[Patch/RFC] libstdc++/9024

[Paolo Carlini]

Hi everyone, hi Benjamin.

This PR is about the effect of pubsetbuf(0, 0): in the
current code, being M_buf_size_opt set to zero, a next open
doesn't allocate at all an internal buffer.

This seems not correct when the 'in' openmode flag is true.

Is the fix below the right approach? I have positively
tested it on x86-linux, as usual.

Paolo.

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