Bug 1449629 - Install Python 3.5 in Debian 7 base image; r=glandium

Debian 7 ships Python 3.2 by default. That's too old for our
upcoming build requirement of Python 3.5.

This commit adds a Python 3.5 package for wheezy that backports
the Python 3.5 from a much later Debian version.

The patch was inspired by the existing patch for Python 2.7.
However, it needed additional work. The changes and reasons
should all be documented in the changelog file as part of the
package diff we apply.

I'm a bit disappointed we had to disable PGO. But it was
reliably segfaulting during the build. I didn't feel like going
down that rabbit hole.

MozReview-Commit-ID: ABpHW1KYFQP

--HG--
extra : rebase_source : 02dbd13236fe741cb33f07c803218fda339c214e

build/debian-packages/python3.5-wheezy.diff

@@ -0,0 +1,192 @@
+diff --git a/debian/changelog b/debian/changelog
+index e19964f..0bc60c2 100644
+--- a/debian/changelog
++++ b/debian/changelog
+@@ -1,3 +1,21 @@
++python3.5 (3.5.3-1.deb7moz1) wheezy; urgency=medium
++
++  * Mozilla backport for wheezy.
++  * debian/control.in:
++    - Remove libmpdec-dev dependency; wheezy doesn't have it; Python
++      vendors it.
++    - Remove libexpat1-dev dependency; it prevents co-installing some
++      i386 -dev packages.
++  * debian/rules:
++    - Adapt ar, ranlib, and objcopy paths to work on wheezy.
++    - Remove --with-system-libmpdec because wheezy doesn't have it.
++    - Disable PGO builds because they segfault.
++    - Remove -Og from debug builds because GCC 4.7 doesn't like it.
++  * debian/control.in, debian/rules: Don't generate the -doc package
++    and HTML documentation.
++
++ -- Gregory Szorc <gps@mozilla.com>  Thu, 29 Mar 2018 20:00:00 -0700
++
+ python3.5 (3.5.3-1) unstable; urgency=medium
+ 
+   * Python 3.5.3 release.
+diff --git a/debian/control.in b/debian/control.in
+index 7d36556..ec1af78 100644
+--- a/debian/control.in
++++ b/debian/control.in
+@@ -9,7 +9,6 @@ Build-Depends: debhelper (>= 9), @bd_dpkgdev@
+   zlib1g-dev, libbz2-dev, liblzma-dev,
+   libgdbm-dev, libdb-dev,
+   tk-dev, blt-dev (>= 2.4z), libssl-dev,
+-  libexpat1-dev, libmpdec-dev (>= 2.4),
+   libbluetooth-dev [!hurd-i386 !kfreebsd-i386 !kfreebsd-amd64],
+   locales [!armel !avr32 !hppa !ia64 !mipsel],
+   libsqlite3-dev, libffi-dev (>= 3.0.5) [!or1k !avr32],
+@@ -27,7 +26,7 @@ Architecture: any
+ Multi-Arch: allowed
+ Priority: @PRIO@
+ Depends: @PVER@-minimal (= ${binary:Version}), lib@PVER@-stdlib (= ${binary:Version}), mime-support, ${shlibs:Depends}, ${misc:Depends}
+-Suggests: @PVER@-venv, @PVER@-doc, binutils
++Suggests: @PVER@-venv, binutils
+ Description: Interactive high-level object-oriented language (version @VER@)
+  Python is a high-level, interactive, object-oriented language. Its @VER@ version
+  includes an extensive class library with lots of goodies for
+@@ -115,7 +114,7 @@ Description: Examples for the Python language (v@VER@)
+ Package: @PVER@-dev
+ Architecture: any
+ Multi-Arch: allowed
+-Depends: @PVER@ (= ${binary:Version}), lib@PVER@-dev (= ${binary:Version}), lib@PVER@ (= ${binary:Version}), libexpat1-dev, ${shlibs:Depends}, ${misc:Depends}
++Depends: @PVER@ (= ${binary:Version}), lib@PVER@-dev (= ${binary:Version}), lib@PVER@ (= ${binary:Version}), ${shlibs:Depends}, ${misc:Depends}
+ Recommends: libc6-dev | libc-dev
+ Description: Header files and a static library for Python (v@VER@)
+  Header files, a static library and development tools for building
+@@ -129,7 +128,7 @@ Section: libdevel
+ Architecture: any
+ Multi-Arch: same
+ Pre-Depends: ${misc:Pre-Depends}
+-Depends: lib@PVER@-stdlib (= ${binary:Version}), lib@PVER@ (= ${binary:Version}), libexpat1-dev, ${shlibs:Depends}, ${misc:Depends}
++Depends: lib@PVER@-stdlib (= ${binary:Version}), lib@PVER@ (= ${binary:Version}), ${shlibs:Depends}, ${misc:Depends}
+ Recommends: libc6-dev | libc-dev
+ Description: Header files and a static library for Python (v@VER@)
+  Header files, a static library and development tools for building
+@@ -161,28 +160,6 @@ Description: IDE for Python (v@VER@) using Tkinter
+  IDLE is an Integrated Development Environment for Python (v@VER@).
+  IDLE is written using Tkinter and therefore quite platform-independent.
+ 
+-Package: @PVER@-doc
+-Section: doc
+-Architecture: all
+-Multi-Arch: foreign
+-Depends: libjs-jquery, libjs-underscore, ${misc:Depends}
+-Suggests: @PVER@
+-Description: Documentation for the high-level object-oriented language Python (v@VER@)
+- These is the official set of documentation for the interactive high-level
+- object-oriented language Python (v@VER@). All documents are provided
+- in HTML format. The package consists of ten documents:
+- .
+-   * What's New in Python@VER@
+-   * Tutorial
+-   * Python Library Reference
+-   * Macintosh Module Reference
+-   * Python Language Reference
+-   * Extending and Embedding Python
+-   * Python/C API Reference
+-   * Installing Python Modules
+-   * Documenting Python
+-   * Distributing Python Modules
+-
+ Package: @PVER@-dbg
+ Section: debug
+ Architecture: any
+diff --git a/debian/rules b/debian/rules
+index 05895da..294d432 100755
+--- a/debian/rules
++++ b/debian/rules
+@@ -136,14 +136,14 @@ endif
+ CC=$(DEB_HOST_GNU_TYPE)-gcc
+ CXX=$(DEB_HOST_GNU_TYPE)-g++
+ 
+-AR=$(DEB_HOST_GNU_TYPE)-ar
+-RANLIB=$(DEB_HOST_GNU_TYPE)-ranlib
++AR=$(DEB_HOST_GNU_TYPE)-gcc-ar-4.7
++RANLIB=$(DEB_HOST_GNU_TYPE)-gcc-ranlib-4.7
+ 
+ DPKG_CPPFLAGS:= $(shell dpkg-buildflags --get CPPFLAGS)
+ DPKG_CFLAGS  := $(shell dpkg-buildflags --get CFLAGS)
+ DPKG_LDFLAGS := $(shell dpkg-buildflags --get LDFLAGS)
+ OPT_CFLAGS   := $(filter-out -O%,$(DPKG_CFLAGS)) # default is -O3
+-DEBUG_CFLAGS := $(patsubst -O%,-Og,$(DPKG_CFLAGS))
++DEBUG_CFLAGS := $(DPKG_CFLAGS)
+ 
+ # on alpha, use -O2 only, use -mieee
+ ifeq ($(DEB_HOST_ARCH),alpha)
+@@ -155,14 +155,6 @@ ifeq ($(DEB_HOST_ARCH),m68k)
+     EXTRA_OPT_FLAGS += -O2
+ endif
+ 
+-ifeq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))
+-  ifeq ($(DEB_HOST_ARCH_OS),linux)
+-    ifneq (,$(findstring $(DEB_HOST_ARCH), amd64 armel armhf i386 powerpc ppc64 ppc64el s390x))
+-      with_pgo := yes
+-    endif
+-  endif
+-endif
+-
+ ifneq (,$(findstring $(DEB_HOST_ARCH), amd64 armel armhf i386 powerpc ppc64 ppc64el s390x))
+   with_lto := yes
+ endif
+@@ -187,8 +179,6 @@ ifeq ($(with_lto),yes)
+       LTO_CFLAGS += -ffat-lto-objects
+     endif
+     EXTRA_OPT_CFLAGS += $(LTO_CFLAGS)
+-    AR=$(DEB_HOST_GNU_TYPE)-gcc-ar
+-    RANLIB=$(DEB_HOST_GNU_TYPE)-gcc-ranlib
+ endif
+ 
+ make_build_target = $(if $(with_pgo),profile-opt)
+@@ -322,7 +312,6 @@ common_configure_args = \
+ 		--with-computed-gotos \
+ 		--without-ensurepip \
+ 		--with-system-expat \
+-		--with-system-libmpdec \
+ 
+ ifneq (,$(filter $(DEB_HOST_ARCH), avr32 or1k))
+   common_configure_args += --without-ffi
+@@ -659,7 +648,6 @@ minimal-test:
+ 
+ stamps/stamp-doc-html:
+ 	dh_testdir
+-	$(MAKE) -C Doc html
+ 	@mkdir -p stamps
+ 	touch stamps/stamp-doc-html
+ 
+@@ -1299,26 +1287,6 @@ binary-indep: build-indep install stamps/stamp-control
+ 	dh_testdir -i
+ 	dh_testroot -i
+ 
+-	: # $(p_doc) package
+-	dh_installdirs -p$(p_doc) \
+-		usr/share/doc/$(p_base) \
+-		usr/share/doc/$(p_doc)
+-	dh_installdocs -p$(p_doc)
+-	cp -a Doc/build/html $(d_doc)/usr/share/doc/$(p_base)/
+-	rm -f $(d_doc)/usr/share/doc/$(p_base)/html/_static/jquery.js
+-	dh_link -p$(p_doc) \
+-		/usr/share/doc/$(p_base)/html /usr/share/doc/$(p_doc)/html \
+-		/usr/share/javascript/jquery/jquery.js /usr/share/doc/$(p_base)/html/_static/jquery.js \
+-		/usr/share/javascript/underscore/underscore.js /usr/share/doc/$(p_base)/html/_static/underscore.js
+-
+-	: # devhelp docs
+-	cd $(buildd_static) && ./python ../debian/pyhtml2devhelp.py \
+-		../$(d_doc)/usr/share/doc/$(p_base)/html index.html $(VER) \
+-		> ../$(d_doc)/usr/share/doc/$(p_base)/html/$(PVER).devhelp
+-	gzip -9nv $(d_doc)/usr/share/doc/$(p_base)/html/$(PVER).devhelp
+-	dh_link -p$(p_doc) \
+-		/usr/share/doc/$(p_base)/html /usr/share/devhelp/books/$(PVER)
+-
+ 	for i in $(p_ltst); do \
+ 	  rm -rf debian/$$i/usr/share/doc/$$i; \
+ 	  ln -s $(p_base) debian/$$i/usr/share/doc/$$i; \
+@@ -1377,7 +1345,7 @@ ifneq ($(with_gdbm),yes)
+ endif
+ 
+ 	find $(d_ldbg) $(d_ldev) -name '*.a' ! -type l \
+-		| xargs -n 1 $(DEB_HOST_GNU_TYPE)-objcopy -p --remove-section=.gnu.lto_.*
++		| xargs -n 1 objcopy -p --remove-section=.gnu.lto_.*
+ 	dh_strip -a -N$(p_dbg) -N$(p_ldbg) -Xdebug -Xdbg --dbg-package=$(p_dbg)
+ 	mkdir -p $(d_dbg)/usr/share/gdb/auto-load/usr/bin
+ 	cp Tools/gdb/libpython.py $(d_dbg)/usr/share/gdb/auto-load/usr/bin/$(PVER)m-gdb.py

taskcluster/ci/docker-image/kind.yml

@@ -34,6 +34,7 @@ jobs:
       - deb7-make
       - deb7-mercurial
       - deb7-python
+      - deb7-python3.5
       - deb7-xz-utils
   toolchain-build:
     symbol: I(toolchain)

taskcluster/ci/packages/kind.yml

@@ -35,6 +35,18 @@ jobs:
       patch: python-wheezy.diff
       pre-build-command: debian/rules control-file
 
+  deb7-python3.5:
+    description: "Python 3.5 backport for Debian wheezy"
+    treeherder:
+      symbol: Deb7(python3.5)
+    run:
+      using: debian-package
+      dsc:
+        url: http://snapshot.debian.org/archive/debian/20170119T211826Z/pool/main/p/python3.5/python3.5_3.5.3-1.dsc
+        sha256: 5259cbb15bb93f7bdfbe9ce03a972ea47f81c86057d5939ef9ce578414b2f1de
+      patch: python3.5-wheezy.diff
+      pre-build-command: debian/rules control-file
+
   deb7-cmake:
     description: "Cmake backport for Debian wheezy"
     treeherder: