On Sat, 2016-01-09 at 15:03 +0100, Dimitry Andric wrote:
> On 09 Jan 2016, at 04:46, Mark Millard <mar...@dsl-only.net> wrote:
> >
> > On 2016-Jan-7, at 2:57 PM, Dimitry Andric <dim at FreeBSD.org>
> > wrote:
> ...
> > > FYI, I have added a -mno-movt option for this purpose upstream,
> > > and
> > > imported a newer snapshot into the clang380-import branch. As of
> > > r293384, it now uses the new option spelling for modules, if your
> > > clang
> > > is 3.8.0 or higher.
> > >
> > > -Dimitry
> >
> > I've not been able to get to the point of running clang++ 3.8 on
> > the rpi2 yet: R_ARM_CALL and R_ARM_JUMP24 relocation truncations
> > during the cross build's buildworld interfere.
>
> Yes, this is caused by too large call distances. In other words, the
> clang executable is getting to big to link. Apparently we need to do
> some tricks with -mlongcall to fix this. As I am no arm expert, I
> welcome any patch submissions. :-)
>
> -Dimitry
>
Here's the patch I got from Andy for the clang380 branch, modified with
Warner's suggestion to use MACHINE_CPUARCH instead of MACHINE. With
this I can get a working arm world that will build a runnable
helloworld.c (and .cc) on a dreamplug. (I.e., it appears clang 3.8.0
fixes the problem we had with clang 3.7.x where it wouldn't run at all
on armv4/5 systems). I have not tried compling anything complex yet.
-- Ian
Index: lib/clang/clang.lib.mk
===================================================================
--- lib/clang/clang.lib.mk (revision 293584)
+++ lib/clang/clang.lib.mk (working copy)
@@ -6,4 +6,8 @@ LLVM_SRCS= ${.CURDIR}/../../../contrib/llvm
INTERNALLIB=
+.if ${MACHINE_CPUARCH} == "arm"
+STATIC_CXXFLAGS+=-mlong-calls
+.endif
+
.include <bsd.lib.mk>
Index: lib/csu/arm/Makefile
===================================================================
--- lib/csu/arm/Makefile (revision 293584)
+++ lib/csu/arm/Makefile (working copy)
@@ -23,7 +23,7 @@ CLEANFILES+= crt1.s gcrt1.s Scrt1.s
# directly compiled to .o files.
crt1.s: crt1.c
- ${CC} ${CFLAGS} -S -o ${.TARGET} ${.CURDIR}/crt1.c
+ ${CC} ${CFLAGS} -mlong-calls -S -o ${.TARGET} ${.CURDIR}/crt1.c
sed ${SED_FIX_NOTE} ${.TARGET}
crt1.o: crt1.s
@@ -30,7 +30,7 @@ crt1.o: crt1.s
${CC} ${ACFLAGS} -c -o ${.TARGET} crt1.s
gcrt1.s: crt1.c
- ${CC} ${CFLAGS} -DGCRT -S -o ${.TARGET} ${.CURDIR}/crt1.c
+ ${CC} ${CFLAGS} -mlong-calls -DGCRT -S -o ${.TARGET} ${.CURDIR}/crt1.c
sed ${SED_FIX_NOTE} ${.TARGET}
gcrt1.o: gcrt1.s
Index: usr.bin/clang/clang/Makefile
===================================================================
--- usr.bin/clang/clang/Makefile (revision 293584)
+++ usr.bin/clang/clang/Makefile (working copy)
@@ -11,7 +11,11 @@ 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++ \
${BINDIR}/clang ${BINDIR}/clang-cpp
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