build

This reverts commit f0ffc497a8.

src/android/app/build.gradle.kts

@@ -259,7 +259,7 @@ android {
 
     externalNativeBuild {
         cmake {
-            version = "3.31.6"
+            version = "3.31.5"
             path = file("${edenDir}/CMakeLists.txt")
         }
     }

src/core/arm/nce/arm_nce_asm_definitions.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /* SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project */
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
@@ -5,9 +8,22 @@
 
 #define __ASSEMBLY__
 
+// Newer Linux UAPI headers check __ASSEMBLER__ instead of __ASSEMBLY__ to hide C declarations.
+// Without it, asm-generic/signal.h redeclares sigset_t and clashes with glibc's. Only define it
+// around these includes, since glibc headers also look at __ASSEMBLER__.
+#ifndef __ASSEMBLER__
+#define __ASSEMBLER__
+#define EDEN_NCE_UNDEF_ASSEMBLER
+#endif
+
 #include <asm-generic/signal.h>
 #include <asm-generic/unistd.h>
 
+#ifdef EDEN_NCE_UNDEF_ASSEMBLER
+#undef __ASSEMBLER__
+#undef EDEN_NCE_UNDEF_ASSEMBLER
+#endif
+
 #define ReturnToRunCodeByExceptionLevelChangeSignal SIGUSR2
 #define BreakFromRunCodeSignal SIGURG
 #define GuestAccessFaultSignal SIGSEGV

src/core/hle/service/nvnflinger/hardware_composer.cpp

@@ -57,8 +57,21 @@ u32 HardwareComposer::ComposeLocked(f32* out_speed_scale, Display& display,
     // Set default speed limit to 100%.
     *out_speed_scale = 1.0f;
 
+    // If no layers are visible, skip the logic. Acquiring and holding buffers here would
+    // consume the producer's queue without ever presenting.
+    bool any_visible = false;
+    for (auto& layer : display.stack.layers) {
+        if (layer->visible) {
+            any_visible = true;
+            break;
+        }
+    }
+    if (!any_visible) {
+        return 1;
+    }
+
+    // Wait for the previous composite, bounding the number of in-flight composites.
     nvdisp.WaitForComposite();
-    this->ReleaseFramebuffersLocked(display);
 
     // Determine the number of vsync periods to wait before composing again.
     std::optional<s32> swap_interval{};
@@ -152,6 +165,13 @@ u32 HardwareComposer::ComposeLocked(f32* out_speed_scale, Display& display,
     // Advance by 1 frame (60 FPS compositing)
     m_frame_number += 1;
 
+    // Release framebuffers once the frame has been handed to the compositor. This happens
+    // within the same vsync period as the acquire (release_frame_number is checked against
+    // the advanced counter), so the producer gets its buffers back immediately instead of
+    // losing a queue slot for a whole frame.
+    // TODO: support release fences; releasing before the composite has finished can tear.
+    this->ReleaseFramebuffersLocked(display);
+
     return 1;
 }