Also, let's run it on CI.

.github/workflows/build.yml

@@ -232,6 +232,13 @@ jobs:
           args: make -C libretro -f Makefile -j2
           id: clang-libretro
 
+        - os: ubuntu-latest
+          extra: loongarch64
+          cc: gcc
+          cxx: g++
+          args: ./b.sh --loongarch64 PPSSPPHeadless
+          id: loongarch64
+
         - os: macos-latest
           extra: test
           cc: clang
@@ -278,12 +285,19 @@ jobs:
         ndk-version: r21e
 
     - name: Install Linux dependencies
-      if: runner.os == 'Linux' && matrix.extra != 'android'
+      if: runner.os == 'Linux' && matrix.extra != 'android' && matrix.extra != 'loongarch64'
       run: |
         sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) main universe restricted multiverse"
         sudo apt-get update -y -qq
         sudo apt-get install libsdl2-dev libgl1-mesa-dev libglu1-mesa-dev libsdl2-ttf-dev libfontconfig1-dev
 
+    - name: Install loongarch64 cross-compilation dependencies
+      if: matrix.extra == 'loongarch64'
+      run: |
+        sudo apt-get update -y -qq
+        sudo apt-get install -y gcc-14-loongarch64-linux-gnu g++-14-loongarch64-linux-gnu binutils-loongarch64-linux-gnu libgl-dev libglu1-mesa-dev
+        sudo cmake/scripts/setup-loongarch64-cross.sh
+
     - name: Install iOS dependencies
       if: matrix.id == 'ios'
       run: |

cmake/Toolchains/loongarch64-linux-gnu.cmake

@@ -14,15 +14,15 @@ set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
 # No X11 in the sysroot; disable the X11 Vulkan path to avoid include-dir errors.
 set(USING_X11_VULKAN OFF CACHE BOOL "" FORCE)
 
-# Bypass find_package(OpenGL REQUIRED).  A stub libGL.so is required so that
+# Use legacy GL preference so find_package(OpenGL) looks for a single libGL.so
-# GLEW's static archive can be linked via PLT entries (direct B26 branches to
+# rather than the GLVND split (libOpenGL.so + libGLX.so), which we don't have.
-# address 0 would overflow on LoongArch).
+# A stub libGL.so + GL headers must be present in the sysroot; they are placed
-#
+# there by cmake/scripts/setup-loongarch64-cross.sh (run once with sudo, or
-# Primary: run cmake/scripts/setup-loongarch64-cross.sh (sudo) once — it
+# automatically by the CI install step).
-#          installs the stub + GL headers into the sysroot.
+set(OpenGL_GL_PREFERENCE LEGACY CACHE STRING "" FORCE)
-# Fallback: the stub can also sit in <build-dir>/stublibs/libGL.so;
+
-#           b.sh --loongarch64 creates this automatically on first run.
+# b.sh also creates a stub in <build-dir>/stublibs/ as a local fallback so the
-set(OPENGL_LIBRARIES GL CACHE STRING "" FORCE)
+# linker can resolve GL/GLX calls from GLEW's static archive via PLT entries.
 set(CMAKE_EXE_LINKER_FLAGS
     "${CMAKE_EXE_LINKER_FLAGS} -L${CMAKE_BINARY_DIR}/stublibs"
     CACHE STRING "" FORCE)

cmake/scripts/setup-loongarch64-cross.sh

@@ -22,7 +22,7 @@ fi
 # GL headers are platform-independent C headers; copy from the host.
 echo "Installing GL headers into sysroot..."
 mkdir -p $SYSROOT/include/GL
-for h in gl.h glext.h glcorearb.h; do
+for h in gl.h glext.h glcorearb.h glu.h; do
     [ -f /usr/include/GL/$h ] && cp /usr/include/GL/$h $SYSROOT/include/GL/ && echo "  $h"
 done