Commit Graph

12 Commits

Author SHA1 Message Date
Rich Felker 9693501c15 change jmp_buf to share an underlying type and struct tag with sigjmp_buf
this is necessary to meet the C++ ABI target. alternatives were
considered to avoid the size increase for non-sig jmp_buf objects, but
they seemed to have worse properties. moreover, the relative size
increase is only extreme on x86[_64]; one way of interpreting this is
that, if the size increase from this patch makes jmp_buf use too much
memory, then the program was already using too much memory when built
for non-x86 archs.
2013-07-24 02:17:02 -04:00
rofl0r d84923d89e setjmp.h: add struct tag for sigjmp_buf (GCC C++ compatibility)
the anonymous struct typedef with array notation breaks with
GCC in C++ mode:

error: non-local function 'static<anonymous struct>
(& boost::signal_handler::jump_buffer())[1]' uses anonymous type

this is a known GCC issue, as search results for that error msg
suggest.

since this is hard to work around in the calling C++ code, a
fix in musl is preferable.
2013-01-04 20:36:34 +01:00
Rich Felker c1a9658bd1 default features: make musl usable without feature test macros
the old behavior of exposing nothing except plain ISO C can be
obtained by defining __STRICT_ANSI__ or using a compiler option (such
as -std=c99) that predefines it. the new default featureset is POSIX
with XSI plus _BSD_SOURCE. any explicit feature test macros will
inhibit the default.

installation docs have also been updated to reflect this change.
2012-09-07 23:13:55 -04:00
Rich Felker 0c05bd3a9c further use of _Noreturn, for non-plain-C functions
note that POSIX does not specify these functions as _Noreturn, because
POSIX is aligned with C99, not the new C11 standard. when POSIX is
eventually updated to C11, it will almost surely give these functions
the _Noreturn attribute. for now, the actual _Noreturn keyword is not
used anyway when compiling with a c99 compiler, which is what POSIX
requires; the GCC __attribute__ is used instead if it's available,
however.

in a few places, I've added infinite for loops at the end of _Noreturn
functions to silence compiler warnings. presumably
__buildin_unreachable could achieve the same thing, but it would only
work on newer GCCs and would not be portable. the loops should have
near-zero code size cost anyway.

like the previous _Noreturn commit, this one is based on patches
contributed by philomath.
2012-09-06 23:34:10 -04:00
Rich Felker c8ea985748 add _Noreturn function attribute, with fallback for pre-C11 GNUC 2012-09-06 23:12:27 -04:00
Rich Felker d646249124 fix wrong size for sigjmp_buf signal set array
128 is the size in bytes, not longs.
2012-07-22 18:58:35 -04:00
Rich Felker d6c0efe106 jmp_buf overhaul fixing several issues
on arm, the location of the saved-signal-mask flag and mask were off
by one between sigsetjmp and siglongjmp, causing incorrect behavior
restoring the signal mask. this is because the siglongjmp code assumed
an extra slot was in the non-sig jmp_buf for the flag, but arm did not
have this. now, the extra slot is removed for all archs since it was
useless.

also, arm eabi requires jmp_buf to have 8-byte alignment. we achieve
that using long long as the type rather than with non-portable gcc
attribute tags.
2012-07-03 20:07:33 -04:00
Rich Felker 25d575edc4 debloat jmp_buf in _GNU_SOURCE mode
i originally made it the same size as the bloated GNU version, which
contains space for saved signal mask, but this makes some structures
containing jmp_buf become much larger for no benefit. we will never
use the signal mask field with plain setjmp; sigsetjmp serves that
purpose.
2012-05-23 00:10:39 -04:00
Rich Felker 419ae6d5c9 support _BSD_SOURCE feature test macro
patch by Isaac Dunham. matched closely (maybe not exact) to glibc's
idea of what _BSD_SOURCE should make visible.
2012-05-22 21:52:08 -04:00
Rich Felker e8362c8b51 major bugfix for sigset_t (it was mistakenly 1024 bytes instead of bits)
note that object files using sigset_t (or struct sigaction) need to be
recompiled to work correctly after this fix.
2011-02-14 18:45:58 -05:00
Rich Felker 74eea628cf extensive header cleanup for standards conformance & correctness
thanks to Peter Mazinger (psm) for pointing many of these issues out
and submitting a patch on which this commit is loosely based
2011-02-14 18:41:25 -05:00
Rich Felker 0b44a0315b initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00