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55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
# readlinkat.m4
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# serial 10
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dnl Copyright (C) 2009-2024 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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# See if we need to provide readlinkat replacement.
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# Written by Eric Blake.
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AC_DEFUN([gl_FUNC_READLINKAT],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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gl_CHECK_FUNCS_ANDROID([readlinkat], [[#include <unistd.h>]])
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AC_REQUIRE([gl_FUNC_READLINK])
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if test $ac_cv_func_readlinkat = no; then
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HAVE_READLINKAT=0
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case "$gl_cv_onwards_func_readlinkat" in
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future*) REPLACE_READLINKAT=1 ;;
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esac
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else
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AC_CACHE_CHECK([whether readlinkat signature is correct],
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[gl_cv_decl_readlinkat_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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/* Check whether original declaration has correct type. */
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ssize_t readlinkat (int, char const *, char *, size_t);
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]])
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],
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[gl_cv_decl_readlinkat_works=yes],
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[gl_cv_decl_readlinkat_works=no])
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])
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# Assume readlinkat has the same bugs as readlink,
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# as is the case on macOS 14 with trailing slashes.
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case $gl_cv_decl_readlinkat_works,$gl_cv_func_readlink_trailing_slash,$gl_cv_func_readlink_truncate in
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*yes,*yes,*yes)
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;;
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*)
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REPLACE_READLINKAT=1
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;;
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esac
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dnl On Cygwin 3.3.6, readlinkat(AT_FDCWD,"/dev/null") returns
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dnl "\\Device\\Null", which is unusable.
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case "$host_os" in
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cygwin*)
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REPLACE_READLINKAT=1
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;;
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esac
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fi
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])
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