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-rw-r--r--pkgs/development/compilers/llvm/3.5/llvm.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/pkgs/development/compilers/llvm/3.5/llvm.nix b/pkgs/development/compilers/llvm/3.5/llvm.nix
index 395843bf0d8f..8daba7b1d9cd 100644
--- a/pkgs/development/compilers/llvm/3.5/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.5/llvm.nix
@@ -12,6 +12,7 @@
 , version
 , zlib
 , compiler-rt_src
+, debugVersion ? false
 }:
 
 let
@@ -38,7 +39,7 @@ in stdenv.mkDerivation rec {
   '';
 
   cmakeFlags = with stdenv; [
-    "-DCMAKE_BUILD_TYPE=Release"
+    "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_BUILD_TESTS=ON"
     "-DLLVM_ENABLE_FFI=ON"
     "-DLLVM_REQUIRES_RTTI=1"