Re: [Buildroot] S390 Buildroot/gcc build issue

Hello,

On Wed, Aug 12, 2026 at 11:11:10AM +0200, Alexander Egorenkov wrote:

> the types _Decimal* require for the host compiler to be built with
> --enable-decimal-float.

What do you call the "host compiler" in this context?

Are you talking about the native gcc compiler available on the host,
or the cross-compiler built by Buildroot?

> 
> package/gcc/gcc.mk:
> -------------------
> 
> HOST_GCC_COMMON_CONF_OPTS = \
> 	--target=$(GNU_TARGET_NAME) \
> 	--with-sysroot=$(STAGING_DIR) \
> 	--enable-__cxa_atexit \
> 	--with-gnu-ld \
> 	--disable-libssp \
> 	--disable-multilib \
> 	--disable-decimal-float                 <----- !!!

These are the common options...

> Can we turn --disable-decimal-float into --enable-decimal-float on
> s390x arch ? It fixed the problem for me.
> 
> package/gcc/gcc.mk:
> -------------------
> 
> ifeq ($(BR2_s390x),y)
> HOST_GCC_COMMON_CONF_OPTS += \
> 	--with-long-double-128 \
> 	--enable-decimal-float                 <----- !!!

and for S390, it gets overridden.

See: it's the same variable that gets appended, so at the end we have:

HOST_GCC_COMMON_CONF_OPTS = \
	[...]
	--disable-decimal-float \
	[...]
	--enable-decimal-float

So on S390, the cross-compiler is built with --enable-decimal-float.

Best regards,

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