Public bug reported:

oss4 autopkgtest fails when building the dkms module:

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/armhf/o/oss4/20200409_153053_073f6@/log.gz
 :
...
Building initial module for 5.4.0-21-generic
Error! Bad return status for module build on kernel: 5.4.0-21-generic (armv7l)
Consult /var/lib/dkms/oss4/4.2-build2010/build/make.log for more information.
dpkg: error processing package oss4-dkms (--configure):
 installed oss4-dkms package post-installation script subprocess returned error 
exit status 10
...

Apparently it is caused by kernel Makefiles setting hard and soft float
on the same gcc line (soft is wrong for armhf):

# cat /var/lib/dkms/oss4/4.2-build2010/build/make.log
DKMS make.log for oss4-4.2-build2010 for kernel 5.4.0-21-generic (armv8l)
Thu Apr  9 17:01:04 UTC 2020
make: Entering directory '/usr/src/linux-headers-5.4.0-21-generic'
  CC [M]  /var/lib/dkms/oss4/4.2-build2010/build/core/oss_core.o
gcc: error: -mfloat-abi=soft and -mfloat-abi=hard may not be used together
make[1]: *** [scripts/Makefile.build:275: 
/var/lib/dkms/oss4/4.2-build2010/build/core/oss_core.o] Error 1
make: *** [Makefile:1719: /var/lib/dkms/oss4/4.2-build2010/build/core] Error 2
make: Leaving directory '/usr/src/linux-headers-5.4.0-21-generic'

The source of the wrong flag seems to be:
$ grep soft /usr/src/linux-headers-5.4.0-21/arch/arm/Makefile
KBUILD_CFLAGS   +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call 
cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float 
-Uarm
...

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: oss4 (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1871887

Title:
  oss4-dkms fails to install on armhf

Status in linux package in Ubuntu:
  New
Status in oss4 package in Ubuntu:
  New

Bug description:
  oss4 autopkgtest fails when building the dkms module:

  
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/armhf/o/oss4/20200409_153053_073f6@/log.gz
 :
  ...
  Building initial module for 5.4.0-21-generic
  Error! Bad return status for module build on kernel: 5.4.0-21-generic (armv7l)
  Consult /var/lib/dkms/oss4/4.2-build2010/build/make.log for more information.
  dpkg: error processing package oss4-dkms (--configure):
   installed oss4-dkms package post-installation script subprocess returned 
error exit status 10
  ...

  Apparently it is caused by kernel Makefiles setting hard and soft
  float on the same gcc line (soft is wrong for armhf):

  # cat /var/lib/dkms/oss4/4.2-build2010/build/make.log
  DKMS make.log for oss4-4.2-build2010 for kernel 5.4.0-21-generic (armv8l)
  Thu Apr  9 17:01:04 UTC 2020
  make: Entering directory '/usr/src/linux-headers-5.4.0-21-generic'
    CC [M]  /var/lib/dkms/oss4/4.2-build2010/build/core/oss_core.o
  gcc: error: -mfloat-abi=soft and -mfloat-abi=hard may not be used together
  make[1]: *** [scripts/Makefile.build:275: 
/var/lib/dkms/oss4/4.2-build2010/build/core/oss_core.o] Error 1
  make: *** [Makefile:1719: /var/lib/dkms/oss4/4.2-build2010/build/core] Error 2
  make: Leaving directory '/usr/src/linux-headers-5.4.0-21-generic'

  The source of the wrong flag seems to be:
  $ grep soft /usr/src/linux-headers-5.4.0-21/arch/arm/Makefile
  KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call 
cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float 
-Uarm
  ...

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