Small problem in testsuite/27_io/basic_filebuf/overflow/wchar_t/11305-[1-4].cc

[Paolo Carlini]

Pétur Runólfsson wrote:

>Hi Paolo,
>
>There is a small problem in the test cases for PR 11305. After this change:
>
>-  wint_t n1 = fb.sputc(0x20000000);
>-  wint_t n2 = fb.sputc(0x40000000);
>+  wfilebuf::int_type n1 = fb.sputc(L'i');
>+  wfilebuf::int_type n2 = fb.sputc(L'a');
>
>the test cases will no longer detect the presence of the bug.
>
>The problem was that overflow failed to convert characters whose UTF-8
>representation is larger than sizeof(wchar_t); 0x20000000 and 0x40000000
>are two such characters (6 bytes each) but L'i' and L'a' only require a
>single byte each ('i' and 'a').
>  
>
Hummmm. However, for some reason the original testcase gave problems on 
64 bit platforms, like x86-64:

11305-1.exe: 
/usr/src/aj/cvs/gcc/libstdc++-v3/testsuite/27_io/basic_filebuf/overflow/wchar_t/11305-1.cc:38: 
void test01(): Assertion `n1 != (0xffffffffu)' failed.
FAIL: 27_io/basic_filebuf/overflow/wchar_t/11305-1.cc execution test

Any idea why?

We can try restoring only the sputc() argument of your original testcase 
and see what happens...

Paolo.