From aaf20fb96eaf21ead775fde6bad00d8e71650b5a Mon Sep 17 00:00:00 2001
From: Rui Ueyama <ruiu@cs.stanford.edu>
Date: Wed, 22 Jul 2020 22:16:01 +0900
Subject: [PATCH] [GNU] Add line marker directive

---
 preprocess.c | 5 +++++
 test/line.c  | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/preprocess.c b/preprocess.c
index 0b56922..715830d 100644
--- a/preprocess.c
+++ b/preprocess.c
@@ -839,6 +839,11 @@ static Token *preprocess2(Token *tok) {
       continue;
     }
 
+    if (tok->kind == TK_PP_NUM) {
+      read_line_marker(&tok, tok);
+      continue;
+    }
+
     if (equal(tok, "error"))
       error_tok(tok, "error");
 
diff --git a/test/line.c b/test/line.c
index 92a5527..d480d98 100644
--- a/test/line.c
+++ b/test/line.c
@@ -12,6 +12,10 @@ int main() {
 #line 1
   ASSERT(2, __LINE__);
 
+# 200 "xyz" 2 3
+  ASSERT(201, __LINE__);
+  ASSERT(0, strcmp(__FILE__, "xyz"));
+
   printf("OK\n");
   return 0;
 }