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Re: From wchar_t to char32_t
|
From: |
Bruno Haible |
|
Subject: |
Re: From wchar_t to char32_t |
|
Date: |
Sat, 01 Jul 2023 10:22:12 +0200 |
This patch migrates the 'quotearg' module from wchar_t to char32_t.
Note about the link dependency updates:
- Adding $(LIBUNISTRING) is needed to avoid link errors
on macOS, FreeBSD, NetBSD, Solaris
when module 'libunistring-optional' is present and a libunistring is
installed.
- Adding $(LIBC32CONV) is needed to avoid link errors
on macOS, FreeBSD
when the module 'uchar-c23' is present.
Packages that don't use 'libunistring-optional' nor 'uchar-c23' don't need to
change their *_LDADD variables.
2023-07-01 Bruno Haible <bruno@clisp.org>
quotearg: Overcome wchar_t limitations.
* lib/quotearg.c: Include <uchar.h> instead of <wchar.h>, <wctype.h>.
(quotearg_buffer_restyled): Use mbrtoc32, c32isprint instead of mbrtowc,
iswprint.
* modules/quotearg (Files): Remove m4/mbstate_t.m4, m4/mbrtowc.m4
(redundant).
(Depends-on): Add uchar, mbrtoc32, c32isprint. Remove wchar, wctype-h,
mbrtowc.
(Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/quotearg-tests (Makefile.am): Link test-quotearg with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/quotearg-simple (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/quotearg-simple-tests (Makefile.am): Link test-quotearg-simple
with $(LIBUNISTRING) $(LIBC32CONV).
--
* modules/quote (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
--
* modules/acl (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/acl-tests (Makefile.am): Link test-set-mode-acl and
test-copy-acl with $(LIBUNISTRING) $(LIBC32CONV).
* modules/copy-file (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/copy-file-tests (Makefile.am): Link test-copy-file with
$(LIBUNISTRING) $(LIBC32CONV).
--
* modules/argmatch (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/argmatch-tests (Makefile.am): Link test-argmatch with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/backup-rename (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/backupfile (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/human (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
--
* modules/sh-quote (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/sh-quote-tests (Makefile.am): Link test-sh-quote with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/system-quote (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/system-quote-tests (Makefile.am): Link test-system-quote-main
with $(LIBUNISTRING) $(LIBC32CONV).
* modules/csharpcomp (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/csharpexec (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/javacomp (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/javaexec (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
--
* modules/string-desc-quotearg (Link): New section.
* modules/string-desc-quotearg-tests (Makefile.am): Link
test-string-desc-quotearg with $(LIBUNISTRING) $(LIBC32CONV).
--
* modules/xmemcoll (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
--
* modules/closeout (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/readtokens-tests (Makefile.am): Link test-readtokens with
$(LIBUNISTRING) $(LIBC32CONV).
--
* modules/closein (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/closein-tests (Makefile.am): Link test-closein with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/yesno-tests (Makefile.am): Link test-yesno with
$(LIBUNISTRING) $(LIBC32CONV).
diff --git a/lib/quotearg.c b/lib/quotearg.c
index 975bd61dd0..c4133f10d6 100644
--- a/lib/quotearg.c
+++ b/lib/quotearg.c
@@ -41,8 +41,7 @@
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
-#include <wchar.h>
-#include <wctype.h>
+#include <uchar.h>
#include "gettext.h"
#define _(msgid) gettext (msgid)
@@ -535,7 +534,7 @@ quotearg_buffer_restyled (char *buffer, size_t buffersize,
case '`': case '|':
/* A shell special character. In theory, '$' and '`' could
be the first bytes of multibyte characters, which means
- we should check them with mbrtowc, but in practice this
+ we should check them with mbrtoc32, but in practice this
doesn't happen so it's not worth worrying about. */
if (quoting_style == shell_always_quoting_style
&& elide_outer_quotes)
@@ -620,9 +619,9 @@ quotearg_buffer_restyled (char *buffer, size_t buffersize,
do
{
- wchar_t w;
- size_t bytes = mbrtowc (&w, &arg[i + m],
- argsize - (i + m), &mbstate);
+ char32_t w;
+ size_t bytes = mbrtoc32 (&w, &arg[i + m],
+ argsize - (i + m), &mbstate);
if (bytes == 0)
break;
else if (bytes == (size_t) -1)
@@ -639,6 +638,8 @@ quotearg_buffer_restyled (char *buffer, size_t buffersize,
}
else
{
+ if (bytes == (size_t) -3)
+ bytes = 0;
/* Work around a bug with older shells that "see" a '\'
that is really the 2nd byte of a multibyte
character.
In practice the problem is limited to ASCII
@@ -659,7 +660,7 @@ quotearg_buffer_restyled (char *buffer, size_t buffersize,
}
}
- if (! iswprint (w))
+ if (! c32isprint (w))
printable = false;
m += bytes;
}
diff --git a/modules/acl b/modules/acl
index bcc1f4906c..2e410fbe6a 100644
--- a/modules/acl
+++ b/modules/acl
@@ -21,7 +21,9 @@ Include:
"acl.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
$(LIB_ACL)
$(QCOPY_ACL_LIB)
diff --git a/modules/acl-tests b/modules/acl-tests
index 2ee34c6523..7cb39e9758 100644
--- a/modules/acl-tests
+++ b/modules/acl-tests
@@ -25,6 +25,6 @@ TESTS += \
test-copy-acl.sh test-copy-acl-1.sh test-copy-acl-2.sh
TESTS_ENVIRONMENT += USE_ACL=$(USE_ACL)
check_PROGRAMS += test-set-mode-acl test-copy-acl test-sameacls
-test_set_mode_acl_LDADD = $(LDADD) $(LIB_ACL) @LIBINTL@ $(MBRTOWC_LIB)
-test_copy_acl_LDADD = $(LDADD) $(LIB_ACL) $(QCOPY_ACL_LIB) @LIBINTL@
$(MBRTOWC_LIB)
+test_set_mode_acl_LDADD = $(LDADD) $(LIB_ACL) $(LIBUNISTRING) @LIBINTL@
$(MBRTOWC_LIB) $(LIBC32CONV)
+test_copy_acl_LDADD = $(LDADD) $(LIB_ACL) $(QCOPY_ACL_LIB) $(LIBUNISTRING)
@LIBINTL@ $(MBRTOWC_LIB) $(LIBC32CONV)
test_sameacls_LDADD = $(LDADD) $(LIB_ACL) @LIBINTL@ $(MBRTOWC_LIB)
diff --git a/modules/argmatch b/modules/argmatch
index f07012644b..8b02b10b9d 100644
--- a/modules/argmatch
+++ b/modules/argmatch
@@ -27,7 +27,9 @@ Include:
"argmatch.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/argmatch-tests b/modules/argmatch-tests
index 2f70d491d2..11bce80102 100644
--- a/modules/argmatch-tests
+++ b/modules/argmatch-tests
@@ -9,5 +9,5 @@ configure.ac:
Makefile.am:
TESTS += test-argmatch
check_PROGRAMS += test-argmatch
-test_argmatch_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_argmatch_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@ $(MBRTOWC_LIB)
$(LIBC32CONV)
diff --git a/modules/backup-rename b/modules/backup-rename
index 6f6ab87a4b..b352d9aea7 100644
--- a/modules/backup-rename
+++ b/modules/backup-rename
@@ -36,7 +36,9 @@ Include:
"backupfile.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/backupfile b/modules/backupfile
index 08bf1d2526..b02cdc1cb1 100644
--- a/modules/backupfile
+++ b/modules/backupfile
@@ -37,7 +37,9 @@ Include:
"backupfile.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/closein b/modules/closein
index b5f3ce332f..42ff50d0fe 100644
--- a/modules/closein
+++ b/modules/closein
@@ -21,7 +21,9 @@ Include:
"closein.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/closein-tests b/modules/closein-tests
index d40156cb6d..189d09feed 100644
--- a/modules/closein-tests
+++ b/modules/closein-tests
@@ -12,4 +12,4 @@ configure.ac:
Makefile.am:
TESTS += test-closein.sh
check_PROGRAMS += test-closein
-test_closein_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_closein_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@ $(MBRTOWC_LIB)
$(LIBC32CONV)
diff --git a/modules/closeout b/modules/closeout
index 05f17957d9..b4ccefe443 100644
--- a/modules/closeout
+++ b/modules/closeout
@@ -23,7 +23,9 @@ Include:
"closeout.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/copy-file b/modules/copy-file
index a73e2a474c..231f31c8ed 100644
--- a/modules/copy-file
+++ b/modules/copy-file
@@ -38,7 +38,9 @@ Include:
Link:
$(LIB_ACL)
$(QCOPY_ACL_LIB)
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/copy-file-tests b/modules/copy-file-tests
index 087797c727..563cf95e33 100644
--- a/modules/copy-file-tests
+++ b/modules/copy-file-tests
@@ -18,4 +18,4 @@ Makefile.am:
TESTS += test-copy-file.sh test-copy-file-1.sh test-copy-file-2.sh
TESTS_ENVIRONMENT += USE_ACL=$(USE_ACL)
check_PROGRAMS += test-copy-file
-test_copy_file_LDADD = $(LDADD) $(LIB_ACL) $(QCOPY_ACL_LIB) $(CLOCK_TIME_LIB)
@LIBINTL@ $(MBRTOWC_LIB)
+test_copy_file_LDADD = $(LDADD) $(LIB_ACL) $(QCOPY_ACL_LIB) $(CLOCK_TIME_LIB)
$(LIBUNISTRING) @LIBINTL@ $(MBRTOWC_LIB) $(LIBC32CONV)
diff --git a/modules/csharpcomp b/modules/csharpcomp
index 244a802965..97783d67c2 100644
--- a/modules/csharpcomp
+++ b/modules/csharpcomp
@@ -28,7 +28,9 @@ Include:
"csharpcomp.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
$(LIBTHREAD)
License:
diff --git a/modules/csharpexec b/modules/csharpexec
index ee82df8dd9..cb30c938fb 100644
--- a/modules/csharpexec
+++ b/modules/csharpexec
@@ -28,7 +28,9 @@ Include:
"csharpexec.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
$(LIBTHREAD)
License:
diff --git a/modules/human b/modules/human
index a281fa4bf0..0c09f8206c 100644
--- a/modules/human
+++ b/modules/human
@@ -27,7 +27,9 @@ Include:
"human.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/javacomp b/modules/javacomp
index f3ce944100..d93cde52e3 100644
--- a/modules/javacomp
+++ b/modules/javacomp
@@ -43,7 +43,9 @@ Include:
"javacomp.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
$(GETRANDOM_LIB)
$(LIBTHREAD)
diff --git a/modules/javaexec b/modules/javaexec
index 4859e76254..e54dcffd22 100644
--- a/modules/javaexec
+++ b/modules/javaexec
@@ -29,7 +29,9 @@ Include:
"javaexec.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
$(LIBTHREAD)
License:
diff --git a/modules/quote b/modules/quote
index d9533a2de7..2b74111596 100644
--- a/modules/quote
+++ b/modules/quote
@@ -17,7 +17,9 @@ Include:
"quote.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/quotearg b/modules/quotearg
index db0903fa97..6e823fa9c6 100644
--- a/modules/quotearg
+++ b/modules/quotearg
@@ -5,16 +5,15 @@ Files:
lib/quotearg.h
lib/quotearg.c
lib/quote.h
-m4/mbstate_t.m4
-m4/mbrtowc.m4
m4/quotearg.m4
Depends-on:
attribute
c-strcaseeq
+c32isprint
extensions
gettext-h
-mbrtowc
+mbrtoc32
mbsinit
memcmp
minmax
@@ -22,8 +21,7 @@ quotearg-simple
localcharset
stdbool
stdint
-wchar
-wctype-h
+uchar
xalloc
configure.ac:
@@ -36,7 +34,9 @@ Include:
"quotearg.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/quotearg-simple b/modules/quotearg-simple
index 240192329a..e3d532defa 100644
--- a/modules/quotearg-simple
+++ b/modules/quotearg-simple
@@ -13,7 +13,9 @@ Makefile.am:
Include:
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/quotearg-simple-tests b/modules/quotearg-simple-tests
index 7f2f03f345..ba15ef2d4b 100644
--- a/modules/quotearg-simple-tests
+++ b/modules/quotearg-simple-tests
@@ -19,4 +19,4 @@ AC_CHECK_FUNCS_ONCE([mprotect])
Makefile.am:
TESTS += test-quotearg-simple
check_PROGRAMS += test-quotearg-simple
-test_quotearg_simple_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_quotearg_simple_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@ $(MBRTOWC_LIB)
$(LIBC32CONV)
diff --git a/modules/quotearg-tests b/modules/quotearg-tests
index 0ff8b4d402..d297f0b0aa 100644
--- a/modules/quotearg-tests
+++ b/modules/quotearg-tests
@@ -29,4 +29,4 @@ TESTS_ENVIRONMENT += \
LOCALE_FR='@LOCALE_FR@' LOCALE_FR_UTF8='@LOCALE_FR_UTF8@' \
host_os='@host_os@'
check_PROGRAMS += test-quotearg
-test_quotearg_LDADD = $(LDADD) $(SETLOCALE_LIB) @LIBINTL@ $(MBRTOWC_LIB)
+test_quotearg_LDADD = $(LDADD) $(SETLOCALE_LIB) $(LIBUNISTRING) @LIBINTL@
$(MBRTOWC_LIB) $(LIBC32CONV)
diff --git a/modules/readtokens-tests b/modules/readtokens-tests
index 1637125569..189cde252c 100644
--- a/modules/readtokens-tests
+++ b/modules/readtokens-tests
@@ -11,4 +11,4 @@ configure.ac:
Makefile.am:
TESTS += test-readtokens.sh
check_PROGRAMS += test-readtokens
-test_readtokens_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_readtokens_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@ $(MBRTOWC_LIB)
$(LIBC32CONV)
diff --git a/modules/sh-quote b/modules/sh-quote
index c3e23dc878..834601ba86 100644
--- a/modules/sh-quote
+++ b/modules/sh-quote
@@ -19,7 +19,9 @@ Include:
"sh-quote.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/sh-quote-tests b/modules/sh-quote-tests
index 1bded043f2..b2eccc58c7 100644
--- a/modules/sh-quote-tests
+++ b/modules/sh-quote-tests
@@ -8,4 +8,4 @@ configure.ac:
Makefile.am:
TESTS += test-sh-quote
check_PROGRAMS += test-sh-quote
-test_sh_quote_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_sh_quote_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@ $(MBRTOWC_LIB)
$(LIBC32CONV)
diff --git a/modules/string-desc-quotearg b/modules/string-desc-quotearg
index 17e0fa5abf..915859cf3d 100644
--- a/modules/string-desc-quotearg
+++ b/modules/string-desc-quotearg
@@ -18,6 +18,11 @@ lib_SOURCES += string-desc-quotearg.c
Include:
"string-desc-quotearg.h"
+Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
+$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
+
License:
GPL
diff --git a/modules/string-desc-quotearg-tests
b/modules/string-desc-quotearg-tests
index 2fa97ee4cb..04115df8ec 100644
--- a/modules/string-desc-quotearg-tests
+++ b/modules/string-desc-quotearg-tests
@@ -9,4 +9,4 @@ configure.ac:
Makefile.am:
TESTS += test-string-desc-quotearg
check_PROGRAMS += test-string-desc-quotearg
-test_string_desc_quotearg_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_string_desc_quotearg_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@
$(MBRTOWC_LIB) $(LIBC32CONV)
diff --git a/modules/system-quote b/modules/system-quote
index b1c860261b..cd933986a1 100644
--- a/modules/system-quote
+++ b/modules/system-quote
@@ -20,7 +20,9 @@ Include:
"system-quote.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/system-quote-tests b/modules/system-quote-tests
index e5850614f5..8ac3a67357 100644
--- a/modules/system-quote-tests
+++ b/modules/system-quote-tests
@@ -18,7 +18,7 @@ configure.ac:
Makefile.am:
TESTS += test-system-quote.sh
check_PROGRAMS += test-system-quote-main test-system-quote-child
-test_system_quote_main_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_system_quote_main_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@
$(MBRTOWC_LIB) $(LIBC32CONV)
# The test-system-quote-child program must be a real executable, not a libtool
# wrapper script, and should link against as few libraries as possible.
# Therefore don't link it against any libraries other than -lc.
diff --git a/modules/xmemcoll b/modules/xmemcoll
index 2ce12cc208..a8ff50bee6 100644
--- a/modules/xmemcoll
+++ b/modules/xmemcoll
@@ -22,7 +22,9 @@ Include:
"xmemcoll.h"
Link:
+$(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
$(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
License:
GPL
diff --git a/modules/yesno-tests b/modules/yesno-tests
index f66e068e00..9431c634f7 100644
--- a/modules/yesno-tests
+++ b/modules/yesno-tests
@@ -12,4 +12,4 @@ configure.ac:
Makefile.am:
TESTS += test-yesno.sh
check_PROGRAMS += test-yesno
-test_yesno_LDADD = $(LDADD) @LIBINTL@ $(MBRTOWC_LIB)
+test_yesno_LDADD = $(LDADD) $(LIBUNISTRING) @LIBINTL@ $(MBRTOWC_LIB)
$(LIBC32CONV)
- Re: From wchar_t to char32_t,
Bruno Haible <=