Update from Gnulib by running admin/merge-gnulib

m4/gnulib-common.m4

@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 74
+# gnulib-common.m4 serial 76
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -187,7 +187,14 @@ AC_DEFUN([gl_COMMON_BODY], [
    to use this earlier definition, since <stdlib.h> may not have been included
    yet.  */
 #ifndef _GL_ATTRIBUTE_DEALLOC_FREE
-# define _GL_ATTRIBUTE_DEALLOC_FREE _GL_ATTRIBUTE_DEALLOC (free, 1)
+# if defined __cplusplus && defined __GNUC__ && !defined __clang__
+/* Work around GCC bug <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108231> */
+#  define _GL_ATTRIBUTE_DEALLOC_FREE \
+     _GL_ATTRIBUTE_DEALLOC ((void (*) (void *)) free, 1)
+# else
+#  define _GL_ATTRIBUTE_DEALLOC_FREE \
+     _GL_ATTRIBUTE_DEALLOC (free, 1)
+# endif
 #endif
 
 /* _GL_ATTRIBUTE_DEPRECATED: Declares that an entity is deprecated.
@@ -309,7 +316,7 @@ AC_DEFUN([gl_COMMON_BODY], [
      - enumeration, enumeration item,
      - typedef,
    in C++ also: class.  */
-/* In C++ and C2x, this is spelled [[__maybe_unused__]].
+/* In C++ and C23, this is spelled [[__maybe_unused__]].
    GCC's syntax is __attribute__ ((__unused__)).
    clang supports both syntaxes.  */
 #ifdef __has_c_attribute
@@ -1016,6 +1023,30 @@ AC_DEFUN([gl_CONDITIONAL_HEADER],
   m4_popdef([gl_header_name])
 ])
 
+dnl gl_CHECK_FUNCS_ANDROID([func], [[#include <foo.h>]])
+dnl is like AC_CHECK_FUNCS([func]), taking into account a portability problem
+dnl on Android.
+dnl Namely, if func was added to Android API level, say, 28, then the libc.so
+dnl has the symbol func always, whereas the header file <foo.h> declares func
+dnl conditionally:
+dnl   #if __ANDROID_API__ >= 28
+dnl   ... func (...) __INTRODUCED_IN(28);
+dnl   #endif
+dnl Thus, when compiling with "clang -target armv7a-unknown-linux-android28",
+dnl the function func is declared and exists in libc.
+dnl Whereas when compiling with "clang -target armv7a-unknown-linux-android27",
+dnl the function func is not declared but exists in libc. We need to treat this
+dnl case like the case where func does not exist.
+AC_DEFUN([gl_CHECK_FUNCS_ANDROID],
+[
+  AC_CHECK_DECL([$1], , , [$2])
+  if test $ac_cv_have_decl_[$1] = yes; then
+    AC_CHECK_FUNCS([$1])
+  else
+    ac_cv_func_[$1]=no
+  fi
+])
+
 dnl Expands to some code for use in .c programs that, on native Windows, defines
 dnl the Microsoft deprecated alias function names to the underscore-prefixed
 dnl actual function names. With this macro, these function names are available