curl/CMake/FindWolfSSL.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

125 lines
4.4 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 wolfSSL library
#
# Input variables:
#
# - `WOLFSSL_INCLUDE_DIR`: Absolute path to wolfSSL include directory.
# - `WOLFSSL_LIBRARY`: Absolute path to `wolfssl` library.
#
# Defines:
#
# - `WOLFSSL_FOUND`: System has wolfSSL.
# - `WOLFSSL_VERSION`: Version of wolfSSL.
# - `CURL::wolfssl`: wolfSSL library target.
if(DEFINED WolfSSL_INCLUDE_DIR AND NOT DEFINED WOLFSSL_INCLUDE_DIR)
message(WARNING "WolfSSL_INCLUDE_DIR is deprecated, use WOLFSSL_INCLUDE_DIR instead.")
set(WOLFSSL_INCLUDE_DIR "${WolfSSL_INCLUDE_DIR}")
endif()
if(DEFINED WolfSSL_LIBRARY AND NOT DEFINED WOLFSSL_LIBRARY)
message(WARNING "WolfSSL_LIBRARY is deprecated, use WOLFSSL_LIBRARY instead.")
set(WOLFSSL_LIBRARY "${WolfSSL_LIBRARY}")
endif()
set(_wolfssl_pc_requires "wolfssl")
if(CURL_USE_PKGCONFIG AND
NOT DEFINED WOLFSSL_INCLUDE_DIR AND
NOT DEFINED WOLFSSL_LIBRARY)
find_package(PkgConfig QUIET)
pkg_check_modules(_wolfssl ${_wolfssl_pc_requires})
endif()
if(_wolfssl_FOUND)
set(WolfSSL_FOUND TRUE)
set(WOLFSSL_FOUND TRUE)
set(WOLFSSL_VERSION ${_wolfssl_VERSION})
message(STATUS "Found WolfSSL (via pkg-config): ${_wolfssl_INCLUDE_DIRS} (found version \"${WOLFSSL_VERSION}\")")
else()
find_path(WOLFSSL_INCLUDE_DIR NAMES "wolfssl/ssl.h")
find_library(WOLFSSL_LIBRARY NAMES "wolfssl")
unset(WOLFSSL_VERSION CACHE)
if(WOLFSSL_INCLUDE_DIR AND EXISTS "${WOLFSSL_INCLUDE_DIR}/wolfssl/version.h")
set(_version_regex "#[\t ]*define[\t ]+LIBWOLFSSL_VERSION_STRING[\t ]+\"([^\"]*)\"")
file(STRINGS "${WOLFSSL_INCLUDE_DIR}/wolfssl/version.h" _version_str REGEX "${_version_regex}")
string(REGEX REPLACE "${_version_regex}" "\\1" _version_str "${_version_str}")
set(WOLFSSL_VERSION "${_version_str}")
unset(_version_regex)
unset(_version_str)
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(WolfSSL
REQUIRED_VARS
WOLFSSL_INCLUDE_DIR
WOLFSSL_LIBRARY
VERSION_VAR
WOLFSSL_VERSION
)
if(WOLFSSL_FOUND)
set(_wolfssl_INCLUDE_DIRS ${WOLFSSL_INCLUDE_DIR})
set(_wolfssl_LIBRARIES ${WOLFSSL_LIBRARY})
endif()
mark_as_advanced(WOLFSSL_INCLUDE_DIR WOLFSSL_LIBRARY)
endif()
if(WOLFSSL_FOUND)
if(APPLE)
find_library(SECURITY_FRAMEWORK NAMES "Security")
mark_as_advanced(SECURITY_FRAMEWORK)
if(NOT SECURITY_FRAMEWORK)
message(FATAL_ERROR "Security framework not found")
endif()
list(APPEND _wolfssl_LIBRARIES "-framework Security")
find_library(COREFOUNDATION_FRAMEWORK NAMES "CoreFoundation")
mark_as_advanced(COREFOUNDATION_FRAMEWORK)
if(NOT COREFOUNDATION_FRAMEWORK)
message(FATAL_ERROR "CoreFoundation framework not found")
endif()
list(APPEND _wolfssl_LIBRARIES "-framework CoreFoundation")
elseif(WIN32)
list(APPEND _wolfssl_LIBRARIES "crypt32")
else()
find_library(MATH_LIBRARY NAMES "m")
if(MATH_LIBRARY)
list(APPEND _wolfssl_LIBRARIES ${MATH_LIBRARY}) # for log and pow
endif()
mark_as_advanced(MATH_LIBRARY)
endif()
if(NOT TARGET CURL::wolfssl)
add_library(CURL::wolfssl INTERFACE IMPORTED)
set_target_properties(CURL::wolfssl PROPERTIES
INTERFACE_LIBCURL_PC_MODULES "${_wolfssl_pc_requires}"
INTERFACE_COMPILE_OPTIONS "${_wolfssl_CFLAGS}"
INTERFACE_INCLUDE_DIRECTORIES "${_wolfssl_INCLUDE_DIRS}"
INTERFACE_LINK_DIRECTORIES "${_wolfssl_LIBRARY_DIRS}"
INTERFACE_LINK_LIBRARIES "${_wolfssl_LIBRARIES}")
endif()
endif()