Can override programs with scripts generated with configure_file.

mesonbuild/interpreter.py

@@ -1426,6 +1426,12 @@ class MesonMain(InterpreterObject):
             raise InterpreterException('First argument must be a string')
         if hasattr(exe, 'held_object'):
             exe = exe.held_object
+        if isinstance(exe, mesonlib.File):
+            abspath = exe.absolute_path(self.interpreter.environment.source_dir,
+                                        self.interpreter.environment.build_dir)
+            if not os.path.exists(abspath):
+                raise InterpreterException('Tried to override %s with a file that does not exist.' % name)
+            exe = dependencies.ExternalProgram(abspath)
         if not isinstance(exe, dependencies.ExternalProgram):
             # FIXME, make this work if the exe is an Executable target.
             raise InterpreterException('Second argument must be an external program.')

test cases/common/182 find override/otherdir/main2.c

@@ -0,0 +1,5 @@
+int number_returner();
+
+int main(int argc, char **argv) {
+    return number_returner() == 100 ? 0 : 1;
+}

test cases/common/182 find override/otherdir/meson.build

@@ -9,3 +9,18 @@ src = custom_target('arrival',
 e = executable('six', 'main.c', src)
 
 test('six', e)
+
+# The same again, but this time with a program that was genererated
+# with configure_file.
+
+gen = find_program('gencodegen')
+
+src = custom_target('hundred',
+  input : 'source2.desc',
+  output : 'file2.c',
+  command : [gen, '@INPUT@', '@OUTPUT@']
+  )
+
+e = executable('hundred', 'main2.c', src)
+
+test('hundred', e)

test cases/common/182 find override/otherdir/source2.desc

@@ -0,0 +1 @@
+number_returner

test cases/common/182 find override/subdir/converter.py

@@ -12,4 +12,4 @@ ftempl = '''int %s() {
 
 d = pathlib.Path(ifilename).read_text().split('\n')[0].strip()
 
-pathlib.Path(ofilename).write_text(ftempl % d)
+pathlib.Path(ofilename).write_text(ftempl % d)

test cases/common/182 find override/subdir/gencodegen.py.in

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+
+import sys
+import pathlib
+
+[ifilename, ofilename] = sys.argv[1:3]
+
+ftempl = '''int %s() {
+    return @NUMBER@;
+}
+'''
+
+d = pathlib.Path(ifilename).read_text().split('\n')[0].strip()
+
+pathlib.Path(ofilename).write_text(ftempl % d)

test cases/common/182 find override/subdir/meson.build

@@ -1,3 +1,14 @@
 x = find_program('converter.py')
 
 meson.override_find_program('codegen', x)
+
+# Override a command with a generated script
+
+cdata = configuration_data()
+
+cdata.set('NUMBER', 100)
+numprog = configure_file(input : 'gencodegen.py.in',
+  output : 'gencodegen.py',
+  configuration : cdata)
+
+meson.override_find_program('gencodegen', numprog)