driver: Pass -P through to the pre-processor

Since we no longer pass -P to cpp ourselves, we need to pass it
through when it appears on the command-line instead of ignoring it.

1 files changed, 1 insertions, 1 deletions

diff --git a/driver.c b/driver.c
index 2fc7e4f..5f7d3ed 100644
--- a/driver.c
+++ b/driver.c
@@ -500,7 +500,7 @@ main(int argc, char *argv[])
 				output = nextarg(&argv);
 				break;
 			case 'P':
-				/* ignore */
+				arrayaddptr(&stages[PREPROCESS].cmd, "-P");
 				break;
 			case 'S':
 				last = CODEGEN;