[Buildroot] [PATCH 1/5] package/bdwgc: Fix 'undefined reference to __data_start' linker error on RISC-V

[Yann E. MORIN <yann.morin.1998@free.fr>]

Romain, All,

On 2021-05-02 23:49 +0200, Romain Naour spake thusly:
> Backport an upstream patch fixing a link issue with libgc.so on RISC-V
> 
> riscv64-buildroot-linux-musl/sysroot/usr/lib/libgc.so: undefined reference to `__data_start'
> 
> https://gitlab.com/kubu93/buildroot/-/jobs/1229888983
> 
> Signed-off-by: Romain Naour <romain.naour@gmail.com>

I considered applying for master, but that depends on libatomic-ops
support on riscv, which is arguably a new feature, so does not belong to
master.

Applied to next, thanks.

Regards,
Yann E. MORIN.

> ---
>  ...ference-to-__data_start-linker-error.patch | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 package/bdwgc/0001-Fix-undefined-reference-to-__data_start-linker-error.patch
> 
> diff --git a/package/bdwgc/0001-Fix-undefined-reference-to-__data_start-linker-error.patch b/package/bdwgc/0001-Fix-undefined-reference-to-__data_start-linker-error.patch
> new file mode 100644
> index 0000000000..81221c9f66
> --- /dev/null
> +++ b/package/bdwgc/0001-Fix-undefined-reference-to-__data_start-linker-error.patch
> @@ -0,0 +1,33 @@
> +From 301ef15aefa6764466c374d07efb511b1c3862cc Mon Sep 17 00:00:00 2001
> +From: Nikita Ermakov <coffe92@gmail.com>
> +Date: Wed, 20 May 2020 17:57:17 +0300
> +Subject: [PATCH] Fix 'undefined reference to __data_start' linker error on
> + RISC-V
> +
> +Issue #294 (bdwgc).
> +
> +* include/private/gcconfig.h [RISCV && LINUX] (__data_start): Add
> +attribute(weak).
> +
> +(cherry picked from commit 538562ad01b181f4cc3913da1ac06a77945cd9b9)
> +Signed-off-by: Romain Naour <romain.naour@gmail.com>
> +---
> + include/private/gcconfig.h | 2 +-
> + 1 file changed, 1 insertion(+), 1 deletion(-)
> +
> +diff --git a/include/private/gcconfig.h b/include/private/gcconfig.h
> +index d9d45da1..d6cefa6f 100644
> +--- a/include/private/gcconfig.h
> ++++ b/include/private/gcconfig.h
> +@@ -2943,7 +2943,7 @@ EXTERN_C_BEGIN
> + #   define ALIGNMENT (CPP_WORDSZ/8)
> + #   ifdef LINUX
> + #     define OS_TYPE "LINUX"
> +-      extern int __data_start[];
> ++      extern int __data_start[] __attribute__((__weak__));
> + #     define DATASTART ((ptr_t)__data_start)
> + #     define LINUX_STACKBOTTOM
> + #     define DYNAMIC_LOADING
> +-- 
> +2.30.2
> +
> -- 
> 2.30.2
> 
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