fix missing extension in command path

On Windows, if the native file contains a path without the
extension, the executable may be found, but custom target would
fail because that path does not exist.

1 files changed, 9 insertions, 0 deletions

diff --git a/mesonbuild/programs.py b/mesonbuild/programs.py
index 9ad38e126..46d00ceca 100644
--- a/mesonbuild/programs.py
+++ b/mesonbuild/programs.py
@@ -55,6 +55,15 @@ class ExternalProgram(mesonlib.HoldableObject):
                 if ret:
                     self.command = ret + args
                 else:
+                    if os.path.isabs(cmd) and not os.path.exists(cmd):
+                        # Maybe the name is an absolute path to a native Windows
+                        # executable, but without the extension. This is technically wrong,
+                        # but many people do it because it works in the MinGW shell.
+                        for ext in self.windows_exts:
+                            trial_ext = f'{cmd}.{ext}'
+                            if os.path.exists(trial_ext):
+                                cmd = trial_ext
+                                break
                     self.command = [cmd] + args
         else:
             if search_dirs is None: