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

[Clemens Gruber <clemens.gruber@pqgruber.com>]

Hi,

On Mon, May 13, 2019 at 08:57:47PM +0200, Michael Olbrich wrote:
> 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.

Great, thanks! This fixes the m4 problem.

A few packages later, another problem popped up though. Probably not
related:

(...)
--------------------------------------------
target: host-autotools-automake.install.post
--------------------------------------------

sed: can't read .../toolchain/platform-../packages/host-automake-1.16.1/bin/*: No such file or directory
sed: can't read .../toolchain/platform-../packages/host-automake-1.16.1/share/automake-*/Automake/Config.pm: No such file or directory
make: *** [/usr/local/lib/ptxdist-2019.05.0/rules/host-autotools-automake.make:48: .../toolchain/platform-../state/host-autotools-automake.install.post] Error 2

--

I worked around it by removing the custom install stage from
host-autotools-auto(make|conf).make after copying them into the
toolchain rules directory.

Something else:
According to the selected_ptxconfig, HOST_AUTOTOOLS_AUTOMAKE is not
selected. Is this host dependency pulled in automatically without a
PTXCONF_HOST_AUTOTOOLS_AUTOMAKE=y in the ptxconfig file?

Thanks,
Clemens

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