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Bringing Cmake back (#470)

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* Revert "Removed CMakeLists.txt. (Fix #421)"

This reverts commit 8674555b88.

* Fail if cmake version too old

Previous behaviour is just a warning.

* Improve CMakeLists

Adds automatic dependency finding (if they were used).
Adds a way to require a specific version in the find_package(httplib) call.

You should link against the httplib::httplib IMPORTED target, which is
created automatically.

Add options to allow for strictly requiring OpenSSL/ZLIB

HTTPLIB_REQUIRE_OPENSSL & HTTPLIB_REQUIRE_ZLIB require the libs be found, or the build fails.

HTTPLIB_USE_OPENSSL_IF_AVAILABLE & HTTPLIB_USE_ZLIB_IF_AVAILABLE silently search for the libs.
If they aren't found, the build still continues, but shuts off support for those features.

* Add documentation to CMakeLists.txt

Has info on all the available options and what targets are produced.

Also put some things about installation on certain platforms.
This commit is contained in:
KTGH 2020-05-19 19:07:18 -04:00 committed by GitHub
parent 29fd136afd
commit 9505a76491
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CMakeLists.txt Normal file
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#[[
Build options:
* HTTPLIB_USE_OPENSSL_IF_AVAILABLE (default on)
* HTTPLIB_USE_ZLIB_IF_AVAILABLE (default on)
* HTTPLIB_REQUIRE_OPENSSL (default off)
* HTTPLIB_REQUIRE_ZLIB (default off)
After installation with Cmake, a find_package(httplib) is available.
This creates a httplib::httplib target (if found).
It can be linked like so:
target_link_libraries(your_exe httplib::httplib)
The following will build & install for later use.
Linux/macOS:
mkdir -p build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
sudo cmake --build . --target install
Windows:
mkdir build
cd build
cmake ..
runas /user:Administrator "cmake --build . --config Release --target install"
These three variables are available after you run find_package(httplib)
* HTTPLIB_HEADER_PATH - this is the full path to the installed header.
* HTTPLIB_IS_USING_OPENSSL - a bool for if OpenSSL support is enabled.
* HTTPLIB_IS_USING_ZLIB - a bool for if ZLIB support is enabled.
Want to use precompiled headers (Cmake feature since v3.16)?
It's as simple as doing the following (before linking):
target_precompile_headers(httplib::httplib INTERFACE "${HTTPLIB_HEADER_PATH}")
]]
cmake_minimum_required(VERSION 3.7.0 FATAL_ERROR)
project(httplib LANGUAGES CXX)
# Change as needed to set an OpenSSL minimum version.
# This is used in the installed Cmake config file.
set(_HTTPLIB_OPENSSL_MIN_VER "1.1.1")
# Allow for a build to require OpenSSL to pass, instead of just being optional
option(HTTPLIB_REQUIRE_OPENSSL "Requires OpenSSL to be found & linked, or fails build." OFF)
option(HTTPLIB_REQUIRE_ZLIB "Requires ZLIB to be found & linked, or fails build." OFF)
# Allow for a build to casually enable OpenSSL/ZLIB support, but silenty continue if not found.
# Make these options so their automatic use can be specifically disabled (as needed)
option(HTTPLIB_USE_OPENSSL_IF_AVAILABLE "Uses OpenSSL (if available) to enable HTTPS support." ON)
option(HTTPLIB_USE_ZLIB_IF_AVAILABLE "Uses ZLIB (if available) to enable compression support." ON)
# TODO: implement the option of option to correctly split, building, and export with the split.py script.
# option(HTTPLIB_SPLIT "Uses a Python script to split the header into a header & source file." OFF)
# Threads needed for <thread> on some systems, and for <pthread.h> on Linux
find_package(Threads REQUIRED)
if(HTTPLIB_REQUIRE_OPENSSL)
find_package(OpenSSL ${_HTTPLIB_OPENSSL_MIN_VER} REQUIRED)
elseif(HTTPLIB_USE_OPENSSL_IF_AVAILABLE)
# Look quietly since it's optional are optional
find_package(OpenSSL ${_HTTPLIB_OPENSSL_MIN_VER} QUIET)
endif()
if(HTTPLIB_REQUIRE_ZLIB)
find_package(ZLIB REQUIRED)
elseif(HTTPLIB_USE_ZLIB_IF_AVAILABLE)
find_package(ZLIB QUIET)
endif()
# Used for default, common dirs that the end-user can change (if needed)
# like CMAKE_INSTALL_INCLUDEDIR or CMAKE_INSTALL_DATADIR
include(GNUInstallDirs)
add_library(${PROJECT_NAME} INTERFACE)
# Lets you address the target with httplib::httplib
# Only useful if building in-tree, versus using it from an installation.
add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
# Might be missing some, but this list is somewhat comprehensive
target_compile_features(${PROJECT_NAME} INTERFACE
cxx_std_11
cxx_nullptr
cxx_noexcept
cxx_lambdas
cxx_override
cxx_defaulted_functions
cxx_attribute_deprecated
cxx_auto_type
cxx_decltype
cxx_deleted_functions
cxx_range_for
cxx_sizeof_member
)
target_include_directories(${PROJECT_NAME} INTERFACE
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
target_link_libraries(${PROJECT_NAME} INTERFACE
# Always require threads
Threads::Threads
# Only link zlib & openssl if they're found
$<$<BOOL:${ZLIB_FOUND}>:ZLIB::ZLIB>
$<$<BOOL:${OPENSSL_FOUND}>:OpenSSL::SSL OpenSSL::Crypto>
)
# Auto-define the optional support if those packages were found
target_compile_definitions(${PROJECT_NAME} INTERFACE
$<$<BOOL:${ZLIB_FOUND}>:CPPHTTPLIB_ZLIB_SUPPORT>
$<$<BOOL:${OPENSSL_FOUND}>:CPPHTTPLIB_OPENSSL_SUPPORT>
)
# Cmake's find_package search path is different based on the system
# See https://cmake.org/cmake/help/latest/command/find_package.html for the list
if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
set(_TARGET_INSTALL_CMAKEDIR "${CMAKE_INSTALL_PREFIX}/cmake/${PROJECT_NAME}")
else()
# On Non-Windows, it should be /usr/lib/cmake/<name>/<name>Config.cmake
# NOTE: This may or may not work for macOS...
set(_TARGET_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
endif()
include(CMakePackageConfigHelpers)
# Configures the meta-file httplibConfig.cmake.in to replace variables with paths/values/etc.
configure_package_config_file("${PROJECT_NAME}Config.cmake.in"
"${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
INSTALL_DESTINATION "${_TARGET_INSTALL_CMAKEDIR}"
# Passes the includedir install path
PATH_VARS CMAKE_INSTALL_FULL_INCLUDEDIR
# There aren't any components, so don't use the macro
NO_CHECK_REQUIRED_COMPONENTS_MACRO
)
# Creates the export httplibTargets.cmake
# This is strictly what holds compilation requirements
# and linkage information (doesn't find deps though).
install(TARGETS ${PROJECT_NAME}
EXPORT httplibTargets
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
)
install(FILES httplib.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
install(FILES
"${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
DESTINATION ${_TARGET_INSTALL_CMAKEDIR}
)
# NOTE: This path changes depending on if it's on Windows or Linux
install(EXPORT httplibTargets
# Puts the targets into the httplib namespace
# So this makes httplib::httplib linkable after doing find_package(httplib)
NAMESPACE ${PROJECT_NAME}::
DESTINATION ${_TARGET_INSTALL_CMAKEDIR}
)

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httplibConfig.cmake.in Normal file
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# Generates a macro to auto-configure everything
@PACKAGE_INIT@
include(CMakeFindDependencyMacro)
# We add find_dependency calls here to not make the end-user have to call them.
find_dependency(Threads REQUIRED)
if(@HTTPLIB_REQUIRE_OPENSSL@)
find_dependency(OpenSSL @_HTTPLIB_OPENSSL_MIN_VER@ REQUIRED)
# Lets you check if these options were correctly enabled for your install
set(HTTPLIB_IS_USING_OPENSSL TRUE)
elseif(@HTTPLIB_USE_OPENSSL_IF_AVAILABLE@)
# Look quietly since it's optional
find_dependency(OpenSSL @_HTTPLIB_OPENSSL_MIN_VER@ QUIET)
# Lets you check if these options were correctly enabled for your install
set(HTTPLIB_IS_USING_OPENSSL @OPENSSL_FOUND@)
else()
set(HTTPLIB_IS_USING_OPENSSL FALSE)
endif()
if(@HTTPLIB_REQUIRE_ZLIB@)
find_dependency(ZLIB REQUIRED)
# Lets you check if these options were correctly enabled for your install
set(HTTPLIB_IS_USING_ZLIB TRUE)
elseif(@HTTPLIB_USE_ZLIB_IF_AVAILABLE@)
# Look quietly since it's optional
find_dependency(ZLIB QUIET)
# Lets you check if these options were correctly enabled for your install
set(HTTPLIB_IS_USING_ZLIB @ZLIB_FOUND@)
else()
set(HTTPLIB_IS_USING_ZLIB FALSE)
endif()
# Lets the end-user find the header path if needed
# This is helpful if you're using Cmake's pre-compiled header feature
set_and_check(HTTPLIB_HEADER_PATH "@PACKAGE_CMAKE_INSTALL_FULL_INCLUDEDIR@/httplib.h")
# Brings in the target library
include("${CMAKE_CURRENT_LIST_DIR}/httplibTargets.cmake")