From 31c56d7353a61faa9302a64f17cae44606ed8118 Mon Sep 17 00:00:00 2001
From: Greg Hewgill <greg@hewgill.com>
Date: Tue, 1 Mar 2011 19:32:47 +1300
Subject: [PATCH] handle embedded whitespace in #if 0 processing

---
 lib/preprocessor.cpp      |  8 ++++----
 test/testpreprocessor.cpp | 13 +++++++++++++
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/lib/preprocessor.cpp b/lib/preprocessor.cpp
index 17963f673..c41134a09 100644
--- a/lib/preprocessor.cpp
+++ b/lib/preprocessor.cpp
@@ -178,15 +178,15 @@ std::string Preprocessor::read(std::istream &istr, const std::string &filename,
     // Remove all comments..
     result = removeComments(result, filename, settings);
 
-    // Remove '#if 0' blocks
-    if (result.find("#if 0\n") != std::string::npos)
-        result = removeIf0(result);
-
     // ------------------------------------------------------------------------------------------
     //
     // Clean up all preprocessor statements
     result = preprocessCleanupDirectives(result);
 
+    // Remove '#if 0' blocks
+    if (result.find("#if 0\n") != std::string::npos)
+        result = removeIf0(result);
+
     // ------------------------------------------------------------------------------------------
     //
     // Clean up preprocessor #if statements with Parantheses
diff --git a/test/testpreprocessor.cpp b/test/testpreprocessor.cpp
index a16eccfd8..1e6ce5c64 100644
--- a/test/testpreprocessor.cpp
+++ b/test/testpreprocessor.cpp
@@ -93,6 +93,7 @@ private:
         TEST_CASE(error3);
 
         TEST_CASE(if0_exclude);
+        TEST_CASE(if0_whitespace);
 
         // Don't handle include in a #if 0 block
         TEST_CASE(if0_include_1);
@@ -655,6 +656,18 @@ private:
         ASSERT_EQUALS("\n\n\nB\n", preprocessor.read(code,"",NULL));
     }
 
+    void if0_whitespace()
+    {
+        Settings settings;
+        Preprocessor preprocessor(&settings, this);
+
+        std::istringstream code(" # if  0 \n"
+                                "A\n"
+                                " # endif \n"
+                                "B\n");
+        ASSERT_EQUALS("\n\n\nB\n", preprocessor.read(code,"",NULL));
+    }
+
     void if0_include_1()
     {
         Settings settings;