Bug 12394

Summary: Libgfortran broken for cross-compilation
Product: [Build System, Metadata & Runtime] OE-Core Reporter: Nick Clark <nicholas.clark>
Component: devtools / tool chainAssignee: Richard Purdie <richard.purdie>
Status: RESOLVED FIXED QA Contact:
Severity: major    
Priority: Medium CC: matthias.schoepfer, meta.mr.watcher, meta.watcher, randy.macleod, sergio.paracuellos
Version: 2.4.1   
Target Milestone: 2.1.4   
Hardware: All   
OS: arm   
Whiteboard:
OS type for building Yocto: --- Type of Regression: ---
Verified: Documentation change: Don't know
Attachments:
Description Flags
Full error log bitbake libgfortran with MACHINE="qemux86_64" none

Description Nick Clark 2017-12-04 21:43:55 UTC 
Libgfortran doesn't appear to compile correctly on the latest Rocko (or on Morty, and presumably Pyro too).

I can enable fortran support by adding 'FORTRAN_forcevariable = ",fortran"' to my local.conf, which (I think) should enable Fortran in gcc/libgcc, and should allow me to build the libgfortran target.

I'm uncertain whether it works when compiling for on/for x86-64, but it doesn't seem to work when compiling on an x86-64 host for an ARM target.

With no patches, the build errors out because it can't find compiled libraries/headers for libbacktrace.

If I manually add the header paths as extra CFLAGS during libgfortran.inc's do_comfigure() step, I can get all the way to linking before the build complains about not being able to find libbacktrace.la. If I manually add the path to libgfortran's Makefile.in (similar to this patch:
https://www.mail-archive.com/openembedded-core@lists.openembedded.org/msg98445.html ), I get a little farther and then eventually get a failure that resembles:

libbacktrace.a(atomic.o) in archive is not an object

With no Fortran support, I can't make an LAPACK recipe and thus I can't use most linear algebra libraries/tools on target.
Comment 1 Nick Clark 2017-12-04 22:04:06 UTC 
Some extra notes. It seems that libbacktrace is always built for my host architecture (x86-64), regardless of what the target is.

So on my machine, the archive:

build/tmp/${MACHINE}/${DISTRO}/work/cortexa9hf-neon-ua-linux-gnueabi/gcc-runtime/7.2.0-r0/gcc-7.2.0/build.arm-ua-linux-gnueabi.arm-ua-linux-gnueabi/libbacktrace/libbacktrace.la

appears to contain x86-64 .o's instead of ARM.
Comment 2 Richard Purdie 2017-12-19 11:53:29 UTC 
I've sent a patch which fixes this against master and also added a test for this to oe-selftest.
Comment 3 Matthias Schoepfer 2017-12-21 10:17:20 UTC 
Created attachment 4162 [details]
Full error log bitbake libgfortran with MACHINE="qemux86_64"
Comment 4 Matthias Schoepfer 2017-12-21 10:19:16 UTC 
Hi there,

I am stuck with the same problem. I tried the afore mentioned patch (regarding libbacktrace in Makefile.am / Makefile.in), but no luck:

ERROR: libgfortran-7.2.0-r0 do_packagedata: The recipe libgfortran is trying to install files into a shared area when those files already exist. Those files and their manifest location are:
  /home/mschoepf/identpro/yocto/ros-devel/tmp/pkgdata/qemux86-64/runtime/libgfortran
    (matched in manifest-qemux86-64-gcc-runtime.packagedata)
  /home/mschoepf/identpro/yocto/ros-devel/tmp/pkgdata/qemux86-64/runtime/libgfortran-dev
    (matched in manifest-qemux86-64-gcc-runtime.packagedata)
  /home/mschoepf/identpro/yocto/ros-devel/tmp/pkgdata/qemux86-64/runtime/libgfortran-staticdev
    (matched in manifest-qemux86-64-gcc-runtime.packagedata)
Please verify which recipe should provide the above files.


Can you please post you patch or where to find it. I searched in poky master but could not find it there...

Thanks and Regards,

  Matthias
Comment 5 Matthias Schoepfer 2017-12-21 10:27:18 UTC 
Nevermind, I found it in openembedded-core master.
Comment 7 Nick Clark 2017-12-21 17:32:30 UTC 
Thanks, Richard! You rock.
Comment 8 Sergio Paracuellos 2019-01-08 13:15:53 UTC 
I have a similar issue in 'sumo' branch. The patch you are pointing here is not enough to solve the issue. I have to apply the following patch to be able to find libbacktrace headers: 

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
 
 gfor_io_src = io/size_from_kind.c $(am__append_2)
 gfor_io_headers = \




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?
Comment 9 Sergio Paracuellos 2019-01-10 13:49:07 UTC 
The problem was using a bbappend file for recipes-devtools/gcc/gcc-runtime_7.3.bbappend with:

RUNTIMETARGET += "libgfortran" 

It seems that in 'sumo' libgfortran is a separate recipe so avoiding this bbappend file fortran compiles properly as it is.

Sorry for the noise.