project.toolset: move _full_exe_name to utils

1 files changed, 30 insertions, 0 deletions

diff --git a/project/utils.py b/project/utils.py
index 711db97..39dfb0d 100644
--- a/project/utils.py
+++ b/project/utils.py
@@ -7,11 +7,14 @@ from contextlib import contextmanager
 import functools
 import logging
 import os.path
+import shutil
 import subprocess
 import sys
 import tempfile
 import time
 
+from project.os import on_cygwin, on_linux
+
 
 def normalize_path(s):
     return os.path.abspath(os.path.normpath(s))
@@ -21,6 +24,33 @@ def mkdir_parent(path):
     os.makedirs(path, exist_ok=True)
 
 
+def full_exe_name(exe):
+    if on_linux():
+        # There's no PATHEXT on Linux.
+        return exe
+    # b2 on Windows/Cygwin doesn't like it when the executable name doesn't
+    # include the extension.
+    dir_path = os.path.dirname(exe) or None
+    path = shutil.which(exe, path=dir_path)
+    if not path:
+        raise RuntimeError(f"executable '{exe}' could not be found")
+    if on_cygwin():
+        # On Cygwin, shutil.which('gcc') == '/usr/bin/gcc' and shutil.which('gcc.exe')
+        # == '/usr/bin/gcc.exe'; we want the latter version.  shutil.which('clang++')
+        # == '/usr/bin/clang++' is fine though, since it _is_ the complete path
+        # (clang++ is a symlink).
+        if os.path.exists(path) and os.path.exists(path + '.exe'):
+            path += '.exe'
+    if dir_path:
+        # If it was found in a specific directory, include the directory in the
+        # result.  shutil.which returns the executable name prefixed with the
+        # path argument.
+        return path
+    # If it was found in PATH, just return the basename (which includes the
+    # extension).
+    return os.path.basename(path)
+
+
 @contextmanager
 def setup_logging():
     logging.basicConfig(