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In cpu_exec() we have a longstanding workaround for compilers which do not correctly implement the part of the sigsetjmp()/siglongjmp() spec which requires that local variables which are not changed between the setjmp and the longjmp retain their value. I recently ran across the upstream clang bug report for this; add a link to it to the comment describing the workaround, and generally expand the comment, so that we have a reasonable chance in future of understanding why it's there and determining when we can remove it, assuming clang eventually fixes the bug. Remove the /* buggy compiler */ comments on the #else and #endif: they don't add anything to understanding and are somewhat misleading since they're sandwiching the code path for *non*-buggy compilers. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20210129130330.30820-1-peter.maydell@linaro.org |
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