1 files changed, 70 insertions, 0 deletions
diff --git a/gl/m4/argp.m4 b/gl/m4/argp.m4
new file mode 100644
index 0000000..a6f7b8e
--- /dev/null
+++ b/gl/m4/argp.m4
@@ -0,0 +1,70 @@
+# argp.m4 serial 16
+dnl Copyright (C) 2003-2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_ARGP],
+[
+  AC_REQUIRE([AC_C_INLINE])
+  AC_REQUIRE([AC_C_RESTRICT])
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+  AC_CHECK_DECLS([program_invocation_name],
+    [],
+    [AC_DEFINE([GNULIB_PROGRAM_INVOCATION_NAME], [1],
+       [Define to 1 to add extern declaration of program_invocation_name to argp.h])],
+    [[#include <errno.h>]])
+  AC_CHECK_DECLS([program_invocation_short_name],
+    [],
+    [AC_DEFINE([GNULIB_PROGRAM_INVOCATION_SHORT_NAME], [1],
+       [Define to 1 to add extern declaration of program_invocation_short_name to argp.h])],
+    [[#include <errno.h>]])
+
+  # Check if program_invocation_name and program_invocation_short_name
+  # are defined elsewhere. It is improbable that only one of them will
+  # be defined and other not, I prefer to stay on the safe side and to
+  # test each one separately.
+  AC_MSG_CHECKING([whether program_invocation_name is defined])
+  AC_LINK_IFELSE(
+    [AC_LANG_PROGRAM(
+       [[extern char *program_invocation_name;]],
+       [[program_invocation_name = "test";]])],
+    [AC_DEFINE([HAVE_PROGRAM_INVOCATION_NAME], [1],
+       [Define if program_invocation_name is defined])
+     AC_MSG_RESULT([yes])
+    ],
+    [AC_MSG_RESULT([no])])
+
+  AC_MSG_CHECKING([whether program_invocation_short_name is defined])
+  AC_LINK_IFELSE(
+    [AC_LANG_PROGRAM(
+       [[extern char *program_invocation_short_name;]],
+       [[program_invocation_short_name = "test";]])],
+    [AC_DEFINE([HAVE_PROGRAM_INVOCATION_SHORT_NAME], [1],
+       [Define if program_invocation_short_name is defined])
+     AC_MSG_RESULT([yes])
+    ],
+    [AC_MSG_RESULT([no])])
+
+  AC_CHECK_DECLS_ONCE([clearerr_unlocked])
+  AC_CHECK_DECLS_ONCE([feof_unlocked])
+  AC_CHECK_DECLS_ONCE([ferror_unlocked])
+  AC_CHECK_DECLS_ONCE([fflush_unlocked])
+  AC_CHECK_DECLS_ONCE([fgets_unlocked])
+  AC_CHECK_DECLS_ONCE([fputc_unlocked])
+  AC_CHECK_DECLS_ONCE([fputs_unlocked])
+  AC_CHECK_DECLS_ONCE([fread_unlocked])
+  AC_CHECK_DECLS_ONCE([fwrite_unlocked])
+  AC_CHECK_DECLS_ONCE([getc_unlocked])
+  AC_CHECK_DECLS_ONCE([getchar_unlocked])
+  AC_CHECK_DECLS_ONCE([putc_unlocked])
+  AC_CHECK_DECLS_ONCE([putchar_unlocked])
+  AC_CHECK_FUNCS_ONCE([flockfile funlockfile])
+  AC_CHECK_HEADERS_ONCE([features.h linewrap.h])
+  AC_REQUIRE([AC_FUNC_STRERROR_R])
+])
+
+dnl argp-parse.c depends on GNU getopt internals, therefore use GNU getopt
+dnl always.
+AC_DEFUN([gl_REPLACE_GETOPT_ALWAYS], [])