From 8d3fc481a4cbd2ec474ff05996b91c76ede3132e Mon Sep 17 00:00:00 2001
From: Jonathan Ringer <jonringer117@gmail.com>
Date: Mon, 11 Jul 2022 17:52:55 -0700
Subject: [PATCH] folly: expose fmt and boost libs

This allows for people consuming these
packages to inherit the same libaries.

This is needed because the folly-config.cmake
will use `find_package` on these dependencies,
thus downstream packages should avoid potential
abi issues.
---
 pkgs/development/libraries/folly/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/development/libraries/folly/default.nix b/pkgs/development/libraries/folly/default.nix
index 69e690011b8ad5f..0ef5dfbc2e570e8 100644
--- a/pkgs/development/libraries/folly/default.nix
+++ b/pkgs/development/libraries/folly/default.nix
@@ -59,6 +59,13 @@ stdenv.mkDerivation rec {
   NIX_CFLAGS_COMPILE = [ "-DFOLLY_MOBILE=${if follyMobile then "1" else "0"}" "-fpermissive" ];
   cmakeFlags = [ "-DBUILD_SHARED_LIBS=ON" ];
 
+  # folly-config.cmake, will `find_package` these, thus there should be
+  # a way to ensure abi compatibility.
+  passthru = {
+    inherit boost;
+    fmt = fmt_8;
+  };
+
   meta = with lib; {
     description = "An open-source C++ library developed and used at Facebook";
     homepage = "https://github.com/facebook/folly";