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Work around issues in MinGW-64's setjmp/longjmp support.

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It's hard to avoid the conclusion that there is something wrong with
setjmp/longjmp on MinGW-64, as we have seen failures come and go after
entirely-unrelated-looking changes in our own code.  Other projects
such as Ruby have given up and started using gcc's setjmp/longjmp
builtins on that platform; this patch just follows that lead.

Note that this is a pretty fundamental ABI break for functions
containining either setjmp or longjmp, so we can't really consider
a back-patch.

Per reports from Regina Obe and Heath Lord, as well as recent failures
on buildfarm member walleye, and less-recent failures on fairywren.

Juan José Santamaría Flecha

Discussion: https://postgr.es/m/000401d716a0$1ed0fc70$5c72f550$@pcorp.us
Discussion: https://postgr.es/m/CA+BEBhvHhM-Bn628pf-LsjqRh3Ang7qCSBG0Ga+7KwhGqrNUPw@mail.gmail.com
Discussion: https://postgr.es/m/f1caef93-9640-022e-9211-bbe8755a56b0@2ndQuadrant.com
This commit is contained in:
Tom Lane 2021-03-15 12:34:17 -04:00
parent eeb60e45d8
commit 146cb3889c
1 changed files with 10 additions and 3 deletions
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13
src/include/c.h
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@ -1335,14 +1335,21 @@ extern unsigned long long strtoull(const char *str, char **endptr, int base);
/* /*
* When there is no sigsetjmp, its functionality is provided by plain * When there is no sigsetjmp, its functionality is provided by plain
* setjmp. Incidentally, nothing provides setjmp's functionality in * setjmp. We now support the case only on Windows. However, it seems
* that case. We now support the case only on Windows. * that MinGW-64 has some longstanding issues in its setjmp support,
* so on that toolchain we cheat and use gcc's builtins.
*/ */
#ifdef WIN32 #ifdef WIN32
#ifdef __MINGW64__
typedef intptr_t sigjmp_buf[5];
#define sigsetjmp(x,y) __builtin_setjmp(x)
#define siglongjmp __builtin_longjmp
#else /* !__MINGW64__ */
#define sigjmp_buf jmp_buf #define sigjmp_buf jmp_buf
#define sigsetjmp(x,y) setjmp(x) #define sigsetjmp(x,y) setjmp(x)
#define siglongjmp longjmp #define siglongjmp longjmp
#endif #endif /* __MINGW64__ */
#endif /* WIN32 */
/* EXEC_BACKEND defines */ /* EXEC_BACKEND defines */
#ifdef EXEC_BACKEND #ifdef EXEC_BACKEND