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Cygwin: suppress a warning generated with w32api >= 12.0.0

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w32api 12.0.0 adds the returns_twice attribute to RtlCaptureContext().
There's some data-flow interaction with using it inside a while loop
which causes a maybe-uninitialized warning.

../../../../winsup/cygwin/exceptions.cc: In member function 'int _cygtls::call_signal_handler()':
../../../../winsup/cygwin/exceptions.cc:1720:33: error: '<anonymous>' may be used uninitialized in this function [-Werror=maybe-uninitialized]

(cherry picked from commit 7e3c833592b282355a57dd34459b152e4e078d19)
This commit is contained in:
Jon Turney 2024-06-07 17:29:10 +01:00
parent 84dff09aa0
commit d1670f1e96
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winsup/cygwin/exceptions.cc
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@ -1717,7 +1717,10 @@ _cygtls::call_signal_handler ()
context, unwind to the caller and in case we're called
from sigdelayed, fix the instruction pointer accordingly. */
context.uc_mcontext.ctxflags = CONTEXT_FULL;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
RtlCaptureContext ((PCONTEXT) &context.uc_mcontext);
#pragma GCC diagnostic pop
__unwind_single_frame ((PCONTEXT) &context.uc_mcontext);
if (stackptr > stack)
{