Hi Kai,
you may take notice of some inconsistent behaviour. The master thread
starts with extended precision. Newly created threads start with the MSVC
standard double precision.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=761175
#include <pthread.h>
#include <stdio.h>
void *thread_fun(void *x_void_ptr)
{
printf("thread\n");
return NULL;
}
int main()
{
pthread_t thread;
if(pthread_create(&thread, NULL, thread_fun, NULL)) {
fprintf(stderr, "Error creating thread\n");
return 1;
}
if(pthread_join(thread, NULL)) {
fprintf(stderr, "Error joining thread\n");
return 2;
}
return 0;
}
// (gdb) break main
// Breakpoint 1 at 0x40157c
// (gdb) break thread_fun
// Breakpoint 2 at 0x401566
// (gdb) r
// Starting program: a.exe
// [New Thread 5832.0x7c8]
//
// Breakpoint 1, 0x0040157c in main ()
// (gdb) p $fctrl
// $1 = 895
// (gdb) c
// Continuing.
// [New Thread 5832.0xf10]
// [Switching to Thread 5832.0xf10]
//
// Breakpoint 2, 0x00401566 in thread_fun ()
// (gdb) p $fctrl
// $2 = 639
// (gdb) c
Is there a way to get around of this?
2014-11-24 21:30 GMT+01:00 Kai Tietz <ktiet...@googlemail.com>:
> Hello,
>
> so from my POV decision is already made. 80-bit support is wanted,
> and needs to be active for being compatible with C99-math and
> testsuites and gcc for Windows. This support for 64-bit goes back to
> 2005, and for 32-bit even much earlier (1998 ?).
> We provide a way for users asking explicit for 64-bit precision by
> different object-files, as already noted in this thread (CRT_fp8,
> CRT_fp10,...). This is the same as for txtmode.o vs. binmode.o, or
> CRT_noglob.o vs. CRT_glob.o changing behavior.
>
> Nevertheless I would welcome if someone would contribute a good page
> on our Wiki FAQ-section.
>
> Regards,
> Kai
>
>
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