From f42aa7e1d7ac4fb1050b73b296912fa7c7b927c2 Mon Sep 17 00:00:00 2001
From: Matthew Bauer <mjbauer95@gmail.com>
Date: Mon, 6 Jul 2020 00:22:19 -0400
Subject: [PATCH] cc-wrapper: set FC when langFortran is on
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We need to set FC so that CMake and other tools can find the fortran
compiler. Also we need to limit the hardening flags since fortify and
format don’t work with fortran.

Fixes #88449
---
 pkgs/build-support/cc-wrapper/default.nix     |  5 +++--
 pkgs/build-support/cc-wrapper/fortran-hook.sh | 11 +++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)
 create mode 100644 pkgs/build-support/cc-wrapper/fortran-hook.sh

diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index da16a23f9df..b79aac37a33 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -214,6 +214,7 @@ stdenv.mkDerivation {
       wrap ${targetPrefix}gfortran $wrapper $ccPath/${targetPrefix}gfortran
       ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}g77
       ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}f77
+      export named_fc=${targetPrefix}gfortran
     ''
 
     + optionalString cc.langJava or false ''
@@ -232,8 +233,8 @@ stdenv.mkDerivation {
 
   setupHooks = [
     ../setup-hooks/role.bash
-    ./setup-hook.sh
-  ];
+  ] ++ stdenv.lib.optional (cc.langC or true) ./setup-hook.sh
+    ++ stdenv.lib.optional (cc.langFortran or false) ./fortran-hook.sh;
 
   postFixup =
     ''
diff --git a/pkgs/build-support/cc-wrapper/fortran-hook.sh b/pkgs/build-support/cc-wrapper/fortran-hook.sh
new file mode 100644
index 00000000000..d72f314c01c
--- /dev/null
+++ b/pkgs/build-support/cc-wrapper/fortran-hook.sh
@@ -0,0 +1,11 @@
+getTargetRole
+getTargetRoleWrapper
+
+export FC${role_post}=@named_fc@
+
+# If unset, assume the default hardening flags.
+# These are different for fortran.
+: ${NIX_HARDENING_ENABLE="stackprotector pic strictoverflow relro bindnow"}
+export NIX_HARDENING_ENABLE
+
+unset -v role_post