From 79c28121306ee26856414724b1efe0ed65318085 Mon Sep 17 00:00:00 2001
From: Marius Bakke <marius@gnu.org>
Date: Thu, 22 Jul 2021 00:33:31 +0200
Subject: gnu: Python: Compile bytecode in all outputs.

* gnu/packages/python.scm (python-2.7)[arguments]: Ensure the post-install
phases run in order.  Move rebuild-bytecode last and run it on every output.
* gnu/packages/python.scm (python-3.9)[arguments]: Run the rebuild-bytecode
phase on every output.
---
 gnu/packages/python.scm | 95 ++++++++++++++++++++++++++-----------------------
 1 file changed, 51 insertions(+), 44 deletions(-)

diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 8a8fe2bd2a..cee8613b34 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -310,31 +310,7 @@
                      '("email/test" "ctypes/test" "unittest/test" "tkinter/test"
                        "sqlite3/test" "bsddb/test" "lib-tk/test" "lib2to3/tests"
                        "json/tests" "distutils/tests"))))))))
-         (add-after 'remove-tests 'rebuild-bytecode
-           (lambda* (#:key outputs #:allow-other-keys)
-             (let ((out (assoc-ref outputs "out")))
-               ;; Disable hash randomization to ensure the generated .pycs
-               ;; are reproducible.
-               (setenv "PYTHONHASHSEED" "0")
-               (for-each
-                (lambda (opt)
-                  (format #t "Compiling with optimization level: ~a\n"
-                          (if (null? opt) "none" (car opt)))
-                  (apply invoke
-                         `(,,(if (%current-target-system)
-                                 "python2"
-                                 '(string-append out "/bin/python"))
-                           ,@opt
-                           "-m" "compileall"
-                           "-f"         ; force rebuild
-                           ;; Don't build lib2to3, because it contains Python 3 code.
-                           "-x" "lib2to3/.*"
-                           ,out)))
-                ;; Python 2 has a single file extension (.pyo) for the chosen
-                ;; level of optimization, so it doesn't make sense to byte
-                ;; compile with more than one level.
-                (list '() '("-OO"))))))
-         (add-after 'install 'move-tk-inter
+         (add-after 'remove-tests 'move-tk-inter
            (lambda* (#:key outputs #:allow-other-keys)
              ;; When Tkinter support is built move it to a separate output so
              ;; that the main output doesn't contain a reference to Tcl/Tk.
@@ -354,7 +330,7 @@
                                     "/site-packages")))
                       (install-file tkinter.so target)
                       (delete-file tkinter.so))))))))
-         (add-after 'install 'move-idle
+         (add-after 'move-tk-inter 'move-idle
            (lambda* (#:key outputs #:allow-other-keys)
              ;; when idle is built, move it to a separate output to save some
              ;; space (5MB)
@@ -375,6 +351,33 @@
                                                   "/site-packages")))
                       (mkdir-p (dirname target))
                       (rename-file idlelib target))))))))
+         (add-after 'move-idle 'rebuild-bytecode
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out")))
+               ;; Disable hash randomization to ensure the generated .pycs
+               ;; are reproducible.
+               (setenv "PYTHONHASHSEED" "0")
+               (for-each
+                (lambda (output)
+                  (for-each (lambda (opt)
+                              (format #t "Compiling with optimization level: ~a\n"
+                                      (if (null? opt) "none" (car opt)))
+                              (apply invoke
+                                     `(,,(if (%current-target-system)
+                                             "python2"
+                                             '(string-append out "/bin/python"))
+                                       ,@opt
+                                       "-m" "compileall"
+                                       "-f" ; force rebuild
+                                       ;; Don't build lib2to3, because it contains
+                                       ;; Python 3 code.
+                                       "-x" "lib2to3/.*"
+                                       ,output)))
+                            ;; Python 2 has a single file extension (.pyo) for the
+                            ;; chosen level of optimization, so it doesn't make
+                            ;; sense to byte compile with more than one level.
+                            (list '() '("-OO"))))
+                (map cdr outputs)))))
          (add-after 'install 'install-sitecustomize.py
            ,(customize-site version)))))
     (inputs
@@ -534,25 +537,29 @@ data types.")
                  ;; are reproducible.
                  (setenv "PYTHONHASHSEED" "0")
 
-                 ;; XXX: Delete existing auto-generated pycs beforehand because
-                 ;; the -f argument does not necessarily overwrite all files,
-                 ;; leading to indeterministic results.
-                 (for-each (lambda (pyc)
-                             (delete-file pyc))
-                           (find-files out "\\.pyc$"))
+                 (for-each (lambda (output)
+                             ;; XXX: Delete existing pycs generated by the build
+                             ;; system beforehand because the -f argument does
+                             ;; not necessarily overwrite all files, leading to
+                             ;; indeterministic results.
+                             (for-each (lambda (pyc)
+                                         (delete-file pyc))
+                                       (find-files output "\\.pyc$"))
 
-                 (apply invoke
-                        `(,,(if (%current-target-system)
-                                "python3"
-                                '(string-append out
-                                                "/bin/python3"))
-                          "-m" "compileall"
-                          "-o" "0" "-o" "1" "-o" "2"
-                          "-f" ; force rebuild
-                          "--invalidation-mode=unchecked-hash"
-                          ;; Don't build lib2to3, because it's Python 2 code.
-                          "-x" "lib2to3/.*"
-                          ,out)))))
+                             (apply invoke
+                                    `(,,(if (%current-target-system)
+                                            "python3"
+                                            '(string-append out
+                                                            "/bin/python3"))
+                                      "-m" "compileall"
+                                      "-o" "0" "-o" "1" "-o" "2"
+                                      "-f" ; force rebuild
+                                      "--invalidation-mode=unchecked-hash"
+                                      ;; Don't build lib2to3, because it's
+                                      ;; Python 2 code.
+                                      "-x" "lib2to3/.*"
+                                      ,output)))
+                           (map cdr outputs)))))
            (replace 'install-sitecustomize.py
              ,(customize-site version))))))
     (native-inputs
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