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import sys
import subprocess
import os
def run_llvm_config(args):
"""
Runs llvm-config with the given arguments and returns its stripped stdout.
Exits the script if llvm-config is not found or returns an error.
"""
try:
return subprocess.check_output(
["llvm-config"] + args,
text=True, # Decode output as text (Python 3)
).strip()
except (subprocess.CalledProcessError, FileNotFoundError) as e:
sys.stderr.write(f"Error: Failed to run 'llvm-config {' '.join(args)}'.\n")
if isinstance(e, subprocess.CalledProcessError):
sys.stderr.write(f"STDOUT: {e.stdout}\n")
sys.stderr.write(f"STDERR: {e.stderr}\n")
else: # FileNotFoundError
sys.stderr.write(
"Ensure 'llvm-config' is installed and in your system's PATH.\n")
sys.exit(1)
def format_gn_list(items):
"""Formats a Python list into a GN-compatible list string, removing duplicates and sorting."""
if not items:
return "[]"
return "[\n" + ",\n".join(
f' "{item}"' for item in sorted(list(set(items)))) + "\n]"
def main():
llvm_include_dir = run_llvm_config(["--includedir"])
cxxflags_raw = run_llvm_config(["--cxxflags"])
defines_list = []
cflags_list = []
for flag in cxxflags_raw.split():
if flag.startswith('-D'):
defines_list.append(flag[2:])
elif not flag.startswith('-I'):
cflags_list.append(flag)
cflags_list.insert(0, f'-isystem{llvm_include_dir}')
# Get ALL flags and library names needed for SHARED linking
ldflags_and_libs_raw = run_llvm_config(
["--ldflags", "--libs", "--link-shared", "symbolize"])
ldflags_list = []
libs_list = []
for part in ldflags_and_libs_raw.split():
if part.startswith('-L'):
# Add library search paths (e.g., "-L/usr/lib/llvm-19/lib")
ldflags_list.append(part)
elif part.startswith('-l'):
# Add library names (e.g., "LLVM-19", "z")
libs_list.append(part[2:])
else:
# Add other miscellaneous flags
ldflags_list.append(part)
# Print output in GN-compatible format
print(f"defines = {format_gn_list(defines_list)}")
print(f"cflags = {format_gn_list(cflags_list)}")
print(f"libs = {format_gn_list(libs_list)}")
print(f"ldflags = {format_gn_list(ldflags_list)}")
return 0
if __name__ == '__main__':
sys.exit(main())
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