From 7c3ea677f2d0fd6830c56eff67d2fbad776fae9a Mon Sep 17 00:00:00 2001
From: Mikhail Glushenkov <the.dead.shall.rise@gmail.com>
Date: Thu, 21 Mar 2013 00:48:14 +0100
Subject: [PATCH] Make it possible to build empty libraries again.

Restores old behaviour broken by @igfoo in
8395c5db800284c9e2b54b5c45b94c4a3bfdfcf2. Fixes #1241.
---
 Cabal/Distribution/Simple/Register.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Cabal/Distribution/Simple/Register.hs b/Cabal/Distribution/Simple/Register.hs
index f9b59aa22c8..87c67052f96 100644
--- a/Cabal/Distribution/Simple/Register.hs
+++ b/Cabal/Distribution/Simple/Register.hs
@@ -295,7 +295,8 @@ generalInstalledPackageInfo adjustRelIncDirs pkg lib clbi installDirs =
                                then libdir installDirs : extraLibDirs bi
                                else                      extraLibDirs bi,
     IPI.hsLibraries        = [ libname
-                             | LibraryName libname <- componentLibraries clbi ],
+                             | LibraryName libname <- componentLibraries clbi
+                             , hasLibrary ],
     IPI.extraLibraries     = extraLibs bi,
     IPI.extraGHCiLibraries = [],
     IPI.includeDirs        = absinc ++ adjustRelIncDirs relinc,