I'm pushing this tweak of the AM_ICONV macro. It should have an effect only
on GNU libiconv itself, when built on a platform that does not have iconv
so far. In this situation, AM_ICONV used to not define ICONV_CONST, which
was OK before but leads to a compilation error now after some internal changes
in GNU libiconv.
2016-10-22 Bruno Haible <br...@clisp.org>
iconv: Avoid compilation error when bootstrapping GNU libiconv.
* m4/iconv.m4 (AM_ICONV): When the system does not have an iconv()
declaration yet, define ICONV_CONST to empty.
diff --git a/m4/iconv.m4 b/m4/iconv.m4
index aa159c5..bdafc54 100644
--- a/m4/iconv.m4
+++ b/m4/iconv.m4
@@ -1,4 +1,4 @@
-# iconv.m4 serial 19 (gettext-0.18.2)
+# iconv.m4 serial 20
dnl Copyright (C) 2000-2002, 2007-2014, 2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -258,14 +258,18 @@ size_t iconv();
am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/(
/(/'`
AC_MSG_RESULT([
$am_cv_proto_iconv])
- AC_DEFINE_UNQUOTED([ICONV_CONST], [$am_cv_proto_iconv_arg1],
- [Define as const if the declaration of iconv() needs const.])
- dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
- m4_ifdef([gl_ICONV_H_DEFAULTS],
- [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
- if test -n "$am_cv_proto_iconv_arg1"; then
- ICONV_CONST="const"
- fi
- ])
+ else
+ dnl When compiling GNU libiconv on a system that does not have iconv yet,
+ dnl pick the POSIX compliant declaration without 'const'.
+ am_cv_proto_iconv_arg1=""
fi
+ AC_DEFINE_UNQUOTED([ICONV_CONST], [$am_cv_proto_iconv_arg1],
+ [Define as const if the declaration of iconv() needs const.])
+ dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
+ m4_ifdef([gl_ICONV_H_DEFAULTS],
+ [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+ if test -n "$am_cv_proto_iconv_arg1"; then
+ ICONV_CONST="const"
+ fi
+ ])
])
