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build: Clang 10.0.1

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LLVM 8 has inherent nondeterminism in the compiler, fixed in LLVM 9+.
pull/944/head
Hennadii Stepanov 4 years ago committed by Loshan T
parent 9f39f07f31
commit 70b6355414
3 changed files with 5 additions and 70 deletions
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10
depends/packages/native_clang.mk
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@ -1,9 +1,9 @@
package=native_clang
$(package)_version=8.0.0
$(package)_download_path=https://releases.llvm.org/$($(package)_version)
$(package)_download_file=clang+llvm-$($(package)_version)-x86_64-linux-gnu-ubuntu-14.04.tar.xz
$(package)_file_name=clang-llvm-$($(package)_version)-x86_64-linux-gnu-ubuntu-14.04.tar.xz
$(package)_sha256_hash=9ef854b71949f825362a119bf2597f744836cb571131ae6b721cd102ffea8cd0
$(package)_version=10.0.1
$(package)_download_path=https://github.com/llvm/llvm-project/releases/download/llvmorg-$($(package)_version)
$(package)_download_file=clang+llvm-$($(package)_version)-x86_64-linux-gnu-ubuntu-16.04.tar.xz
$(package)_file_name=clang+llvm-$($(package)_version)-x86_64-linux-gnu-ubuntu-16.04.tar.xz
$(package)_sha256_hash=48b83ef827ac2c213d5b64f5ad7ed082c8bcb712b46644e0dc5045c6f462c231
define $(package)_preprocess_cmds
rm -f $($(package)_extract_dir)/lib/libc++abi.so*

2
depends/packages/qt.mk
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@ -12,7 +12,6 @@ $(package)_patches=fix_qt_pkgconfig.patch mac-qmake.conf fix_configure_mac.patch
$(package)_patches+= fix_rcc_determinism.patch fix_riscv64_arch.patch xkb-default.patch no-xlib.patch
$(package)_patches+= fix_android_qmake_conf.patch fix_android_jni_static.patch dont_hardcode_pwd.patch
$(package)_patches+= freetype_back_compat.patch drop_lrelease_dependency.patch fix_powerpc_libpng.patch
$(package)_patches+= fix_qpainter_non_determinism.patch
# Update OSX_QT_TRANSLATIONS when this is updated
$(package)_qttranslations_file_name=qttranslations-$($(package)_suffix)
@ -196,7 +195,6 @@ endef
define $(package)_preprocess_cmds
patch -p1 -i $($(package)_patch_dir)/freetype_back_compat.patch && \
patch -p1 -i $($(package)_patch_dir)/fix_powerpc_libpng.patch && \
patch -p1 -i $($(package)_patch_dir)/fix_qpainter_non_determinism.patch &&\
sed -i.old "s|updateqm.commands = \$$$$\$$$$LRELEASE|updateqm.commands = $($(package)_extract_dir)/qttools/bin/lrelease|" qttranslations/translations/translations.pro && \
patch -p1 -i $($(package)_patch_dir)/drop_lrelease_dependency.patch && \
patch -p1 -i $($(package)_patch_dir)/dont_hardcode_pwd.patch &&\

63
depends/patches/qt/fix_qpainter_non_determinism.patch
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@ -1,63 +0,0 @@
commit 2a8f7dc6ddfc414a66491522501c1574a1343ee1
Author: Andrew Chow <achow101-github@achow101.com>
Date: Sat Nov 21 01:11:04 2020 -0500
build: Fix determinism issue when building with Clang 8
When building Qt with LLVM/Clang 8 under -O3 (the default), we run into
a determinism issue in `qt_interset_spans`. The issue has been fixed for
LLVM/Clang 9, see
https://github.com/llvm/llvm-project/commit/db101864bdc938deb1d63fe4f7da761bd38e5cae
and https://reviews.llvm.org/D64601, however this fix was not backported
to 8.x. Once LLVM/Clang 9 is used, this patch can be dropped.
The particular issue appears to be an optimization done by -O3 which
adds a temporary variable for `spans->y` in `qt_intersect_spans`. When
it does this, sometimes it chooses to use a 32-bit movs instruction
(movswl), and other times it chooses a 64-bit movs instruction (movswq).
By patching `qt_intersect_spans` to always make a temporary variable for
`spans->y`, we are able to sidestep this problem.
diff --git a/qtbase/src/gui/painting/qpaintengine_raster.cpp b/qtbase/src/gui/painting/qpaintengine_raster.cpp
index 92ab6e8375..f018009e0b 100644
--- a/qtbase/src/gui/painting/qpaintengine_raster.cpp
+++ b/qtbase/src/gui/painting/qpaintengine_raster.cpp
@@ -3971,22 +3971,23 @@ static const QSpan *qt_intersect_spans(const QClipData *clip, int *currentClip,
const QSpan *clipEnd = clip->m_spans + clip->count;
while (available && spans < end ) {
+ const short spans_y = spans->y;
if (clipSpans >= clipEnd) {
spans = end;
break;
}
- if (clipSpans->y > spans->y) {
+ if (clipSpans->y > spans_y) {
++spans;
continue;
}
- if (spans->y != clipSpans->y) {
- if (spans->y < clip->count && clip->m_clipLines[spans->y].spans)
- clipSpans = clip->m_clipLines[spans->y].spans;
+ if (spans_y != clipSpans->y) {
+ if (spans_y < clip->count && clip->m_clipLines[spans_y].spans)
+ clipSpans = clip->m_clipLines[spans_y].spans;
else
++clipSpans;
continue;
}
- Q_ASSERT(spans->y == clipSpans->y);
+ Q_ASSERT(spans_y == clipSpans->y);
int sx1 = spans->x;
int sx2 = sx1 + spans->len;
@@ -4005,7 +4006,7 @@ static const QSpan *qt_intersect_spans(const QClipData *clip, int *currentClip,
if (len) {
out->x = qMax(sx1, cx1);
out->len = qMin(sx2, cx2) - out->x;
- out->y = spans->y;
+ out->y = spans_y;
out->coverage = qt_div_255(spans->coverage * clipSpans->coverage);
++out;
--available;
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