r340025 - Fix for bug 38508 - Don't do PCH processing when only generating preprocessor output

[Erich Keane via cfe-commits]

Author: erichkeane
Date: Fri Aug 17 06:43:39 2018
New Revision: 340025

URL: http://llvm.org/viewvc/llvm-project?rev=340025&view=rev
Log:
Fix for bug 38508 - Don't do PCH processing when only generating preprocessor output

This clang-cl driver change removes the PCH options when we are only generating
preprocessed output. This is similar to the behavior of Y-.

Patch by: mikerice
Differential Revision: https://reviews.llvm.org/D50640

Added:
    cfe/trunk/test/PCH/Inputs/pch-through-use3c.cpp
    cfe/trunk/test/PCH/Inputs/pch-through3c.h
    cfe/trunk/test/PCH/pch-through3c.cpp
Modified:
    cfe/trunk/lib/Driver/Driver.cpp
    cfe/trunk/test/Driver/cl-pch.cpp

Modified: cfe/trunk/lib/Driver/Driver.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Driver.cpp?rev=340025&r1=340024&r2=340025&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Driver.cpp (original)
+++ cfe/trunk/lib/Driver/Driver.cpp Fri Aug 17 06:43:39 2018
@@ -3010,9 +3010,10 @@ void Driver::BuildActions(Compilation &C
     Args.eraseArg(options::OPT__SLASH_Yc);
     YcArg = nullptr;
   }
-  if (Args.hasArg(options::OPT__SLASH_Y_)) {
-    // /Y- disables all pch handling.  Rather than check for it everywhere,
-    // just remove clang-cl pch-related flags here.
+  if (FinalPhase == phases::Preprocess || Args.hasArg(options::OPT__SLASH_Y_)) {
+    // If only preprocessing or /Y- is used, all pch handling is disabled.
+    // Rather than check for it everywhere, just remove clang-cl pch-related
+    // flags here.
     Args.eraseArg(options::OPT__SLASH_Fp);
     Args.eraseArg(options::OPT__SLASH_Yc);
     Args.eraseArg(options::OPT__SLASH_Yu);

Modified: cfe/trunk/test/Driver/cl-pch.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/cl-pch.cpp?rev=340025&r1=340024&r2=340025&view=diff
==============================================================================
--- cfe/trunk/test/Driver/cl-pch.cpp (original)
+++ cfe/trunk/test/Driver/cl-pch.cpp Fri Aug 17 06:43:39 2018
@@ -345,3 +345,24 @@
 // CHECK-NoSourceTP: pchfile.pch
 // CHECK-NoSourceTP: -x
 // CHECK-NoSourceTP: "c++"
+
+// If only preprocessing, PCH options are ignored.
+// RUN: %clang_cl /P /Ycpchfile.h /FIpchfile.h /c -### -- %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-YC-P %s
+// CHECK-YC-P-NOT: -emit-pch
+// CHECK-YC-P-NOT: -include-pch
+
+// RUN: %clang_cl /E /Ycpchfile.h /FIpchfile.h /c -### -- %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-YC-E %s
+// CHECK-YC-E-NOT: -emit-pch
+// CHECK-YC-E-NOT: -include-pch
+
+// RUN: %clang_cl /P /Ycpchfile.h /FIpchfile.h /c -### -- %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-YU-P %s
+// CHECK-YU-P-NOT: -emit-pch
+// CHECK-YU-P-NOT: -include-pch
+
+// RUN: %clang_cl /E /Ycpchfile.h /FIpchfile.h /c -### -- %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-YU-E %s
+// CHECK-YU-E-NOT: -emit-pch
+// CHECK-YU-E-NOT: -include-pch

Added: cfe/trunk/test/PCH/Inputs/pch-through-use3c.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/PCH/Inputs/pch-through-use3c.cpp?rev=340025&view=auto
==============================================================================
--- cfe/trunk/test/PCH/Inputs/pch-through-use3c.cpp (added)
+++ cfe/trunk/test/PCH/Inputs/pch-through-use3c.cpp Fri Aug 17 06:43:39 2018
@@ -0,0 +1,2 @@
+int a = A;
+// expected-no-diagnostics

Added: cfe/trunk/test/PCH/Inputs/pch-through3c.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/PCH/Inputs/pch-through3c.h?rev=340025&view=auto
==============================================================================
--- cfe/trunk/test/PCH/Inputs/pch-through3c.h (added)
+++ cfe/trunk/test/PCH/Inputs/pch-through3c.h Fri Aug 17 06:43:39 2018
@@ -0,0 +1 @@
+#define A 1

Added: cfe/trunk/test/PCH/pch-through3c.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/PCH/pch-through3c.cpp?rev=340025&view=auto
==============================================================================
--- cfe/trunk/test/PCH/pch-through3c.cpp (added)
+++ cfe/trunk/test/PCH/pch-through3c.cpp Fri Aug 17 06:43:39 2018
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -I %S -emit-pch \
+// RUN:   -include Inputs/pch-through3c.h \
+// RUN:   -pch-through-header=Inputs/pch-through3c.h -o %t.3c %s
+
+// RUN: %clang_cc1 -verify -I %S -include-pch %t.3c \
+// RUN:   -include Inputs/pch-through3c.h \
+// RUN:   -pch-through-header=Inputs/pch-through3c.h \
+// RUN:   %S/Inputs/pch-through-use3c.cpp 2>&1