Re: Bug 205663 Clang getting Bus Errors (arm SCLTR Bit[12]==1 context): Reported fixed on llvm's trunk

[Dimitry Andric]

On 09 Jan 2016, at 04:46, Mark Millard  wrote:
> 
> On 2016-Jan-7, at 2:57 PM, Dimitry Andric  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



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Re: Bug 205663 Clang getting Bus Errors (arm SCLTR Bit[12]==1 context): Reported fixed on llvm's trunk

[Ian Lepore]

On Sat, 2016-01-09 at 15:03 +0100, Dimitry Andric wrote:
> On 09 Jan 2016, at 04:46, Mark Millard  wrote:
> > 
> > On 2016-Jan-7, at 2:57 PM, Dimitry Andric 
> > 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 
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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