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Auto merge of #378 - thomaslee:tom_fix_kfreebsd, r=badboy 

Fix strerror_r on some esoteric platforms

Defining _XOPEN_SOURCE=1 causes strange behavior on Debian kfreebsd archs -- i.e. the GNU userspace with FreeBSD kernel -- when _GNU_SOURCE is not defined (the default).

Not sure I fully understand the bizarre semantics, but it seems to use the XSI-compliant interface (int strerror_r(int, char*, size_t)) but the GNU implementation (char *strerror_r(int, char*, size_t)) such that strerror_r returns 32-bits of a 64-bit char * on x86_64 kfreebsd. We would expect strerror_r to return zero when using the XSI-compliant strerror_r implementation or a 64-bit char* when using the GNU version. Instead, we get something in between!

Unless I'm missing something, being more explicit about what version of _XOPEN_SOURCE we want seems to be the prudent thing to do here -- and if folks want the GNU implementation of strerror_r for some reason they can always -D_GNU_SOURCE explicitly.
This commit is contained in:
not-a-robot 2016-05-12 09:44:47 +02:00
parent 8ef4c472f8 bb1747b1bf
commit e93c05a7aa
1 changed files with 1 additions and 3 deletions
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4
fmacros.h
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@ -12,10 +12,8 @@
#if defined(__sun__)
#define _POSIX_C_SOURCE 200112L
#elif defined(__linux__) || defined(__OpenBSD__) || defined(__NetBSD__)
#define _XOPEN_SOURCE 600
#else
#define _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif
#if defined(__APPLE__) && defined(__MACH__)