The __builtin_bswapXX from GCC and Clang are preferred when
they are available. This can allow compilers to emit the x86 MOVBE
instruction instead of doing a load + byteswap as two instructions
(which would happen if the byteswapping is done in inline asm).
bswap16, bswap32, and bswap64 exist in system headers on *BSDs
and Darwin. #defining bswap16 on NetBSD results in a warning about
macro redefinition. It's safest to avoid this namespace conflict
completely.
No OS supported by tuklib_integer.h uses byteswapXX names and
a web search doesn't immediately find any obvious danger of
namespace conflicts. So let's try these still-pretty-short names
for the macros.
Thanks to Sam James for pointing out the compiler warning on
NetBSD 10.0.
(cherry picked from commit 4ffc60f323)
The API docs clearly say that if error_pos isn't NULL then *error
is always set on any error. However, it wasn't touched if str == NULL
or filters == NULL or unsupported flags were specified.
Fixes: cedeeca2ea
(cherry picked from commit 70d12dd069)
The array could become empty and then the initializer would be
simply {} which is allowed only in GNU-C and C23.
(cherry picked from commit b101e1d1db)
It is logical why it cannot know for sure that the value has
to be at most 4 if it is less than 16.
The x86 filter is based on a very old LZMA SDK version. Newer
ones have quite a different implementation for the same filter.
Thanks to Sam James.
(cherry picked from commit 6aa2a6deeb)
On macOS, we get:
```
signals.c: In function 'signals_init':
signals.c:76:17: error: conversion to 'sigset_t' {aka 'unsigned int'} from 'int' may change the sign of the result [-Werror=sign-conversion]
76 | sigaddset(&hooked_signals, sigs[i]);
| ^~~~~~~~~
signals.c:81:17: error: conversion to 'sigset_t' {aka 'unsigned int'} from 'int' may change the sign of the result [-Werror=sign-conversion]
81 | sigaddset(&hooked_signals, message_progress_sigs[i]);
| ^~~~~~~~~
signals.c:86:9: error: conversion to 'sigset_t' {aka 'unsigned int'} from 'int' may change the sign of the result [-Werror=sign-conversion]
86 | sigaddset(&hooked_signals, SIGTSTP);
| ^~~~~~~~~
```
We use `int` for `hooked_signals` but we can't just cast to whatever
`sigset_t` is because `sigset_t` is an opaque type. It's an unsigned int
on macOS. On macOS, `sigaddset` is implemented as a macro.
Just suppress -Wsign-conversion for `signals_init` for macOS given
there's no real nice way of fixing this.
(cherry picked from commit 863f13d282)
A few lines were reordered, a few ARRAY_SIZE were changed to sizeof,
and a few uint32_t were changed to size_t. No real functional changes
were intended.
(cherry picked from commit 0fe2dfa683)
We discussed the name and it's less cognitive load to just call it '.bash'
so you don't have an immediate question about if bashisms are OK.
(cherry picked from commit 73f629e321)
We need this for when we're passing sanitizer flags or -gdwarf-4 for Clang
with Valgrind. Just always start with -O2 if CFLAGS isn't set in the
environment and append what was passed on the command line.
(cherry picked from commit 65bf7e0a1c)
Unfortunately, UBSAN doesn't do this by default. See also the change
I made in Meson for this in October [0].
[0] 7b7d2e060b
(cherry picked from commit b5e3470442)
Using `--trace-children=yes` has a trade-off here, as it makes
`test_scripts.sh` pretty slow when calling various non-xz utilities.
But I also feel like it's not useless to have Valgrind used there and it's
not easy to exclude Valgrind just for that one test...
I did consider using AX_VALGRIND_CHECK [0][1] but I couldn't get it working
immediately with some conditionally-built tests and I wondered if it was
worth spending time on at least while we're debating xz's future build
system situation.
[0] https://www.gnu.org/software/autoconf-archive/ax_valgrind_check.html
[1] https://tecnocode.co.uk/2014/12/23/automatically-valgrinding-code-with-ax_valgrind_check/
(cherry picked from commit 6c095a98fb)
A macro is useful to prevent a single #if directive from
getting too ugly but only one macro is needed for all archs.
(cherry picked from commit 6286c1900c)
This is *NOT* done for security reasons even though the backdoor
relied on the ifunc code. Instead, the reason is that in this
project ifunc provides little benefits but it's quite a bit of
extra code to support it. The only case where ifunc *might* matter
for performance is if the CRC functions are used directly by an
application. In normal compression use it's completely irrelevant.
(cherry picked from commit 689ae24273)
Sam James
Lasse Collin
Ryan Carsten Schmidt