3. Configure Python¶
3.1. Build Requirements¶
Features required to build CPython:
- A C11 compiler. Optional C11 features are not required. 
- Support for IEEE 754 floating-point numbers and floating-point Not-a-Number (NaN). 
- Support for threads. 
- On Windows, Microsoft Visual Studio 2017 or later is required. 
Changed in version 3.5: On Windows, Visual Studio 2015 or later is required.
Changed in version 3.6: Selected C99 features are now required, like <stdint.h> and static
inline functions.
Changed in version 3.7: Thread support and OpenSSL 1.0.2 are now required.
Changed in version 3.10: OpenSSL 1.1.1 is now required.
Changed in version 3.11: C11 compiler, IEEE 754 and NaN support are now required. On Windows, Visual Studio 2017 or later is required.
See also PEP 7 “Style Guide for C Code” and PEP 11 “CPython platform support”.
3.2. Generated files¶
To reduce build dependencies, Python source code contains multiple generated files. Commands to regenerate all generated files:
make regen-all
make regen-stdlib-module-names
make regen-limited-abi
make regen-configure
The Makefile.pre.in file documents generated files, their inputs, and tools used
to regenerate them. Search for regen-* make targets.
3.2.1. configure script¶
The make regen-configure command regenerates the aclocal.m4 file and
the configure script using the Tools/build/regen-configure.sh shell
script which uses an Ubuntu container to get the same tools versions and have a
reproducible output.
The container is optional, the following command can be run locally:
autoreconf -ivf -Werror
The generated files can change depending on the exact autoconf-archive,
aclocal and pkg-config versions.
3.3. Configure Options¶
List all ./configure script options using:
./configure --help
See also the Misc/SpecialBuilds.txt in the Python source distribution.
3.3.1. General Options¶
- --enable-loadable-sqlite-extensions¶
- Support loadable extensions in the - _sqliteextension module (default is no) of the- sqlite3module.- See the - sqlite3.Connection.enable_load_extension()method of the- sqlite3module.- Added in version 3.6. 
- --enable-big-digits=[15|30]¶
- Define the size in bits of Python - intdigits: 15 or 30 bits.- By default, the digit size is 30. - Define the - PYLONG_BITS_IN_DIGITto- 15or- 30.
- --with-suffix=SUFFIX¶
- Set the Python executable suffix to SUFFIX. - The default suffix is - .exeon Windows and macOS (- python.exeexecutable),- .json Emscripten node,- .htmlon Emscripten browser,- .wasmon WASI, and an empty string on other platforms (- pythonexecutable).- Changed in version 3.11: The default suffix on WASM platform is one of - .js,- .htmlor- .wasm.
- --with-tzpath=<list of absolute paths separated by pathsep>¶
- Select the default time zone search path for - zoneinfo.TZPATH. See the Compile-time configuration of the- zoneinfomodule.- Default: - /usr/share/zoneinfo:/usr/lib/zoneinfo:/usr/share/lib/zoneinfo:/etc/zoneinfo.- See - os.pathseppath separator.- Added in version 3.9. 
- --without-decimal-contextvar¶
- Build the - _decimalextension module using a thread-local context rather than a coroutine-local context (default), see the- decimalmodule.- See - decimal.HAVE_CONTEXTVARand the- contextvarsmodule.- Added in version 3.9. 
- --with-dbmliborder=<list of backend names>¶
- Override order to check db backends for the - dbmmodule- A valid value is a colon ( - :) separated string with the backend names:- ndbm;
- gdbm;
- bdb.
 
- --without-c-locale-coercion¶
- Disable C locale coercion to a UTF-8 based locale (enabled by default). - Don’t define the - PY_COERCE_C_LOCALEmacro.- See - PYTHONCOERCECLOCALEand the PEP 538.
- --without-freelists¶
- Disable all freelists except the empty tuple singleton. - Added in version 3.11. 
- --with-platlibdir=DIRNAME¶
- Python library directory name (default is - lib).- Fedora and SuSE use - lib64on 64-bit platforms.- See - sys.platlibdir.- Added in version 3.9. 
- --with-wheel-pkg-dir=PATH¶
- Directory of wheel packages used by the - ensurepipmodule (none by default).- Some Linux distribution packaging policies recommend against bundling dependencies. For example, Fedora installs wheel packages in the - /usr/share/python-wheels/directory and don’t install the- ensurepip._bundledpackage.- Added in version 3.10. 
- --with-pkg-config=[check|yes|no]¶
- Whether configure should use pkg-config to detect build dependencies. - check(default): pkg-config is optional
- yes: pkg-config is mandatory
- no: configure does not use pkg-config even when present
 - Added in version 3.11. 
- --enable-pystats¶
- Turn on internal statistics gathering. - The statistics will be dumped to a arbitrary (probably unique) file in - /tmp/py_stats/, or- C:\temp\py_stats\on Windows. If that directory does not exist, results will be printed on stdout.- Use - Tools/scripts/summarize_stats.pyto read the stats.- Added in version 3.11. 
3.3.2. WebAssembly Options¶
- --with-emscripten-target=[browser|node]¶
- Set build flavor for - wasm32-emscripten.- browser(default): preload minimal stdlib, default MEMFS.
- node: NODERAWFS and pthread support.
 - Added in version 3.11. 
- --enable-wasm-dynamic-linking¶
- Turn on dynamic linking support for WASM. - Dynamic linking enables - dlopen. File size of the executable increases due to limited dead code elimination and additional features.- Added in version 3.11. 
- --enable-wasm-pthreads¶
- Turn on pthreads support for WASM. - Added in version 3.11. 
3.3.3. Install Options¶
- --prefix=PREFIX¶
- Install architecture-independent files in PREFIX. On Unix, it defaults to - /usr/local.- This value can be retrieved at runtime using - sys.prefix.- As an example, one can use - --prefix="$HOME/.local/"to install a Python in its home directory.
- --exec-prefix=EPREFIX¶
- Install architecture-dependent files in EPREFIX, defaults to - --prefix.- This value can be retrieved at runtime using - sys.exec_prefix.
3.3.4. Performance options¶
Configuring Python using --enable-optimizations --with-lto (PGO + LTO) is
recommended for best performance. The experimental --enable-bolt flag can
also be used to improve performance.
- --enable-optimizations¶
- Enable Profile Guided Optimization (PGO) using - PROFILE_TASK(disabled by default).- The C compiler Clang requires - llvm-profdataprogram for PGO. On macOS, GCC also requires it: GCC is just an alias to Clang on macOS.- Disable also semantic interposition in libpython if - --enable-sharedand GCC is used: add- -fno-semantic-interpositionto the compiler and linker flags.- Note - During the build, you may encounter compiler warnings about profile data not being available for some source files. These warnings are harmless, as only a subset of the code is exercised during profile data acquisition. To disable these warnings on Clang, manually suppress them by adding - -Wno-profile-instr-unprofiledto- CFLAGS.- Added in version 3.6. - Changed in version 3.10: Use - -fno-semantic-interpositionon GCC.
- PROFILE_TASK¶
- Environment variable used in the Makefile: Python command line arguments for the PGO generation task. - Default: - -m test --pgo --timeout=$(TESTTIMEOUT).- Added in version 3.8. 
- --with-lto=[full|thin|no|yes]¶
- Enable Link Time Optimization (LTO) in any build (disabled by default). - The C compiler Clang requires - llvm-arfor LTO (- aron macOS), as well as an LTO-aware linker (- ld.goldor- lld).- Added in version 3.6. - Added in version 3.11: To use ThinLTO feature, use - --with-lto=thinon Clang.- Changed in version 3.12: Use ThinLTO as the default optimization policy on Clang if the compiler accepts the flag. 
- --enable-bolt¶
- Enable usage of the BOLT post-link binary optimizer (disabled by default). - BOLT is part of the LLVM project but is not always included in their binary distributions. This flag requires that - llvm-boltand- merge-fdataare available.- BOLT is still a fairly new project so this flag should be considered experimental for now. Because this tool operates on machine code its success is dependent on a combination of the build environment + the other optimization configure args + the CPU architecture, and not all combinations are supported. BOLT versions before LLVM 16 are known to crash BOLT under some scenarios. Use of LLVM 16 or newer for BOLT optimization is strongly encouraged. - The - BOLT_INSTRUMENT_FLAGSand- BOLT_APPLY_FLAGSconfigure variables can be defined to override the default set of arguments for llvm-bolt to instrument and apply BOLT data to binaries, respectively.- Added in version 3.12. 
- --with-computed-gotos¶
- Enable computed gotos in evaluation loop (enabled by default on supported compilers). 
- --without-pymalloc¶
- Disable the specialized Python memory allocator pymalloc (enabled by default). - See also - PYTHONMALLOCenvironment variable.
- --without-doc-strings¶
- Disable static documentation strings to reduce the memory footprint (enabled by default). Documentation strings defined in Python are not affected. - Don’t define the - WITH_DOC_STRINGSmacro.- See the - PyDoc_STRVAR()macro.
- --enable-profiling¶
- Enable C-level code profiling with - gprof(disabled by default).
- --with-strict-overflow¶
- Add - -fstrict-overflowto the C compiler flags (by default we add- -fno-strict-overflowinstead).
3.3.5. Python Debug Build¶
A debug build is Python built with the --with-pydebug configure
option.
Effects of a debug build:
- Display all warnings by default: the list of default warning filters is empty in the - warningsmodule.
- Add - dto- sys.abiflags.
- Add - sys.gettotalrefcount()function.
- Add - -X showrefcountcommand line option.
- Add - -dcommand line option and- PYTHONDEBUGenvironment variable to debug the parser.
- Add support for the - __lltrace__variable: enable low-level tracing in the bytecode evaluation loop if the variable is defined.
- Install debug hooks on memory allocators to detect buffer overflow and other memory errors. 
- Define - Py_DEBUGand- Py_REF_DEBUGmacros.
- Add runtime checks: code surrounded by - #ifdef Py_DEBUGand- #endif. Enable- assert(...)and- _PyObject_ASSERT(...)assertions: don’t set the- NDEBUGmacro (see also the- --with-assertionsconfigure option). Main runtime checks:- Add sanity checks on the function arguments. 
- Unicode and int objects are created with their memory filled with a pattern to detect usage of uninitialized objects. 
- Ensure that functions which can clear or replace the current exception are not called with an exception raised. 
- Check that deallocator functions don’t change the current exception. 
- The garbage collector ( - gc.collect()function) runs some basic checks on objects consistency.
- The - Py_SAFE_DOWNCAST()macro checks for integer underflow and overflow when downcasting from wide types to narrow types.
 
See also the Python Development Mode and the
--with-trace-refs configure option.
Changed in version 3.8: Release builds and debug builds are now ABI compatible: defining the
Py_DEBUG macro no longer implies the Py_TRACE_REFS macro (see the
--with-trace-refs option), which introduces the only ABI
incompatibility.
3.3.6. Debug options¶
- --with-pydebug¶
- Build Python in debug mode: define the - Py_DEBUGmacro (disabled by default).
- --with-trace-refs¶
- Enable tracing references for debugging purpose (disabled by default). - Effects: - Define the - Py_TRACE_REFSmacro.
- Add - sys.getobjects()function.
- Add - PYTHONDUMPREFSenvironment variable.
 - This build is not ABI compatible with release build (default build) or debug build ( - Py_DEBUGand- Py_REF_DEBUGmacros).- Added in version 3.8. 
- --with-assertions¶
- Build with C assertions enabled (default is no): - assert(...);and- _PyObject_ASSERT(...);.- If set, the - NDEBUGmacro is not defined in the- OPTcompiler variable.- See also the - --with-pydebugoption (debug build) which also enables assertions.- Added in version 3.6. 
- --with-valgrind¶
- Enable Valgrind support (default is no). 
- --with-dtrace¶
- Enable DTrace support (default is no). - See Instrumenting CPython with DTrace and SystemTap. - Added in version 3.6. 
- --with-address-sanitizer¶
- Enable AddressSanitizer memory error detector, - asan(default is no).- Added in version 3.6. 
- --with-memory-sanitizer¶
- Enable MemorySanitizer allocation error detector, - msan(default is no).- Added in version 3.6. 
- --with-undefined-behavior-sanitizer¶
- Enable UndefinedBehaviorSanitizer undefined behaviour detector, - ubsan(default is no).- Added in version 3.6. 
3.3.7. Linker options¶
- Enable building a shared Python library: - libpython(default is no).
- --without-static-libpython¶
- Do not build - libpythonMAJOR.MINOR.aand do not install- python.o(built and enabled by default).- Added in version 3.10. 
3.3.8. Libraries options¶
- --with-libs='lib1 ...'¶
- Link against additional libraries (default is no). 
- --with-system-expat¶
- Build the - pyexpatmodule using an installed- expatlibrary (default is no).
- --with-system-libmpdec¶
- Build the - _decimalextension module using an installed- mpdeclibrary, see the- decimalmodule (default is no).- Added in version 3.3. 
- --with-readline=editline¶
- Use - editlinelibrary for backend of the- readlinemodule.- Define the - WITH_EDITLINEmacro.- Added in version 3.10. 
- --without-readline¶
- Don’t build the - readlinemodule (built by default).- Don’t define the - HAVE_LIBREADLINEmacro.- Added in version 3.10. 
- --with-libm=STRING¶
- Override - libmmath library to STRING (default is system-dependent).
- --with-libc=STRING¶
- Override - libcC library to STRING (default is system-dependent).
- --with-openssl=DIR¶
- Root of the OpenSSL directory. - Added in version 3.7. 
- --with-openssl-rpath=[no|auto|DIR]¶
- Set runtime library directory (rpath) for OpenSSL libraries: - no(default): don’t set rpath;
- auto: auto-detect rpath from- --with-openssland- pkg-config;
- DIR: set an explicit rpath. 
 - Added in version 3.10. 
3.3.9. Security Options¶
- --with-hash-algorithm=[fnv|siphash13|siphash24]¶
- Select hash algorithm for use in - Python/pyhash.c:- siphash13(default);
- siphash24;
- fnv.
 - Added in version 3.4. - Added in version 3.11: - siphash13is added and it is the new default.
- --with-builtin-hashlib-hashes=md5,sha1,sha256,sha512,sha3,blake2¶
- Built-in hash modules: - md5;
- sha1;
- sha256;
- sha512;
- sha3(with shake);
- blake2.
 - Added in version 3.9. 
- --with-ssl-default-suites=[python|openssl|STRING]¶
- Override the OpenSSL default cipher suites string: - python(default): use Python’s preferred selection;
- openssl: leave OpenSSL’s defaults untouched;
- STRING: use a custom string 
 - See the - sslmodule.- Added in version 3.7. - Changed in version 3.10: The settings - pythonand STRING also set TLS 1.2 as minimum protocol version.
3.3.10. macOS Options¶
See Mac/README.rst.
- --enable-universalsdk¶
- --enable-universalsdk=SDKDIR¶
- Create a universal binary build. SDKDIR specifies which macOS SDK should be used to perform the build (default is no). 
- --enable-framework¶
- --enable-framework=INSTALLDIR¶
- Create a Python.framework rather than a traditional Unix install. Optional INSTALLDIR specifies the installation path (default is no). 
- --with-universal-archs=ARCH¶
- Specify the kind of universal binary that should be created. This option is only valid when - --enable-universalsdkis set.- Options: - universal2;
- 32-bit;
- 64-bit;
- 3-way;
- intel;
- intel-32;
- intel-64;
- all.
 
- --with-framework-name=FRAMEWORK¶
- Specify the name for the python framework on macOS only valid when - --enable-frameworkis set (default:- Python).
3.3.11. Cross Compiling Options¶
Cross compiling, also known as cross building, can be used to build Python for another CPU architecture or platform. Cross compiling requires a Python interpreter for the build platform. The version of the build Python must match the version of the cross compiled host Python.
- --build=BUILD¶
- configure for building on BUILD, usually guessed by config.guess. 
- --host=HOST¶
- cross-compile to build programs to run on HOST (target platform) 
- --with-build-python=path/to/python¶
- path to build - pythonbinary for cross compiling- Added in version 3.11. 
- CONFIG_SITE=file¶
- An environment variable that points to a file with configure overrides. - Example config.site file: - # config.site-aarch64 ac_cv_buggy_getaddrinfo=no ac_cv_file__dev_ptmx=yes ac_cv_file__dev_ptc=no 
Cross compiling example:
CONFIG_SITE=config.site-aarch64 ../configure \
    --build=x86_64-pc-linux-gnu \
    --host=aarch64-unknown-linux-gnu \
    --with-build-python=../x86_64/python
3.4. Python Build System¶
3.4.1. Main files of the build system¶
- configure.ac=>- configure;
- Makefile.pre.in=>- Makefile(created by- configure);
- pyconfig.h(created by- configure);
- Modules/Setup: C extensions built by the Makefile using- Module/makesetupshell script;
3.4.2. Main build steps¶
- C files ( - .c) are built as object files (- .o).
- A static - libpythonlibrary (- .a) is created from objects files.
- python.oand the static- libpythonlibrary are linked into the final- pythonprogram.
- C extensions are built by the Makefile (see - Modules/Setup).
3.4.3. Main Makefile targets¶
- make: Build Python with the standard library.
- make platform:: build the- pythonprogram, but don’t build the standard library extension modules.
- make profile-opt: build Python using Profile Guided Optimization (PGO). You can use the configure- --enable-optimizationsoption to make this the default target of the- makecommand (- make allor just- make).
- make buildbottest: Build Python and run the Python test suite, the same way than buildbots test Python. Set- TESTTIMEOUTvariable (in seconds) to change the test timeout (1200 by default: 20 minutes).
- make install: Build and install Python.
- make regen-all: Regenerate (almost) all generated files;- make regen-stdlib-module-namesand- autoconfmust be run separately for the remaining generated files.
- make clean: Remove built files.
- make distclean: Same than- make clean, but remove also files created by the configure script.
3.4.4. C extensions¶
Some C extensions are built as built-in modules, like the sys module.
They are built with the Py_BUILD_CORE_BUILTIN macro defined.
Built-in modules have no __file__ attribute:
>>> import sys
>>> sys
<module 'sys' (built-in)>
>>> sys.__file__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'sys' has no attribute '__file__'
Other C extensions are built as dynamic libraries, like the _asyncio module.
They are built with the Py_BUILD_CORE_MODULE macro defined.
Example on Linux x86-64:
>>> import _asyncio
>>> _asyncio
<module '_asyncio' from '/usr/lib64/python3.9/lib-dynload/_asyncio.cpython-39-x86_64-linux-gnu.so'>
>>> _asyncio.__file__
'/usr/lib64/python3.9/lib-dynload/_asyncio.cpython-39-x86_64-linux-gnu.so'
Modules/Setup is used to generate Makefile targets to build C extensions.
At the beginning of the files, C extensions are built as built-in modules.
Extensions defined after the *shared* marker are built as dynamic libraries.
The PyAPI_FUNC(), PyAPI_DATA() and
PyMODINIT_FUNC macros of Include/exports.h are defined
differently depending if the Py_BUILD_CORE_MODULE macro is defined:
- Use - Py_EXPORTED_SYMBOLif the- Py_BUILD_CORE_MODULEis defined
- Use - Py_IMPORTED_SYMBOLotherwise.
If the Py_BUILD_CORE_BUILTIN macro is used by mistake on a C extension
built as a shared library, its PyInit_xxx() function is not exported,
causing an ImportError on import.
3.5. Compiler and linker flags¶
Options set by the ./configure script and environment variables and used by
Makefile.
3.5.1. Preprocessor flags¶
- CONFIGURE_CPPFLAGS¶
- Value of - CPPFLAGSvariable passed to the- ./configurescript.- Added in version 3.6. 
- CPPFLAGS¶
- (Objective) C/C++ preprocessor flags, e.g. - -Iinclude_dirif you have headers in a nonstandard directory include_dir.- Both - CPPFLAGSand- LDFLAGSneed to contain the shell’s value to be able to build extension modules using the directories specified in the environment variables.
- BASECPPFLAGS¶
- Added in version 3.4. 
- PY_CPPFLAGS¶
- Extra preprocessor flags added for building the interpreter object files. - Default: - $(BASECPPFLAGS) -I. -I$(srcdir)/Include $(CONFIGURE_CPPFLAGS) $(CPPFLAGS).- Added in version 3.2. 
3.5.2. Compiler flags¶
- CC¶
- C compiler command. - Example: - gcc -pthread.
- CXX¶
- C++ compiler command. - Example: - g++ -pthread.
- CFLAGS¶
- C compiler flags. 
- CFLAGS_NODIST¶
- CFLAGS_NODISTis used for building the interpreter and stdlib C extensions. Use it when a compiler flag should not be part of- CFLAGSonce Python is installed (gh-65320).- In particular, - CFLAGSshould not contain:- the compiler flag - -I(for setting the search path for include files). The- -Iflags are processed from left to right, and any flags in- CFLAGSwould take precedence over user- and package-supplied- -Iflags.
- hardening flags such as - -Werrorbecause distributions cannot control whether packages installed by users conform to such heightened standards.
 - Added in version 3.5. 
- COMPILEALL_OPTS¶
- Options passed to the - compileallcommand line when building PYC files in- make install. Default:- -j0.- Added in version 3.12. 
- EXTRA_CFLAGS¶
- Extra C compiler flags. 
- CONFIGURE_CFLAGS_NODIST¶
- Value of - CFLAGS_NODISTvariable passed to the- ./configurescript.- Added in version 3.5. 
- BASECFLAGS¶
- Base compiler flags. 
- OPT¶
- Optimization flags. 
- CFLAGS_ALIASING¶
- Strict or non-strict aliasing flags used to compile - Python/dtoa.c.- Added in version 3.7. 
- CCSHARED¶
- Compiler flags used to build a shared library. - For example, - -fPICis used on Linux and on BSD.
- CFLAGSFORSHARED¶
- Extra C flags added for building the interpreter object files. - Default: - $(CCSHARED)when- --enable-sharedis used, or an empty string otherwise.
- PY_CFLAGS¶
- Default: - $(BASECFLAGS) $(OPT) $(CONFIGURE_CFLAGS) $(CFLAGS) $(EXTRA_CFLAGS).
- PY_CFLAGS_NODIST¶
- Default: - $(CONFIGURE_CFLAGS_NODIST) $(CFLAGS_NODIST) -I$(srcdir)/Include/internal.- Added in version 3.5. 
- PY_STDMODULE_CFLAGS¶
- C flags used for building the interpreter object files. - Default: - $(PY_CFLAGS) $(PY_CFLAGS_NODIST) $(PY_CPPFLAGS) $(CFLAGSFORSHARED).- Added in version 3.7. 
- PY_CORE_CFLAGS¶
- Default: - $(PY_STDMODULE_CFLAGS) -DPy_BUILD_CORE.- Added in version 3.2. 
- PY_BUILTIN_MODULE_CFLAGS¶
- Compiler flags to build a standard library extension module as a built-in module, like the - posixmodule.- Default: - $(PY_STDMODULE_CFLAGS) -DPy_BUILD_CORE_BUILTIN.- Added in version 3.8. 
- PURIFY¶
- Purify command. Purify is a memory debugger program. - Default: empty string (not used). 
3.5.3. Linker flags¶
- LINKCC¶
- Linker command used to build programs like - pythonand- _testembed.- Default: - $(PURIFY) $(CC).
- CONFIGURE_LDFLAGS¶
- Value of - LDFLAGSvariable passed to the- ./configurescript.- Avoid assigning - CFLAGS,- LDFLAGS, etc. so users can use them on the command line to append to these values without stomping the pre-set values.- Added in version 3.2. 
- LDFLAGS_NODIST¶
- LDFLAGS_NODISTis used in the same manner as- CFLAGS_NODIST. Use it when a linker flag should not be part of- LDFLAGSonce Python is installed (gh-65320).- In particular, - LDFLAGSshould not contain:- the compiler flag - -L(for setting the search path for libraries). The- -Lflags are processed from left to right, and any flags in- LDFLAGSwould take precedence over user- and package-supplied- -Lflags.
 
- CONFIGURE_LDFLAGS_NODIST¶
- Value of - LDFLAGS_NODISTvariable passed to the- ./configurescript.- Added in version 3.8. 
- LDFLAGS¶
- Linker flags, e.g. - -Llib_dirif you have libraries in a nonstandard directory lib_dir.- Both - CPPFLAGSand- LDFLAGSneed to contain the shell’s value to be able to build extension modules using the directories specified in the environment variables.
- LIBS¶
- Linker flags to pass libraries to the linker when linking the Python executable. - Example: - -lrt.
- LDSHARED¶
- Command to build a shared library. - Default: - @LDSHARED@ $(PY_LDFLAGS).
- BLDSHARED¶
- Command to build - libpythonshared library.- Default: - @BLDSHARED@ $(PY_CORE_LDFLAGS).
- PY_LDFLAGS¶
- Default: - $(CONFIGURE_LDFLAGS) $(LDFLAGS).
- PY_LDFLAGS_NODIST¶
- Default: - $(CONFIGURE_LDFLAGS_NODIST) $(LDFLAGS_NODIST).- Added in version 3.8. 
- PY_CORE_LDFLAGS¶
- Linker flags used for building the interpreter object files. - Added in version 3.8.