional_libdir to $LIBNAME and $LTLIBNAME.
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dnl 1. if it's the standard /usr/lib,
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dnl 2. if it's /usr/local/lib and we are using GCC on Linux,
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dnl 3. if it's already present in $LDFLAGS or the already
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dnl constructed $LIBNAME,
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dnl 4. if it doesn't exist as a directory.
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if test "X$additional_libdir" != "X/usr/lib"; then
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if test "X$additional_libdir" = "X/usr/local/lib"; then
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if test -n "$GCC"; then
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linux* | gnu* | k*bsd*-gnu) haveit=yes;;
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if test -z "$haveit"; then
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for x in $LDFLAGS $LIB[]NAME; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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if test "X$x" = "X-L$additional_libdir"; then
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if test -z "$haveit"; then
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if test -d "$additional_libdir"; then
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dnl Really add $additional_libdir to $LIBNAME.
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$additional_libdir"
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for x in $LDFLAGS $LTLIB[]NAME; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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if test "X$x" = "X-L$additional_libdir"; then
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if test -z "$haveit"; then
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if test -d "$additional_libdir"; then
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dnl Really add $additional_libdir to $LTLIBNAME.
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LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$additional_libdir"
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dir=`echo "X$dep" | sed -e 's/^X-R//'`
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if test "$enable_rpath" != no; then
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dnl Potentially add DIR to rpathdirs.
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dnl The rpathdirs will be appended to $LIBNAME at the end.
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for x in $rpathdirs; do
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if test "X$x" = "X$dir"; then
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if test -z "$haveit"; then
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rpathdirs="$rpathdirs $dir"
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dnl Potentially add DIR to ltrpathdirs.
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dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
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for x in $ltrpathdirs; do
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if test "X$x" = "X$dir"; then
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if test -z "$haveit"; then
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ltrpathdirs="$ltrpathdirs $dir"
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dnl Handle this in the next round.
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names_next_round="$names_next_round "`echo "X$dep" | sed -e 's/^X-l//'`
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dnl Handle this in the next round. Throw away the .la's
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dnl directory; it is already contained in a preceding -L
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names_next_round="$names_next_round "`echo "X$dep" | sed -e 's,^X.*/,,' -e 's,^lib,,' -e 's,\.la$,,'`
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dnl Most likely an immediate library name.
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$dep"
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LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$dep"
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dnl Didn't find the library; assume it is in the system directories
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dnl known to the linker and runtime loader. (All the system
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dnl directories known to the linker should also be known to the
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dnl runtime loader, otherwise the system is severely misconfigured.)
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
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LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-l$name"
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if test "X$rpathdirs" != "X"; then
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if test -n "$hardcode_libdir_separator"; then
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dnl Weird platform: only the last -rpath option counts, the user must
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dnl pass all path elements in one option. We can arrange that for a
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dnl single library, but not when more than one $LIBNAMEs are used.
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for found_dir in $rpathdirs; do
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alldirs="${alldirs}${alldirs:+$hardcode_libdir_separator}$found_dir"
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dnl Note: hardcode_libdir_flag_spec uses $libdir and $wl.
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acl_save_libdir="$libdir"
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eval flag=\"$hardcode_libdir_flag_spec\"
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libdir="$acl_save_libdir"
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
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dnl The -rpath options are cumulative.
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for found_dir in $rpathdirs; do
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acl_save_libdir="$libdir"
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eval flag=\"$hardcode_libdir_flag_spec\"
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libdir="$acl_save_libdir"
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LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
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if test "X$ltrpathdirs" != "X"; then
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dnl When using libtool, the option that works for both libraries and
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dnl executables is -R. The -R options are cumulative.
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for found_dir in $ltrpathdirs; do
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LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-R$found_dir"
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dnl AC_LIB_APPENDTOVAR(VAR, CONTENTS) appends the elements of CONTENTS to VAR,
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dnl unless already present in VAR.
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dnl Works only for CPPFLAGS, not for LIB* variables because that sometimes
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dnl contains two or three consecutive elements that belong together.
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AC_DEFUN([AC_LIB_APPENDTOVAR],
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for element in [$2]; do
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AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
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if test "X$x" = "X$element"; then
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if test -z "$haveit"; then
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[$1]="${[$1]}${[$1]:+ }$element"
added
removed
m4/lib-link.m4
