[Buildroot] [PATCH v2] package/libnss: fix build failure due to HW PPC Crypto bug

[Yann E. MORIN]

Giulio, All,

On 2020-01-01 17:58 +0100, Giulio Benetti spake thusly:
> libnss expects OS_TEST to be set to ppc or ppc64 or ppc64le instead of
> powerpc, powerpc64, powerpc64le. At the moment gcm.h header checks if
> __powerpc64__ is defined, but Makefile expects OS_TEST to be set to
> ppc64 or ppc64le to build gcm-ppc.c. This way we end with having gcm
> prototypes defined, but without implementation compiled. So remap
> OS_TEST to what libnss expects depending on BR2_powerpc* enabled. This
> way Makefile will build gcm-ppc.c too, that contains gcm-ppc function
> implementations using Altivec. But add also a patch that modify
> minimum gcc version required for using Altivec functions from 5.x to 8.x
> since some Altivec intrinsics have been instroduced only in 8.x(i.e.
> vec_xst_be()).
> 
> Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>

Applied to master, after doing a few tweaks:

  - move the arch setting to kconfig (like recently done in e3159cad71)
  - add the build failure
  - add pointer to upstream bug report and patch sybmission
  - reformat and reword commit log

Pushed now, thanks.

Regards,
Yann E. MORIN.

> ---
> V1 -> V2:
> * changed completely approach
> Pending upstream:
> https://bugzilla.mozilla.org/show_bug.cgi?id=1606119
> ---
>  ...6119-Fix-PPC-HW-Crypto-build-failure.patch | 35 +++++++++++++++++++
>  package/libnss/libnss.mk                      |  6 ++++
>  2 files changed, 41 insertions(+)
>  create mode 100644 package/libnss/0005-Bug-1606119-Fix-PPC-HW-Crypto-build-failure.patch
> 
> diff --git a/package/libnss/0005-Bug-1606119-Fix-PPC-HW-Crypto-build-failure.patch b/package/libnss/0005-Bug-1606119-Fix-PPC-HW-Crypto-build-failure.patch
> new file mode 100644
> index 0000000000..2439eb1625
> --- /dev/null
> +++ b/package/libnss/0005-Bug-1606119-Fix-PPC-HW-Crypto-build-failure.patch
> @@ -0,0 +1,35 @@
> +From ebf185f8e48b5aec622dc949cef1b19b0a7669ef Mon Sep 17 00:00:00 2001
> +From: Giulio Benetti <giulio.benetti at benettiengineering.com>
> +Date: Wed, 1 Jan 2020 12:54:45 +0100
> +Subject: [PATCH] Bug 1606119 - Fix PPC HW Crypto build failure
> +
> +All Altivec *_be() functions are supported from gcc version 8.x not 5.x
> +so modify gcc version check that at the moment cause build failure due
> +to missing Altivec *_be() functions.
> +
> +Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
> +---
> + nss/lib/freebl/gcm.h | 4 ++--
> + 1 file changed, 2 insertions(+), 2 deletions(-)
> +
> +diff --git a/nss/lib/freebl/gcm.h b/nss/lib/freebl/gcm.h
> +index 571b9ec55..aa4dee824 100644
> +--- a/nss/lib/freebl/gcm.h
> ++++ b/nss/lib/freebl/gcm.h
> +@@ -41,11 +41,11 @@
> + #endif
> + 
> + /*
> +- * PPC CRYPTO requires at least gcc 5 or clang. The LE check is purely
> ++ * PPC CRYPTO requires at least gcc 8 or clang. The LE check is purely
> +  * because it's only been tested on LE. If you're interested in BE,
> +  * please send a patch.
> +  */
> +-#if (defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 5)) && \
> ++#if (defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 8)) && \
> +     defined(IS_LITTLE_ENDIAN)
> + #define USE_PPC_CRYPTO
> + #endif
> +-- 
> +2.20.1
> +
> diff --git a/package/libnss/libnss.mk b/package/libnss/libnss.mk
> index 9349276a90..23dfdb11e4 100644
> --- a/package/libnss/libnss.mk
> +++ b/package/libnss/libnss.mk
> @@ -39,6 +39,12 @@ endif
>  
>  ifeq ($(BR2_aarch64_be),y)
>  LIBNSS_ARCH = aarch64
> +else ifeq ($(BR2_powerpc),y)
> +LIBNSS_ARCH = ppc
> +else ifeq ($(BR2_powerpc64),y)
> +LIBNSS_ARCH = ppc64
> +else ifeq ($(BR2_powerpc64le),y)
> +LIBNSS_ARCH = ppc64le
>  else
>  LIBNSS_ARCH = $(ARCH)
>  endif
> -- 
> 2.20.1
> 
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