tc_build: llvm: Move compiler-rt to LLVM_ENABLE_RUNTIMES

Per the new deprecation warning: llvm/llvm-project@b593110

Do the check based on LLVM_VERSION_MAJOR from source to avoid a
complicated and potentially hard to maintain dynamic check.

Signed-off-by: Nathan Chancellor <[email protected]>

Author: nathanchance

tc_build/llvm.py

@@ -32,6 +32,7 @@ def __init__(self):
         self.check_targets = []
         self.cmake_defines = {}
         self.install_targets = []
+        self.llvm_major_version = 0
         self.tools = None
         self.projects = []
         self.quiet_cmake = False
@@ -200,6 +201,7 @@ def configure(self):
             raise RuntimeError('No targets set?')
 
         self.validate_targets()
+        self.set_llvm_major_version()
 
         # yapf: disable
         cmake_cmd = [
@@ -247,7 +249,12 @@ def configure(self):
         if self.folders.install:
             self.cmake_defines['CMAKE_INSTALL_PREFIX'] = self.folders.install
 
-        self.cmake_defines['LLVM_ENABLE_PROJECTS'] = ';'.join(self.projects)
+        # https://github.com/llvm/llvm-project/commit/b593110d89aea76b8b10152b24ece154bff3e4b5
+        llvm_enable_projects = self.projects.copy()
+        if self.llvm_major_version >= 21 and self.project_is_enabled('compiler-rt'):
+            llvm_enable_projects.remove('compiler-rt')
+            self.cmake_defines['LLVM_ENABLE_RUNTIMES'] = 'compiler-rt'
+        self.cmake_defines['LLVM_ENABLE_PROJECTS'] = ';'.join(llvm_enable_projects)
         # Remove system dependency on terminfo to keep the dynamic library
         # dependencies slim. This can be done unconditionally when the option
         # exists, as it does not impact clang's ability to show colors for
@@ -321,6 +328,21 @@ def host_target_is_enabled(self):
     def project_is_enabled(self, project):
         return 'all' in self.projects or project in self.projects
 
+    def set_llvm_major_version(self):
+        if self.llvm_major_version:
+            return  # no need to set if already set
+        if not self.folders.source:
+            raise RuntimeError('No source folder set?')
+        if (llvmversion_cmake := Path(self.folders.source,
+                                      'cmake/Modules/LLVMVersion.cmake')).exists():
+            text_to_search = llvmversion_cmake.read_text(encoding='utf-8')
+        else:
+            text_to_search = Path(self.folders.source,
+                                  'llvm/CMakeLists.txt').read_text(encoding='utf-8')
+        if not (match := re.search(r'set\(LLVM_VERSION_MAJOR (\d+)\)', text_to_search)):
+            raise RuntimeError('Could not find LLVM_VERSION_MAJOR in text?')
+        self.llvm_major_version = int(match.group(1))
+
     def show_install_info(self):
         # Installation folder is optional, show build folder as the
         # installation location in that case.
@@ -389,7 +411,10 @@ def configure(self):
 
         llvm_build_tools = self.cmake_defines.get('LLVM_BUILD_TOOLS', 'ON') == 'ON'
 
+        self.set_llvm_major_version()
+
         distribution_components = []
+        runtime_distribution_components = []
         if llvm_build_tools:
             distribution_components += [
                 'llvm-ar',
@@ -407,7 +432,11 @@ def configure(self):
         if self.project_is_enabled('lld'):
             distribution_components.append('lld')
         if build_compiler_rt:
-            distribution_components += ['llvm-profdata', 'profile']
+            distribution_components.append('llvm-profdata')
+            if self.llvm_major_version >= 21:
+                runtime_distribution_components.append('profile')
+            else:
+                distribution_components.append('profile')
 
         slim_llvm_defines = {
             # Tools needed by bootstrapping
@@ -423,6 +452,8 @@ def configure(self):
             # Don't include example build targets to save on cmake cycles
             'LLVM_INCLUDE_EXAMPLES': 'OFF',
         }
+        if runtime_distribution_components:
+            slim_llvm_defines['LLVM_RUNTIME_DISTRIBUTION_COMPONENTS'] = ';'.join(runtime_distribution_components)
 
         slim_compiler_rt_defines = {
             # Don't build libfuzzer when compiler-rt is enabled, it invokes cmake again and we don't use it