rust197: add an explicit test for "new enough LLVM" to options.mk.

[Havard Eidnes (via pkgsrc-wip) <commit-notify%pkgsrc.org@localhost>]

Module Name:	pkgsrc-wip
Committed By:	Havard Eidnes <he%NetBSD.org@localhost>
Pushed By:	he
Date:		Sun Jul 26 09:53:22 2026 +0000
Changeset:	4bcc402b99845ac604cc48b49ccd05a01a99503a

Modified Files:
	rust197/options.mk

Log Message:
rust197: add an explicit test for "new enough LLVM" to options.mk.

This is so that an attempt at building with an older already-installed
llvm will fail much earlier than long into the rustc build.  Leave a
comment where to look for the LLVM requirement in the code.

To see a diff of this commit:
https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=4bcc402b99845ac604cc48b49ccd05a01a99503a

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

diffstat:
 rust197/options.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diffs:
diff --git a/rust197/options.mk b/rust197/options.mk
index ffdaf7b19a..b3e38878cf 100644
--- a/rust197/options.mk
+++ b/rust197/options.mk
@@ -66,6 +66,12 @@ GCC_REQD+=	14
 #
 .if empty(PKG_OPTIONS:Mrust-internal-llvm)
 .include "../../lang/libunwind/buildlink3.mk"
+
+# Ref. src/bootstrap/src/core/build_steps/llvm.rs / check_llvm_version()
+# rust now (1.97.0) requires LLVM >= 21.x
+BUILDLINK_API_DEPENDS.llvm+=    llvm>=21.1.0
+BUILDLINK_ABI_DEPENDS.llvm+=    llvm>=21.1.0
+
 .include "../../lang/llvm/buildlink3.mk"
 CONFIGURE_ARGS+=	--enable-llvm-link-shared
 CONFIGURE_ARGS+=	--llvm-libunwind=system