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| author |   Ionen Wolkens <ionen@gentoo.org> | 2024-08-12 17:22:22 -0400 |
|---|---|---|
| committer | Ionen Wolkens <ionen@gentoo.org> | 2024-08-12 21:25:51 -0400 |
| commit | ca034bbed6d34c7e87a013a35ac9d72f5f8dc040 (patch) | |
| tree | b0e8e625318f85db25bb4876379446f779990126 /dev-qt | |
| parent | dev-qt/qtbase: fix build with gcc15, incl. for revdeps (diff) | |
| download | gentoo-ca034bbed6d34c7e87a013a35ac9d72f5f8dc040.tar.gz gentoo-ca034bbed6d34c7e87a013a35ac9d72f5f8dc040.tar.bz2 gentoo-ca034bbed6d34c7e87a013a35ac9d72f5f8dc040.zip | |
dev-qt/qtbase: backport float16 fix for systems without sse2
Needs a revbump but it was done in previous commit at same
time for another reason.
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>
Diffstat (limited to 'dev-qt')
| -rw-r--r-- | dev-qt/qtbase/files/qtbase-6.7.2-float16-sse2.patch | 43 | ||||
| -rw-r--r-- | dev-qt/qtbase/qtbase-6.7.2-r2.ebuild | 1 |
2 files changed, 44 insertions, 0 deletions
diff --git a/dev-qt/qtbase/files/qtbase-6.7.2-float16-sse2.patch b/dev-qt/qtbase/files/qtbase-6.7.2-float16-sse2.patch new file mode 100644 index 000000000000..a54c9daa42b9 --- /dev/null +++ b/dev-qt/qtbase/files/qtbase-6.7.2-float16-sse2.patch @@ -0,0 +1,43 @@ +Backport from 6.7.3 as it may cause major problems for x86 sse2-less +systems using gcc14. + +https://github.com/qt/qtbase/commit/39fa7e7bef90be2940c5f736935f963e3969e0bd +From: Dmitry Shachnev <mitya57@gmail.com> +Date: Sat, 27 Jul 2024 23:03:07 +0300 +Subject: [PATCH] Use _Float16 only when SSE2 is enabled +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +The GCC documentation [1] says: “On x86 targets with SSE2 enabled, GCC +supports half-precision (16-bit) floating point via the _Float16 type”. + +On non-SSE2 x86 (such as Debian i386 baseline [2]), __FLT16_MAX__ is +defined starting with GCC 14 [3], however any non-trivial use of the +_Float16 type results in an error: + +error: operation not permitted on type ‘_Float16’ without option ‘-msse2’ + +which makes some packages fail to build on i386 architecture [4]. + +[1]: https://gcc.gnu.org/onlinedocs/gcc/Half-Precision.html +[2]: https://wiki.debian.org/ArchitectureSpecificsMemo#i386-1 +[3]: https://gcc.gnu.org/g:9a19fa8b616f83474c35cc5b34a3865073ced829 +[4]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1076986 +--- a/src/corelib/global/qtypes.h ++++ b/src/corelib/global/qtypes.h +@@ -264,11 +264,10 @@ + # define QFLOAT16_IS_NATIVE 1 + using NativeFloat16Type = decltype(__FLT16_MAX__); +-#elif defined(Q_CC_GNU_ONLY) && defined(__FLT16_MAX__) ++#elif defined(Q_CC_GNU_ONLY) && defined(__FLT16_MAX__) && defined(__ARM_FP16_FORMAT_IEEE) + # define QFLOAT16_IS_NATIVE 1 +-# ifdef __ARM_FP16_FORMAT_IEEE + using NativeFloat16Type = __fp16; +-# else ++#elif defined(Q_CC_GNU_ONLY) && defined(__FLT16_MAX__) && defined(__SSE2__) ++# define QFLOAT16_IS_NATIVE 1 + using NativeFloat16Type = _Float16; +-# endif + #else + # define QFLOAT16_IS_NATIVE 0 diff --git a/dev-qt/qtbase/qtbase-6.7.2-r2.ebuild b/dev-qt/qtbase/qtbase-6.7.2-r2.ebuild index 3b8705b716fd..68a5c8f9e4fa 100644 --- a/dev-qt/qtbase/qtbase-6.7.2-r2.ebuild +++ b/dev-qt/qtbase/qtbase-6.7.2-r2.ebuild @@ -147,6 +147,7 @@ PATCHES=( "${FILESDIR}"/${PN}-6.6.3-gcc14-avx512fp16.patch "${FILESDIR}"/${PN}-6.7.2-CVE-2024-39936.patch "${FILESDIR}"/${PN}-6.7.2-gcc15-odr.patch + "${FILESDIR}"/${PN}-6.7.2-float16-sse2.patch ) src_prepare() { |