Add ability to limit amount of preprocessing done on source

The cc.preprocessed variable can be 'none' (not preprocessed), 'includes' (no
depends on preprocessor, e.g., #ifdef, etc), and 'all' (the source is fully
preprocessed). Note that for 'all' the source can still contain comments and
line continuations.

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/common.test b/tests/common.test
index b8d6148..0e8ce52 100644
--- a/tests/common.test
+++ b/tests/common.test
@@ -5,6 +5,27 @@
 # Commonly-used build system test project setup and driver command line.
 #
 
+# If the includer indicated that no cross-testing should be supported, then
+# use the build system driver that is building, not the one being built.
+#
+# In many cases expecting a cross-compiled driver to perform a native build
+# under emulation is pushing things a bit too far. Plus, we have no way of
+# knowing the native compiler name/path.
+#
+# So the idea here is to test cross-compilation with the understanding that
+# the build system driver we are testing is not the one being cross-compiled
+# but rather the one doing the cross-compilation.
+#
+if ($null($crosstest))
+  crosstest = false
+end
+
+if (!$crosstest && $test.target != $build.host)
+  test = $recall($build.path)
+end
+
+# Common bootstrap.build.
+#
 +mkdir build
 +cat <<EOI >=build/bootstrap.build
 project = test