From 7e85e7ced7079d620ae73f8664a68530992c6af1 Mon Sep 17 00:00:00 2001
From: Andreas Holzammer <andreas.holzammer@kdab.com>
Date: Wed, 10 Feb 2016 13:05:26 +0100
Subject: Add initial clang-cl support to Qt

This adds the functionality to build Qt with clang under Windows against
the Microsoft Visual Studio 2015 runtime.

In order to replicate this, a Clang 3.8 build with Visual Studio 2015
Update 1 is needed.

Adds compiler detection to Qt to distinguish correctly the clang compiler
and Windows with Visual Studio.

Clang has some built-in numeric functions, there is no need to use the
Microsoft versions, which also conflict here.

Task-number: QTBUG-50804
Change-Id: Ia4b267a298310ac7d73edf473b12792991249d8a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
---
 qmake/Makefile.win32 | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

(limited to 'qmake')

diff --git a/qmake/Makefile.win32 b/qmake/Makefile.win32
index 1e8c5129be..1d50f872d9 100644
--- a/qmake/Makefile.win32
+++ b/qmake/Makefile.win32
@@ -14,6 +14,10 @@ QMKSRC = $(SOURCE_PATH)\qmake
 CXX               = icl
 LINKER            = link
 CFLAGS_EXTRA      = /Zc:forScope /Qstd=c++11
+!elseif "$(QMAKESPEC)" == "win32-clang-msvc2015"
+CXX               = clang-cl
+LINKER            = link
+CFLAGS_EXTRA      = -fms-compatibility-version=19.00.23506 -Wno-microsoft-enum-value
 !else
 CXX               = cl
 LINKER            = link
@@ -21,13 +25,18 @@ LINKER            = link
 CFLAGS_EXTRA      = /Zc:wchar_t-
 !  elseif "$(QMAKESPEC)" == "win32-msvc2008" || "$(QMAKESPEC)" == "win32-msvc2010" || "$(QMAKESPEC)" == "win32-msvc2012" || "$(QMAKESPEC)" == "win32-msvc2013"
 CFLAGS_EXTRA      = /MP /D_CRT_SECURE_NO_WARNINGS /D_SCL_SECURE_NO_WARNINGS $(CFLAGS_CRT)
-!  elseif "$(QMAKESPEC)" == "win32-msvc2015"
+!  elseif "$(QMAKESPEC)" == "win32-msvc2015" || "$(QMAKESPEC)" == "win32-clang-msvc2015"
 CFLAGS_EXTRA      = /MP /D_CRT_SECURE_NO_WARNINGS /D_SCL_SECURE_NO_WARNINGS /Zc:strictStrings /w44456 /w44457 /w44458 /wd4577 $(CFLAGS_CRT)
 !  else
 !    error Unsupported compiler for this Makefile
 !  endif
 !endif  # !win32-icc
 
+!if "$(QMAKESPEC)" != "win32-clang-msvc2015"
+CFLAGS_PCH        = -Yuqmake_pch.h -FIqmake_pch.h -Fpqmake_pch.pch
+PCH_OBJECT        = qmake_pch.obj
+!endif
+
 CFLAGS_BARE = -c -Fo./ -Fdqmake.pdb \
               -W3 -nologo -O1 \
               $(CFLAGS_EXTRA) \
@@ -41,7 +50,7 @@ CFLAGS_BARE = -c -Fo./ -Fdqmake.pdb \
               -DQT_NO_TEXTCODEC -DQT_NO_UNICODETABLES -DQT_NO_COMPONENT -DQT_NO_COMPRESS \
               -DQT_NO_THREAD -DQT_NO_QOBJECT -DQT_NO_GEOM_VARIANT -DQT_NO_DATASTREAM \
               -DUNICODE -DQT_CRYPTOGRAPHICHASH_ONLY_SHA1 -DQT_JSON_READONLY -DQT_NO_STANDARDPATHS
-CFLAGS   = -Yuqmake_pch.h -FIqmake_pch.h -Fpqmake_pch.pch $(CFLAGS_BARE) $(CFLAGS)
+CFLAGS   = $(CFLAGS_PCH) $(CFLAGS_BARE) $(CFLAGS)
 
 CXXFLAGS_BARE = $(CFLAGS_BARE)
 CXXFLAGS = $(CFLAGS)
@@ -129,7 +138,7 @@ QTOBJS= \
 first all: qmake.exe
 
 qmake.exe: $(OBJS) $(QTOBJS)
-	$(LINKQMAKE) qmake_pch.obj
+	$(LINKQMAKE) $(PCH_OBJECT)
 	-copy qmake.exe $(BUILD_PATH)\bin\qmake.exe
 
 clean::
@@ -158,9 +167,9 @@ distclean:: clean
 .cxx.obj:
 	$(CXX) $(CXXFLAGS) $<
 
-$(OBJS): qmake_pch.obj
+$(OBJS): $(PCH_OBJECT)
 
-$(QTOBJS): qmake_pch.obj
+$(QTOBJS): $(PCH_OBJECT)
 
 qlibraryinfo.obj: $(BUILD_PATH)\src\corelib\global\qconfig.cpp
 
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