.. _building: Building The Library ================================= This document describes how to build Botan on Unix/POSIX and Windows systems. The POSIX oriented descriptions should apply to most common Unix systems (including OS X), along with POSIX-ish systems like BeOS, QNX, and Plan 9. Currently, systems other than Windows and POSIX (such as VMS, MacOS 9, OS/390, OS/400, ...) are not supported by the build system, primarily due to lack of access. Please contact the maintainer if you would like to build Botan on such a system. Botan's build is controlled by configure.py, which is a `Python `_ script. Python 2.6 or later is required. .. highlight:: none For the impatient, this works for most systems:: $ ./configure.py [--prefix=/some/directory] $ make $ make install Or using ``nmake``, if you're compiling on Windows with Visual C++. On platforms that do not understand the '#!' convention for beginning script files, or that have Python installed in an unusual spot, you might need to prefix the ``configure.py`` command with ``python`` or ``/path/to/python``:: $ python ./configure.py [arguments] Configuring the Build --------------------------------- The first step is to run ``configure.py``, which is a Python script that creates various directories, config files, and a Makefile for building everything. This script should run under a vanilla install of Python 2.6, 2.7, or 3.x. The script will attempt to guess what kind of system you are trying to compile for (and will print messages telling you what it guessed). You can override this process by passing the options ``--cc``, ``--os``, and ``--cpu``. You can pass basically anything reasonable with ``--cpu``: the script knows about a large number of different architectures, their sub-models, and common aliases for them. You should only select the 64-bit version of a CPU (such as "sparc64" or "mips64") if your operating system knows how to handle 64-bit object code - a 32-bit kernel on a 64-bit CPU will generally not like 64-bit code. By default the script tries to figure out what will work on your system, and use that. It will print a display at the end showing which algorithms have and have not been enabled. For instance on one system we might see lines like:: INFO: Skipping (dependency failure): certstor_sqlite3 sessions_sqlite3 INFO: Skipping (incompatible CPU): aes_power8 INFO: Skipping (incompatible OS): darwin_secrandom getentropy win32_stats INFO: Skipping (incompatible compiler): aes_armv8 pmull sha1_armv8 sha2_32_armv8 INFO: Skipping (no enabled compression schemes): compression INFO: Skipping (requires external dependency): boost bzip2 lzma openssl sqlite3 tpm zlib The ones that are skipped because they are require an external dependency have to be explicitly asked for, because they rely on third party libraries which your system might not have or that you might not want the resulting binary to depend on. For instance to enable zlib support, add ``--with-zlib`` to your invocation of ``configure.py``. All available modules can be listed with ``--list-modules``. You can control which algorithms and modules are built using the options ``--enable-modules=MODS`` and ``--disable-modules=MODS``, for instance ``--enable-modules=zlib`` and ``--disable-modules=xtea,idea``. Modules not listed on the command line will simply be loaded if needed or if configured to load by default. If you use ``--minimized-build``, only the most core modules will be included; you can then explicitly enable things that you want to use with ``--enable-modules``. This is useful for creating a minimal build targeting to a specific application, especially in conjunction with the amalgamation option; see :ref:`amalgamation` and :ref:`minimized_builds`. For instance:: $ ./configure.py --minimized-build --enable-modules=rsa,eme_oaep,emsa_pssr will set up a build that only includes RSA, OAEP, PSS along with any required dependencies. Note that a minimized build does not by default include any random number generator, which is needed for example to generate keys, nonces and IVs. See :doc:`api_ref/rng` on which random number generators are available. Cross Compiling --------------------- Cross compiling refers to building software on one type of host (say Linux x86-64) but creating a binary for some other type (say MinGW x86-32). This is completely supported by the build system. To extend the example, we must tell `configure.py` to use the MinGW tools:: $ ./configure.py --os=mingw --cpu=x86_32 --cc-bin=i686-w64-mingw32-g++ --ar-command=i686-w64-mingw32-ar ... $ make ... $ file botan.exe botan.exe: PE32 executable (console) Intel 80386, for MS Windows .. note:: For whatever reason, some distributions of MinGW lack support for threading or mutexes in the C++ standard library. You can work around this by disabling thread support using ``--without-os-feature=threads`` You can also specify the alternate tools by setting the `CXX` and `AR` environment variables (instead of the `--cc-bin` and `--ar-command` options), as is commonly done with autoconf builds. On Unix ---------------- The basic build procedure on Unix and Unix-like systems is:: $ ./configure.py [--enable-modules=] [--cc=CC] $ make $ make check If the tests look OK, install:: $ make install On Unix systems the script will default to using GCC; use ``--cc`` if you want something else. For instance use ``--cc=icc`` for Intel C++ and ``--cc=clang`` for Clang. The ``make install`` target has a default directory in which it will install Botan (typically ``/usr/local``). You can override this by using the ``--prefix`` argument to ``configure.py``, like so:: $ ./configure.py --prefix=/opt On some systems shared libraries might not be immediately visible to the runtime linker. For example, on Linux you may have to edit ``/etc/ld.so.conf`` and run ``ldconfig`` (as root) in order for new shared libraries to be picked up by the linker. An alternative is to set your ``LD_LIBRARY_PATH`` shell variable to include the directory that the Botan libraries were installed into. On macOS -------------- A build on macOS works much like that on any other Unix-like system. To build a universal binary for macOS, you need to set some additional build flags. Do this with the `configure.py` flag `--cc-abi-flags`:: --cc-abi-flags="-force_cpusubtype_ALL -mmacosx-version-min=10.4 -arch i386 -arch ppc" On Windows -------------- .. note:: The earliest versions of Windows supported are Windows 7 and Windows 2008 R2 You need to have a copy of Python installed, and have both Python and your chosen compiler in your path. Open a command shell (or the SDK shell), and run:: $ python configure.py --cc=msvc --os=windows $ nmake $ nmake check $ nmake install Botan supports the nmake replacement `Jom `_ which enables you to run multiple build jobs in parallel. For MinGW, use:: $ python configure.py --cc=gcc --os=mingw $ make By default the install target will be ``C:\botan``; you can modify this with the ``--prefix`` option. When building your applications, all you have to do is tell the compiler to look for both include files and library files in ``C:\botan``, and it will find both. Or you can move them to a place where they will be in the default compiler search paths (consult your documentation and/or local expert for details). For iOS using XCode ------------------------- For iOS, you typically build for 3 architectures: armv7 (32 bit, older iOS devices), armv8-a (64 bit, recent iOS devices) and x86_64 for the iPhone simulator. You can build for these 3 architectures and then create a universal binary containing code for all of these architectures, so you can link to Botan for the simulator as well as for an iOS device. To cross compile for armv7, configure and make with:: $ ./configure.py --os=ios --prefix="iphone-32" --cpu=armv7 --cc=clang \ --cc-abi-flags="-arch armv7" $ xcrun --sdk iphoneos make install To cross compile for armv8-a, configure and make with:: $ ./configure.py --os=ios --prefix="iphone-64" --cpu=armv8-a --cc=clang \ --cc-abi-flags="-arch arm64" $ xcrun --sdk iphoneos make install To compile for the iPhone Simulator, configure and make with:: $ ./configure.py --os=ios --prefix="iphone-simulator" --cpu=x86_64 --cc=clang \ --cc-abi-flags="-arch x86_64" $ xcrun --sdk iphonesimulator make install Now create the universal binary and confirm the library is compiled for all three architectures:: $ xcrun --sdk iphoneos lipo -create -output libbotan-2.a \ iphone-32/lib/libbotan-2.a \ iphone-64/lib/libbotan-2.a \ iphone-simulator/lib/libbotan-2.a $ xcrun --sdk iphoneos lipo -info libbotan-2.a Architectures in the fat file: libbotan-2.a are: armv7 x86_64 armv64 The resulting static library can be linked to your app in Xcode. For Android --------------------- Modern versions of Android NDK use Clang and support C++11. Simply configure using the appropriate NDK compiler:: $ export CXX=/opt/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang++ $ ./configure.py --os=android --cc=clang --cpu=arm64 Docker ^^^^^^^^^^^ To build android version, there is the possibility to use the docker way:: sudo ANDROID_SDK_VER=21 ANDROID_ARCH=arm64 src/scripts/docker-android.sh This will produce the docker-builds/android folder containing each architecture compiled. Emscripten (WebAssembly) --------------------------- To build for WebAssembly using Emscripten, try:: CXX=em++ ./configure.py --cc=clang --cpu=llvm --os=emscripten make This will produce bitcode files ``botan-test.bc`` and ``botan.bc`` along with a static archive ``libbotan-2.a`` which can linked with other modules. To convert the tests into a WASM file which can be executed on a browser, use:: em++ -s ALLOW_MEMORY_GROWTH=1 -s DISABLE_EXCEPTION_CATCHING=0 -s WASM=1 \ --preload-file src/tests/data botan-test.bc -o botan-test.html Supporting Older Distros -------------------------- Some "stable" distributions, notably RHEL/CentOS, ship very obsolete versions of binutils, which do not support more recent CPU instructions. As a result when building you may receive errors like:: Error: no such instruction: `sha256rnds2 %xmm0,%xmm4,%xmm3' Depending on how old your binutils is, you may need to disable BMI2, AVX2, SHA-NI, and/or RDSEED. These can be disabled by passing the flags ``--disable-bmi2``, ``--disable-avx2``, ``--disable-sha-ni``, and ``--disable-rdseed`` to ``configure.py``. Other Build-Related Tasks ---------------------------------------- .. _building_docs: Building The Documentation ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ There are two documentation options available, Sphinx and Doxygen. Sphinx will be used if ``sphinx-build`` is detected in the PATH, or if ``--with-sphinx`` is used at configure time. Doxygen is only enabled if ``--with-doxygen`` is used. Both are generated by the makefile target ``docs``. .. _amalgamation: The Amalgamation Build ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ You can also configure Botan to be built using only a single source file; this is quite convenient if you plan to embed the library into another application. To generate the amalgamation, run ``configure.py`` with whatever options you would ordinarily use, along with the option ``--amalgamation``. This will create two (rather large) files, ``botan_all.h`` and ``botan_all.cpp``. .. note:: The library will as usual be configured to target some specific operating system and CPU architecture. You can use the CPU target "generic" if you need to target multiple CPU architectures, but this has the effect of disabling *all* CPU specific features such as SIMD, AES instruction sets, or inline assembly. If you need to ship amalgamations for multiple targets, it would be better to create different amalgamation files for each individual target. Whenever you would have included a botan header, you can then include ``botan_all.h``, and include ``botan_all.cpp`` along with the rest of the source files in your build. If you want to be able to easily switch between amalgamated and non-amalgamated versions (for instance to take advantage of prepackaged versions of botan on operating systems that support it), you can instead ignore ``botan_all.h`` and use the headers from ``build/include`` as normal. You can also build the library using Botan's build system (as normal) but utilizing the amalgamation instead of the individual source files by running something like ``./configure.py --amalgamation && make``. This is essentially a very simple form of link time optimization; because the entire library source is visible to the compiler, it has more opportunities for interprocedural optimizations. Additionally (assuming you are not making use of a compiler cache such as ``ccache`` or ``sccache``) amalgamation builds usually have significantly shorter compile times for full rebuilds. Modules Relying on Third Party Libraries ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Currently ``configure.py`` cannot detect if external libraries are available, so using them is controlled explicitly at build time by the user using - ``--with-bzip2`` enables the filters providing bzip2 compression and decompression. Requires the bzip2 development libraries to be installed. - ``--with-zlib`` enables the filters providing zlib compression and decompression. Requires the zlib development libraries to be installed. - ``--with-lzma`` enables the filters providing lzma compression and decompression. Requires the lzma development libraries to be installed. - ``--with-sqlite3`` enables using sqlite3 databases in various contexts (TLS session cache, PSK database, etc). - ``--with-openssl`` adds an engine that uses OpenSSL for some ciphers, hashes, and public key operations. OpenSSL 1.0.2 or later is supported. LibreSSL can also be used. - ``--with-tpm`` adds support for using TPM hardware via the TrouSerS library. - ``--with-boost`` enables using some Boost libraries. In particular Boost.Filesystem is used for a few operations (but on most platforms, a native API equivalent is available), and Boost.Asio is used to provide a few extra TLS related command line utilities. Multiple Builds ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ It may be useful to run multiple builds with different configurations. Specify ``--with-build-dir=`` to set up a build environment in a different directory. Setting Distribution Info ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The build allows you to set some information about what distribution this build of the library comes from. It is particularly relevant to people packaging the library for wider distribution, to signify what distribution this build is from. Applications can test this value by checking the string value of the macro ``BOTAN_DISTRIBUTION_INFO``. It can be set using the ``--distribution-info`` flag to ``configure.py``, and otherwise defaults to "unspecified". For instance, a `Gentoo `_ ebuild might set it with ``--distribution-info="Gentoo ${PVR}"`` where ``${PVR}`` is an ebuild variable automatically set to a combination of the library and ebuild versions. Local Configuration Settings ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ You may want to do something peculiar with the configuration; to support this there is a flag to ``configure.py`` called ``--with-local-config=``. The contents of the file are inserted into ``build/build.h`` which is (indirectly) included into every Botan header and source file. Enabling or Disabling Use of Certain OS Features ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Botan uses compile-time flags to enable or disable use of certain operating specific functions. You can also override these at build time if desired. The default feature flags are given in the files in ``src/build-data/os`` in the ``target_features`` block. For example Linux defines flags like ``proc_fs``, ``getauxval``, and ``sockets``. The ``configure.py`` option ``--list-os-features`` will display all the feature flags for all operating system targets. To disable a default-enabled flag, use ``--without-os-feature=feat1,feat2,...`` To enable a flag that isn't otherwise enabled, use ``--with-os-feature=feat``. For example, modern Linux systems support the ``getentropy`` call, but it is not enabled by default because many older systems lack it. However if you know you will only deploy to recently updated systems you can use ``--with-os-feature=getentropy`` to enable it. A special case if dynamic loading, which applications for certain environments will want to disable. There is no specific feature flag for this, but ``--disable-modules=dyn_load`` will prevent it from being used. .. note:: Disabling ``dyn_load`` module will also disable the PKCS #11 wrapper, which relies on dynamic loading. Configuration Parameters ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ There are some configuration parameters which you may want to tweak before building the library. These can be found in ``build.h``. This file is overwritten every time the configure script is run (and does not exist until after you run the script for the first time). Also included in ``build/build.h`` are macros which let applications check which features are included in the current version of the library. All of them begin with ``BOTAN_HAS_``. For example, if ``BOTAN_HAS_RSA`` is defined, then an application knows that this version of the library has RSA available. ``BOTAN_MP_WORD_BITS``: This macro controls the size of the words used for calculations with the MPI implementation in Botan. It must be set to either 32 or 64 bits. The default is chosen based on the target processor. There is normally no reason to change this. ``BOTAN_DEFAULT_BUFFER_SIZE``: This constant is used as the size of buffers throughout Botan. The default should be fine for most purposes, reduce if you are very concerned about runtime memory usage. Building Applications ---------------------------------------- Unix ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Botan usually links in several different system libraries (such as ``librt`` or ``libz``), depending on which modules are configured at compile time. In many environments, particularly ones using static libraries, an application has to link against the same libraries as Botan for the linking step to succeed. But how does it figure out what libraries it *is* linked against? The answer is to ask the ``botan`` command line tool using the ``config`` and ``version`` commands. ``botan version``: Print the Botan version number. ``botan config prefix``: If no argument, print the prefix where Botan is installed (such as ``/opt`` or ``/usr/local``). ``botan config cflags``: Print options that should be passed to the compiler whenever a C++ file is compiled. Typically this is used for setting include paths. ``botan config libs``: Print options for which libraries to link to (this will include a reference to the botan library itself). Your ``Makefile`` can run ``botan config`` and get the options necessary for getting your application to compile and link, regardless of whatever crazy libraries Botan might be linked against. Windows ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ No special help exists for building applications on Windows. However, given that typically Windows software is distributed as binaries, this is less of a problem - only the developer needs to worry about it. As long as they can remember where they installed Botan, they just have to set the appropriate flags in their Makefile/project file. Language Wrappers ---------------------------------------- Building the Python wrappers ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The Python wrappers for Botan use ctypes and the C89 API so no special build step is required, just import botan2.py See :doc:`Python Bindings ` for more information about the Python bindings. .. _minimized_builds: Minimized Builds -------------------- Many developers wish to configure a minimized build which contains only the specific features their application will use. In general this is straighforward: use ``--minimized-build`` plus ``--enable-modules=`` to enable the specific modules you wish to use. Any such configurations should build and pass the tests; if you encounter a case where it doesn't please file an issue. The only trick is knowing which features you want to enable. The most common difficulty comes with entropy sources. By default, none are enabled, which means if you attempt to use ``AutoSeeded_RNG``, it will fail. The easiest resolution is to also enable ``system_rng`` which can act as either an entropy source or used directly as the RNG. If you are building for x86, ARM, or POWER, it can be beneficial to enable hardware support for the relevant instruction sets with modules such as ``aes_ni`` and ``clmul`` for x86, or ``aes_armv8``, ``pmull``, and ``sha2_32_armv8`` on ARMv8. SIMD optimizations such as ``chacha_avx2`` also can provide substantial performance improvements. .. note:: In a future release, hardware specific modules will be enabled by default if the underlying "base" module is enabled. If you are building a TLS application, you may (or may not) want to include ``tls_cbc`` which enables support for CBC ciphersuites. If ``tls_cbc`` is disabled, then it will not be possible to negotiate TLS v1.0/v1.1. In general this should be considered a feature; only enable this if you need backward compatability with obsolete clients or servers. For TLS another useful feature which is not enabled by default is the ChaCha20Poly1305 ciphersuites. To enable these, add ``chacha20poly1305``. Configure Script Options --------------------------- ``--cpu=CPU`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the target CPU architecture. If not used, the arch of the current system is detected (using Python's platform module) and used. ``--os=OS`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the target operating system. ``--cc=COMPILER`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the desired build compiler ``--cc-min-version=MAJOR.MINOR`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the minimal version of the target compiler. Use --cc-min-version=0.0 to support all compiler versions. Default is auto detection. ``--cc-bin=BINARY`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set path to compiler binary ``--cc-abi-flags=FLAGS`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set ABI flags, which for the purposes of this option mean options which should be passed to both the compiler and linker. ``--cxxflags=FLAGS`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Override all compiler flags. This is equivalent to setting ``CXXFLAGS`` in the environment. ``--extra-cxxflags=FLAGS`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set extra compiler flags, which are appended to the default set. This is useful if you want to set just one or two additional options but leave the normal logic for selecting flags alone. ``--ldflags=FLAGS`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set flags to pass to the linker. This is equivalent to setting ``LDFLAGS`` ``--ar-command=AR`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the path to the tool to use to create static archives (``ar``). This is normally only used for cross-compilation. ``--ar-options=AR_OPTIONS`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify the options to pass to ``ar``. ``--msvc-runtime=RT`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify the MSVC runtime to use (MT, MD, MTd, or MDd). If not specified, picks either MD or MDd depending on if debug mode is set. ``--with-endian=ORDER`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The parameter should be either "little" or "big". If not used then if the target architecture has a default, that is used. Otherwise left unspecified, which causes less optimal codepaths to be used but will work on either little or big endian. ``--with-os-features=FEAT`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify an OS feature to enable. See ``src/build-data/os`` and ``doc/os.rst`` for more information. ``--without-os-features=FEAT`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify an OS feature to disable. ``--disable-sse2`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of SSE2 intrinsics ``--disable-ssse3`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of SSSE3 intrinsics ``--disable-sse4.1`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of SSE4.1 intrinsics ``--disable-sse4.2`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of SSE4.2 intrinsics ``--disable-avx2`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of AVX2 intrinsics ``--disable-bmi2`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of BMI2 intrinsics ``--disable-rdrand`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of RDRAND intrinsics ``--disable-rdseed`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of RDSEED intrinsics ``--disable-aes-ni`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of AES-NI intrinsics ``--disable-sha-ni`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of SHA-NI intrinsics ``--disable-altivec`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of AltiVec intrinsics ``--disable-neon`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of NEON intrinsics ``--disable-armv8crypto`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable use of ARMv8Crypto intrinsics ``--with-debug-info`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Include debug symbols. ``--with-sanitizers`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable some default set of sanitizer checks. What exactly is enabled depends on the compiler. ``--enable-sanitizers=SAN`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable specific sanitizers. See ``src/build-data/cc`` for more information. ``--without-stack-protector`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable stack smashing protections. **not recommended** ``--with-coverage`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Add coverage info and disable optimizations ``--with-coverage-info`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Add coverage info, but leave optimizations alone ``--disable-shared-library`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable building a shared library ``--disable-static-library`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable building static library ``--optimize-for-size`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Optimize for code size. ``--no-optimizations`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable all optimizations for debugging. ``--debug-mode`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable debug info and disable optimizations ``--amalgamation`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use amalgamation to build ``--system-cert-bundle`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set a path to a file containing one or more trusted CA certificates in PEM format. If not given, some default locations are checked. ``--with-build-dir=DIR`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Setup the build in a specified directory instead of ``./build`` ``--with-external-includedir=DIR`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Search for includes in this directory. Provide this parameter multiple times to define multiple additional include directories. ``--with-external-libdir=DIR`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Add DIR to the link path. Provide this parameter multiple times to define multiple additional library link directories. ``--define-build-macro`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set a compile-time pre-processor definition (i.e. add a -D... to the compiler invocations). Provide this parameter multiple times to add multiple compile-time definitions. Both KEY=VALUE and KEY (without specific value) are supported. ``--with-sysroot-dir=DIR`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use specified dir for system root while cross-compiling ``--with-openmp`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable use of OpenMP ``--link-method=METHOD`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ During build setup a directory linking to each header file is created. Choose how the links are performed (options are "symlink", "hardlink", or "copy"). ``--with-local-config=FILE`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Include the contents of FILE into the generated build.h ``--distribution-info=STRING`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set distribution specific version information ``--maintainer-mode`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ A build configuration used by library developers, which enables extra warnings and turns most warnings into errors. .. warning:: When this option is used, all relevant warnings available in the most recent release of GCC/Clang are enabled, so it may fail to build if your compiler is not sufficiently recent. In addition there may be non-default configurations or unusual platforms which cause warnings which are converted to errors. Patches addressing such warnings are welcome, but otherwise no support is available when using this option. ``--with-python-versions=N.M`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Where to install botan2.py. By default this is chosen to be the version of Python that is running ``configure.py``. ``--with-valgrind`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use valgrind API to perform additional checks. Not needed by end users. ``--unsafe-fuzzer-mode`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable essential checks for testing. **UNSAFE FOR PRODUCTION** ``--build-fuzzers=TYPE`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Select which interface the fuzzer uses. Options are "afl", "libfuzzer", "klee", or "test". The "test" mode builds fuzzers that read one input from stdin and then exit. ``--with-fuzzer-lib=LIB`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify an additional library that fuzzer binaries must link with. ``--boost-library-name`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Provide an alternative name for a boost library. Depending on the platform and boost's build configuration these library names differ significantly (see `Boost docs `_). The provided library name must be suitable as identifier in a linker parameter, e.g on unix: ``boost_system`` or windows: ``libboost_regex-vc71-x86-1_70``. ``--without-documentation`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Skip building/installing documentation ``--with-sphinx`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use Sphinx to generate the handbook ``--with-pdf`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use Sphinx to generate PDF doc ``--with-rst2man`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use rst2man to generate a man page for the CLI ``--with-doxygen`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use Doxygen to generate API reference ``--module-policy=POL`` ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The option ``--module-policy=POL`` enables modules required by and disables modules prohibited by a text policy in ``src/build-data/policy``. Additional modules can be enabled if not prohibited by the policy. Currently available policies include ``bsi``, ``nist`` and ``modern``:: $ ./configure.py --module-policy=bsi --enable-modules=tls,xts --enable-modules=MODS ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable some specific modules --disable-modules=MODS ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Disable some specific modules --minimized-build ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Start with the bare minimum. This is mostly useful in conjuction with `--enable-modules`` to get a build that has just the features a particular application requires. --with-boost ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use Boost.Asio for networking support. This primarily affects the command line utils. --with-bzip2 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable bzip2 compression --with-lzma ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable lzma compression --with-zlib ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable using zlib compression --with-openssl ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable using OpenSSL for certain operations --with-commoncrypto ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable using CommonCrypto for certain operations --with-sqlite3 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable using sqlite3 for data storage --with-tpm ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Enable support for TPM --program-suffix=SUFFIX ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ A string to append to all program binaries. --library-suffix=SUFFIX ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ A string to append to all library names. --prefix=DIR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the install prefix. --docdir=DIR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the documentation installation dir. --bindir=DIR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the binary installation dir. --libdir=DIR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the library installation dir. --mandir=DIR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the man page installation dir. --includedir=DIR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Set the include file installation dir.