cdbext: add option to skip cdb detection

Since a few windows sdk versions are the headers and libs of the
debugger part of the sdk installation. Add an option to sdkip the cdb
detection and fall back to use these headers and libs that are already
configured in INCLUDE and LIBS of the vcvars.bat environment.

Change-Id: If1eeecdbae34523ddbcc1a22d8640df7fa46bf6a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/libs.pro

@@ -67,6 +67,10 @@ win32:SUBDIRS += utils/process_ctrlc_stub.pro
 
 # Windows: Compile Qt Creator CDB extension if Debugging tools can be detected.
 win32: isEmpty(QTC_SKIP_CDBEXT) {
+    CDB_NO_AUTODETECT = $$(CDB_NO_AUTODETECT) #use the debugger header and lib defined in INCLUDE and LIB env var
+    !isEmpty(CDB_NO_AUTODETECT) {
+        SUBDIRS += qtcreatorcdbext
+    } else {
         include(qtcreatorcdbext/cdb_detect.pri)
         !isEmpty(CDB_PATH): exists($$CDB_PATH) {
             SUBDIRS += qtcreatorcdbext
@@ -75,6 +79,7 @@ win32: isEmpty(QTC_SKIP_CDBEXT) {
             message("If CDB is installed in a none default path define a CDB_PATH")
             message("environment variable pointing to your CDB installation.")
         }
+    }
 }
 
 QMAKE_EXTRA_TARGETS += deployqt # dummy

src/libs/qtcreatorcdbext/cdb_detect.pri

@@ -2,7 +2,8 @@
 # in case MS VS compilers are used.
 
 CDB_PATH=""
-msvc {
+CDB_NO_AUTODETECT = $$(CDB_NO_AUTODETECT) #use the debugger header and lib defined in INCLUDE and LIB env var
+isEmpty(CDB_NO_AUTODETECT): msvc {
     CDB_PATH="$$(CDB_PATH)"
     isEmpty(CDB_PATH):CDB_PATH="$$(ProgramFiles)/Debugging Tools For Windows/sdk"
     !exists($$CDB_PATH):CDB_PATH="$$(ProgramFiles)/Debugging Tools For Windows (x86)/sdk"

src/libs/qtcreatorcdbext/qtcreatorcdbext.pro

@@ -36,39 +36,46 @@ contains(ENV_TARGET_ARCH, .*64$) {
     DIRNAME=$${BASENAME}64
     CDB_PLATFORM=amd64
 
+    !isEmpty(CDB_PATH) {
         exists($$CDB_PATH/lib/amd64) {
-        LIBS+= -L$$CDB_PATH/lib/amd64 -ldbgeng
+            LIBS+= -L$$CDB_PATH/lib/amd64
         } else {
-        LIBS+= -L$$CDB_PATH/lib/x64 -ldbgeng
+            LIBS+= -L$$CDB_PATH/lib/x64
+        }
     }
 } else:isEmpty(ENV_TARGET_ARCH):contains(ENV_LIBPATH, ^.*amd64.*$) {
     DIRNAME=$${BASENAME}64
     CDB_PLATFORM=amd64
 
+
+    !isEmpty(CDB_PATH) {
         exists($$CDB_PATH/lib/amd64) {
-        LIBS+= -L$$CDB_PATH/lib/amd64 -ldbgeng
+            LIBS+= -L$$CDB_PATH/lib/amd64
         } else {
-        LIBS+= -L$$CDB_PATH/lib/x64 -ldbgeng
+            LIBS+= -L$$CDB_PATH/lib/x64
+        }
     }
 } else {
     DIRNAME=$${BASENAME}32
     CDB_PLATFORM=i386
 
+    !isEmpty(CDB_PATH) {
         exists($$CDB_PATH/lib/i386}) {
-        LIBS+= -L$$CDB_PATH/lib/i386 -ldbgeng
+            LIBS+= -L$$CDB_PATH/lib/i386
         } else {
-        LIBS+= -L$$CDB_PATH/lib/x86 -ldbgeng
+            LIBS+= -L$$CDB_PATH/lib/x86
+        }
     }
 }
 
-LIBS+=-luser32
+LIBS+=-ldbgeng -luser32
 
 DESTDIR=$$IDE_BUILD_TREE/lib/$${DIRNAME}
 TARGET = $$BASENAME
 
 message("Compiling Qt Creator CDB extension $$TARGET $$DESTDIR for $$CDB_PLATFORM using $$CDB_PATH")
 
-INCLUDEPATH += $$CDB_PATH/inc
+!isEmpty(CDB_PATH): INCLUDEPATH += $$CDB_PATH/inc
 
 CONFIG -= qt
 QT -= gui