63 lines
2.3 KiB
Text
63 lines
2.3 KiB
Text
# symlinkat.m4
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# serial 13
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dnl Copyright (C) 2009-2025 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 This file is offered as-is, without any warranty.
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# See if we need to provide symlinkat replacement.
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# Written by Eric Blake.
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AC_DEFUN([gl_FUNC_SYMLINKAT],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_OPENAT])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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gl_CHECK_FUNCS_ANDROID([symlinkat], [[#include <unistd.h>]])
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if test $ac_cv_func_symlinkat = no; then
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HAVE_SYMLINKAT=0
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case "$gl_cv_onwards_func_symlinkat" in
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future*) REPLACE_SYMLINKAT=1 ;;
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esac
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else
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AC_CACHE_CHECK([whether symlinkat handles trailing slash correctly],
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[gl_cv_func_symlinkat_works],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <fcntl.h>
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#include <unistd.h>
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]],
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[[int result = 0;
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if (!symlinkat ("a", AT_FDCWD, "conftest.link/"))
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result |= 1;
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if (symlinkat ("conftest.f", AT_FDCWD, "conftest.lnk2"))
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result |= 2;
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else if (!symlinkat ("a", AT_FDCWD, "conftest.lnk2/"))
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result |= 4;
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return result;
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]])],
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[gl_cv_func_symlinkat_works=yes],
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[gl_cv_func_symlinkat_works=no],
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[case "$host_os" in
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# Guess yes on Linux systems.
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linux-* | linux) gl_cv_func_symlinkat_works="guessing yes" ;;
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# Guess yes on systems that emulate the Linux system calls.
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midipix*) gl_cv_func_symlinkat_works="guessing yes" ;;
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_symlinkat_works="guessing yes" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_symlinkat_works="$gl_cross_guess_normal" ;;
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esac
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])
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rm -f conftest.f conftest.link conftest.lnk2])
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case "$gl_cv_func_symlinkat_works" in
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*yes) ;;
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*)
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REPLACE_SYMLINKAT=1
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;;
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esac
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fi
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])
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