Re: [ptxdist] Toolchain: host-m4 build error

[Michael Olbrich <m.olbrich@pengutronix.de>]

Hi,

On Mon, May 13, 2019 at 03:49:18PM +0200, Clemens Gruber wrote:
> On Mon, May 13, 2019 at 07:48:59AM +0200, Michael Olbrich wrote:
> > On Mon, May 13, 2019 at 12:43:59AM +0200, Clemens Gruber wrote:
> > > when building a toolchain based on OSELAS.Toolchain-2018.02.x, I get the
> > > following error at the end of the host-m4 build, in the install.pack
> > > stage:
> > > 
> > > new rpath '${ORIGIN}/../lib' too large; maximum length 4
> > > 
> > > ptxdist: error: Failed to adjust rpath for '~/toolchain/platform-../packages/host-m4-1.4.18/bin/m4'
> > > 
> > > --
> > > 
> > > readelf tells me:
> > > ...
> > > 0x000000000000000f (RPATH)              Library rpath: [/lib]
> > > ...
> > > 
> > > So there is not enough space to put in ${ORIGIN}/../lib
> > > 
> > > --
> > > 
> > > Any idea why this is only happening in the toolchain build and how to
> > > fix it?
> > > 
> > > Host OS: ArchLinux
> > > Host GCC: 8.3.0
> > > PTXdist: 2019.05.0
> > 
> > I've heard of this error, but I've never seen it myself.
> > Can you do the following:
> > $ ptxdist clean host-m4
> > Then move / remove platform-.../logfile
> > $ ptxdist -v install host-m4
> > And then send the logfile.
> > 
> > The gcc wrapper should be used when host-m4 is compiled. And it should add
> > a longer rpath. With '-v' the wrapper will write the full commandline, so
> > we can see where the rpath is lost.
> 
> I am sending the logfile attached to this message.
[...]
> gcc   -g -O2   -o m4 m4.o builtin.o debug.o eval.o format.o freeze.o input.o macro.o output.o path.o symtab.o ../lib/libm4.a  /lib/libsigsegv.so -Wl,-rpath -Wl,/lib  
> wrapper:  gcc  -Wl,--as-needed -isystem /home/clemens/Dev/gruberzr-toolchain/platform-arm-v7a-linux-gnueabihf-gcc-8.2.1-glibc-2.28-binutils-2.31.1-kernel-4.19-sanitized/sysroot-host/include   -g -O2 -o m4 m4.o builtin.o debug.o eval.o format.o freeze.o input.o macro.o output.o path.o symtab.o ../lib/libm4.a /lib/libsigsegv.so -Wl,-rpath -Wl,/lib  -L/home/clemens/Dev/gruberzr-toolchain/platform-arm-v7a-linux-gnueabihf-gcc-8.2.1-glibc-2.28-binutils-2.31.1-kernel-4.19-sanitized/sysroot-host/lib
[...]

Right, I see the problem. The toolchain overwrites PTXDIST_HOST_LDFLAGS to
_not_ add the rpath. This is correct because the toolchain avoids any extra
shared libraries. And when this was implemented, this was done to avoid
leaking any absolute paths into the toolchain binaries.

This works in most cases, because the end result is no rpath at all. And
PTXdist will skip calling chrpath.
For some reason, the m4 build system adds the '-Wl,-rpath -Wl,/lib' so
there is a rpath. PTXdist tries to change it an fails.

Try adding configure options for host-m4 that include --disable-rpath.
Does that help?

I'm currently testing a patch for ptxdist upstream that does this. It
should be in master some time this week.

Michael

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