Only build host libgrust if the Rust language is enabled (was: [PATCH v2 3/4] build: Add libgrust as compilation modules)

[Thomas Schwinge <thomas@codesourcery.com>]

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Hi!

On 2023-10-25T23:40:40+0200, I wrote:
> On 2023-10-25T13:06:48+0200, Arthur Cohen <arthur.cohen@embecosm.com> wrote:
>> From: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
>>
>> Define the libgrust directory as a host compilation module as well as
>> for targets.
>
> I don't see a response to Richard's comments:
> <https://inbox.sourceware.org/CAFiYyc0Pcqfbknt06FaMMsNrf7Ww4Kbor6QVeTWj++KmUP1nOw@mail.gmail.com>.
> Re "doesn't build libgrust if [Rust is not enabled]", I suppose (but have
> not checked) this works for the *target* libgrust module via
> 'gcc/rust/config-lang.in:target_libs' requesting 'target-libgrust' only
> if the Rust language is enabled?

That aspect appears to work: testing a GCC configuration without the Rust
language enabled, target libgrust doesn't get built, but...

> I don't know what enables/disables the
> *host* libgrust build?

... indeed, host libgrust still does get built.

The attached "Only build host libgrust if the Rust language is enabled"
ought to address this.


Grüße
 Thomas


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From 403e6bf5349f8a22e4dc7b74ea80acb55e4f5133 Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <thomas@codesourcery.com>
Date: Fri, 27 Oct 2023 11:59:19 +0200
Subject: [PATCH] Only build host libgrust if the Rust language is enabled

	gcc/
	* rust/config-lang.in (lang_dirs): Set to 'libgrust'.
---
 gcc/rust/config-lang.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/rust/config-lang.in b/gcc/rust/config-lang.in
index 8f071dcb0bf0..aee6f0eb468f 100644
--- a/gcc/rust/config-lang.in
+++ b/gcc/rust/config-lang.in
@@ -30,5 +30,6 @@ compilers="rust1\$(exeext)"
 build_by_default="no"
 
 target_libs="target-libffi target-libbacktrace target-libgrust"
+lang_dirs=libgrust
 
 gtfiles="\$(srcdir)/rust/rust-lang.cc"
-- 
2.40.1