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d484bfbace
Also add --conditional-dependencies to the flags. See: https://lists.gnu.org/archive/html/guile-devel/2016-07/msg00012.html
55 lines
1.7 KiB
Text
55 lines
1.7 KiB
Text
# link.m4 serial 8
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dnl Copyright (C) 2009-2016 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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AC_DEFUN([gl_FUNC_LINK],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_FUNCS_ONCE([link])
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if test $ac_cv_func_link = no; then
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HAVE_LINK=0
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else
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AC_CACHE_CHECK([whether link obeys POSIX],
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[gl_cv_func_link_works],
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[touch conftest.a
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# Assume that if we have lstat, we can also check symlinks.
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if test $ac_cv_func_lstat = yes; then
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ln -s conftest.a conftest.lnk
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fi
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AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <unistd.h>
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]],
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[[int result = 0;
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if (!link ("conftest.a", "conftest.b/"))
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result |= 1;
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#if HAVE_LSTAT
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if (!link ("conftest.lnk/", "conftest.b"))
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result |= 2;
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if (rename ("conftest.a", "conftest.b"))
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result |= 4;
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if (!link ("conftest.b", "conftest.lnk"))
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result |= 8;
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#endif
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return result;
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]])],
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[gl_cv_func_link_works=yes], [gl_cv_func_link_works=no],
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[case "$host_os" in
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# Guess yes on glibc systems.
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*-gnu*) gl_cv_func_link_works="guessing yes" ;;
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# If we don't know, assume the worst.
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*) gl_cv_func_link_works="guessing no" ;;
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esac
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])
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rm -f conftest.a conftest.b conftest.lnk])
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case "$gl_cv_func_link_works" in
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*yes) ;;
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*)
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REPLACE_LINK=1
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;;
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esac
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fi
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])
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