llvm-packages: add option to enable manpages

pkgs/development/compilers/llvm/4/clang/default.nix

@@ -1,5 +1,6 @@
 { stdenv, fetch, cmake, libxml2, libedit, llvm, version, release_version, clang-tools-extra_src, python
 , fixDarwinDylibNames
+, enableManpages ? true
 }:
 
 let
@@ -15,21 +16,24 @@ let
       mv clang-tools-extra-* $sourceRoot/tools/extra
     '';
 
-    nativeBuildInputs = [ cmake python python.pkgs.sphinx ];
+    nativeBuildInputs = [ cmake python ]
+      ++ stdenv.lib.optional enableManpages python.pkgs.sphinx;
+
     buildInputs = [ libedit libxml2 llvm ]
       ++ stdenv.lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++11"
+    ] ++ stdenv.lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++
+    ]
     # Maybe with compiler-rt this won't be needed?
-    (stdenv.lib.optional stdenv.isLinux "-DGCC_INSTALL_PREFIX=${gcc}") ++
+    ++ stdenv.lib.optional stdenv.isLinux "-DGCC_INSTALL_PREFIX=${gcc}"
-    (stdenv.lib.optional (stdenv.cc.libc != null) "-DC_INCLUDE_DIRS=${stdenv.cc.libc}/include");
+    ++ stdenv.lib.optional (stdenv.cc.libc != null) "-DC_INCLUDE_DIRS=${stdenv.cc.libc}/include";
 
     patches = [ ./purity.patch ];
 
@@ -45,7 +49,7 @@ let
       sed -i '1s,^,find_package(Sphinx REQUIRED)\n,' docs/CMakeLists.txt
     '';
 
-    outputs = [ "out" "man" "python" ];
+    outputs = [ "out" ] ++ stdenv.lib.optional enableManpages "man" ++ [ "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     # Clang expects to find sanitizer libraries in its own prefix
@@ -62,6 +66,8 @@ let
       mv $out/share/clang/*.py $python/share/clang
 
       rm $out/bin/c-index-test
+    ''
+    + stdenv.lib.optionalString enableManpages ''
 
       # Manually install clang manpage
       cp docs/man/*.1 $out/share/man/man1/

pkgs/development/compilers/llvm/4/llvm.nix

@@ -16,6 +16,7 @@
 , compiler-rt_src
 , libcxxabi
 , debugVersion ? false
+, enableManpages ? true
 , enableSharedLibraries ? true
 , darwin
 }:
@@ -38,9 +39,13 @@ in stdenv.mkDerivation rec {
     mv compiler-rt-* $sourceRoot/projects/compiler-rt
   '';
 
-  outputs = [ "out" "man" ] ++ stdenv.lib.optional enableSharedLibraries "lib";
+  outputs = [ "out" ]
+    ++ stdenv.lib.optional enableManpages "man"
+    ++ stdenv.lib.optional enableSharedLibraries "lib";
+
+  nativeBuildInputs = [ perl groff cmake python ]
+    ++ stdenv.lib.optional enableManpages python.pkgs.sphinx;
 
-  nativeBuildInputs = [ perl groff cmake python python.pkgs.sphinx ];
   buildInputs = [ libxml2 libffi ]
     ++ stdenv.lib.optionals stdenv.isDarwin [ libcxxabi ];
 
@@ -81,6 +86,7 @@ in stdenv.mkDerivation rec {
     "-DLLVM_ENABLE_FFI=ON"
     "-DLLVM_ENABLE_RTTI=ON"
     "-DCOMPILER_RT_INCLUDE_TESTS=OFF" # FIXME: requires clang source code
+  ] ++ stdenv.lib.optionals enableManpages [
     "-DLLVM_BUILD_DOCS=ON"
     "-DLLVM_ENABLE_SPHINX=ON"
     "-DSPHINX_OUTPUT_MAN=ON"
@@ -109,10 +115,10 @@ in stdenv.mkDerivation rec {
     export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD/lib
   '';
 
-  postInstall = ''
+  postInstall = stdenv.lib.optionalString enableManpages ''
     moveToOutput "share/man" "$man"
   ''
-  + stdenv.lib.optionalString (enableSharedLibraries) ''
+  + stdenv.lib.optionalString enableSharedLibraries ''
     moveToOutput "lib/libLLVM-*" "$lib"
     moveToOutput "lib/libLLVM.${shlib}" "$lib"
     substituteInPlace "$out/lib/cmake/llvm/LLVMExports-release.cmake" \