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INSTALL-CMAKE.md

INSTALL-CMAKE.md 21 KB
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Building with CMake

This document describes how to configure, build and install curl and libcurl from source code using the CMake build tool. To build with CMake, you of course first have to install CMake. The minimum required version of CMake is specified in the file CMakeLists.txt found in the top of the curl source tree. Once the correct version of CMake is installed you can follow the instructions below for the platform you are building on.

CMake builds can be configured either from the command line, or from one of CMake's GUIs.

Configuring

A CMake configuration of curl is similar to the autotools build of curl. It consists of the following steps after you have unpacked the source.

Using cmake

You can configure for in source tree builds or for a build tree that is apart from the source tree.

  • Build in the source tree.

    $ cmake -B .

  • Build in a separate directory (parallel to the curl source tree in this example). The build directory is created for you.

    $ cmake -B ../curl-build

Fallback for CMake before version 3.13

CMake before version 3.13 does not support the -B option. In that case, you must create the build directory yourself, cd to it and run cmake from there:

$ mkdir ../curl-build
$ cd ../curl-build
$ cmake ../curl

If you want to build in the source tree, it is enough to do this:

$ cmake .

Build system generator selection

You can override CMake's default by using -G <generator-name>. For example on Windows with multiple build systems if you have MinGW-w64 then you could use -G "MinGW Makefiles". List of generator names.

Using ccmake

CMake comes with a curses based interface called ccmake. To run ccmake on a curl use the instructions for the command line cmake, but substitute ccmake for cmake.

This brings up a curses interface with instructions on the bottom of the screen. You can press the "c" key to configure the project, and the "g" key to generate the project. After the project is generated, you can run make.

Using cmake-gui

CMake also comes with a Qt based GUI called cmake-gui. To configure with cmake-gui, you run cmake-gui and follow these steps:

  1. Fill in the "Where is the source code" combo box with the path to the curl source tree.
  2. Fill in the "Where to build the binaries" combo box with the path to the directory for your build tree, ideally this should not be the same as the source tree, but a parallel directory called curl-build or something similar.
  3. Once the source and binary directories are specified, press the "Configure" button.
  4. Select the native build tool that you want to use.
  5. At this point you can change any of the options presented in the GUI. Once you have selected all the options you want, click the "Generate" button.

Building

Build (you have to specify the build directory).

$ cmake --build ../curl-build

Static builds

The CMake build setup is primarily done to work with shared/dynamic third party dependencies. When linking with shared libraries, the dependency "chain" is handled automatically by the library loader - on all modern systems.

If you instead link with a static library, you need to provide all the dependency libraries already at the link command line.

Figuring out all the dependency libraries for a given library is hard, as it might involve figuring out the dependencies of the dependencies and they vary between platforms and can change between versions.

When using static dependencies, the build scripts mostly assume that you, the user, provide all the necessary additional dependency libraries as additional arguments in the build.

Building statically is not for the faint of heart.

Fallback for CMake before version 3.13

CMake before version 3.13 does not support the --build option. In that case, you have to cd to the build directory and use the building tool that corresponds to the build files that CMake generated for you. This example assumes that CMake generates Makefile:

$ cd ../curl-build
$ make

Testing

(The test suite does not yet work with the cmake build)

Installing

Install to default location (you have to specify the build directory).

$ cmake --install ../curl-build

Fallback for CMake before version 3.15

CMake before version 3.15 does not support the --install option. In that case, you have to cd to the build directory and use the building tool that corresponds to the build files that CMake generated for you. This example assumes that CMake generates Makefile:

$ cd ../curl-build
$ make install

CMake build options

  • BUILD_CURL_EXE: Build curl executable. Default: ON
  • BUILD_EXAMPLES: Build libcurl examples. Default: ON
  • BUILD_LIBCURL_DOCS: Build libcurl man pages. Default: ON
  • BUILD_MISC_DOCS: Build misc man pages (e.g. curl-config and mk-ca-bundle). Default: ON
  • BUILD_SHARED_LIBS: Build shared libraries. Default: ON
  • BUILD_STATIC_CURL: Build curl executable with static libcurl. Default: OFF
  • BUILD_STATIC_LIBS: Build static libraries. Default: OFF
  • BUILD_TESTING: Build tests. Default: ON
  • CURL_DEFAULT_SSL_BACKEND: Override default TLS backend in MultiSSL builds. Accepted values in order of default priority: wolfssl, gnutls, mbedtls, openssl, secure-transport, schannel, bearssl, rustls
  • CURL_ENABLE_EXPORT_TARGET: Enable CMake export target. Default: ON
  • CURL_HIDDEN_SYMBOLS: Hide libcurl internal symbols (=hide all symbols that are not officially external). Default: ON
  • CURL_LIBCURL_SOVERSION: Enable libcurl SOVERSION. Default: ON for supported platforms
  • CURL_LIBCURL_VERSIONED_SYMBOLS: Enable libcurl versioned symbols. Default: OFF
  • CURL_LIBCURL_VERSIONED_SYMBOLS_PREFIX: Override default versioned symbol prefix. Default: <TLS-BACKEND>_ or MULTISSL_
  • CURL_LTO: Enable compiler Link Time Optimizations. Default: OFF
  • CURL_STATIC_CRT: Build libcurl with static CRT with MSVC (/MT). Default: OFF
  • CURL_TARGET_WINDOWS_VERSION: Minimum target Windows version as hex string.
  • CURL_TEST_BUNDLES: Bundle libtest and unittest tests into single binaries. Default: OFF
  • CURL_WERROR: Turn compiler warnings into errors. Default: OFF
  • ENABLE_CURLDEBUG: Enable TrackMemory debug feature: Default: =ENABLE_DEBUG
  • ENABLE_CURL_MANUAL: Build the man page for curl and enable its -M/--manual option. Default: ON
  • ENABLE_DEBUG: Enable curl debug features (for developing curl itself). Default: OFF
  • IMPORT_LIB_SUFFIX: Import library suffix. Default: _imp
  • LIBCURL_OUTPUT_NAME: Basename of the curl library. Default: libcurl
  • PICKY_COMPILER: Enable picky compiler options. Default: ON
  • STATIC_LIB_SUFFIX: Static library suffix. Default: (empty)

CA bundle options

  • CURL_CA_BUNDLE: Path to the CA bundle. Set none to disable or auto for auto-detection. Default: auto
  • CURL_CA_EMBED: Path to the CA bundle to embed in the curl tool. Default: (disabled)
  • CURL_CA_FALLBACK: Use built-in CA store of TLS backend. Default: OFF
  • CURL_CA_PATH: Location of default CA path. Set none to disable or auto for auto-detection. Default: auto
  • CURL_CA_SEARCH_SAFE: Enable safe CA bundle search (within the curl tool directory) on Windows. Default: OFF

Enabling features

  • CURL_ENABLE_SSL: Enable SSL support. Default: ON
  • CURL_WINDOWS_SSPI: Enable SSPI on Windows. Default: =CURL_USE_SCHANNEL
  • ENABLE_IPV6: Enable IPv6 support. Default: ON
  • ENABLE_THREADED_RESOLVER: Enable threaded DNS lookup. Default: ON if c-ares is not enabled
  • ENABLE_UNICODE: Use the Unicode version of the Windows API functions. Default: OFF
  • ENABLE_UNIX_SOCKETS: Enable Unix domain sockets support. Default: ON
  • USE_ECH: Enable ECH support. Default: OFF
  • USE_HTTPSRR: Enable HTTPS RR support for ECH (experimental). Default: OFF
  • USE_OPENSSL_QUIC: Use OpenSSL and nghttp3 libraries for HTTP/3 support. Default: OFF

Disabling features

  • CURL_DISABLE_ALTSVC: Disable alt-svc support. Default: OFF
  • CURL_DISABLE_AWS: Disable aws-sigv4. Default: OFF
  • CURL_DISABLE_BASIC_AUTH: Disable Basic authentication. Default: OFF
  • CURL_DISABLE_BEARER_AUTH: Disable Bearer authentication. Default: OFF
  • CURL_DISABLE_BINDLOCAL: Disable local binding support. Default: OFF
  • CURL_DISABLE_CA_SEARCH: Disable unsafe CA bundle search in PATH on Windows. Default: OFF
  • CURL_DISABLE_COOKIES: Disable cookies support. Default: OFF
  • CURL_DISABLE_DICT: Disable DICT. Default: OFF
  • CURL_DISABLE_DIGEST_AUTH: Disable Digest authentication. Default: OFF
  • CURL_DISABLE_DOH: Disable DNS-over-HTTPS. Default: OFF
  • CURL_DISABLE_FILE: Disable FILE. Default: OFF
  • CURL_DISABLE_FORM_API: Disable form-api: Default: =CURL_DISABLE_MIME
  • CURL_DISABLE_FTP: Disable FTP. Default: OFF
  • CURL_DISABLE_GETOPTIONS: Disable curl_easy_options API for existing options to curl_easy_setopt. Default: OFF
  • CURL_DISABLE_GOPHER: Disable Gopher. Default: OFF
  • CURL_DISABLE_HEADERS_API: Disable headers-api support. Default: OFF
  • CURL_DISABLE_HSTS: Disable HSTS support. Default: OFF
  • CURL_DISABLE_HTTP: Disable HTTP. Default: OFF
  • CURL_DISABLE_HTTP_AUTH: Disable all HTTP authentication methods. Default: OFF
  • CURL_DISABLE_IMAP: Disable IMAP. Default: OFF
  • CURL_DISABLE_INSTALL: Disable installation targets. Default: OFF
  • CURL_DISABLE_IPFS: Disable IPFS. Default: OFF
  • CURL_DISABLE_KERBEROS_AUTH: Disable Kerberos authentication. Default: OFF
  • CURL_DISABLE_LDAP: Disable LDAP. Default: OFF
  • CURL_DISABLE_LDAPS: Disable LDAPS. Default: =CURL_DISABLE_LDAP
  • CURL_DISABLE_LIBCURL_OPTION: Disable --libcurl option from the curl tool. Default: OFF
  • CURL_DISABLE_MIME: Disable MIME support. Default: OFF
  • CURL_DISABLE_MQTT: Disable MQTT. Default: OFF
  • CURL_DISABLE_NEGOTIATE_AUTH: Disable negotiate authentication. Default: OFF
  • CURL_DISABLE_NETRC: Disable netrc parser. Default: OFF
  • CURL_DISABLE_NTLM: Disable NTLM support. Default: OFF
  • CURL_DISABLE_OPENSSL_AUTO_LOAD_CONFIG: Disable automatic loading of OpenSSL configuration. Default: OFF
  • CURL_DISABLE_PARSEDATE: Disable date parsing. Default: OFF
  • CURL_DISABLE_POP3: Disable POP3. Default: OFF
  • CURL_DISABLE_PROGRESS_METER: Disable built-in progress meter. Default: OFF
  • CURL_DISABLE_PROXY: Disable proxy support. Default: OFF
  • CURL_DISABLE_RTSP: Disable RTSP. Default: OFF
  • CURL_DISABLE_SHA512_256: Disable SHA-512/256 hash algorithm. Default: OFF
  • CURL_DISABLE_SHUFFLE_DNS: Disable shuffle DNS feature. Default: OFF
  • CURL_DISABLE_SMB: Disable SMB. Default: OFF
  • CURL_DISABLE_SMTP: Disable SMTP. Default: OFF
  • CURL_DISABLE_SOCKETPAIR: Disable use of socketpair for curl_multi_poll. Default: OFF
  • CURL_DISABLE_SRP: Disable TLS-SRP support. Default: OFF
  • CURL_DISABLE_TELNET: Disable Telnet. Default: OFF
  • CURL_DISABLE_TFTP: Disable TFTP. Default: OFF
  • CURL_DISABLE_VERBOSE_STRINGS: Disable verbose strings. Default: OFF
  • CURL_DISABLE_WEBSOCKETS: Disable WebSocket. Default: OFF
  • HTTP_ONLY: Disable all protocols except HTTP (This overrides all CURL_DISABLE_* options). Default: OFF

Environment

  • CI: Assume running under CI if set.
  • CURL_BUILDINFO: Print buildinfo.txt if set.
  • CURL_CI: Assume running under CI if set.

CMake options

  • CMAKE_DEBUG_POSTFIX: Default: -d
  • CMAKE_IMPORT_LIBRARY_SUFFIX (see CMake)
  • CMAKE_INSTALL_BINDIR (see CMake)
  • CMAKE_INSTALL_INCLUDEDIR (see CMake)
  • CMAKE_INSTALL_LIBDIR (see CMake)
  • CMAKE_INSTALL_PREFIX (see CMake)
  • CMAKE_STATIC_LIBRARY_SUFFIX (see CMake)
  • CMAKE_UNITY_BUILD_BATCH_SIZE: Set the number of sources in a "unity" unit. Default: 0 (all)
  • CMAKE_UNITY_BUILD: Enable "unity" (aka jumbo) builds. Default: OFF

Details via CMake variables and install directories.

Dependencies

  • CURL_BROTLI: Use brotli. Default: OFF
  • CURL_USE_BEARSSL: Enable BearSSL for SSL/TLS. Default: OFF
  • CURL_USE_GNUTLS: Enable GnuTLS for SSL/TLS. Default: OFF
  • CURL_USE_GSASL: Use libgsasl. Default: OFF
  • CURL_USE_GSSAPI: Use GSSAPI implementation. Default: OFF
  • CURL_USE_LIBPSL: Use libpsl. Default: ON
  • CURL_USE_LIBSSH2: Use libssh2. Default: ON
  • CURL_USE_LIBSSH: Use libssh. Default: OFF
  • CURL_USE_LIBUV: Use libuv for event-based tests. Default: OFF
  • CURL_USE_MBEDTLS: Enable mbedTLS for SSL/TLS. Default: OFF
  • CURL_USE_OPENSSL: Enable OpenSSL for SSL/TLS. Default: ON if no other TLS backend was enabled.
  • CURL_USE_PKGCONFIG: Enable pkg-config to detect dependencies. Default: ON for Unix, vcpkg, MinGW if not cross-compiling.
  • CURL_USE_RUSTLS: Enable Rustls for SSL/TLS. Default: OFF
  • CURL_USE_SCHANNEL: Enable Windows native SSL/TLS (Schannel). Default: OFF
  • CURL_USE_SECTRANSP: Enable Apple OS native SSL/TLS (Secure Transport). Default: OFF
  • CURL_USE_WOLFSSH: Use wolfSSH. Default: OFF
  • CURL_USE_WOLFSSL: Enable wolfSSL for SSL/TLS. Default: OFF
  • CURL_ZLIB: Use zlib (ON, OFF or AUTO). Default: AUTO
  • CURL_ZSTD: Use zstd. Default: OFF
  • ENABLE_ARES: Enable c-ares support. Default: OFF
  • USE_APPLE_IDN: Use Apple built-in IDN support. Default: OFF
  • USE_LIBIDN2: Use libidn2 for IDN support. Default: ON
  • USE_LIBRTMP: Enable librtmp from rtmpdump. Default: OFF
  • USE_MSH3: Use msh3/msquic library for HTTP/3 support. Default: OFF
  • USE_NGHTTP2: Use nghttp2 library. Default: ON
  • USE_NGTCP2: Use ngtcp2 and nghttp3 libraries for HTTP/3 support. Default: OFF
  • USE_QUICHE: Use quiche library for HTTP/3 support. Default: OFF
  • USE_WIN32_IDN: Use WinIDN for IDN support. Default: OFF
  • USE_WIN32_LDAP: Use Windows LDAP implementation. Default: ON

Dependency options (via CMake)

  • OPENSSL_ROOT_DIR: Set this variable to the root installation of OpenSSL (and forks).
  • ZLIB_INCLUDE_DIR: The zlib include directory.
  • ZLIB_LIBRARY: Path to zlib library.

Dependency options

  • PERL_EXECUTABLE Perl binary used throughout the build and tests.
  • BEARSSL_INCLUDE_DIR: The BearSSL include directory.
  • BEARSSL_LIBRARY: Path to bearssl library.
  • BROTLI_INCLUDE_DIR: The brotli include directory.
  • BROTLICOMMON_LIBRARY: Path to brotlicommon library.
  • BROTLIDEC_LIBRARY: Path to brotlidec library.
  • CARES_INCLUDE_DIR: The c-ares include directory.
  • CARES_LIBRARY: Path to cares library.
  • GSS_ROOT_DIR: Set this variable to the root installation of GSS. (also supported as environment)
  • LDAP_LIBRARY: Name or full path to ldap library. Default: ldap
  • LDAP_LBER_LIBRARY: Name or full path to lber library. Default: lber
  • LDAP_INCLUDE_DIR: Path to LDAP include directory.
  • LIBGSASL_INCLUDE_DIR: The libgsasl include directory.
  • LIBGSASL_LIBRARY: Path to libgsasl library.
  • LIBIDN2_INCLUDE_DIR: The libidn2 include directory.
  • LIBIDN2_LIBRARY: Path to libidn2 library.
  • LIBPSL_INCLUDE_DIR: The libpsl include directory.
  • LIBPSL_LIBRARY: Path to libpsl library.
  • LIBSSH_INCLUDE_DIR: The libssh include directory.
  • LIBSSH_LIBRARY: Path to libssh library.
  • LIBSSH2_INCLUDE_DIR: The libssh2 include directory.
  • LIBSSH2_LIBRARY: Path to libssh2 library.
  • LIBUV_INCLUDE_DIR: The libuv include directory.
  • LIBUV_LIBRARY: Path to libuv library.
  • MSH3_INCLUDE_DIR: The msh3 include directory.
  • MSH3_LIBRARY: Path to msh3 library.
  • MBEDTLS_INCLUDE_DIR: The mbedTLS include directory.
  • MBEDTLS_LIBRARY: Path to mbedtls library.
  • MBEDX509_LIBRARY: Path to mbedx509 library.
  • MBEDCRYPTO_LIBRARY: Path to mbedcrypto library.
  • NGHTTP2_INCLUDE_DIR: The nghttp2 include directory.
  • NGHTTP2_LIBRARY: Path to nghttp2 library.
  • NGHTTP3_INCLUDE_DIR: The nghttp3 include directory.
  • NGHTTP3_LIBRARY: Path to nghttp3 library.
  • NGTCP2_INCLUDE_DIR: The ngtcp2 include directory.
  • NGTCP2_LIBRARY: Path to ngtcp2 library.
  • NETTLE_INCLUDE_DIR: The nettle include directory.
  • NETTLE_LIBRARY: Path to nettle library.
  • QUICHE_INCLUDE_DIR: The quiche include directory.
  • QUICHE_LIBRARY: Path to quiche library.
  • RUSTLS_INCLUDE_DIR: The Rustls include directory.
  • RUSTLS_LIBRARY: Path to rustls library.
  • WOLFSSH_INCLUDE_DIR: The wolfSSH include directory.
  • WOLFSSH_LIBRARY: Path to wolfssh library.
  • WOLFSSL_INCLUDE_DIR: The wolfSSL include directory.
  • WOLFSSL_LIBRARY: Path to wolfssl library.
  • ZSTD_INCLUDE_DIR: The zstd include directory.
  • ZSTD_LIBRARY: Path to zstd library.

Test tools

  • APACHECTL: Default: apache2ctl
  • APXS: Default: apxs
  • CADDY: Default: caddy
  • HTTPD_NGHTTPX: Default: nghttpx
  • HTTPD: Default: apache2
  • TEST_NGHTTPX: Default: nghttpx
  • VSFTPD: Default: vsftps