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82 lines
3.0 KiB
Plaintext
82 lines
3.0 KiB
Plaintext
# lstat.m4
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# serial 36
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dnl Copyright (C) 1997-2001, 2003-2024 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 From Jim Meyering.
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AC_DEFUN([gl_FUNC_LSTAT],
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[
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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dnl If lstat does not exist, the replacement <sys/stat.h> does
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dnl "#define lstat stat", and lstat.c is a no-op.
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AC_CHECK_FUNCS_ONCE([lstat])
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if test $ac_cv_func_lstat = yes; then
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AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
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case $host_os,$gl_cv_func_lstat_dereferences_slashed_symlink in
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darwin* | solaris* | *no)
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REPLACE_LSTAT=1
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;;
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esac
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else
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HAVE_LSTAT=0
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fi
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])
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# Prerequisites of lib/lstat.c.
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AC_DEFUN([gl_PREREQ_LSTAT], [:])
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AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK],
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[
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dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it
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dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ.
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether lstat correctly handles trailing slash],
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[gl_cv_func_lstat_dereferences_slashed_symlink],
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[rm -f conftest.sym conftest.file
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echo >conftest.file
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AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[AC_INCLUDES_DEFAULT],
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[[struct stat sbuf;
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if (symlink ("conftest.file", "conftest.sym") != 0)
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return 1;
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/* Linux will dereference the symlink and fail, as required by
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POSIX. That is better in the sense that it means we will not
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have to compile and use the lstat wrapper. */
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return lstat ("conftest.sym/", &sbuf) == 0;
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]])],
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[gl_cv_func_lstat_dereferences_slashed_symlink=yes],
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[gl_cv_func_lstat_dereferences_slashed_symlink=no],
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[case "$host_os" in
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linux-* | linux)
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# Guess yes on Linux systems.
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gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
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midipix*)
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# Guess yes on systems that emulate the Linux system calls.
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gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
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*-gnu* | gnu*)
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# Guess yes on glibc systems.
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gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
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mingw* | windows*)
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# Guess no on native Windows.
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gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;;
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*)
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# If we don't know, obey --enable-cross-guesses.
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gl_cv_func_lstat_dereferences_slashed_symlink="$gl_cross_guess_normal" ;;
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esac
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])
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rm -f conftest.sym conftest.file
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])
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case "$gl_cv_func_lstat_dereferences_slashed_symlink" in
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*yes)
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AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1],
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[Define to 1 if 'lstat' dereferences a symlink specified
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with a trailing slash.])
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;;
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esac
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])
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