curl-curl/CMake/FindLibssh2.cmake
Viktor Szakats 89043ba906
cmake: drop support for CMake 3.17 and older
Require CMake 3.18 (2020-07-15) or newer, up from 3.7 (2016-11-11)
prior to this patch.

This requirement also applies to the distributed `curl-config.cmake`.

To allow dropping compatibility code maintained for old versions, and to
use features which were unpractical in separate code paths. Also to make
testing, documentation and development easier, CI builds faster due to
CMake performance improvements over time. (e.g. integration tests on
macOS run 8x faster (10 minutes is now under 1.5m) in CI, 2.5x faster on
Windows.)

CMake offers pre-built binaries for major platforms. They work without
an install step, just by unpacking and pointing the cmake command to
them. Making upgrades easy in many cases:
https://cmake.org/download/
https://cmake.org/files/
https://github.com/Kitware/CMake/releases

CMake 3.18 brings these feature as generally available when building or
consuming curl/libcurl:

LTO support, improved performance, `pkg-config` and interface target
support, `OBJECT` target (for faster libcurl builds), modern invocation
with `-S`/`-B` options, better support for custom linker options,
FetchContent, `GnuTLS::GnuTLS` target, `--verbose` and `--install`
options, `CMAKE_GENERATOR` env, last but not least unity mode and Ninja
generator.

For maximum build speed, use:
`-DCMAKE_UNITY_BUILD=ON -DCURL_DROP_UNUSED=ON`

As for deprecations, C++11 is required to build CMake itself, which may
be a limit on some platforms. autotools continues to cover them.

Follow-up to 9bcdfb3809 #20408
Follow-up to a7c974e038 #19902
Follow-up to dfbe035c8b #10161
Discussion: https://github.com/curl/curl/discussions/18704

Closes #20407
2026-03-21 13:24:47 +01:00

104 lines
3.7 KiB
CMake

#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
# SPDX-License-Identifier: curl
#
###########################################################################
# Find the libssh2 library
#
# Input variables:
#
# - `LIBSSH2_INCLUDE_DIR`: Absolute path to libssh2 include directory.
# - `LIBSSH2_LIBRARY`: Absolute path to `libssh2` library.
# - `LIBSSH2_USE_STATIC_LIBS`: Configure for static libssh2 libraries.
#
# Defines:
#
# - `LIBSSH2_FOUND`: System has libssh2.
# - `LIBSSH2_VERSION`: Version of libssh2.
# - `CURL::libssh2`: libssh2 library target.
set(_libssh2_pc_requires "libssh2")
if(CURL_USE_PKGCONFIG AND
NOT DEFINED LIBSSH2_INCLUDE_DIR AND
NOT DEFINED LIBSSH2_LIBRARY)
find_package(PkgConfig QUIET)
pkg_check_modules(_libssh2 ${_libssh2_pc_requires})
endif()
if(_libssh2_FOUND AND _libssh2_INCLUDE_DIRS)
set(Libssh2_FOUND TRUE)
set(LIBSSH2_FOUND TRUE)
set(LIBSSH2_VERSION ${_libssh2_VERSION})
if(LIBSSH2_USE_STATIC_LIBS)
set(_libssh2_CFLAGS "${_libssh2_STATIC_CFLAGS}")
set(_libssh2_INCLUDE_DIRS "${_libssh2_STATIC_INCLUDE_DIRS}")
set(_libssh2_LIBRARY_DIRS "${_libssh2_STATIC_LIBRARY_DIRS}")
set(_libssh2_LIBRARIES "${_libssh2_STATIC_LIBRARIES}")
endif()
message(STATUS "Found Libssh2 (via pkg-config): ${_libssh2_INCLUDE_DIRS} (found version \"${LIBSSH2_VERSION}\")")
else()
find_path(LIBSSH2_INCLUDE_DIR NAMES "libssh2.h")
if(LIBSSH2_USE_STATIC_LIBS)
find_library(LIBSSH2_LIBRARY NAMES "ssh2_static" "libssh2_static" "ssh2" "libssh2")
else()
find_library(LIBSSH2_LIBRARY NAMES "ssh2" "libssh2")
endif()
unset(LIBSSH2_VERSION CACHE)
if(LIBSSH2_INCLUDE_DIR AND EXISTS "${LIBSSH2_INCLUDE_DIR}/libssh2.h")
set(_version_regex "#[\t ]*define[\t ]+LIBSSH2_VERSION[\t ]+\"([^\"]*)\"")
file(STRINGS "${LIBSSH2_INCLUDE_DIR}/libssh2.h" _version_str REGEX "${_version_regex}")
string(REGEX REPLACE "${_version_regex}" "\\1" _version_str "${_version_str}")
set(LIBSSH2_VERSION "${_version_str}")
unset(_version_regex)
unset(_version_str)
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Libssh2
REQUIRED_VARS
LIBSSH2_INCLUDE_DIR
LIBSSH2_LIBRARY
VERSION_VAR
LIBSSH2_VERSION
)
if(LIBSSH2_FOUND)
set(_libssh2_INCLUDE_DIRS ${LIBSSH2_INCLUDE_DIR})
set(_libssh2_LIBRARIES ${LIBSSH2_LIBRARY})
endif()
mark_as_advanced(LIBSSH2_INCLUDE_DIR LIBSSH2_LIBRARY)
endif()
if(LIBSSH2_FOUND)
if(NOT TARGET CURL::libssh2)
add_library(CURL::libssh2 INTERFACE IMPORTED)
set_target_properties(CURL::libssh2 PROPERTIES
INTERFACE_LIBCURL_PC_MODULES "${_libssh2_pc_requires}"
INTERFACE_COMPILE_OPTIONS "${_libssh2_CFLAGS}"
INTERFACE_INCLUDE_DIRECTORIES "${_libssh2_INCLUDE_DIRS}"
INTERFACE_LINK_DIRECTORIES "${_libssh2_LIBRARY_DIRS}"
INTERFACE_LINK_LIBRARIES "${_libssh2_LIBRARIES}")
endif()
endif()