clang on native Windows shows a warning:
gllib\write-any-file.c(44,14): warning: implicit declaration of function
'geteuid' is invalid in C99 [-Wimplicit-function-declaration]
geteuid does not exist on native Windows. Let's do like in tests/test-access.h.
This patch should fix the issue.
2024-08-27 Bruno Haible <br...@clisp.org>
write-any-file: Don't reference an undefined function on native Windows.
* m4/write-any-file.m4 (): Remove test for <priv.h>, obsolete since
2009-05-03. Test for geteuid.
* lib/write-any-file.c (geteuid): Define a fallback.
diff --git a/lib/write-any-file.c b/lib/write-any-file.c
index 27ca2c47c5..d1f98471a9 100644
--- a/lib/write-any-file.c
+++ b/lib/write-any-file.c
@@ -19,11 +19,18 @@
#include <config.h>
+/* Specification. */
#include "write-any-file.h"
+
+#include <unistd.h>
+
#include "priv-set.h"
#include "root-uid.h"
-#include <unistd.h>
+/* mingw and MSVC 9 lack geteuid, so setup a dummy value. */
+#if !HAVE_GETEUID
+# define geteuid() ROOT_UID
+#endif
/* Return true if we know that we can write any file, including
writing directories. */
diff --git a/m4/write-any-file.m4 b/m4/write-any-file.m4
index 50e5aa0c2a..621d9b9e41 100644
--- a/m4/write-any-file.m4
+++ b/m4/write-any-file.m4
@@ -1,5 +1,5 @@
# write-any-file.m4
-# serial 1
+# serial 2
dnl Copyright (C) 2007, 2009-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -11,5 +11,5 @@
AC_DEFUN([gl_WRITE_ANY_FILE],
[
- AC_CHECK_HEADERS_ONCE([priv.h])
+ AC_CHECK_FUNCS_ONCE([geteuid])
])
