Too many build tool chains do not properly support it, including building
and linking an executable fine that simply segfaults when you try to run
it (such as debian jessie 8.5's gcc 4.9). On others where it does appear
to build (ubuntu 16.04's gcc 5.4) there are still test_distutils and test_gdb
failures to deal with.
We're not going to spend time attempting to maintain a complicated white list
of what does and doesn't work in our configure.ac file.
required for PGO linking - to be a configure time error rather than
make time when --with-optimizations is enabled. Also improve our
ability to find the llvm-profdata tool on MacOS and some Linuxes.
The dependendency on the $(PGEN) variable must only be
set when not cross-compiling. When cross-compiling,
$(PGEN) will not be used, so no need to build it.
Patch by Thomas Perl.
enable link time optimizations at build time during a make profile-opt.
Some compilers and toolchains are known to not produce stable code when
using LTO, be sure to test things thoroughly before relying on it.
It can provide a few % speed up over profile-opt alone.
The backport of ensurepip to 2.7.9 allows pip to optionally be installed
or upgraded using the bundled pip provided by the new ensurepip module.
The option can be specified persistently using the configure option:
./configure --with-ensurepip[=upgrade|install|no]
It can also be overridden on either the "install" or "altinstall" targets:
make [alt]install ENSUREPIP=[upgrade|install|no]
For Python 2, the default option is "no" (do not install pip).
python --generate-posix-vars in pybuilddir.txt build target by ensuring
that pybuilddir.txt is always regenerated when configure is run and
that the newly built skeleton python does not inadvertently import
modules from previously installed instances.
when building _tkinter. configure has two new options; if used, both must
be specified:
./configure \
--with-tcltk-includes="-I/opt/local/include" \
--with-tcltk-libs="-L/opt/local/lib -ltcl8.5 -ltk8.5"
In addition, the options can be overridden with make:
make \
TCLTK_INCLUDES="-I/opt/local/include" \
TCLTK_LIBS="-L/opt/local/lib -ltcl8.6 -ltk8.6"
Unlike 3.2, 3.3 and 3.x, which add "-IObjects -IPython -IInclude" to
BASECPPFLAGS when building out-of-tree, 2.7 only needs to add -IInclude
(for Python-ast.h and graminit.h).
Benjamin Peterson
Martin Panter
Gregory P. Smith ext:(%20%5BGoogle%20Inc.%5D)
Zachary Ware
Brett Cannon
Stefan Krah
doko@ubuntu.com
Victor Stinner
Ned Deily
Christian Heimes
doko@python.org
Charles-François Natali
Trent Nelson
Mark Dickinson