cdecl99: Avoid gnulib setlocale_null bits.

As this is a single-threaded application which does nothing exciting
regarding locales, we shouldn't need the setlocale_null replacement.
This performs a pile of configure tests related to the thread safety
of setlocale(x, NULL), which includes possibly pulling in threading
libraries and a bunch of other nonsense.

To do this, we replace hard-locale (the only module using this) with
an inline function using setlocale directly (inline is much better,
because there is only one call site).

diff --git a/lib/local/lib/hard-locale.h b/lib/local/lib/hard-locale.h
new file mode 100644 (file)
index 0000000..b5d95e3
--- /dev/null
+++ b/lib/local/lib/hard-locale.h
@@ -0,0 +1,41 @@
+/* Determine whether a locale is hard.
+ *
+ * Copyright (C) 1997-1999, 2002-2004, 2006-2007, 2009-2022 Free Software
+ * Foundation, Inc.
+ *
+ * Imported from Gnulib hard-locale.[ch] with modifications by Nick Bowler:
+ *
+ *  - Remove all setlocale workarounds, as our use case does not do anything
+ *    fancy with locales and does not require thread safety (2024-01).
+ *
+ * This file is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef HARD_LOCALE_H_
+#define HARD_LOCALE_H_
+
+#include <string.h>
+#include <locale.h>
+
+static inline int hard_locale(int locale)
+{
+       char *name;
+
+       if (!(name = setlocale(locale, NULL)))
+               return 0;
+
+       return strcmp(name, "C") && strcmp(name, "POSIX");
+}
+
+#endif

diff --git a/lib/local/modules/hard-locale b/lib/local/modules/hard-locale
new file mode 100644 (file)
index 0000000..eb0ec8f
--- /dev/null
+++ b/lib/local/modules/hard-locale
@@ -0,0 +1,22 @@
+Description:
+Determine whether the current locale is different from the "C" locale
+(simplified version with all multithreading bits removed).
+
+Files:
+lib/hard-locale.h
+
+Depends-on:
+gnulib-local
+
+configure.ac:
+m4_set_add_all([DX_GNULIB_LOCAL_DIST], [modules/hard-locale],
+  [lib/hard-locale.h])dnl
+AC_REQUIRE([AC_C_INLINE])dnl
+
+Makefile.am:
+
+License:
+LGPLv2+
+
+Maintainer:
+Nick Bowler