1 files changed, 46 insertions, 0 deletions
diff --git a/scripts/llvm.py b/scripts/llvm.py
index d1bf29d..ff8ecb1 100644
--- a/scripts/llvm.py
+++ b/scripts/llvm.py
@@ -4,6 +4,7 @@ import os
 from sys import argv
 from sys import exit
 
+from modules.llvm import build_llvm
 from modules.llvm import LLVMBuildConfig
 from modules.llvm import LLVMSubproject
 from modules.llvm import LLVMSourceConfig
@@ -116,6 +117,21 @@ def configure_build(args):
         die("Failed to configure {} because:\n{}".format(args.build, str(exc)))
 
 
+def run_build(args):
+    """Run a build command in a given directory."""
+    build_dir = args.build
+
+    if args.dry:
+        consumer = CommandPrinter()
+    else:
+        consumer = CommandRunner()
+
+    try:
+        build_llvm(consumer, args.build, args.flags)
+    except RuntimeError as exc:
+        die("Failed to build {} because:\n{}".format(args.build, str(exc)))
+
+
 ##########################################################################
 # Command line parsing                                                   #
 ##########################################################################
@@ -215,6 +231,36 @@ configure.add_argument(
     help="Print the CMake command instead of executing it.")
 configure.set_defaults(run_command=configure_build)
 
+# Subcommand for building a target
+build = subcommands.add_parser(
+    'build',
+    help="Run a build command in the given directory."
+    "The build command can be either a 'ninja' or a 'make' command, depending "
+    "on what the build directory contains. First, we look for a 'build.ninja' "
+    "file. If that is not found, we look for a 'Makefile'. If that is not "
+    "found either, the script fails.")
+build.add_argument(
+    '--build-dir',
+    dest='build',
+    required=True,
+    help="Path to the build directory. It must have already been configured.")
+build.add_argument(
+    '-n', '--dry-run',
+    dest='dry',
+    action='store_true',
+    default=False,
+    help="Print the build command instead of executing it.")
+build.add_argument(
+    '--build-flag',
+    dest='flags',
+    metavar='FLAG',
+    default=[],
+    action='append',
+    help="Additional flags for the build command (e.g. targets to build). "
+    "May be passed several times. If your flag starts with a '-', use "
+    "'--build-flag=-FLAG' to pass it.")
+build.set_defaults(run_command=run_build)
+
 args = options.parse_args()
 if args.subcommand == "projects" and args.add and not args.repos:
     projs.error(