Merge pull request #84072 from gnprice/python-build

cpython: Use optimizations, for a 25% speedup.

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
@@ -85,6 +86,9 @@ 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 [
@@ -96,6 +100,13 @@ let
       # libuuid, slowing down program startup a lot).
       ./no-ldconfig.patch
 
+      # Optimize symbol tables for the sake of dynamic linking.
+      # Significant for Python because of extension modules.
+      (fetchpatch {
+        url = "https://salsa.debian.org/cpython-team/python3/-/raw/27103a32e/debian/patches/link-opt.diff";
+        sha256 = "0vp36276ndbrwr7882vg7vjd61c8mv7bqgal6bbh2fimp6zlkdhv";
+      })
+
     ] ++ optionals stdenv.hostPlatform.isCygwin [
       ./2.5.2-ctypes-util-find_library.patch
       ./2.5.2-tkinter-x11.patch
@@ -135,6 +146,7 @@ let
     '';
 
   configureFlags = [
+    "--enable-optimizations"
     "--enable-shared"
     "--with-threads"
     "--enable-unicode=ucs${toString ucsEncoding}"
@@ -182,8 +194,9 @@ 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;