riscv64 in armhf out

.github/workflows/flutter-engine-riscv64.yaml

@@ -57,6 +57,9 @@ jobs:
           PATCH_DIR=$PWD/patches
           cd flutter
           git apply $PATCH_DIR/0001-clang-toolchain.patch
+          git apply $PATCH_DIR/0003-gn-riscv32-and-riscv64.patch
+          git apply $PATCH_DIR/0005-fml-fixes-text_input-compiler-warnings.patch
+          git apply $PATCH_DIR/0006-impeller-unnecessary-virtual-specifier.patch
 
       - name: Build Debug
         working-directory: flutter/engine/src

patches/0003-gn-riscv32-and-riscv64.patch

@@ -0,0 +1,28 @@
+From 748e416e394552cac6e4be30112c3ef45d1c0ec3 Mon Sep 17 00:00:00 2001
+From: Joel Winarske <joel.winarske@gmail.com>
+Date: Tue, 6 Aug 2024 08:03:59 -0700
+Subject: [PATCH] gn riscv32 and riscv64
+
+Upstream-Status: Inappropriate
+
+Signed-off-by: Joel Winarske <joel.winarske@gmail.com>
+---
+ engine/src/flutter/tools/gn | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/engine/src/flutter/tools/gn b/engine/src/flutter/tools/gn
+index 0be76e5477..8fee233aed 100755
+--- a/engine/src/flutter/tools/gn
++++ b/engine/src/flutter/tools/gn
+@@ -1015,7 +1015,7 @@ def parse_args(args):
+   parser.add_argument('--web', action='store_true', default=False)
+   parser.add_argument('--windows', dest='target_os', action='store_const', const='win')
+
+-  parser.add_argument('--linux-cpu', type=str, choices=['x64', 'x86', 'arm64', 'arm'])
++  parser.add_argument('--linux-cpu', type=str, choices=['x64', 'x86', 'arm64', 'arm', 'riscv32', 'riscv64'])
+   parser.add_argument('--fuchsia-cpu', type=str, choices=['x64', 'arm64'], default='x64')
+   parser.add_argument('--windows-cpu', type=str, choices=['x64', 'arm64', 'x86'], default='x64')
+   parser.add_argument('--simulator-cpu', type=str, choices=['x64', 'arm64'], default='x64')
+-- 
+2.45.2
+

patches/0005-fml-fixes-text_input-compiler-warnings.patch

@@ -0,0 +1,76 @@
+From c7bb26a38b1d5988cc45a60091a70b5e87ac36ba Mon Sep 17 00:00:00 2001
+From: Joel Winarske <joel.winarske@gmail.com>
+Date: Mon, 10 Nov 2025 09:49:09 -0800
+Subject: [PATCH] [fml] fixes text_input compiler warnings
+
+Upstream-Status: Inappropriate
+
+Signed-off-by: Joel Winarske <joel.winarske@gmail.com>
+---
+ .../shell/platform/common/text_input_model.cc      | 14 +++++++-------
+ 1 file changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/engine/src/flutter/shell/platform/common/text_input_model.cc b/engine/src/flutter/shell/platform/common/text_input_model.cc
+index a21fe1ff3ef..ef807409dc1 100644
+--- a/engine/src/flutter/shell/platform/common/text_input_model.cc
++++ b/engine/src/flutter/shell/platform/common/text_input_model.cc
+@@ -157,7 +157,7 @@ bool TextInputModel::Backspace() {
+   // There is no selection. Delete the preceding codepoint.
+   size_t position = selection_.position();
+   if (position != editable_range().start()) {
+-    int count = IsTrailingSurrogate(text_.at(position - 1)) ? 2 : 1;
++    int count = IsTrailingSurrogate(static_cast<char32_t>(text_.at(position - 1))) ? 2 : 1;
+     text_.erase(position - count, count);
+     selection_ = TextRange(position - count);
+     if (composing_) {
+@@ -175,7 +175,7 @@ bool TextInputModel::Delete() {
+   // There is no selection. Delete the preceding codepoint.
+   size_t position = selection_.position();
+   if (position < editable_range().end()) {
+-    int count = IsLeadingSurrogate(text_.at(position)) ? 2 : 1;
++    int count = IsLeadingSurrogate(static_cast<char32_t>(text_.at(position))) ? 2 : 1;
+     text_.erase(position, count);
+     if (composing_) {
+       composing_range_.set_end(composing_range_.end() - count);
+@@ -196,17 +196,17 @@ bool TextInputModel::DeleteSurrounding(int offset_from_cursor, int count) {
+         count = i;
+         break;
+       }
+-      start -= IsTrailingSurrogate(text_.at(start - 1)) ? 2 : 1;
++      start -= IsTrailingSurrogate(static_cast<char32_t>(text_.at(start - 1))) ? 2 : 1;
+     }
+   } else {
+     for (int i = 0; i < offset_from_cursor && start != max_pos; i++) {
+-      start += IsLeadingSurrogate(text_.at(start)) ? 2 : 1;
++      start += IsLeadingSurrogate(static_cast<char32_t>(text_.at(start))) ? 2 : 1;
+     }
+   }
+
+   auto end = start;
+   for (int i = 0; i < count && end != max_pos; i++) {
+-    end += IsLeadingSurrogate(text_.at(start)) ? 2 : 1;
++    end += IsLeadingSurrogate(static_cast<char32_t>(text_.at(start))) ? 2 : 1;
+   }
+
+   if (start == end) {
+@@ -271,7 +271,7 @@ bool TextInputModel::MoveCursorForward() {
+   // Otherwise, move the cursor forward.
+   size_t position = selection_.position();
+   if (position != editable_range().end()) {
+-    int count = IsLeadingSurrogate(text_.at(position)) ? 2 : 1;
++    int count = IsLeadingSurrogate(static_cast<char32_t>(text_.at(position))) ? 2 : 1;
+     selection_ = TextRange(position + count);
+     return true;
+   }
+@@ -287,7 +287,7 @@ bool TextInputModel::MoveCursorBack() {
+   // Otherwise, move the cursor backward.
+   size_t position = selection_.position();
+   if (position != editable_range().start()) {
+-    int count = IsTrailingSurrogate(text_.at(position - 1)) ? 2 : 1;
++    int count = IsTrailingSurrogate(static_cast<char32_t>(text_.at(position - 1))) ? 2 : 1;
+     selection_ = TextRange(position - count);
+     return true;
+   }
+-- 
+2.51.1
+