From 3d211a0567b8e7ff1910971bdf8edc7da5487cb3 Mon Sep 17 00:00:00 2001
From: Chris Wailes <chriswailes@google.com>
Date: Thu, 11 Jul 2024 11:31:14 -0700
Subject: [PATCH] Pass the `--cfg soong` flag when building rustdoc

This CL modifies Soong to pass the `--cfg soong` flag to the rustdoc
tool.

Test: m rustdoc
Bug: 303116432
Change-Id: I089edebe3c0450b9f9d4f97404bafb7e90ed1f8a
---
 rust/builder.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rust/builder.go b/rust/builder.go
index 1ce92f4ec..f469f56f8 100644
--- a/rust/builder.go
+++ b/rust/builder.go
@@ -520,6 +520,9 @@ func Rustdoc(ctx ModuleContext, main android.Path, deps PathDeps,
 	// this flag.
 	rustdocFlags = append(rustdocFlags, "-Z", "unstable-options", "--enable-index-page")
 
+	// Ensure we use any special-case code-paths for Soong.
+	rustdocFlags = append(rustdocFlags, "--cfg", "soong")
+
 	targetTriple := ctx.toolchain().RustTriple()
 
 	// Collect rustc flags