From bdaeae3fbacde765d0187d697364f5b7ebbb04ac Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sat, 10 Feb 2024 20:39:46 +0000
Subject: [PATCH] p4c: fix `gcc-13` build failure

Without the change build fails on `master` as
https://hydra.nixos.org/build/247605854:

    In file included from /build/source/lib/hex.cpp:17:
    /build/source/lib/hex.h:25:5: error: 'intmax_t' does not name a type; did you mean 'int8_t'?
       25 |     intmax_t val;
          |     ^~~~~~~~
          |     int8_t
---
 pkgs/development/compilers/p4c/default.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/pkgs/development/compilers/p4c/default.nix b/pkgs/development/compilers/p4c/default.nix
index 99ec78c6ecee..54d2875d1bc3 100644
--- a/pkgs/development/compilers/p4c/default.nix
+++ b/pkgs/development/compilers/p4c/default.nix
@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchFromGitHub
+, fetchpatch
 , cmake
 , boehmgc
 , bison
@@ -37,6 +38,16 @@ stdenv.mkDerivation (finalAttrs: {
     fetchSubmodules = true;
   };
 
+  patches = [
+    # Fix gcc-13 build:
+    #   https://github.com/p4lang/p4c/pull/4084
+    (fetchpatch {
+      name = "gcc-13.patch";
+      url = "https://github.com/p4lang/p4c/commit/6756816100b7c51e3bf717ec55114a8e8575ba1d.patch";
+      hash = "sha256-wWM1qjgQCNMPdrhQF38jzFgODUsAcaHTajdbV7L3y8o=";
+    })
+  ];
+
   postFetch = ''
     rm -rf backends/ebpf/runtime/contrib/libbpf
     rm -rf control-plane/p4runtime