gcc-15 flags

Author: perazz

.github/workflows/CI.yml

@@ -52,6 +52,10 @@ jobs:
             os-arch: windows-x86_64
             release-flags: --flag '--static -g -fbacktrace -O3'
             exe: .exe
+          - os: macos-13
+            os-arch: macos-x86_64
+            toolchain: {compiler: gcc, version: 15}
+            release-flags: --flag '-g -fbacktrace -O3 -Wno-external-argument-mismatch'
 
     steps:
     - name: Checkout code