On Wednesday 25 June 2025 22:06:22 LIU Hao wrote: > 在 2025-6-25 06:29, Pali Rohár 写道: > > Format %c and %s when used in some wide wprintf function takes the wide > > wchar_t char or wide wchar_t* string. This is msvcrt.dll and UCRT behavior. > > > > This change aligns the mingw-w64 wprintf functions to be compatible with MS. > > --- > > mingw-w64-crt/stdio/mingw_pformat.c | 12 ++++++++++-- > > 1 file changed, 10 insertions(+), 2 deletions(-) > > > > The mingw-w64 printf functions have C99 behavior for many years. Given the > quantity of users who have been used to that, I don't think there's enough > reason to make a change.
That is a valid point and I would understand if these changes would not be accepted. That makes sense. But I would like to point out that we have already this ms vs c99 inconsistency between msvcrt and ucrt builds. And something should be improved here. When -std=c99 is specified then for msvcrt is used the C99 behavior and for UCRT is used ms behavior. That is because -std=c99 for msvcrt uses mingw-w64 printf and for UCRT it uses printf from ucrt library which is not c99 compatible. I do not think that having this inconsistency is a good idea. One proposal from my side: Add support for UCRT compile time macros _CRT_STDIO_ISO_WIDE_SPECIFIERS and _CRT_STDIO_LEGACY_WIDE_SPECIFIERS by which application can decide if wants C99 behavior or MS behavior. We can provide two mingw-w64 wide print functions and our stdio.h can redirect via __MINGW_ASM_CALL() to correct function based on those macros. And maybe we can predefine _CRT_STDIO_ISO_WIDE_SPECIFIERS if the -std=c99 or -std=c11 or new is explicitly specified when application or user wants ISO C compliant behavior. For example there are some "features" of ISO C lang (e.g. digraphs) which are not enabled by -std=gnu99, but are enabled by -std=c99. Maybe we can do similar thing for wide printf functions? Just an idea. > > > Format %c and %s when used in some wide wprintf function takes the wide > \-------------------------------------/ > \-------v------/ ^ > \------------------------------------------------/ > > nitpicking: take > > > > -- > Best regards, > LIU Hao _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
