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package/gcc: enable decimal float on s390

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Floating-point type _Float16 added in gcc-16 on s390 now requires
decimal floating-point support enabled in the toolchain [1][2].

Without decimal floating-point, 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)

Enable decimal floating-point support as suggested by Alexander
Egorenkov.

Fixes:
https://lore.kernel.org/buildroot/ansJ5dXXblvYeMLB@windsurf/

[1] https://gcc.gnu.org/gcc-16/changes.html#s390
[2] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=5d6d56d837c3dbeabd382c1fb4f7d21d9891f4b9

Cc: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>
This commit is contained in:
Romain Naour
2026-08-27 23:21:24 +02:00
committed by Julien Olivain
parent 08cc0938b5
commit 789485b3e7
1 changed files with 9 additions and 1 deletions
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10
package/gcc/gcc.mk
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@@ -70,7 +70,6 @@ HOST_GCC_COMMON_CONF_OPTS = \
--with-gnu-ld \
--disable-libssp \
--disable-multilib \
--disable-decimal-float \
--enable-plugins \
--enable-lto \
--with-gmp=$(HOST_DIR) \
@@ -80,6 +79,15 @@ HOST_GCC_COMMON_CONF_OPTS = \
--with-bugurl="https://gitlab.com/buildroot.org/buildroot/-/issues" \
--without-zstd
# https://gcc.gnu.org/gcc-16/changes.html#s390
# Floating-point type _Float16 added in gcc-16 on s390 now requires
# decimal float support enabled in the toolchain.
ifeq ($(BR2_s390x)$(BR2_TOOLCHAIN_GCC_AT_LEAST_16),yy)
HOST_GCC_COMMON_CONF_OPTS += --enable-decimal-float
else
HOST_GCC_COMMON_CONF_OPTS += --disable-decimal-float
endif
ifeq ($(BR2_REPRODUCIBLE),y)
HOST_GCC_COMMON_CONF_OPTS += --with-debug-prefix-map=$(BASE_DIR)=buildroot
endif