From 1c2dfb8de915aa9fbabed038e30afbb2d6c9ed74 Mon Sep 17 00:00:00 2001
From: Emily <vcs@emily.moe>
Date: Fri, 20 Jun 2025 11:22:11 +0100
Subject: [PATCH] gcc: use `sanitiseHeaderPathsHook`

This reduces the WebKitGTK runtime closure size from 1.45 GiB to
1.22 GiB on `aarch64-linux`, as measured by `nix-tree`.
---
 pkgs/development/compilers/gcc/common/dependencies.nix | 5 +++++
 pkgs/development/compilers/gcc/default.nix             | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/pkgs/development/compilers/gcc/common/dependencies.nix b/pkgs/development/compilers/gcc/common/dependencies.nix
index ee62f1da0e1f..38cbcc2682b1 100644
--- a/pkgs/development/compilers/gcc/common/dependencies.nix
+++ b/pkgs/development/compilers/gcc/common/dependencies.nix
@@ -12,6 +12,7 @@
   gmp,
   mpfr,
   libmpc,
+  sanitiseHeaderPathsHook,
   libucontext ? null,
   libxcrypt ? null,
   isSnapshot ? false,
@@ -42,6 +43,10 @@ in
       texinfo
       which
       gettext
+
+      # Prevent GCC leaking into the runtime closure of C++ packages
+      # through headers using `__FILE__`.
+      sanitiseHeaderPathsHook
     ]
     ++ optionals (perl != null) [ perl ]
     ++ optionals (with stdenv.targetPlatform; isVc4 || isRedox || isSnapshot && flex != null) [ flex ]
diff --git a/pkgs/development/compilers/gcc/default.nix b/pkgs/development/compilers/gcc/default.nix
index 1cd81dc4f669..a3d54f1b8525 100644
--- a/pkgs/development/compilers/gcc/default.nix
+++ b/pkgs/development/compilers/gcc/default.nix
@@ -49,6 +49,7 @@
     !enablePlugin
     || (stdenv.targetPlatform.isAvr && stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64),
   nukeReferences,
+  sanitiseHeaderPathsHook,
   callPackage,
   majorMinorVersion,
   apple-sdk,
@@ -179,6 +180,7 @@ let
       pkgsBuildTarget
       profiledCompiler
       reproducibleBuild
+      sanitiseHeaderPathsHook
       staticCompiler
       stdenv
       targetPackages