[Buildroot] [PATCH 1/1] package/capnproto: fix build on riscv32

[Koen Martens <gmc@sonologic.nl>]

Hi,

Thanks for diving into this. I've had emails about this for months, and briefly
looked at it, but never found the time to properly figure it out.

I see the patch below is also present upstream. Do you know whether this has
already been released or when it will be?

Given that this exact patch is also applied upstream, your patch below seems fine
to me.

Cheers,

Koen

On Thu, May 27, 2021 at 11:04:02PM +0200, Fabrice Fontaine wrote:
> Fixes:
>  - http://autobuild.buildroot.org/results/1c1cd4775241ee57d878cad5c978413d4b4a8736
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> ---
>  ...it-architectures-using-64-bit-time_t.patch | 37 +++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 package/capnproto/0001-mutex-Fix-build-on-32-bit-architectures-using-64-bit-time_t.patch
> 
> diff --git a/package/capnproto/0001-mutex-Fix-build-on-32-bit-architectures-using-64-bit-time_t.patch b/package/capnproto/0001-mutex-Fix-build-on-32-bit-architectures-using-64-bit-time_t.patch
> new file mode 100644
> index 0000000000..ce70ab8f29
> --- /dev/null
> +++ b/package/capnproto/0001-mutex-Fix-build-on-32-bit-architectures-using-64-bit-time_t.patch
> @@ -0,0 +1,37 @@
> +From e2a05a19e9dc51287e19cc9f11fd91449219e361 Mon Sep 17 00:00:00 2001
> +From: Khem Raj <raj.khem@gmail.com>
> +Date: Sun, 15 Nov 2020 12:10:28 -0800
> +Subject: [PATCH] mutex: Fix build on 32-bit architectures using 64-bit time_t
> +
> +mutex code uses SYS_futex, which it expects from system C library.
> +in glibc (/usr/include/bits/syscall.h defines it in terms of of NR_futex)
> +rv32 is using 64bit time_t from get go unlike other 32bit architectures
> +in glibc, therefore it wont have NR_futex defined but just NR_futex_time64
> +this aliases it to NR_futex so that SYS_futex is then defined for rv32
> +
> +Signed-off-by: Khem Raj <raj.khem@gmail.com>
> +[Retrieved from:
> +https://github.com/capnproto/capnproto/commit/e2a05a19e9dc51287e19cc9f11fd91449219e361]
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> +---
> + c++/src/kj/mutex.c++ | 6 ++++++
> + 1 file changed, 6 insertions(+)
> +
> +diff --git a/c++/src/kj/mutex.c++ b/c++/src/kj/mutex.c++
> +index c81cead7b..e1594b117 100644
> +--- a/c++/src/kj/mutex.c++
> ++++ b/c++/src/kj/mutex.c++
> +@@ -39,7 +39,13 @@
> + 
> + #ifndef SYS_futex
> + // Missing on Android/Bionic.
> ++#ifdef __NR_futex
> + #define SYS_futex __NR_futex
> ++#elif defined(SYS_futex_time64)
> ++#define SYS_futex SYS_futex_time64
> ++#else
> ++#error "Need working SYS_futex"
> ++#endif
> + #endif
> + 
> + #ifndef FUTEX_WAIT_PRIVATE
> -- 
> 2.30.2
>