On Tue, 6 May 2025, Martin Storsjö wrote:
On Thu, 17 Apr 2025, Pali Rohár wrote:
There is missing call _configthreadlocale(-1) in pre_c_init function.
Startup code from Visual C++ runtime is doing same thing.
This applies only for msvcr80+ and UCRT builds. For older msvcrt versions
there is only empty wrapper.
---
mingw-w64-crt/crt/crtexe.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mingw-w64-crt/crt/crtexe.c b/mingw-w64-crt/crt/crtexe.c
index 4bc8a92f497a..6da7e23fba92 100644
--- a/mingw-w64-crt/crt/crtexe.c
+++ b/mingw-w64-crt/crt/crtexe.c
@@ -112,6 +112,7 @@ pre_c_init (void)
if (__globallocalestatus == -1)
{
+ _configthreadlocale(-1);
What is the parameter -1 here?
According to the docs, we can pass _ENABLE_PER_THREAD_LOCALE (1) or
_DISABLE_PER_THREAD_LOCALE (2), or 0 to query the current setting. But the
docs don't say anything about passing -1 as parameter.
Also secondly; does this ever get called here?
This only gets called if we have __globallocalestatus == -1, but
__globallocalestatus is initialized to ~0x1 (== -2) in crt/xthdloc.c. I
don't see any code changing it, other than if user could would do it (the
variable is declared in ctype.h and mbctype.h, but it seems very much
internal/undocumented). Is this something where MSVC has a better
user-facing way of configuring it, while our CRT has some remnants of
something similar, but which is essentially impossible to use in its
current form?
// Martin
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