[libc++][AIX] Add scripts and config for building with the libcxx CI infrastructure

This initial change adds the AIX configuration to run-buildbot, an AIX
CMake cache file, and appropriate compiler and linker flags for testing
AIX to the lit "from scratch" configuration files. Either of the 32-bit or 64-bit configurations
can be built by setting `OBJECT_MODE` in the build environment (as is
typical for AIX).

Reviewed By: ldionne, #libc, #libc_abi

Differential Revision: https://reviews.llvm.org/D111244

libcxx/cmake/caches/AIX.cmake

@@ -0,0 +1,16 @@
+set(CMAKE_BUILD_TYPE Release CACHE STRING "")
+set(CMAKE_BUILD_WITH_INSTALL_RPATH ON CACHE BOOL "")
+set(CMAKE_C_FLAGS "-D__LIBC_NO_CPP_MATH_OVERLOADS__" CACHE STRING "")
+set(CMAKE_CXX_FLAGS "-D__LIBC_NO_CPP_MATH_OVERLOADS__" CACHE STRING "")
+set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-G -Wl,-bcdtors:all:-2147483548:s" CACHE STRING "")
+
+set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
+set(LIBCXX_ENABLE_ASSERTIONS OFF CACHE BOOL "")
+set(LIBCXX_ABI_VERSION "1" CACHE STRING "")
+set(LIBCXX_ENABLE_ABI_LINKER_SCRIPT OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBCXX_ENABLE_STATIC OFF CACHE BOOL "")
+set(LIBCXXABI_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBCXXABI_ENABLE_STATIC OFF CACHE BOOL "")
+set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")

libcxx/test/configs/ibm-libc++-shared.cfg.in

@@ -0,0 +1,28 @@
+# This testing configuration handles running the test suite against libc++ on
+# AIX using a shared library.
+#
+
+import sys
+
+lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
+
+config.substitutions.append(('%{flags}', ''))
+config.substitutions.append(('%{compile_flags}',
+    '-nostdinc++ -D__LIBC_NO_CPP_MATH_OVERLOADS__ -isystem %{install}/include/c++/v1 -I %{libcxx}/test/support'
+))
+config.substitutions.append(('%{link_flags}',
+    '-nostdlib++ -L %{install}/lib -lc++ -lc++abi -latomic -Wl,-bbigtoc'
+))
+config.substitutions.append(('%{exec}',
+    '{} %{{libcxx}}/utils/run.py --execdir %T --env LIBPATH=%{{install}}/lib -- '.format(sys.executable)
+))
+
+import os, site
+site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
+import libcxx.test.params, libcxx.test.newconfig, libcxx.test.newconfig
+libcxx.test.newconfig.configure(
+    libcxx.test.params.DEFAULT_PARAMETERS,
+    libcxx.test.features.DEFAULT_FEATURES,
+    config,
+    lit_config
+)

libcxx/utils/ci/run-buildbot

@@ -113,6 +113,13 @@ function generate-cmake-libcxx-win() {
           "${@}"
 }
 
+function generate-cmake-aix() {
+    generate-cmake-base \
+          -S "${MONOREPO_ROOT}/llvm" \
+          -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi" \
+          "${@}"
+}
+
 function check-runtimes() {
     echo "--- Installing libc++, libc++abi and libunwind to a fake location"
     ${NINJA} -vC "${BUILD_DIR}" install-cxx install-cxxabi install-unwind
@@ -564,6 +571,17 @@ windows-static)
     echo "+++ Running the libc++ tests"
     ${NINJA} -vC "${BUILD_DIR}" check-cxx
 ;;
+aix)
+    export CC=ibm-clang
+    export CXX=ibm-clang++_r
+    clean
+    generate-cmake-aix -C "${MONOREPO_ROOT}/libcxx/cmake/caches/AIX.cmake" \
+                   -DLIBCXX_TEST_CONFIG="ibm-libc++-shared.cfg.in" \
+                   -DLIBCXXABI_TEST_CONFIG="ibm-libc++abi-shared.cfg.in"
+    # TODO: use check-runtimes once libunwind builds cleanly on AIX.
+    ${NINJA} -vC "${BUILD_DIR}" install-cxx install-cxxabi
+    ${NINJA} -vC "${BUILD_DIR}" check-cxx check-cxxabi
+;;
 #################################################################
 # Insert vendor-specific internal configurations below.
 #

libcxxabi/test/configs/ibm-libc++abi-shared.cfg.in

@@ -0,0 +1,29 @@
+# Testing configuration for libc++abi on AIX.
+
+import sys
+
+lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
+
+config.substitutions.append(('%{flags}',''))
+config.substitutions.append(('%{compile_flags}',
+    '-nostdinc++ -isystem %{install}/include/c++/v1 ' + 
+    '-D__LIBC_NO_CPP_MATH_OVERLOADS__ -DLIBCXXABI_NO_TIMER ' +
+    '-D_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS ' +
+    '-I %{libcxx}/test/support -I %{libcxx}/src'
+))
+config.substitutions.append(('%{link_flags}',
+    '-nostdlib++ -L %{install}/lib -lc++ -lc++abi -Wl,-bbigtoc'
+))
+config.substitutions.append(('%{exec}',
+    '{} %{{libcxx}}/utils/run.py --execdir %T --env LIBPATH=%{{install}}/lib -- '.format(sys.executable)
+))
+
+import os, site
+site.addsitedir(os.path.join('@LIBCXXABI_LIBCXX_PATH@', 'utils'))
+import libcxx.test.params, libcxx.test.newconfig, libcxx.test.newconfig
+libcxx.test.newconfig.configure(
+    libcxx.test.params.DEFAULT_PARAMETERS,
+    libcxx.test.features.DEFAULT_FEATURES,
+    config,
+    lit_config
+)