build: Clang 10.0.1

LLVM 8 has inherent nondeterminism in the compiler, fixed in LLVM 9+.

1 files changed, 0 insertions, 63 deletions

diff --git a/depends/patches/qt/fix_qpainter_non_determinism.patch b/depends/patches/qt/fix_qpainter_non_determinism.patch
deleted file mode 100644
index 44c45187c5..0000000000
--- a/depends/patches/qt/fix_qpainter_non_determinism.patch
+++ /dev/null
@@ -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
-@@ -4128,22 +4128,23 @@ 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;
-@@ -4162,7 +4163,7 @@ 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;
-