[OpenMP] Fixing OpenMP/driver.c failing on 32-bit hosts

[jhuber6]

Summary

The changes made in D88594 caused the test OpenMP/driver.c to fail on a 32-bit host becuase it was offloading to a 64-bit architecture by default. The offloading test was moved to a new file and a feature was added to the lit config to check for a 64-bit host.

[jhuber6]

Changing to just check if the target triple is of four known 64-bit architectures.

[daltenty]

Thanks! I've verified this fixes the test on AIX.

clang/test/OpenMP/driver-openmp-target.c

 // REQUIRES: x86-registered-target
-// REQUIRES: clang-64-bits
+// REQUIRES: clang-target-64-bits
 // RUN: %clang %s -c -E -dM -fopenmp=libomp -fopenmp-version=45 -fopenmp-targets=x86_64-unknown-unknown -o - | FileCheck --check-prefix=CHECK-45-VERSION --check-prefix=CHECK-45-VERSION2 %s
 // CHECK-45-VERSION: #define _OPENMP 201511
 // CHECK-45-VERSION2: #define _OPENMP 201511

clang/test/lit.cfg.py

 # -*- Python -*-
 
 import os
-import sys
 import platform
 import re
 import subprocess
 import tempfile
 
 import lit.formats
 import lit.util
 

 if re.match(r'^arm64(e)?-apple-(macos|darwin)', config.target_triple):
     config.available_features.add('apple-silicon-mac')
 
 # [PR18856] Depends to remove opened file. On win32, a file could be removed
 # only if all handles were closed.
 if platform.system() not in ['Windows']:
     config.available_features.add('can-remove-opened-file')
 
-# Check 64-bit host
-if sys.maxsize > 2**32:
-  config.available_features.add("clang-64-bits")
+# Features
+known_arches = ["x86_64", "mips64", "ppc64", "aarch64"]
+if (config.host_ldflags.find("-m32") < 0
+    and any(config.host_triple.startswith(x) for x in known_arches)):
+  config.available_features.add("clang-target-64-bits")
+
 
 
 def calculate_arch_features(arch_string):
     features = []
     for arch in arch_string.split():
         features.append(arch.lower() + '-registered-target')
     return features
 

clang/test/lit.site.cfg.py.in

 @LIT_SITE_CFG_IN_HEADER@
 
 import sys
 
 config.llvm_src_root = path(r"@LLVM_SOURCE_DIR@")
 config.llvm_obj_root = path(r"@LLVM_BINARY_DIR@")
 config.llvm_tools_dir = path(r"@LLVM_TOOLS_DIR@")
 config.llvm_libs_dir = path(r"@LLVM_LIBS_DIR@")
 config.llvm_shlib_dir = path(r"@SHLIBDIR@")
 config.llvm_plugin_ext = "@LLVM_PLUGIN_EXT@"
 config.lit_tools_dir = path(r"@LLVM_LIT_TOOLS_DIR@")
 config.clang_obj_root = path(r"@CLANG_BINARY_DIR@")
 config.clang_src_dir = path(r"@CLANG_SOURCE_DIR@")
 config.clang_tools_dir = path(r"@CLANG_TOOLS_DIR@")
 config.host_triple = "@LLVM_HOST_TRIPLE@"
+config.target_triple = "@LLVM_TARGET_TRIPLE_ENV@"
 config.target_triple = "@TARGET_TRIPLE@"
 config.host_cxx = "@CMAKE_CXX_COMPILER@"
 config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
 config.have_zlib = @LLVM_ENABLE_ZLIB@
 config.clang_arcmt = @CLANG_ENABLE_ARCMT@
 config.clang_default_cxx_stdlib = "@CLANG_DEFAULT_CXX_STDLIB@"
 config.clang_staticanalyzer = @CLANG_ENABLE_STATIC_ANALYZER@
 config.clang_staticanalyzer_z3 = "@LLVM_WITH_Z3@"
 config.clang_examples = @CLANG_BUILD_EXAMPLES@
 config.enable_shared = @ENABLE_SHARED@
 config.enable_backtrace = @ENABLE_BACKTRACES@
 config.enable_experimental_new_pass_manager = @ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER@
 config.enable_threads = @LLVM_ENABLE_THREADS@
 config.host_arch = "@HOST_ARCH@"
 config.python_executable = "@Python3_EXECUTABLE@"
 config.use_z3_solver = lit_config.params.get('USE_Z3_SOLVER', "@USE_Z3_SOLVER@")
 config.has_plugins = @LLVM_ENABLE_PLUGINS@
 config.clang_vendor_uti = "@CLANG_VENDOR_UTI@"
+config.host_ldflags = '@HOST_LDFLAGS@'
 
 # Support substitution of the tools and libs dirs with user parameters. This is
 # used when we can't determine the tool dir at configuration time.
 try:
     config.clang_tools_dir = config.clang_tools_dir % lit_config.params
     config.llvm_tools_dir = config.llvm_tools_dir % lit_config.params
     config.llvm_shlib_dir = config.llvm_shlib_dir % lit_config.params
     config.llvm_libs_dir = config.llvm_libs_dir % lit_config.params