From b3282b301096253a11b1f887f915d0a2a2183597 Mon Sep 17 00:00:00 2001
From: Frank de Brabander <debrabander@gmail.com>
Date: Thu, 8 Aug 2024 08:04:48 +0200
Subject: [PATCH] Dont embed RUSTFLAGS in final binary

Upstream-Status: Backport [https://github.com/pydantic/pydantic-core/commit/e07c41b3bad75948201a2201387225694c2fb501]
---
 build.rs   | 9 +++++++++
 src/lib.rs | 5 ++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/build.rs b/build.rs
index 7f59e1f..7fe6490 100644
--- a/build.rs
+++ b/build.rs
@@ -35,6 +35,15 @@ fn main() {
     if let Some(true) = version_check::supports_feature("coverage_attribute") {
         println!("cargo:rustc-cfg=has_coverage_attribute");
     }
+
+    if std::env::var("RUSTFLAGS")
+        .unwrap_or_default()
+        .contains("-Cprofile-use=")
+    {
+        println!("cargo:rustc-cfg=specified_profile_use");
+    }
+    println!("cargo:rustc-check-cfg=cfg(specified_profile_use)");
+
     generate_self_schema();
     println!("cargo:rustc-env=PROFILE={}", std::env::var("PROFILE").unwrap());
 }
diff --git a/src/lib.rs b/src/lib.rs
index d55e836..206a7a1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -111,7 +111,10 @@ pub fn build_info() -> String {
     format!(
         "profile={} pgo={}",
         env!("PROFILE"),
-        option_env!("RUSTFLAGS").unwrap_or("").contains("-Cprofile-use="),
+        // We use a `cfg!` here not `env!`/`option_env!` as those would
+        // embed `RUSTFLAGS` into the generated binary which causes problems
+        // with reproducable builds.
+        cfg!(specified_profile_use),
     )
 }