[yocto] Unable to cross compile libgfortran for arm64

[Khem Raj]

It will be intrrrdting to see if we still have this issue on master

On Thu, Jan 10, 2019 at 5:29 AM Sergio Paracuellos <
sergio.paracuellos at gmail.com> wrote:

> On Wed, Jan 9, 2019 at 8:17 AM Sergio Paracuellos
> <sergio.paracuellos at gmail.com> wrote:
> >
> > Hi all,
> >
> > I am trying to compile a complete system with fortran support using
> > yocto and I am having problems cross compiling libgfortran. The target
> > architecture is arm64 because the system will run in a xilinx mpsoc
> > based board. I need fortran support to compile lapack, openblas, scipy
> > and other python stuff that seems to need them. The yocto branch I am
> > using is the stable 'sumo'. So I do the following for enable fortran
> > support:
> >
> > 1) Add to my local.conf the following line:
> > FORTRAN_forcevariable = ",fortran"
> > 2) Add a bbappend file for recipes-devtools/gcc/gcc-runtime_7.3.bb with:
> > RUNTIMETARGET += "libgfortran"
>
> It seems this RUNTIMETARGET not needed anymore since libgfortran has
> now its own recipe.
> Setting FORTRAN_forcevariable = ",fortran" in local.conf and adding to the
> image
> the following:
> ...
> FORTRAN_TOOLS = " \
>     gfortran \
>     gfortran-symlinks \
>     libgfortran \
>     libgfortran-dev \
>  "
> ...
> IMAGE_INSTALL += " \
>     ...
>     ${FORTRAN_TOOLS} \
>     ...
>  "
>
> seems to work as it is without any patches. Sorry for the noise.
>
> Best regards,
>     Sergio Paracuellos
>
> >
> > With the branch as it is when gcc-runtime is being build I end up with
> > an error because libbacktrace headers can't be found so I have to
> > apply the following PATCH to solve this first issue:
> >
> > diff -Naur gcc-7.3.0/libgfortran/Makefile.in
> > gcc-7.3.0.modif/libgfortran/Makefile.in
> > --- gcc-7.3.0/libgfortran/Makefile.in 2018-01-25 09:17:54.059232055 +0100
> > +++ gcc-7.3.0.modif/libgfortran/Makefile.in 2019-01-08
> 12:42:00.583138367 +0100
> > @@ -582,7 +582,7 @@
> >  toolexeclib_DATA = libgfortran.spec
> >  libgfortran_la_LINK = $(LINK) $(libgfortran_la_LDFLAGS)
> >  libgfortran_la_LDFLAGS = -version-info `grep -v '^\#'
> > $(srcdir)/libtool-version` \
> > - $(LTLDFLAGS) $(LIBQUADLIB) ../libbacktrace/libbacktrace.la \
> > + $(LTLDFLAGS) $(LIBQUADLIB) ../../libbacktrace/libbacktrace.la \
> >   $(HWCAP_LDFLAGS) \
> >   -lm $(extra_ldflags_libgfortran) \
> >   $(version_arg) -Wc,-shared-libgcc
> > @@ -603,7 +603,7 @@
> >        -I$(MULTIBUILDTOP)../libgcc \
> >        -I$(srcdir)/$(MULTISRCTOP)../libbacktrace \
> >        -I$(MULTIBUILDTOP)../libbacktrace \
> > -      -I../libbacktrace
> > +      -I../../libbacktrace
> >
> > But then I get the following error:
> >
> > |
> /home/sergio/YOCTO/build/tmp/work/aarch64-poky-linux/gcc-runtime/7.3.0-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/../../libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/7.3.0/ld:
> > ../../libbacktrace/.libs/libbacktrace.a(dwarf.o): Relocations in
> > generic ELF (EM: 62)
> > |
> /home/sergio/YOCTO/build/tmp/work/aarch64-poky-linux/gcc-runtime/7.3.0-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/../../libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/7.3.0/ld:
> > ../../libbacktrace/.libs/libbacktrace.a(dwarf.o): Relocations in
> > generic ELF (EM: 62)
> > |
> /home/sergio/YOCTO/build/tmp/work/aarch64-poky-linux/gcc-runtime/7.3.0-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/../../libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/7.3.0/ld:
> > ../../libbacktrace/.libs/libbacktrace.a(dwarf.o): Relocations in
> > generic ELF (EM: 62)
> > | ../../libbacktrace/.libs/libbacktrace.a(dwarf.o): error adding
> > symbols: File in wrong format
> > | collect2: error: ld returned 1 exit status
> > | Makefile:1364: recipe for target 'libgfortran.la' failed
> > | make[1]: *** [libgfortran.la] Error 1
> > | make[1]: Leaving directory
> >
> '/home/sergio/YOCTO/build/tmp/work/aarch64-poky-linux/gcc-runtime/7.3.0-r0/gcc-7.3.0/build.aarch64-poky-linux.aarch64-poky-linux/aarch64-poky-linux/libgfortran'
> > | Makefile:1242: recipe for target 'all' failed
> > | make: *** [all] Error 2
> > | ERROR: oe_runmake failed
> > | WARNING: exit code 1 from a shell command.
> > | ERROR: Function failed: do_compile (log file is located at
> >
> /home/sergio/YOCTO/build/tmp/work/aarch64-poky-linux/gcc-runtime/7.3.0-r0/temp/log.do_compile.24547)
> > ERROR: Task
> (/home/sergio/YOCTO/workspace/poky/meta/recipes-devtools/gcc/gcc-runtime_7.3.bb:
> do_compile)
> > failed with exit code '1'
> >
> > So It seems that libbacktrace is always built for my host architecture
> > instead of for arm64 bits...
> > Is this a known problem? Am I doing something wrong?
> >
> > Thanks in advance for your time.
> >
> > Best regards,
> >     Sergio Paracuellos
> >
> > PD: I updated this info also in a bug related here which seems to be
> > fixed https://bugzilla.yoctoproject.org/show_bug.cgi?id=12394
> --
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