| Age | Commit message (Collapse) | Author | Lines |
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| 2021年02月22日 | guard against compilers failing to handle setjmp specially by default | Rich Felker | -3/+11 |
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since 4.1, gcc has had the __returns_twice__ attribute and has
required functions which return twice to carry it; however it's always
applied it automatically to known setjmp-like function names. clang
however does not do this reliably, at least not with -ffreestanding
and possibly under other conditions, resulting in silent emission of
wrong code.
since the symbol name setjmp is in no way special (setjmp is specified
as a macro that could expand to use any implementation-specific symbol
name or names), a compiler is justified not to do anything special
without further hints, and it's reasonable to do what we can to
provide such hints.
gcc 4.0.x and earlier do not recognize the attribute, so make use
conditional on __GNUC__ macros. clang and other gcc-like compilers
report (and have always reported) a later "GNUC" version so the
preprocessor conditional should function as desired for them as too.
undefine the internal macro after use so that nothing abuses it as a
public feature.
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| 2015年04月01日 | remove macro definition of longjmp from setjmp.h | Rich Felker | -1/+0 |
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the C standard specifies that setjmp is a macro, but longjmp is a
normal function. a macro version of it would be permitted (albeit
useless) for C (not C++), but would have to be a function-like macro,
not an object-like one.
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| 2013年07月24日 | change jmp_buf to share an underlying type and struct tag with sigjmp_buf | Rich Felker | -7/+6 |
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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.
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| 2013年01月04日 | setjmp.h: add struct tag for sigjmp_buf (GCC C++ compatibility) | rofl0r | -1/+1 |
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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.
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| 2012年09月07日 | default features: make musl usable without feature test macros | Rich Felker | -6/+1 |
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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.
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| 2012年09月06日 | further use of _Noreturn, for non-plain-C functions | Rich Felker | -2/+2 |
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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.
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| 2012年09月06日 | add _Noreturn function attribute, with fallback for pre-C11 GNUC | Rich Felker | -1/+8 |
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| 2012年07月22日 | fix wrong size for sigjmp_buf signal set array | Rich Felker | -1/+1 |
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128 is the size in bytes, not longs.
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| 2012年07月03日 | jmp_buf overhaul fixing several issues | Rich Felker | -1/+5 |
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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.
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| 2012年05月23日 | debloat jmp_buf in _GNU_SOURCE mode | Rich Felker | -3/+0 |
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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.
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| 2012年05月22日 | support _BSD_SOURCE feature test macro | Rich Felker | -2/+4 |
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patch by Isaac Dunham. matched closely (maybe not exact) to glibc's
idea of what _BSD_SOURCE should make visible.
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| 2011年02月14日 | major bugfix for sigset_t (it was mistakenly 1024 bytes instead of bits) | Rich Felker | -1/+1 |
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note that object files using sigset_t (or struct sigaction) need to be
recompiled to work correctly after this fix.
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| 2011年02月14日 | extensive header cleanup for standards conformance & correctness | Rich Felker | -5/+13 |
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thanks to Peter Mazinger (psm) for pointing many of these issues out
and submitting a patch on which this commit is loosely based
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| 2011年02月12日 | initial check-in, version 0.5.0 v0.5.0 | Rich Felker | -0/+30 |
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