From 07b1af0362beaaf221cbee7b17bbe0a5606fd87d Mon Sep 17 00:00:00 2001
From: Moritz Angermann <moritz.angermann@gmail.com>
Date: Sun, 7 Mar 2021 08:04:00 +0800
Subject: [ci/nix-shell] uniquify NIX_LDFLAGS{_FOR_TARGET}

---
 .gitlab/shell.nix | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/.gitlab/shell.nix b/.gitlab/shell.nix
index 785d16300f..3fcc2f928b 100644
--- a/.gitlab/shell.nix
+++ b/.gitlab/shell.nix
@@ -14,7 +14,17 @@
   # the real fix is to teach terminfo to use libcurses on macOS.
   CONFIGURE_ARGS = "--with-intree-gmp --with-curses-libraries=${pkgs.ncurses.out}/lib";
 
-  buildInputs = (with pkgs; [
+  # magic speedup pony :facepalm:
+  #
+  # nix has the ugly habbit of duplicating ld flags more than necessary.  This
+  # somewhat consolidates this.
+  shellHook = ''
+  export NIX_LDFLAGS=$(for a in $NIX_LDFLAGS; do echo $a; done |sort|uniq|xargs)
+  export NIX_LDFLAGS_FOR_TARGET=$(for a in $NIX_LDFLAGS_FOR_TARGET; do echo $a; done |sort|uniq|xargs)
+  export NIX_LDFLAGS_FOR_TARGET=$(comm -3 <(for l in $NIX_LDFLAGS_FOR_TARGET; do echo $l; done) <(for l in $NIX_LDFLAGS; do echo $l; done))
+  '';
+
+  nativeBuildInputs = (with pkgs; [
     haskell.compiler.${compiler}
     haskell.packages.${compiler}.cabal-install
     haskell.packages.${compiler}.alex
-- 
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