enable build of glew + opencsg with clang from script

openscad.pro

@@ -109,6 +109,8 @@ netbsd* {
 	QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-variable
 	QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-function
 	QMAKE_CXXFLAGS_WARN_ON += -Wno-c++11-extensions
+	# might want to actually turn this on once in a while
+	QMAKE_CXXFLAGS_WARN_ON += -Wno-sign-compare
 }
 
 CONFIG(skip-version-check) {

scripts/linux-build-dependencies.sh

@@ -120,7 +120,8 @@ build_boost()
   ./bootstrap.sh --prefix=$DEPLOYDIR --with-libraries=thread,program_options,filesystem,system,regex
 	if [ $CXX ]; then
 		if [ $CXX = "clang" ]; then
-		  ./b2 -j$NUMCPU toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++" install
+		  ./b2 -j$NUMCPU toolset=clang install
+		  # ./b2 -j$NUMCPU toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++" install
 		fi
 	else
 	  ./b2 -j$NUMCPU
@@ -171,7 +172,14 @@ build_glew()
     sed -ibak s/"\-lXmu"/"\-L\/usr\/lib64\/libXmu.so.6"/ config/Makefile.linux
   fi
 
-  GLEW_DEST=$DEPLOYDIR make -j$NUMCPU
+	if [ $CC ]; then
+		if [ $CC = "clang" ]; then
+			echo "modifying glew makefile for clang"
+			sed -i s/\$\(CC\)/clang/ Makefile
+		fi
+	fi
+
+	GLEW_DEST=$DEPLOYDIR make -j$NUMCPU
   GLEW_DEST=$DEPLOYDIR make install
 }
 
@@ -195,10 +203,20 @@ build_opencsg()
   fi
 
   if [ "`command -v qmake-qt4`" ]; then
-    qmake-qt4
+    OPCSG_QM = qmake-qt4
   else
-    qmake
+    OPCSG_QM = qmake
   fi
+
+	if [ $CXX ]; then
+		if [ $CXX = "clang++" ]; then
+		  cd $BASEDIR/src/opencsg-$version/src
+			$(OPCSG_QM)
+		  cd $BASEDIR/src/opencsg-$version
+			$(OPCSG_QM)
+		fi
+	fi
+
   make
   cp -av lib/* $DEPLOYDIR/lib
   cp -av include/* $DEPLOYDIR/include

scripts/setenv-linbuild-clang.sh

@@ -1,8 +1,12 @@
-# build dependencies and openscad on linux with clang.
+# build dependencies and/or openscad on linux with the clang compiler
 
 export CC=clang
 export CXX=clang++
 export QMAKESPEC=unsupported/linux-clang
 
+echo CC has been modified: $CC
+echo CXX has been modified: $CXX
+echo QMAKESPEC has been modified: $QMAKESPEC
+
 . ./scripts/setenv-linbuild.sh