1 files changed, 11 insertions, 3 deletions
diff --git a/nixpkgs/pkgs/development/interpreters/python/cpython/2.7/default.nix b/nixpkgs/pkgs/development/interpreters/python/cpython/2.7/default.nix
index 696be2136ecc..62aae7b22129 100644
--- a/nixpkgs/pkgs/development/interpreters/python/cpython/2.7/default.nix
+++ b/nixpkgs/pkgs/development/interpreters/python/cpython/2.7/default.nix
@@ -12,6 +12,7 @@
 , zlib
 , self
 , configd, coreutils
+, autoreconfHook
 , python-setup-hook
 # Some proprietary libs assume UCS2 unicode, especially on darwin :(
 , ucsEncoding ? 4
@@ -22,6 +23,7 @@
 , sha256
 , passthruFun
 , static ? false
+, enableOptimizations ? (!stdenv.isDarwin)
 }:
 
 assert x11Support -> tcl != null
@@ -85,6 +87,9 @@ let
       # backported in debian since 2013.
       # https://bugs.python.org/issue13146
       ./atomic_pyc.patch
+
+      # Backport from CPython 3.8 of a good list of tests to run for PGO.
+      ./profile-task.patch
     ] ++ optionals (x11Support && stdenv.isDarwin) [
       ./use-correct-tcl-tk-on-darwin.patch
     ] ++ optionals stdenv.isLinux [
@@ -134,7 +139,9 @@ let
         --replace 'os.popen(comm)' 'os.popen("${coreutils}/bin/nproc")'
     '';
 
-  configureFlags = [
+  configureFlags = optionals enableOptimizations [
+    "--enable-optimizations"
+  ] ++ [
     "--enable-shared"
     "--with-threads"
     "--enable-unicode=ucs${toString ucsEncoding}"
@@ -182,8 +189,9 @@ let
     ++ optionals x11Support [ tcl tk xlibsWrapper libX11 ]
     ++ optional (stdenv.isDarwin && configd != null) configd;
   nativeBuildInputs =
-    optionals (stdenv.hostPlatform != stdenv.buildPlatform)
-    [ buildPackages.stdenv.cc buildPackages.python ];
+    [ autoreconfHook ]
+    ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform)
+      [ buildPackages.stdenv.cc buildPackages.python ];
 
   mkPaths = paths: {
     C_INCLUDE_PATH = makeSearchPathOutput "dev" "include" paths;