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71 lines
2.4 KiB
71 lines
2.4 KiB
# readlink.m4 serial 12 |
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dnl Copyright (C) 2003, 2007, 2009-2017 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_READLINK], |
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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([readlink]) |
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if test $ac_cv_func_readlink = no; then |
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HAVE_READLINK=0 |
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else |
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AC_CACHE_CHECK([whether readlink signature is correct], |
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[gl_cv_decl_readlink_works], |
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[AC_COMPILE_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[#include <unistd.h> |
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/* Cause compilation failure if original declaration has wrong type. */ |
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ssize_t readlink (const char *, char *, size_t);]])], |
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[gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])]) |
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dnl Solaris 9 ignores trailing slash. |
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dnl FreeBSD 7.2 dereferences only one level of links with trailing slash. |
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AC_CACHE_CHECK([whether readlink handles trailing slash correctly], |
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[gl_cv_func_readlink_works], |
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[# We have readlink, so assume ln -s works. |
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ln -s conftest.no-such conftest.link |
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ln -s conftest.link conftest.lnk2 |
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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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]], [[char buf[20]; |
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return readlink ("conftest.lnk2/", buf, sizeof buf) != -1;]])], |
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[gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_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_readlink_works="guessing yes" ;; |
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# If we don't know, assume the worst. |
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*) gl_cv_func_readlink_works="guessing no" ;; |
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esac |
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]) |
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rm -f conftest.link conftest.lnk2]) |
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case "$gl_cv_func_readlink_works" in |
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*yes) |
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if test "$gl_cv_decl_readlink_works" != yes; then |
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REPLACE_READLINK=1 |
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fi |
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;; |
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*) |
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AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink |
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fails to recognize a trailing slash.]) |
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REPLACE_READLINK=1 |
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;; |
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esac |
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fi |
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]) |
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# Like gl_FUNC_READLINK, except prepare for separate compilation |
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# (no REPLACE_READLINK, no AC_LIBOBJ). |
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AC_DEFUN([gl_FUNC_READLINK_SEPARATE], |
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[ |
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AC_CHECK_FUNCS_ONCE([readlink]) |
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gl_PREREQ_READLINK |
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]) |
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# Prerequisites of lib/readlink.c. |
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AC_DEFUN([gl_PREREQ_READLINK], |
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[ |
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: |
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])
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