Set -mlong-calls where needed to get a static clang and lldb 3.8.0

linking. These are too large for a branch instruction to branch from an
earlier point in the code to somewhere later.

This will also allow these to be build with Thumb-2 when we get this
infrastructure.

Reviewed by:	dim
Differential Revision:	https://reviews.freebsd.org/D4855

lib/clang/clang.lib.mk

@@ -6,4 +6,8 @@ LLVM_SRCS= ${.CURDIR}/../../../contrib/llvm
 
 INTERNALLIB=
 
+.if ${MACHINE_CPUARCH} == "arm"
+STATIC_CXXFLAGS+= -mlong-calls
+.endif
+
 .include <bsd.lib.mk>

lib/libc++/Makefile

@@ -6,6 +6,9 @@ _LIBCXXRTDIR=	${.CURDIR}/../../contrib/libcxxrt
 HDRDIR=		${.CURDIR}/../../contrib/libc++/include
 SRCDIR=		${.CURDIR}/../../contrib/libc++/src
 CXXINCLUDEDIR=	${INCLUDEDIR}/c++/v${SHLIB_MAJOR}
+.if ${MACHINE_CPUARCH} == "arm"
+STATIC_CXXFLAGS+= -mlong-calls
+.endif
 
 .PATH: ${SRCDIR}
 

usr.bin/clang/clang/Makefile

@@ -11,6 +11,10 @@ SRCS=	cc1_main.cpp \
 
 .if ${MK_SHARED_TOOLCHAIN} == "no"
 NO_SHARED?= yes
+
+.if ${MACHINE_CPUARCH} == "arm"
+CFLAGS+= -mlong-calls
+.endif
 .endif
 
 LINKS=	${BINDIR}/clang ${BINDIR}/clang++ \

usr.bin/clang/lldb/Makefile

@@ -8,6 +8,9 @@ LLDB_SRCS=${.CURDIR}/../../../contrib/llvm/tools/lldb
 
 CFLAGS+=	-I${LLDB_SRCS}/include
 CXXFLAGS+=	-std=c++11
+.if ${MACHINE_CPUARCH} == "arm"
+CFLAGS+=	-mlong-calls
+.endif
 
 SRCDIR=	tools/lldb/tools/driver
 SRCS=	Driver.cpp \