[Buildroot] S390 Buildroot/gcc build issue

* [Buildroot] S390 Buildroot/gcc build issue
@ 2026-08-11 11:42 Thomas Petazzoni via buildroot
  0 siblings, 0 replies; only message in thread
From: Thomas Petazzoni via buildroot @ 2026-08-11 11:42 UTC (permalink / raw)
  To: Alexander Egorenkov; +Cc: buildroot

Alexander,

I am contacting you regarding a build issue I'm seeing with the S390
architecture in Buildroot.

With the following defconfig:

BR2_s390x=y
BR2_KERNEL_HEADERS_6_12=y
BR2_PACKAGE_GLIBC_KERNEL_COMPAT=y
BR2_BINUTILS_VERSION_2_46_X=y
BR2_BINUTILS_GPROFNG=y
BR2_GCC_VERSION_16_X=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_TOOLCHAIN_BUILDROOT_FORTRAN=y
BR2_GCC_ENABLE_OPENMP=y
BR2_PACKAGE_HOST_GDB=y
BR2_PACKAGE_HOST_GDB_TUI=y
BR2_PACKAGE_HOST_GDB_PYTHON3=y
BR2_GDB_VERSION_17=y
BR2_GNU_MIRROR="https://mirrors.kernel.org/gnu/"
BR2_PACKAGE_GDB=y

gcc 16.2.0 fails to build with:

../../../libgcc/config/s390/_dpd_sd_to_hf.c:27:25: error: decimal floating-point not supported for this target
   27 | HFtype __dpd_truncsdhf (_Decimal32);
      |                         ^~~~~~~~~~
../../../libgcc/config/s390/_dpd_sd_to_hf.c:31:16: error: decimal floating-point not supported for this target
   31 | force_convert (_Decimal32 x)
      |                ^~~~~~~~~~
../../../libgcc/config/s390/_dpd_hf_to_td.c:34:1: error: decimal floating-point not supported for this target
   34 | _Decimal128
      | ^~~~~~~~~~~
../../../libgcc/config/s390/_dpd_sd_to_hf.c:35:18: error: decimal floating-point not supported for this target
   35 | __dpd_truncsdhf (_Decimal32 x)
      |                  ^~~~~~~~~~

I haven't checked whether this is new with gcc 16.x or not, and I'm
not familiar with floating point support on S390.

Are you familiar with this issue?

I see the same issue with gcc 16.1.0 in the autobuilders:

  https://autobuild.buildroot.net/results/f88/f88565af0f653df831a7fa43d2507d167fdb9d36/build-end.log

But I don't seem to see any issue with gcc 15.x, so my guess is that
this is a new issue with gcc 16.x.

Any idea?

Thanks a lot!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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