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# If possible, ignore libraries that are not depended on.
dnl Copyright (C) 2006 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 Written by Paul Eggert.
AC_DEFUN([gl_IGNORE_UNUSED_LIBRARIES],
[
AC_CACHE_CHECK([for flag to ignore unused libraries],
[gl_cv_ignore_unused_libraries],
[gl_cv_ignore_unused_libraries=none
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[gl_ldd_output0=`(ldd conftest$ac_exeext) 2>/dev/null` ||
gl_ldd_output0=])
if test "$gl_ldd_output0"; then
gl_saved_ldflags=$LDFLAGS
gl_saved_libs=$LIBS
LIBS="$LIBS -lm"
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[gl_ldd_output1=`(ldd conftest$ac_exeext) 2>/dev/null` ||
gl_ldd_output1=])
if test "$gl_ldd_output1" && test "$gl_ldd_output0" != "$gl_ldd_output1"
then
for gl_flags in '-Xlinker -zignore' '-zignore'; do
LDFLAGS="$gl_flags $LDFLAGS"
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[if gl_ldd_output2=`(ldd conftest$ac_exeext) 2>/dev/null` &&
test "$gl_ldd_output0" = "$gl_ldd_output2"; then
gl_cv_ignore_unused_libraries=$gl_flags
fi])
LDFLAGS=$gl_saved_ldflags
test "gl_cv_ignore_unused_libraries" != none && break
done
fi
LIBS=$gl_saved_LIBS
fi])
test "$gl_cv_ignore_unused_libraries" != none &&
LDFLAGS="$LDFLAGS $gl_cv_ignore_unused_libraries"
])
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