Re: [OE-core] [PATCH] Fix rust-native build issue when debug is enabled

[Randy MacLeod <randy.macleod@windriver.com>]

On 2021-09-29 9:20 a.m., Pgowda wrote:
> When DEBUG_BUILD is set for building rust-native, it generated
> error as follows:-
> =========================================================
> Building : rustdoc, rustdoc-json-types
> error[E0463]: can't find crate for `rustc_llvm`
> which `rustc_driver` depends on
>    --> src/librustdoc/lib.rs:37:1
>     |
> 37 | extern crate rustc_driver;
>     | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
> =========================================================
> On analyzing the issue, it was found that rustc_llvm crate was present
> at required path. However, it was very huge due to the presence of
> debugging information. Hence, it was somehow not recognized as a valid
> crate. 

So we need to know more about this. What tool is being used to identify
the crate and has there been any changes to fix is since 1.54?

Also, please check this problem still happens with Alex's 1.55 upgrade:
 
http://git.yoctoproject.org/cgit/cgit.cgi/poky-contrib/log/?h=akanavin/package-version-updates



> The following patch removes the debug information from
> rust-llvm-native which is built prior to rust-native but retains debug
> information as required in rust-native binaries.

This is a functional work-around but I suspect that we'll hold-off
for a while before giving in and accepting it in oe-core/master.
Some people might find it useful so thanks for posting it as I suggested.

Hopefully we can better understand and fix the root cause.

Thanks Naveen,

../Randy

> 
> Signed-off-by: Pgowda <pgowda.cve@gmail.com>
> ---
>   meta/recipes-devtools/rust/rust-llvm.inc | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/meta/recipes-devtools/rust/rust-llvm.inc b/meta/recipes-devtools/rust/rust-llvm.inc
> index d7f445385b..0f8fb785b7 100644
> --- a/meta/recipes-devtools/rust/rust-llvm.inc
> +++ b/meta/recipes-devtools/rust/rust-llvm.inc
> @@ -15,6 +15,11 @@ DEPENDS += "ninja-native rust-llvm-native"
>   ARM_INSTRUCTION_SET:armv5 = "arm"
>   ARM_INSTRUCTION_SET:armv4t = "arm"
>   
> +# rustc_llvm with debug info is not recognized as a valid crate that's
> +# generated by rust-llvm-native.
> +CFLAGS:remove = "-g"
> +CXXFLAGS:remove = "-g"
> +
>   LLVM_DIR = "llvm${LLVM_RELEASE}"
>   
>   EXTRA_OECMAKE = " \
> 
> 
> 
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-- 
# Randy MacLeod
# Wind River Linux