Add testObsoleteHeaderDisappearsIncludes{Alphabetic,Reverse}()

integrationtests.py

@@ -323,6 +323,48 @@ def testRequiredHeaderDisappears(self):
             os.remove("info.h")
             subprocess.check_call(compileCmd)
 
+    # When a header included by another header becomes obsolete and disappers,
+    # we must fall back to real compiler.
+    def testObsoleteHeaderDisappearsIncludesAlphabetic(self):
+        # A includes B
+        with cd(os.path.join(ASSETS_DIR, "header-miss-obsolete")):
+            compileCmd = CLCACHE_CMD + ["/I.", "/nologo", "/EHsc", "/c", "a_includes_b.cpp"]
+
+            with open("A.h", "w") as header:
+                header.write('#define INFO 1337\n')
+                header.write('#include "B.h"\n')
+            with open("B.h", "w") as header:
+                header.write('#define SOMETHING 1\n')
+
+            subprocess.check_call(compileCmd)
+
+            with open("A.h", "w") as header:
+                header.write('#define INFO 1337\n')
+                header.write('\n')
+            os.remove("B.h")
+
+            subprocess.check_call(compileCmd)
+
+    def testObsoleteHeaderDisappearsIncludesReverse(self):
+        # B includes A
+        with cd(os.path.join(ASSETS_DIR, "header-miss-obsolete")):
+            compileCmd = CLCACHE_CMD + ["/I.", "/nologo", "/EHsc", "/c", "b_includes_a.cpp"]
+
+            with open("A.h", "w") as header:
+                header.write('#define SOMETHING 1\n')
+            with open("B.h", "w") as header:
+                header.write('#define INFO 1337\n')
+                header.write('#include "A.h"\n')
+
+            subprocess.check_call(compileCmd)
+
+            os.remove("A.h")
+            with open("B.h", "w") as header:
+                header.write('#define INFO 1337\n')
+                header.write('\n')
+
+            subprocess.check_call(compileCmd)
+
 
 class TestRunParallel(unittest.TestCase):
     def _zeroStats(self):

tests/integrationtests/header-miss-obsolete/.gitignore

@@ -0,0 +1,5 @@
+*.obj
+
+# headers auto-generated by tests
+A.h
+B.h

tests/integrationtests/header-miss-obsolete/a_includes_b.cpp

@@ -0,0 +1,8 @@
+#include <iostream>
+#include "A.h"
+
+int main()
+{
+    std::cout << INFO << std::endl;
+    return 0;
+}

tests/integrationtests/header-miss-obsolete/b_includes_a.cpp

@@ -0,0 +1,8 @@
+#include <iostream>
+#include "B.h"
+
+int main()
+{
+    std::cout << INFO << std::endl;
+    return 0;
+}