[SeaBIOS] Issues building SeaBIOS with gcc > 4.8

[Idwer Vollering]

2016-07-05 15:49 GMT+02:00 Roger Pau Monné <roger.pau at citrix.com>:
> Hello,
>
> I'm seeing the following issue when building SeaBIOS with gcc > 4.8:
>

(..)

>
> This works fine when using gcc 4.8, but fails in the same way with gcc 5.4.
> The assembler version used is:
>
> GNU assembler version 2.25.1 (x86_64-portbld-freebsd11.0) using BFD version (GNU Binutils) 2.25.1
>
> What causes this issue seems to be the usage of the "-m16" gcc flag, which
> was introduced in gcc 4.9 AFAICT. The following workaround solves the issue,
> but I would like to know if anyone else has seen this with newer gcc
> versions, or if the gcc version from FreeBSD ports is broken.

Are you experiencing issues on hardware too? As in: coreboot.rom for
the mainboard asus/f2a85-m built on FreeBSD 11.0-ALPHA5 r302302,
without gcc installed from 'pkg', with the coreboot crossgcc toolchain
 will not boot.

>
> Thanks, Roger.
>
> ---
> diff --git a/Makefile b/Makefile
> index 4930b3a..19a1e7d 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -73,8 +73,7 @@ CFLAGSSEG := $(COMMONCFLAGS) -DMODESEGMENT=1
> -fno-defer-pop \
>      $(call cc-option,$(CC),-fno-jump-tables,-DMANUAL_NO_JUMP_TABLE) \
>      $(call cc-option,$(CC),-fno-tree-switch-conversion,)
>  CFLAGS32SEG := $(CFLAGSSEG) -DMODE16=0
> -CFLAGS16 := $(CFLAGSSEG) -DMODE16=1 \
> -    $(call cc-option,$(CC),-m16,-Wa$(COMMA)src/code16gcc.s) \
> +CFLAGS16 := $(CFLAGSSEG) -DMODE16=1 -Wa$(COMMA)src/code16gcc.s \
>      $(call cc-option,$(CC),--param large-stack-frame=4,-fno-inline)
>
>  # Run with "make V=1" to see the actual compile commands
>
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