curl-curl/CMake/FindLibssh.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

119 lines
4.5 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 libssh library
#
# Input variables:
#
# - `LIBSSH_INCLUDE_DIR`: Absolute path to libssh include directory.
# - `LIBSSH_LIBRARY`: Absolute path to `libssh` library.
# - `LIBSSH_USE_STATIC_LIBS`: Configure for static libssh libraries.
#
# Defines:
#
# - `LIBSSH_FOUND`: System has libssh.
# - `LIBSSH_VERSION`: Version of libssh.
# - `CURL::libssh`: libssh library target.
set(_libssh_pc_requires "libssh")
if(CURL_USE_PKGCONFIG AND
NOT DEFINED LIBSSH_INCLUDE_DIR AND
NOT DEFINED LIBSSH_LIBRARY)
find_package(PkgConfig QUIET)
pkg_check_modules(_libssh ${_libssh_pc_requires})
endif()
if(_libssh_FOUND)
set(Libssh_FOUND TRUE)
set(LIBSSH_FOUND TRUE)
set(LIBSSH_VERSION ${_libssh_VERSION})
if(LIBSSH_USE_STATIC_LIBS)
set(_libssh_CFLAGS "${_libssh_STATIC_CFLAGS}")
set(_libssh_INCLUDE_DIRS "${_libssh_STATIC_INCLUDE_DIRS}")
set(_libssh_LIBRARY_DIRS "${_libssh_STATIC_LIBRARY_DIRS}")
set(_libssh_LIBRARIES "${_libssh_STATIC_LIBRARIES}")
endif()
message(STATUS "Found Libssh (via pkg-config): ${_libssh_INCLUDE_DIRS} (found version \"${LIBSSH_VERSION}\")")
else()
find_path(LIBSSH_INCLUDE_DIR NAMES "libssh/libssh.h")
if(LIBSSH_USE_STATIC_LIBS)
set(_libssh_CFLAGS "-DLIBSSH_STATIC")
find_library(LIBSSH_LIBRARY NAMES "ssh_static" "libssh_static" "ssh" "libssh")
else()
find_library(LIBSSH_LIBRARY NAMES "ssh" "libssh")
endif()
unset(LIBSSH_VERSION CACHE)
if(LIBSSH_INCLUDE_DIR AND EXISTS "${LIBSSH_INCLUDE_DIR}/libssh/libssh_version.h")
set(_version_regex1 "#[\t ]*define[\t ]+LIBSSH_VERSION_MAJOR[\t ]+([0-9]+).*")
set(_version_regex2 "#[\t ]*define[\t ]+LIBSSH_VERSION_MINOR[\t ]+([0-9]+).*")
set(_version_regex3 "#[\t ]*define[\t ]+LIBSSH_VERSION_MICRO[\t ]+([0-9]+).*")
file(STRINGS "${LIBSSH_INCLUDE_DIR}/libssh/libssh_version.h" _version_str1 REGEX "${_version_regex1}")
file(STRINGS "${LIBSSH_INCLUDE_DIR}/libssh/libssh_version.h" _version_str2 REGEX "${_version_regex2}")
file(STRINGS "${LIBSSH_INCLUDE_DIR}/libssh/libssh_version.h" _version_str3 REGEX "${_version_regex3}")
string(REGEX REPLACE "${_version_regex1}" "\\1" _version_str1 "${_version_str1}")
string(REGEX REPLACE "${_version_regex2}" "\\1" _version_str2 "${_version_str2}")
string(REGEX REPLACE "${_version_regex3}" "\\1" _version_str3 "${_version_str3}")
set(LIBSSH_VERSION "${_version_str1}.${_version_str2}.${_version_str3}")
unset(_version_regex1)
unset(_version_regex2)
unset(_version_regex3)
unset(_version_str1)
unset(_version_str2)
unset(_version_str3)
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Libssh
REQUIRED_VARS
LIBSSH_INCLUDE_DIR
LIBSSH_LIBRARY
VERSION_VAR
LIBSSH_VERSION
)
if(LIBSSH_FOUND)
set(_libssh_INCLUDE_DIRS ${LIBSSH_INCLUDE_DIR})
set(_libssh_LIBRARIES ${LIBSSH_LIBRARY})
endif()
mark_as_advanced(LIBSSH_INCLUDE_DIR LIBSSH_LIBRARY)
endif()
if(LIBSSH_FOUND)
if(WIN32)
list(APPEND _libssh_LIBRARIES "iphlpapi") # for if_nametoindex
endif()
if(NOT TARGET CURL::libssh)
add_library(CURL::libssh INTERFACE IMPORTED)
set_target_properties(CURL::libssh PROPERTIES
INTERFACE_LIBCURL_PC_MODULES "${_libssh_pc_requires}"
INTERFACE_COMPILE_OPTIONS "${_libssh_CFLAGS}"
INTERFACE_INCLUDE_DIRECTORIES "${_libssh_INCLUDE_DIRS}"
INTERFACE_LINK_DIRECTORIES "${_libssh_LIBRARY_DIRS}"
INTERFACE_LINK_LIBRARIES "${_libssh_LIBRARIES}")
endif()
endif()