[glibc] wchar: Define va_list for POSIX (BZ #30035)

[glibc] wchar: Define va_list for POSIX (BZ #30035)

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a363f7075125fa654342c69331e6c075518ec28c

commit a363f7075125fa654342c69331e6c075518ec28c
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon Jan 23 13:59:31 2023 -0300

    wchar: Define va_list for POSIX (BZ #30035)
    
    This was uncovered by a recent clang change [1].  Different than ISO C,
    POSIX states that va_list should be exported by wchar.h [2].
    
    Checked on x86_64-linux-gnu and aarch64-linux-gnu.
    
    [1] https://reviews.llvm.org/D137268
    [2] https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/basedefs/wchar.h.html

Diff:
---
 conform/data/wchar.h-data | 17 +++++++++++------
 wcsmbs/wchar.h            | 11 +++++++++++
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/conform/data/wchar.h-data b/conform/data/wchar.h-data
index e414651a33..243321090d 100644
--- a/conform/data/wchar.h-data
+++ b/conform/data/wchar.h-data
@@ -15,6 +15,11 @@ type size_t
 type locale_t
 # endif
 tag {struct tm}
+# if !defined ISO99 && !defined ISO11 && !defined UNIX98
+type va_list
+# else
+#  define va_list __gnuc_va_list
+# endif
 
 function wint_t btowc (int)
 function int fwprintf (FILE*, const wchar_t*, ...)
@@ -59,17 +64,17 @@ function wint_t towlower (wint_t)
 function wint_t towupper (wint_t)
 # endif
 function wint_t ungetwc (wint_t, FILE*)
-function int vfwprintf (FILE*, const wchar_t*, __gnuc_va_list)
+function int vfwprintf (FILE*, const wchar_t*, va_list)
 # ifndef UNIX98
-function int vfwscanf (FILE*, const wchar_t*, __gnuc_va_list)
+function int vfwscanf (FILE*, const wchar_t*, va_list)
 # endif
-function int vwprintf (const wchar_t*, __gnuc_va_list)
+function int vwprintf (const wchar_t*, va_list)
 # ifndef UNIX98
-function int vwscanf (const wchar_t*, __gnuc_va_list)
+function int vwscanf (const wchar_t*, va_list)
 # endif
-function int vswprintf (wchar_t*, size_t, const wchar_t*, __gnuc_va_list)
+function int vswprintf (wchar_t*, size_t, const wchar_t*, va_list)
 # ifndef UNIX98
-function int vswscanf (const wchar_t*, const wchar_t*, __gnuc_va_list)
+function int vswscanf (const wchar_t*, const wchar_t*, va_list)
 # endif
 # if defined XOPEN2K8 || defined POSIX2008
 function {wchar_t*} wcpcpy (wchar_t*, const wchar_t*)
diff --git a/wcsmbs/wchar.h b/wcsmbs/wchar.h
index acc2eb9ddf..d16f2e6951 100644
--- a/wcsmbs/wchar.h
+++ b/wcsmbs/wchar.h
@@ -37,6 +37,17 @@
 #define __need___va_list
 #include <stdarg.h>
 
+#if defined __USE_XOPEN2K || defined __USE_XOPEN2K8
+# ifdef __GNUC__
+#  ifndef _VA_LIST_DEFINED
+typedef __gnuc_va_list va_list;
+#   define _VA_LIST_DEFINED
+#  endif
+# else
+#  include <stdarg.h>
+# endif
+#endif
+
 #include <bits/wchar.h>
 #include <bits/types/wint_t.h>
 #include <bits/types/mbstate_t.h>