Whitelist UnexpectedException test for all architectures and recommend libunwind in INSTALL

.github/workflows/main.yml

@@ -72,7 +72,7 @@ jobs:
     strategy:
       matrix:
         build-type: [ Release, Debug ]
-        llvm-version: [13, 14, 15]
+        llvm-version: [16, 17, 18]
         arch:
           - name: armhf
             system-processor: arm
@@ -102,14 +102,14 @@ jobs:
               name: riscv64
       # Don't abort runners if a single one fails
       fail-fast: false
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     name: Cross-build for ${{ matrix.arch.triple }} LLVM-${{ matrix.llvm-version}} ${{ matrix.build-type }}
     steps:
       - uses: actions/checkout@v3
       - name: Install cross-compile toolchain and QEMU
         run: |
           sudo apt update
-          sudo apt install libstdc++-9-dev-${{ matrix.arch.name }}-cross qemu-user ninja-build
+          sudo apt install libstdc++-14-dev-${{ matrix.arch.name }}-cross qemu-user ninja-build
       - name: Configure CMake
         run: |
           export LDFLAGS="-L/usr/lib/llvm-${{ matrix.llvm-version }}/lib/ -fuse-ld=lld-${{ matrix.llvm-version}} -Wl,--dynamic-linker=/usr/${{ matrix.arch.triple }}/lib/${{ matrix.arch.rtld }},-rpath,/usr/${{ matrix.arch.triple }}/lib"

.gitignore

@@ -3,3 +3,4 @@
 [b|B]uild
 Debug
 Release
+.cache

INSTALL

@@ -6,6 +6,14 @@ runtime.  Note that although this runtime should build with gcc, it is strongly
 recommended that you compile it with clang and clang++ as your [Objective-]C and
 [Objective-]C++ compilers.
 
+It is recommended that you use the LLVM runtime and unwinder or a recent version
+of GCC (>= 14) on GNU/Linux to avoid a
+[bug](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114843) in GCC and the libgcc
+unwinder.
+
+If CompilerRT and libunwind are installed on your machine use
+`-DCMAKE_EXE_LINKER_FLAGS="-rtlib=compiler-rt -unwindlib=libunwind"`.
+
 Basic Building
 --------------
 

Test/UnexpectedException.m

@@ -31,7 +31,6 @@ LONG WINAPI _UnhandledExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo)
 
 int main(void)
 {
-#if !(defined(__arm__) || defined(__ARM_ARCH_ISA_A64)) && !defined(__powerpc__)
 #if defined(_WIN32) && !defined(__MINGW32__)
 	// also verify that an existing handler still gets called after we set ours
 	SetUnhandledExceptionFilter(&_UnhandledExceptionFilter);
@@ -50,7 +49,4 @@ int main(void)
 	assert(0 && "should not be reached!");
 
 	return -1;
-#endif
-	// FIXME: Test currently fails on ARM and AArch64
-	return 77; // Skip test
 }