curl/CMake/FindNettle.cmake
Viktor Szakats 9dfdc6ff42
cmake: allow pkg-config in more envs
Before this patch, `pkg-config` was used for `UNIX` builds only (with
a few exceptions like wolfSSL, libssh, gsasl, libuv). This patch extends
`pkg-config` use to all envs except: `MSVC` without vcpkg. Meaning MSVC
with vcpkg will now use it. Also mingw on Windows.

Also apply the new condition to options where `pkg-config` was used
unconditionally (= for all targets). These are:
`-DCURL_USE_WOLFSSL=ON`, `-DCURL_USE_LIBSSH=ON`,
`-DCURL_USE_GSASL=ON` and `-DCURL_USE_LIBUV=ON`

This patch may still cause regressions for cross-builds (e.g. mingw
cross-build from Unix) and potentially other cases. If that happens, we
recommend using some of these methods to explicitly disable `pkg-config`
when using CMake:
- CMake option: `-DPKG_CONFIG_EXECUTABLE=`
  (or `-DPKG_CONFIG_EXECUTABLE=nonexistent` or similar)
  This is similar to the (curl-specific) `PKG_CONFIG` env for autotools.
- export env: `PKG_CONFIG_LIBDIR=`
  (or `PKG_CONFIG_PATH`, `PKG_CONFIG_SYSROOT_DIR`,
  or the CMake-specific `PKG_CONFIG`)

We may improve control over this in a future patch, also allowing opting
in MSVC (without vcpkg).

Ref: #14405
Ref: #14408
Ref: #14140
Closes #14483
2024-08-12 14:57:10 +02:00

80 lines
2.8 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 nettle library
#
# Result Variables:
#
# NETTLE_FOUND System has nettle
# NETTLE_INCLUDE_DIRS The nettle include directories
# NETTLE_LIBRARIES The nettle library names
# NETTLE_VERSION Version of nettle
if(NOT MSVC OR VCPKG_TOOLCHAIN)
find_package(PkgConfig QUIET)
pkg_search_module(NETTLE "nettle")
endif()
if(NETTLE_FOUND)
set(NETTLE_LIBRARIES ${NETTLE_LINK_LIBRARIES})
else()
find_path(NETTLE_INCLUDE_DIR NAMES "nettle/sha2.h")
find_library(NETTLE_LIBRARY NAMES "nettle")
if(NETTLE_INCLUDE_DIR)
if(EXISTS "${NETTLE_INCLUDE_DIR}/nettle/version.h")
set(_version_regex_major "^#define[ \t]+NETTLE_VERSION_MAJOR[ \t]+([0-9]+).*")
set(_version_regex_minor "^#define[ \t]+NETTLE_VERSION_MINOR[ \t]+([0-9]+).*")
file(STRINGS "${NETTLE_INCLUDE_DIR}/nettle/version.h"
_version_major REGEX "${_version_regex_major}")
file(STRINGS "${NETTLE_INCLUDE_DIR}/nettle/version.h"
_version_minor REGEX "${_version_regex_minor}")
string(REGEX REPLACE "${_version_regex_major}" "\\1" _version_major "${_version_major}")
string(REGEX REPLACE "${_version_regex_minor}" "\\1" _version_minor "${_version_minor}")
unset(_version_regex_major)
unset(_version_regex_minor)
set(NETTLE_VERSION "${_version_major}.${_version_minor}")
unset(_version_major)
unset(_version_minor)
else()
set(NETTLE_VERSION "0.0")
endif()
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args("nettle"
REQUIRED_VARS
NETTLE_INCLUDE_DIR
NETTLE_LIBRARY
VERSION_VAR
NETTLE_VERSION
)
if(NETTLE_FOUND)
set(NETTLE_INCLUDE_DIRS ${NETTLE_INCLUDE_DIR})
set(NETTLE_LIBRARIES ${NETTLE_LIBRARY})
endif()
mark_as_advanced(NETTLE_INCLUDE_DIR NETTLE_LIBRARY)
endif()