Fix build with more than one version of Python 3.x installed. [0]

Fix C++ library selection with certain targets. [1]

PR:		248386 [1], 248488 [0]
Submitted by:	Greg V [1], John Hein [0]

devel/llvm11/Makefile

@@ -2,7 +2,7 @@
 
 PORTNAME=	llvm
 DISTVERSION=	11.0.0rc1
-PORTREVISION=	0
+PORTREVISION=	1
 CATEGORIES=	devel lang
 MASTER_SITES=	https://github.com/llvm/llvm-project/releases/download/llvmorg-${DISTVERSION:S/rc/-rc/}/ \
 		https://${PRE_}releases.llvm.org/${LLVM_RELEASE}/${RCDIR}
@@ -55,9 +55,7 @@ CMAKE_ARGS+=	-DLLVM_HOST_TRIPLE=${CONFIGURE_TARGET}
 CMAKE_ARGS+=	-DCMAKE_INSTALL_MANDIR:PATH="share/man"
 CMAKE_ARGS+=	-DLLVM_PARALLEL_LINK_JOBS=1
 CMAKE_ARGS+=	-DLLVM_ENABLE_Z3_SOLVER=OFF
-CMAKE_ARGS+=	-DPYTHON_EXECUTABLE=${PYTHON_CMD} \
-		-DPYTHON_INCLUDE_DIR=${PYTHON_INCLUDEDIR} \
-		-DPYTHON_LIBRARY=${LOCALBASE}/lib/lib${PYTHON_VERSION}${PYTHON_ABIVER}.so
+CMAKE_ARGS+=	-DPython3_EXECUTABLE=${PYTHON_CMD}
 
 # Disable assertions.  They should be disabled by cmake, but USES=cmake
 # overrides -DCMAKE_*_FLAGS_RELEASE.

devel/llvm11/files/clang/patch-D77776

@@ -0,0 +1,20 @@
+[Driver] Default to libc++ on FreeBSD
+
+Downstream may naively translate between DSL and LLVM target
+triple. If OS version is lost in the process then Clang would
+default to a version that's no longer supported by OS vendor.
+
+https://reviews.llvm.org/D77776
+
+--- tools/clang/lib/Driver/ToolChains/FreeBSD.cpp.orig	2019-12-11 19:15:30 UTC
++++ tools/clang/lib/Driver/ToolChains/FreeBSD.cpp
+@@ -351,7 +351,8 @@ FreeBSD::FreeBSD(const Driver &D, const llvm::Triple &
+ }
+
+ ToolChain::CXXStdlibType FreeBSD::GetDefaultCXXStdlibType() const {
+-  if (getTriple().getOSMajorVersion() >= 10)
++  unsigned Major = getTriple().getOSMajorVersion();
++  if (Major >= 10 || Major == 0)
+     return ToolChain::CST_Libcxx;
+   return ToolChain::CST_Libstdcxx;
+ }