[Flang] Update build config for AMDGPU (#269)

Updates the build config for the flang OpenMP offload buildbot.

Author: jplehr

buildbot/osuosl/master/config/builders.py

@@ -1942,8 +1942,8 @@
     'builddir': "openmp-offload-amdgpu-clang-flang",
     'factory' : OpenMPBuilder.getOpenMPCMakeBuildFactory(
                         clean=True,
-                        enable_runtimes=['compiler-rt', 'openmp', 'offload'],
-                        depends_on_projects=['llvm','clang','lld', 'offload', 'openmp','flang', 'compiler-rt'],
+                        enable_runtimes=['compiler-rt', 'libunwind', 'libcxx', 'libcxxabi', 'openmp', 'offload'],
+                        depends_on_projects=['llvm','clang','lld', 'offload', 'openmp','flang', 'compiler-rt', 'libcxx', 'libcxxabi', 'libunwind'],
                         extraCmakeArgs=[
                             "-DCMAKE_BUILD_TYPE=Release",
                             "-DCLANG_DEFAULT_LINKER=lld",
@@ -1952,6 +1952,22 @@
                             "-DCMAKE_C_COMPILER_LAUNCHER=ccache",
                             "-DCMAKE_CXX_COMPILER_LAUNCHER=ccache",
                             "-DFLANG_RUNTIME_F128_MATH_LIB=libquadmath",
+                            "-DLIBCXX_ENABLE_SHARED=OFF",
+                            "-DLIBCXX_ENABLE_STATIC=ON",
+                            "-DLIBCXX_INSTALL_LIBRARY=OFF",
+                            "-DLIBCXX_INSTALL_HEADERS=OFF",
+                            "-DLIBCXXABI_ENABLE_SHARED=OFF",
+                            "-DLIBCXXABI_ENABLE_STATIC=ON",
+                            "-DLIBCXXABI_INSTALL_STATIC_LIBRARY=OFF",
+                            "-DLLVM_ENABLE_ZLIB=ON",
+                            "-DLLVM_ENABLE_Z3_SOLVER=OFF",
+                            "-DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON",
+                            "-DCMAKE_CXX_STANDARD=17",
+                            "-DBUILD_SHARED_LIBS=ON",
+                            "-DLLVM_ENABLE_LIBCXX=ON",
+                            "-DCLANG_DEFAULT_RTLIB=compiler-rt",
+                            "-DCLANG_DEFAULT_UNWINDLIB=libgcc",
+                            "-DLIBOMPTARGET_PLUGINS_TO_BUILD=amdgpu;host",
                             ],
                         env={
                             'HSA_ENABLE_SDMA':'0',