[Buildroot] [PATCH RESEND] toolchain: use -ffp-contract=off on MIPS in the wrapper when needed
Baruch Siach
baruch at tkos.co.il
Thu Mar 8 12:33:36 UTC 2018
Hi Ezequiel,
On Thu, Mar 08, 2018 at 09:14:30AM -0300, Ezequiel Garcia wrote:
> From: Johannes Schmitz <johannes.schmitz1 at gmail.com>
>
> This fix is necessary for to build for MIPS, for example for the MIPS
> XBurst architecture used on ci20 boards.
>
> GCC has replaced (no)mfused-madd with ffp-contract.
> Find more details and a long discussion at
> https://gcc.gnu.org/ml/gcc-patches/2015-06/msg00876.html
>
> Signed-off-by: Johannes Schmitz <johannes.schmitz1 at gmail.com>
> Tested-by: Ezequiel Garcia <ezequiel at vanguardiasur.com.ar>
> ---
> Ci20 builds are currently broken without this patch.
>
> toolchain/toolchain-wrapper.c | 3 ---
> toolchain/toolchain-wrapper.mk | 4 ++++
> 2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/toolchain/toolchain-wrapper.c b/toolchain/toolchain-wrapper.c
> index 2928ea42d0e6..04b263199547 100644
> --- a/toolchain/toolchain-wrapper.c
> +++ b/toolchain/toolchain-wrapper.c
> @@ -79,9 +79,6 @@ static char *predef_args[] = {
> #ifdef BR_OMIT_LOCK_PREFIX
> "-Wa,-momit-lock-prefix=yes",
> #endif
> -#ifdef BR_NO_FUSED_MADD
Since you remove this macro reference, ...
> - "-mno-fused-madd",
> -#endif
> #ifdef BR_BINFMT_FLAT
> "-Wl,-elf2flt",
> #endif
> diff --git a/toolchain/toolchain-wrapper.mk b/toolchain/toolchain-wrapper.mk
> index 7f72a0cadec9..7faa033f605c 100644
> --- a/toolchain/toolchain-wrapper.mk
> +++ b/toolchain/toolchain-wrapper.mk
> @@ -28,8 +28,12 @@ endif
>
> # Avoid FPU bug on XBurst CPUs
> ifeq ($(BR2_mips_xburst),y)
> +ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_6),y)
> +TOOLCHAIN_WRAPPER_ARGS += -DBR_FP_CONTRACT_OFF
> +else
> TOOLCHAIN_WRAPPER_ARGS += -DBR_NO_FUSED_MADD
... why not remove it here as well?
> endif
> +endif
>
> ifeq ($(BR2_CCACHE_USE_BASEDIR),y)
> TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE_BASEDIR='"$(BASE_DIR)"'
baruch
--
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