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diff --git a/README.cmake b/README.cmake new file mode 100644 index 0000000..60fcc42 --- /dev/null +++ b/README.cmake @@ -0,0 +1,329 @@ +Experimental cmake-based build support for Apache httpd on Microsoft Windows + +Status +------ + +This build support is currently intended only for Microsoft Windows. + +This build support is experimental. Specifically, + +* It does not support all features of Apache httpd. +* Some components may not be built correctly and/or in a manner + compatible with the previous Windows build support. +* Build interfaces, such as the mechanisms which are used to enable + optional functionality or specify prerequisites, may change from + release to release as feedback is received from users and bugs and + limitations are resolved. + +Important: Refer to the "Known Bugs and Limitations" section for further + information. + + It is beyond the scope of this document to document or explain + how to utilize the various cmake features, such as different + build backends or provisions for finding support libraries. + + Please refer to the cmake documentation for additional information + that applies to building any project with cmake. + +Prerequisites +------------- + +The following tools must be in PATH: + +* cmake, version 2.8 or later + cmake version 3.1.3 or later is required to work with current OpenSSL + releases. (OpenSSL is an optional prerequisite of httpd.) +* Perl +* If the WITH_MODULES feature is used: awk +* If using a command-line compiler: compiler and linker and related tools + (Refer to the cmake documentation for more information.) + +The following support libraries are mandatory: + +* APR, built with cmake + + Either APR 2.0-dev (trunk) or APR 1.5.x and APR-Util 1.5.x. + + When building APR (but not APR-Util), specify the build option + APR_INSTALL_PRIVATE_H so that non-standard files required for building + Apache httpd are installed. + + Additional APR settings affect httpd but are not mandatory, such as + APR_HAVE_IPV6. +* PCRE + +Certain optional features of APR 2.0-dev (trunk) or APR-Util 1.5.x +allow some optional features of httpd to be enabled. For example, +APU_HAVE_CRYPTO is required for mod_session_crypto. + +Additional support libraries allow some optional features of httpd to be +enabled: + +* libxml2 (e.g., mod_proxy_html) +* lua 5.1 (mod_lua) +* nghttp2 (mod_http2) +* openssl (mod_ssl and https support for ab) +* zlib (mod_deflate) + +OpenSSL +------- + +If you have a binary install of OpenSSL in a well-known directory (e.g., +%HOME%\OpenSSL-Win64) and you wish to build httpd against a different +install of OpenSSL, the cmake build may unexpectedly select OpenSSL +libraries in the well-known directory even if the expected include files +are used. Check the cmake output from your httpd build to confirm that +the expected OpenSSL libraries and include files are used. + +The cmake FindOpenSSL module searches for OpenSSL libraries in a "VC" +subdirectory of the OpenSSL install with filenames that indicate the build +type (e.g., "<PREFIX>/lib/VC/ssleay32MD.lib"); defining CMAKE_PREFIX_PATH +or OPENSSL_ROOT_DIR or even OPENSSL_LIBRARIES does not circumvent finding +these libraries. + +To work around this issue, rename the well-known OpenSSL directory while +building httpd. Let us know if you find a better solution. + +nghttp2 +------- + +This is required for mod_http2. + +cmake-based build support for nghttp2 for Windows can be found at +https://github.com/trawick/nghttp2-minimal-cmake. That easily fits into +a build system that already uses cmake for httpd, apr, and perhaps other +packages. A dynamic build of nghttp2 using its normal Windows build +system should also be usable by nghttp2. + +How to build +------------ + +1. cd to a clean directory for building (i.e., don't build in your + source tree) + +2. Make sure cmake and Perl are in PATH. Additionally, some backends + require compile tools in PATH. (Hint: "Visual Studio Command Prompt") + In the unlikely event that you use -DWITH_MODULES, described below, make + sure awk is in PATH. + +3. cmake -G "some backend, like 'NMake Makefiles'" + -DCMAKE_INSTALL_PREFIX=d:/path/to/httpdinst + -DENABLE_foo=A|I|O|a|i + -DENABLE_MODULES=A|I|O|a|i + d:/path/to/httpdsource + + Alternately, you can use the cmake-gui and update settings in the GUI. + + PCRE_INCLUDE_DIR, PCRE_LIBRARIES, APR_INCLUDE_DIR, APR_LIBRARIES, + NGHTTP2_INCLUDE_DIR, NGHTTP2_LIBRARIES: + + cmake doesn't bundle FindXXX for these packages, so the crucial + information has to be specified in this manner if they aren't found + in their default location. + + -DPCRE_INCLUDE_DIR=d:/path/to/pcreinst/include + -DPCRE_LIBRARIES=d:/path/to/pcreinst/lib/pcre[d].lib + + These will have to be specified only if PCRE is installed to a different + directory than httpd, or if debug *and* release builds of PCRE were + installed there and you want to control which is used. (Currently the + build will use pcred.lib (debug) if it is found in the default location + and not overridden with -DPCRE_LIBRARIES.) + + -DAPR_INCLUDE_DIR=d:/path/to/aprinst/include + -DAPR_LIBRARIES="d:/path/to/aprinst/lib/libapr-1.lib;d:/path/to/aprinst/lib/libaprutil-1.lib" + + These will have to be specified if APR[-Util] was installed to a + different directory than httpd. + + When building with APR trunk (future APR 2.x, with integrated APR-Util), + specify just the path to libapr-2.lib: + + -DAPR_LIBRARIES=d:/path/to/aprinst/lib/libapr-2.lib + + APR+APR-Util 1.x vs. APR trunk will be detected automatically if they + are installed to the same location as httpd. + + APR-Util 1.x has an optional LDAP library. If APR-Util has LDAP enabled + and httpd's mod_ldap and mod_authnz_ldap are being used, include the + path to the LDAP library in the APR_LIBRARIES setting. (If APR and + APR-Util are found in the default location, the LDAP library will be + included if it is present. + + -DNGHTTP2_INCLUDE_DIR=d:/path/to/nghttp2inst/include (which has nghttp2/*.h) + -DNGHTTP2_LIBRARIES=d:/path/to/nghttp2inst/lib/nghttp2.lib" + + These will have to be specified if nghttp2 was installed to a different + directory than httpd. + + LIBXML2_ICONV_INCLUDE_DIR, LIBXML2_ICONV_LIBRARIES + + If using a module that requires libxml2 *and* the build of libxml2 requires + iconv, set these variables to allow iconv includes and libraries to be + used. For example: + + -DLIBXML2_ICONV_INCLUDE_DIR=c:\iconv-1.9.2.win32\include + -DLIBXML2_ICONV_LIBRARIES=c:\iconv-1.9.2.win32\lib\iconv.lib + + CMAKE_C_FLAGS_RELEASE, _DEBUG, _RELWITHDEBINFO, _MINSIZEREL + CMAKE_BUILD_TYPE + + For NMake Makefiles the choices are at least DEBUG, RELEASE, + RELWITHDEBINFO, and MINSIZEREL + Other backends may have other selections. + + ENABLE_foo: + + Each module has a default setting which can be overridden with one of + the following values: + A build and Activate module + a build and Activate module IFF prereqs are available; if + prereqs are unavailable, don't build it + I build module but leave it Inactive (commented-out + LoadModule directive) + i build module but leave it Inactive IFF prereqs are + available; if prereqs are unavailable, don't build it + O Omit module completely + + Examples: -DENABLE_ACCESS_COMPAT=O + -DENABLE_PROXY_HTML=i + + ENABLE_MODULES: + + This changes the *minimum* enablement of all modules to the specified + value (one of A, a, I, i, O, as described under ENABLE_foo above). + + The ranking of enablement from lowest to highest is O, i, I, a, A. + If a specific module has a higher rank enablement setting, either from + a built-in default or from -DENABLE_foo, ENABLE_MODULES won't affect + that module. However, if a specific module has a lower-rank enablement + setting, presumably from a built-in default, the value of ENABLE_MODULES + will be used for that module. + + Explanations for possible values: + + -DENABLE_MODULES=a build and activate all possible modules, + ignoring any with missing prereqs + (doesn't affect modules with A for ENABLE_foo) + + -DENABLE_MODULES=i build but leave inactive all possible + modules, ignoring any with missing + prereqs + (doesn't affect modules with A, a, or I for + ENABLE_foo) + + -DENABLE_MODULES=O no impact, since all modules are either + already disabled or have a higher setting + + -DENABLE_MODULES=A build and activate all possible modules, + failing the build if any module is missing + a prereq + + -DENABLE_MODULES=I similar to -DENABLE_MODULES=A + (doesn't affect modules with A or a for + ENABLE_foo) + + WITH_MODULES: + + Comma-separated paths to single file modules to statically linked into + the server, like the --with-module=modpath:/path/to/mod_foo.c with + the autoconf-based build. Key differences: The modpath (e.g., + "generators") isn't provided or used, and the copy of the module + source being built is automatically updated when it changes. + See also EXTRA_COMPILE_FLAGS, EXTRA_INCLUDES, and EXTRA_LIBS. + + EXTRA_COMPILE_FLAGS: + + Space-delimited compile flags to define with the build. + + EXTRA_INCLUDES: + + List of additional directories to search for .h files. This may + be necessary when including third-party modules in the httpd build + via WITH_MODULES. + + EXTRA_LIBS: + + List of additional libraries to link with. This may be necessary when + including third-party modules in the httpd build via WITH_MODULES. + + Port and SSLPort: + + Port numbers for substitution into default .conf files. (The defaults + are 80 and 443.) + + INSTALL_PDB: + + If .pdb files are generated for debugging, install them. + Default: ON + + The .pdb files are generally needed for debugging low-level code + problems. If they aren't installed, they are still available in the + build directory for use by alternate packaging implementations or when + debugging on the build machine. + + INSTALL_MANUAL: + + Install the Apache HTTP Server manual. + Default: ON + + This could be turned off when developing changes in order to speed up + installation time. + +4. Build using the chosen generator (e.g., "nmake install" for cmake's "NMake + Makefiles" generator). + +Running the server and support programs +--------------------------------------- + +This build system does not copy binaries such as dlls from other projects +into the httpd install location. Without taking some precautions, httpd +and support programs can fail to start or modules can fail to load because +a support library can't be found in PATH or in the directory of the httpd +binary. + +This can be resolved in several different ways: + +* Install httpd and the various support libraries to a common install + prefix so that support libraries and httpd programs are installed in + the same bin directory and are found without setting PATH. + +* Update PATH to include the bin directories of all necessary support + libraries. + + Depending on where PATH is set, it may not affect starting httpd as + a service. + +* Maintain a script which combines required binaries into a common + location, such as the httpd installion bin directory, and use that + script after building or otherwise installing or updating support + libraries. + +* AVOID THE USE of any unrepeatable process of copying dll files around + from different install locations until something starts working. The + result is that when you later update a support library to pick up a + security fix, httpd will likely continue to use the old, vulnerable + library file. + +Known Bugs and Limitations +-------------------------- + +* no standard script or makefile is provided to tie together the builds + of httpd and support libraries in a manner suitable for typical users +* no logic to find support libraries or otherwise build these modules: + + mod_socache_dc (requires distcache), mod_serf (requires serf) + + additionally, mod_firehose doesn't compile on Windows anyway +* buildmark.c isn't necessarily rebuilt when httpd.exe is regenerated +* ApacheMonitor has a build error and is disabled +* CGI examples aren't installed +* dbmmanage.pl and wintty aren't built/installed +* module enablement defaults are not in sync with the autoconf-based build +* no support for static support library builds; unclear if that is a + requirement; if so: taking PCRE as an example, we'd need to detect that it + is static and then turn on PCRE_STATIC for the libhttpd build + +Generally: + +* Many httpd features have not been tested with this build. +* Developers need to examine the existing Windows build in great detail and see + what is missing from the cmake-based build, whether a feature or some build + nuance. +* Any feedback you can provide on your experiences with this build will be + helpful. |