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