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annotate m4/lib-ignore.m4 @ 12909:86f1ff71881a

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utime: remove obsolete module This module, like autoconf's AC_FUNC_UTIME_NULL macro, has been unnecessary for years, and has been marked as obsolete for 10 months. * modules/utime: Remove file. * lib/utime.c: Remove file. * m4/utime.m4: Remove file. * m4/utimes-null.m4: Remove file. * doc/posix-functions/utime.texi (utime): Remove reference to the module. Move the sole "fixed by gnulib" item into the "problems not fixed by Gnulib" list. * MODULES.html.sh (func_all_modules): Remove reference to "utime".
author Jim Meyering <meyering@redhat.com>
date Thu, 04 Mar 2010 15:36:51 +0100
parents c2cbabec01dd
children 90e90e0b8a97
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1 # If possible, ignore libraries that are not depended on.
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2
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3 dnl Copyright (C) 2006, 2009-2010 Free Software Foundation, Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 dnl Written by Paul Eggert.
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9
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10 AC_DEFUN([gl_IGNORE_UNUSED_LIBRARIES],
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11 [
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12 AC_CACHE_CHECK([for flag to ignore unused libraries],
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13 [gl_cv_ignore_unused_libraries],
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14 [gl_cv_ignore_unused_libraries=none
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15 gl_saved_ldflags=$LDFLAGS
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16 gl_saved_libs=$LIBS
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17 # Link with -lm to detect binutils 2.16 bug with --as-needed; see
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18 # <http://lists.gnu.org/archive/html/bug-gnulib/2006-06/msg00131.html>.
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19 LIBS="$LIBS -lm"
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20 # Use long option sequences like '-z ignore' to test for the feature,
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21 # to forestall problems with linkers that have -z, -i, -g, -n, etc. flags.
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22 # GCC + binutils likes '-Wl,--as-needed'.
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23 # GCC + Solaris ld likes '-Wl,-z,ignore'.
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24 # Sun C likes '-z ignore'.
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25 # Don't try bare '--as-needed'; nothing likes it and the HP-UX 11.11
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26 # native cc issues annoying warnings and then ignores it,
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27 # which would cause us to incorrectly conclude that it worked.
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28 for gl_flags in \
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29 '-Wl,--as-needed' \
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30 '-Wl,-z,ignore' \
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31 '-z ignore'
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32 do
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33 LDFLAGS="$gl_flags $LDFLAGS"
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34 AC_LINK_IFELSE([AC_LANG_PROGRAM()],
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35 [gl_cv_ignore_unused_libraries=$gl_flags])
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36 LDFLAGS=$gl_saved_ldflags
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37 test "$gl_cv_ignore_unused_libraries" != none && break
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38 done
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39 LIBS=$gl_saved_libs])
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40
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41 test "$gl_cv_ignore_unused_libraries" != none &&
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42 LDFLAGS="$LDFLAGS $gl_cv_ignore_unused_libraries"
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43 ])