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+# iconv_h.m4 serial 16
+dnl Copyright (C) 2007-2022 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_ONCE([gl_ICONV_H],
+[
+ AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+
+ dnl Execute this unconditionally, because GL_GENERATE_ICONV_H may be set to
+ dnl true by other modules, after this code is executed.
+ gl_CHECK_NEXT_HEADERS([iconv.h])
+
+ dnl Check for declarations of anything we want to poison if the
+ dnl corresponding gnulib module is not in use, and which is not
+ dnl guaranteed by C89.
+ gl_WARN_ON_USE_PREPARE([[#include <iconv.h>
+ ]], [iconv iconv_open])
+
+ AC_REQUIRE([AC_C_RESTRICT])
+])
+
+dnl Unconditionally enables the replacement of <iconv.h>.
+AC_DEFUN([gl_REPLACE_ICONV_H],
+[
+ gl_ICONV_H_REQUIRE_DEFAULTS
+ GL_GENERATE_ICONV_H=true
+])
+
+# gl_ICONV_MODULE_INDICATOR([modulename])
+# sets the shell variable that indicates the presence of the given module
+# to a C preprocessor expression that will evaluate to 1.
+# This macro invocation must not occur in macros that are AC_REQUIREd.
+AC_DEFUN([gl_ICONV_MODULE_INDICATOR],
+[
+ dnl Ensure to expand the default settings once only.
+ gl_ICONV_H_REQUIRE_DEFAULTS
+ gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+])
+
+# Initializes the default values for AC_SUBSTed shell variables.
+# This macro must not be AC_REQUIREd. It must only be invoked, and only
+# outside of macros or in macros that are not AC_REQUIREd.
+AC_DEFUN([gl_ICONV_H_REQUIRE_DEFAULTS],
+[
+ m4_defun(GL_MODULE_INDICATOR_PREFIX[_ICONV_H_MODULE_INDICATOR_DEFAULTS], [
+ gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ICONV])
+ ])
+ m4_require(GL_MODULE_INDICATOR_PREFIX[_ICONV_H_MODULE_INDICATOR_DEFAULTS])
+ AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+])
+
+AC_DEFUN([gl_ICONV_H_DEFAULTS],
+[
+ m4_ifdef([gl_ANSI_CXX], [AC_REQUIRE([gl_ANSI_CXX])])
+ dnl Assume proper GNU behavior unless another module says otherwise.
+ ICONV_CONST=; AC_SUBST([ICONV_CONST])
+ REPLACE_ICONV=0; AC_SUBST([REPLACE_ICONV])
+ REPLACE_ICONV_OPEN=0; AC_SUBST([REPLACE_ICONV_OPEN])
+ REPLACE_ICONV_UTF=0; AC_SUBST([REPLACE_ICONV_UTF])
+ GL_GENERATE_ICONV_H=false
+ m4_ifdef([gl_POSIXCHECK],
+ [GL_GENERATE_ICONV_H=true],
+ [if m4_ifdef([gl_ANSI_CXX], [test "$CXX" != no], [false]); then
+ dnl Override <fnmatch.h> always, to support the C++ GNULIB_NAMESPACE.
+ GL_GENERATE_ICONV_H=true
+ fi
+ ])
+])