Bug#948490: gcc-9: -std=c11 prevents the use of decimal FP
On 09.01.20 14:24, Vincent Lefevre wrote:
> Package: gcc-9
> Version: 9.2.1-22
> Severity: normal
>
> The -std=c11 option (or other versions of the C standard) prevents
> the use of decimal FP:
>
> $ cat tst.c
> int main (void)
> {
> _Decimal64 x = 1;
> return x != 1;
> }
> $ gcc-9 tst.c -o tst
> $ gcc-9 -std=c11 tst.c -o tst
> tst.c: In function ‘main’:
> tst.c:3:3: error: unknown type name ‘_Decimal64’
> 3 | _Decimal64 x = 1;
> | ^~~~~~~~~~
>
> There is no such issue with gcc-snapshot (_Decimal64 is not a
> forbidden extension):
>
> $ gcc-snapshot -std=c11 tst.c -o tst
> $ gcc-snapshot -std=c11 -pedantic tst.c -o tst
> tst.c: In function 'main':
> tst.c:3:3: warning: ISO C does not support decimal floating-point before C2X [-Wpedantic]
> 3 | _Decimal64 x = 1;
> | ^~~~~~~~~~
>
> The GCC 9.2.0 manual does not mention a possible limitation.
please could you recheck with trunk, and report that upstream?
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