+
+def have_ld_plugin_support():
+ if not os.path.exists(os.path.join(config.llvm_shlib_dir, 'LLVMgold.so')):
+ return False
+
+ ld_cmd = subprocess.Popen([config.gold_executable, '--help'], stdout = subprocess.PIPE, env={'LANG': 'C'})
+ ld_out = ld_cmd.stdout.read().decode()
+ ld_cmd.wait()
+
+ if not '-plugin' in ld_out:
+ return False
+
+ # check that the used emulations are supported.
+ emu_line = [l for l in ld_out.split('\n') if 'supported emulations' in l]
+ if len(emu_line) != 1:
+ return False
+ emu_line = emu_line[0]
+ fields = emu_line.split(':')
+ if len(fields) != 3:
+ return False
+ emulations = fields[2].split()
+ if 'elf_x86_64' not in emulations:
+ return False
+ if 'elf32ppc' in emulations:
+ config.available_features.add('ld_emu_elf32ppc')
+
+ ld_version = subprocess.Popen([config.gold_executable, '--version'], stdout = subprocess.PIPE, env={'LANG': 'C'})
+ if not 'GNU gold' in ld_version.stdout.read().decode():
+ return False
+ ld_version.wait()
+
+ return True
+
+if have_ld_plugin_support():
+ config.available_features.add('ld_plugin')
+
+def have_ld64_plugin_support():
+ if config.ld64_executable == '':
+ return False
+
+ ld_cmd = subprocess.Popen([config.ld64_executable, '-v'], stderr = subprocess.PIPE)
+ ld_out = ld_cmd.stderr.read().decode()
+ ld_cmd.wait()
+
+ if 'ld64' not in ld_out or 'LTO' not in ld_out:
+ return False
+
+ return True
+
+if have_ld64_plugin_support():
+ config.available_features.add('ld64_plugin')
+
+# Ask llvm-config about assertion mode.