generated_headers: [
"llvm-gen-attributes",
"llvm-gen-intrinsics",
+ "llvm-gen-revision",
],
export_generated_headers: [
"llvm-gen-attributes",
"llvm-gen-intrinsics",
+ "llvm-gen-revision",
],
target: {
windows: {
],
}
+genrule {
+ name: "llvm-gen-revision",
+ out: ["llvm/Support/VCSRevision.h"],
+ srcs: [".git/logs/HEAD"],
+ tool_files: ["git_sha1_gen.py"],
+ cmd: "python $(location git_sha1_gen.py) --output $(out)",
+}
+
force_build_llvm_components_defaults {
name: "force_build_llvm_components",
// Host build disabled by soong/llvm.go unless FORCE_BUILD_LLVM_COMPONENTS
--- /dev/null
+"""
+Generate the contents of the git_sha1.h file.
+The output of this script goes to stdout.
+"""
+
+
+import argparse
+import os
+import os.path
+import subprocess
+import sys
+
+
+def get_git_sha1():
+ """Try to get the git SHA1 with git rev-parse."""
+ git_dir = os.path.join(os.path.dirname(sys.argv[0]), '.', '.git')
+ try:
+ git_sha1 = subprocess.check_output([
+ 'git',
+ '--git-dir=' + git_dir,
+ 'rev-parse',
+ 'HEAD',
+ ], stderr=open(os.devnull, 'w')).decode("ascii")
+ except:
+ # don't print anything if it fails
+ git_sha1 = ''
+ return git_sha1
+
+def write_if_different(contents):
+ """
+ Avoid touching the output file if it doesn't need modifications
+ Useful to avoid triggering rebuilds when nothing has changed.
+ """
+ if os.path.isfile(args.output):
+ with open(args.output, 'r') as file:
+ if file.read() == contents:
+ return
+ with open(args.output, 'w') as file:
+ file.write(contents)
+
+parser = argparse.ArgumentParser()
+parser.add_argument('--output', help='File to write the #define in',
+ required=True)
+args = parser.parse_args()
+
+git_sha1 = os.environ.get('LLVM_REVISION_OVERRIDE', get_git_sha1())[:7]
+if git_sha1:
+ write_if_different('#define LLVM_REVISION "git-' + git_sha1 + '"')
+else:
+ write_if_different('#define LLVM_REVISION ""')