Docs for how to build on RHEL/CentOS

[sergeymx]

Bug report

Bug description:

I have been building all versions ( 3.11.5 and below) of Python on my el7 (CentOS 7) system with no problems.
(with the help of : devtoolset-8-gcc-8.3.1-3.2.el7.x86_64.rpm)
Now 3.12 is out and I can't build it.

Rebuilding with profile guided optimizations:
rm -f profile-clean-stamp
make build_all CFLAGS_NODIST=" -fprofile-use -fprofile-correction" LDFLAGS_NODIST=""
make[1]: Entering directory `/builddir/build/BUILD/Python-3.12.0'
gcc -pthread -shared -L/usr/lib64/openssl11 -lssl -lcrypto    -fno-semantic-interposition   Modules/_tkinter.o Modules/tkappinit.o   -o Modules/_tkinter.cpython-312-x86_64-linux-gnu.so
gcc: error: unrecognized command line option '-fno-semantic-interposition'
make[1]: Leaving directory `/builddir/build/BUILD/Python-3.12.0'
make[1]: *** [Modules/_tkinter.cpython-312-x86_64-linux-gnu.so] Error 1
make: *** [profile-opt] Error 2

P.S. Build Python 3.11.6 - no problem.

CPython versions tested on:

3.12

Operating systems tested on:

Linux

[erlend-aasland]

Nothing changed in configure.ac or Makefile.pre.in related to -fno-semantic-interposition between the 3.11 and 3.12; the compiler checks are exactly the same. Perhaps it is a bug in your environment?

[erlend-aasland]

main:

cpython/configure.ac

Lines 1596 to 1611 in 6592976

	if test "$Py_OPT" = 'true' ; then
	# Intentionally not forcing Py_LTO='true' here. Too many toolchains do not
	# compile working code using it and both test_distutils and test_gdb are
	# broken when you do manage to get a toolchain that works with it. People
	# who want LTO need to use --with-lto themselves.
	DEF_MAKE_ALL_RULE="profile-opt"
	REQUIRE_PGO="yes"
	DEF_MAKE_RULE="build_all"
	case $CC in
	*gcc*)
	AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
	CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
	LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
	])
	;;
	esac

3.12:

cpython/configure.ac

Lines 1763 to 1778 in 4da8c1b

	if test "$Py_OPT" = 'true' ; then
	# Intentionally not forcing Py_LTO='true' here. Too many toolchains do not
	# compile working code using it and both test_distutils and test_gdb are
	# broken when you do manage to get a toolchain that works with it. People
	# who want LTO need to use --with-lto themselves.
	DEF_MAKE_ALL_RULE="profile-opt"
	REQUIRE_PGO="yes"
	DEF_MAKE_RULE="build_all"
	case $CC in
	*gcc*)
	AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
	CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
	LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
	])
	;;
	esac

3.11:

cpython/configure.ac

Lines 1749 to 1764 in b0e43cb

	if test "$Py_OPT" = 'true' ; then
	# Intentionally not forcing Py_LTO='true' here. Too many toolchains do not
	# compile working code using it and both test_distutils and test_gdb are
	# broken when you do manage to get a toolchain that works with it. People
	# who want LTO need to use --with-lto themselves.
	DEF_MAKE_ALL_RULE="profile-opt"
	REQUIRE_PGO="yes"
	DEF_MAKE_RULE="build_all"
	case $CC in
	*gcc*)
	AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
	CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
	LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
	])
	;;
	esac

[sergeymx]

Thank you for your reply. I understand what you are writing about, but I am building in an isolated MOСK environment and I can't change the environment there.

I started scrutinizing the build log and saw :
make[1]: *** [Modules/_tkinter.cpython-312-x86_64-linux-gnu.so] Error 1
...
ERROR] _tkinter failed to import: /builddir/build/BUILD/Python-3.12.0/build/lib.linux-x86_64-3.12/_tkinter.cpython-312-x86_64-linux
-gnu.so: undefined symbol: Tk_Init
The necessary bits to build these optional modules were not found:
_dbm _gdbm _lzma
To find the necessary bits, look in configure.ac and config.log.
Following modules built successfully but were removed because they could not be imported:
_tkinter

Thank you.

[sergeymx]

For some reason the tkinter module is not being built.
I have read the changes for 3.12.0 and it doesn't say that it was changed in relation to 3.11.6.

tk-devel-1:8.5.13-6.el7.x86_64

[erlend-aasland]

You need to set the TCLTK_CFLAGS and TCLTK_LIBS environment variables correctly when invoking configure. Run ./configure --help and grep for TCL. See also the devguide. Note that configure uses pkgconfig to detect dependencies.

Tcl/Tk detection did not change between 3.11 and 3.12; it is exactly the same code in configure.ac.

[sergeymx]

diff build.log

3.11.6

*** WARNING: renaming "_tkinter" since importing it failed: /builddir/build/BUILD/Python-3.11.6/build/lib.linux-x86_64-3.11/_tkinter
.cpython-311-x86_64-linux-gnu.so: undefined symbol: Tk_Init
The necessary bits to build these optional modules were not found:
_dbm _gdbm _lzma
To find the necessary bits, look in setup.py in detect_modules() for the module's name.
Following modules built successfully but were removed because they could not be imported:
_tkinter

3.12.6

[ERROR] _tkinter failed to import: /builddir/build/BUILD/Python-3.12.0/build/lib.linux-x86_64-3.12/_tkinter.cpython-312-x86_64-linux
-gnu.so: undefined symbol: Tk_Init
The necessary bits to build these optional modules were not found:
_dbm _gdbm _lzma
To find the necessary bits, look in configure.ac and config.log.
Following modules built successfully but were removed because they could not be imported:
_tkinter

[erlend-aasland]

I'm sorry, @sergeymx, but I don't understand your responses. First you report a failure with the PGO step (gcc: error: unrecognized command line option '-fno-semantic-interposition'). Then focus is changed to the _tkinter module. Now in your last post, it seems there is no difference between 3.11 and 3.12; you get an error in both cases. I'm unsure of what to make of all this. If you have multiple issues, please try to pinpoint them and create deterministic reproducers for each. Include as much context as you can (how did you invoke configure, what is your environment, etc.).

[sergeymx]

I know what you mean.
I build in CentOS 7 (last) in an isolated MOСK (https://rpm-software-management.github.io/mock/) environment, so that the build dependencies are correct.

1. I think the error about -fno-semantic-interposition came from the fact that the _tkinter module was not built.

2. In 3.11.6 there was no error but a WARNING, in 3.12.0 there was an ERROR in the same place, and it already caused a build failure.

Now I'm trying to build to not have this error at all, but so far it does not work.

[sergeymx]

In 3.11.6 there was no error but a WARNING, in 3.12.0 there was an ERROR in the same place, and it already caused a build failure.
Here's a similar bug that was never closed.

• bpo-31817

[sergeymx]

I use : 504da3c
Add to spec: export TCLTK_LIBS="-ltk8.5 -ltkstub8.5 -ltcl8.5"

All build and all works !
THANKS.