[Buildroot] Analysis of autobuild failures 18-19/11

[Waldemar Brodkorb]

Hi Arnout,
Arnout Vandecappelle wrote,

> On 21-11-16 12:21, Waldemar Brodkorb wrote:
> > Hi,
> > Arnout Vandecappelle wrote,
> > 
> >>  Hi all,
> >>
> >>  Here's an analysis of autobuild failures. It looks a bit different from what
> >> Thomas usually sends because I based it on the website rather than the mail. I
> >> eliminated the ones that are already fixed in git, and also the powerpc64le
> >> failures that are due to libtool.m4.
> >>
> >>  I'm not putting the people from get-developers in Cc, because they already get
> >> these mails.
> >>
> >> http://autobuild.buildroot.net/results/d47fa41aa860d82471b83ac90967d3a3dacd8611
> >> m68k / 5208	lcdapi-v0.10	uclibc	static
> >>
> >>> /tmp/cc6S5lwR.s: Assembler messages:
> >>> /tmp/cc6S5lwR.s: Internal error, aborting at dw2gencfi.c:214 in emit_expr_encoded
> >>> Please report this bug.
> >>> Makefile:784: recipe for target 'lcdapi/api/liblcdapi_la-LCDHorizontalBar.lo' failed
> >>
> >>  ICE... Waldemar?
> > 
> > This could be avoided by using something like the following (example
> > for libasplib):
> > diff --git a/package/libasplib/libasplib.mk
> > b/package/libasplib/libasplib.mk
> > index 41aeaeb..b09d739 100644
> > --- a/package/libasplib/libasplib.mk
> > +++ b/package/libasplib/libasplib.mk
> > @@ -10,4 +10,11 @@ LIBASPLIB_LICENSE = GPLv3+
> >  LIBASPLIB_LICENSE_FILES = LICENSE
> >  LIBASPLIB_INSTALL_STAGING = YES
> >  
> > +# Internal error, aborting at dw2gencfi.c:214 in emit_expr_encoded
> > +ifeq ($(BR2_m68k_cf),y)
> > +LIBASPLIB_CXXFLAGS += -fno-dwarf2-cfi-asm
> > +endif
> > +
> > +LIBASPLIB_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) $(LIBASPLIB_CXXFLAGS)"
> > +
> >  $(eval $(cmake-package))
> > 
> > Unfortunately libasplib cmake infrastructure ignores my
> > CMAKE_CXX_FLAGS. 
> > 
> > The m68k/coldfire uclinux seems to have some limitation regarding
> > CFI assembly generation, as elf2flt lacks some features.
> > See here for the comment in the code of GNU as:
> > https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob;f=gas/config/tc-m68k.h;h=30ca2cb35e0b00048c52bda0dc04ae0cdef5cc3a;hb=HEAD#l180
> > 
> > With gcc -fno-dwarf2-cfi-asm we can disable the CFI generation and
> > at least fix the compile errors for those packages.
> >  
> > Not sure if it will break some exception handling in C++ code or if
> > it only disables the ability to debug the code.
> 
>  If it doesn't break things (and you can do runtime test, right?), maybe we
> should just pass -fno-dwarf2-cfi-asm in the wrapper for coldfire?

I don't know the internals of the wrapper, could you suggest a
patch, then I can do some testing with either Qemu or some real
board.

best regards
 Waldemar