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diff --git a/tools/build/make.py b/tools/build/make.py
--- a/tools/build/make.py
+++ b/tools/build/make.py
@@ -34,11 +34,22 @@
# On FreeBSD you can use it the same way as just calling make:
# `MAKEOBJDIRPREFIX=~/obj ./tools/build/make.py buildworld -DWITH_FOO`
#
-# On Linux and MacOS you will either need to set XCC/XCXX/XLD/XCPP or pass
-# --cross-bindir to specify the path to the cross-compiler bindir:
-# `MAKEOBJDIRPREFIX=~/obj ./tools/build/make.py
-# --cross-bindir=/path/to/cross/compiler buildworld -DWITH_FOO TARGET=foo
-# TARGET_ARCH=bar`
+# On Linux and MacOS you may need to explicitly indicate the cross toolchain
+# to use. You can do this by:
+# - setting XCC/XCXX/XLD/XCPP to the paths of each tool
+# - using --cross-bindir to specify the path to the cross-compiler bindir:
+# `MAKEOBJDIRPREFIX=~/obj ./tools/build/make.py
+# --cross-bindir=/path/to/cross/compiler buildworld -DWITH_FOO TARGET=foo
+# TARGET_ARCH=bar`
+# - using --cross-toolchain to specify the package containing the cross-compiler
+# (MacOS only currently):
+# `MAKEOBJDIRPREFIX=~/obj ./tools/build/make.py
+# --cross-toolchain=llvm@NN buildworld -DWITH_FOO TARGET=foo
+# TARGET_ARCH=bar`
+#
+# On MacOS, this tool will search for an llvm toolchain installed via brew and
+# use it as the cross toolchain if an explicit toolchain is not specified.
+
import argparse
import functools
import os
@@ -160,7 +171,8 @@
return
if not bindir:
sys.exit("Could not infer value for $" + varname + ". Either set $" +
- varname + " or pass --cross-bindir=/cross/compiler/dir/bin")
+ varname + " or pass --cross-bindir=/cross/compiler/dir/bin" +
+ " or --cross-toolchain=<package>")
# try to infer the path to the tool
guess = os.path.join(bindir, binary_name)
if not os.path.isfile(guess):
@@ -179,7 +191,8 @@
return
global parsed_args
if parsed_args.cross_bindir is None:
- cross_bindir = default_cross_toolchain(binary_name)
+ cross_bindir = cross_toolchain_bindir(binary_name,
+ parsed_args.cross_toolchain)
else:
cross_bindir = parsed_args.cross_bindir
return check_required_make_env_var(varname, binary_name,
@@ -202,17 +215,20 @@
pass
return None
-def default_cross_toolchain(binary_name):
+def cross_toolchain_bindir(binary_name, package):
# default to homebrew-installed clang on MacOS if available
if sys.platform.startswith("darwin"):
if shutil.which("brew"):
- bindir = binary_path(brew_prefix("llvm"), binary_name)
+ if not package:
+ package = "llvm"
+ bindir = binary_path(brew_prefix(package), binary_name)
if bindir:
return bindir
# brew installs lld as a separate package for LLVM 19 and later
if binary_name == "ld.lld":
- bindir = binary_path(brew_prefix("lld"), binary_name)
+ lld_package = package.replace("llvm", "lld")
+ bindir = binary_path(brew_prefix(lld_package), binary_name)
if bindir:
return bindir
return None
@@ -234,6 +250,10 @@
help="Compiler type to find in --cross-bindir (only "
"needed if XCC/XCPP/XLD are not set)"
"Note: using CC is currently highly experimental")
+ parser.add_argument("--cross-toolchain", default=None,
+ help="Name of package containing cc/c++/cpp/ld to build "
+ "target binaries (only needed if XCC/XCPP/XLD "
+ "are not set)")
parser.add_argument("--host-compiler-type", choices=("cc", "clang", "gcc"),
default="cc",
help="Compiler type to find in --host-bindir (only "

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