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curl-curl/CMake/FindGSS.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

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#***************************************************************************
# _ _ ____ _
# 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 GSS Kerberos library
#
# Input variables:
#
# - `GSS_ROOT_DIR`: Absolute path to the root installation of GSS. (also supported as environment)
#
# Defines:
#
# - `GSS_FOUND`: System has a GSS library.
# - `GSS_VERSION`: This is set to version advertised by pkg-config or read from manifest.
# In case the library is found but no version info available it is set to "unknown"
# - `CURL::gss`: GSS library target.
# - `CURL_GSS_FLAVOUR`: Custom property. "GNU" or "MIT" if detected.
set(_gnu_modname "gss")
set(_mit_modname "mit-krb5-gssapi")
include(CheckIncludeFile)
include(CheckIncludeFiles)
include(CheckTypeSize)
set(_gss_root_hints "${GSS_ROOT_DIR}" "$ENV{GSS_ROOT_DIR}")
set(_gss_CFLAGS "")
set(_gss_LIBRARY_DIRS "")
# Try to find library using system pkg-config if user did not specify root dir
if(NOT GSS_ROOT_DIR AND NOT "$ENV{GSS_ROOT_DIR}")
if(CURL_USE_PKGCONFIG)
find_package(PkgConfig QUIET)
pkg_search_module(_gss ${_gnu_modname} ${_mit_modname})
list(APPEND _gss_root_hints "${_gss_PREFIX}")
set(_gss_version "${_gss_VERSION}")
endif()
if(WIN32)
list(APPEND _gss_root_hints "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MIT\\Kerberos;InstallDir]")
endif()
endif()
if(NOT _gss_FOUND) # Not found by pkg-config. Let us take more traditional approach.
find_file(_gss_configure_script NAMES "krb5-config" PATH_SUFFIXES "bin" HINTS ${_gss_root_hints}
NO_CMAKE_PATH NO_CMAKE_ENVIRONMENT_PATH)
# If not found in user-supplied directories, maybe system knows better
find_file(_gss_configure_script NAMES "krb5-config" PATH_SUFFIXES "bin")
if(_gss_configure_script)
set(_gss_INCLUDE_DIRS "")
set(_gss_LIBRARIES "")
execute_process(COMMAND ${_gss_configure_script} "--cflags" "gssapi"
OUTPUT_VARIABLE _gss_cflags_raw
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "FindGSS krb5-config --cflags: ${_gss_cflags_raw}")
if(NOT _gss_configure_failed) # 0 means success
# Should also work in an odd case when multiple directories are given.
string(STRIP "${_gss_cflags_raw}" _gss_cflags_raw)
string(REGEX REPLACE " +-(I)" ";-\\1" _gss_cflags_raw "${_gss_cflags_raw}")
string(REGEX REPLACE " +-([^I][^ \\t;]*)" ";-\\1" _gss_cflags_raw "${_gss_cflags_raw}")
foreach(_flag IN LISTS _gss_cflags_raw)
if(_flag MATCHES "^-I")
string(REGEX REPLACE "^-I" "" _flag "${_flag}")
list(APPEND _gss_INCLUDE_DIRS "${_flag}")
else()
list(APPEND _gss_CFLAGS "${_flag}")
endif()
endforeach()
endif()
execute_process(COMMAND ${_gss_configure_script} "--libs" "gssapi"
OUTPUT_VARIABLE _gss_lib_flags
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "FindGSS krb5-config --libs: ${_gss_lib_flags}")
if(NOT _gss_configure_failed) # 0 means success
# This script gives us libraries and link directories.
string(STRIP "${_gss_lib_flags}" _gss_lib_flags)
string(REGEX REPLACE " +-(L|l)" ";-\\1" _gss_lib_flags "${_gss_lib_flags}")
string(REGEX REPLACE " +-([^Ll][^ \\t;]*)" ";-\\1" _gss_lib_flags "${_gss_lib_flags}")
foreach(_flag IN LISTS _gss_lib_flags)
if(_flag MATCHES "^-l")
string(REGEX REPLACE "^-l" "" _flag "${_flag}")
list(APPEND _gss_LIBRARIES "${_flag}")
elseif(_flag MATCHES "^-L")
string(REGEX REPLACE "^-L" "" _flag "${_flag}")
list(APPEND _gss_LIBRARY_DIRS "${_flag}")
endif()
endforeach()
endif()
execute_process(COMMAND ${_gss_configure_script} "--version"
OUTPUT_VARIABLE _gss_version
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Older versions may not have the "--version" parameter. In this case we just do not care.
if(_gss_configure_failed)
set(_gss_version 0)
else()
# Strip prefix string to leave the version number only
string(REPLACE "Kerberos 5 release " "" _gss_version "${_gss_version}")
endif()
execute_process(COMMAND ${_gss_configure_script} "--vendor"
OUTPUT_VARIABLE _gss_vendor
RESULT_VARIABLE _gss_configure_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Older versions may not have the "--vendor" parameter. In this case we just do not care.
if(NOT _gss_configure_failed AND NOT _gss_vendor MATCHES "Heimdal|heimdal")
set(_gss_flavour "MIT") # assume a default, should not really matter
endif()
else() # Either there is no config script or we are on a platform that does not provide one (Windows?)
find_path(_gss_INCLUDE_DIRS NAMES "gssapi/gssapi.h" HINTS ${_gss_root_hints} PATH_SUFFIXES "include" "inc")
if(_gss_INCLUDE_DIRS) # We have found something
set(_gss_libdir_suffixes "")
cmake_push_check_state()
list(APPEND CMAKE_REQUIRED_INCLUDES "${_gss_INCLUDE_DIRS}")
check_include_files("gssapi/gssapi_generic.h;gssapi/gssapi_krb5.h" _gss_have_mit_headers)
cmake_pop_check_state()
if(_gss_have_mit_headers)
set(_gss_flavour "MIT")
if(WIN32)
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
list(APPEND _gss_libdir_suffixes "lib/AMD64")
set(_gss_libname "gssapi64")
else()
list(APPEND _gss_libdir_suffixes "lib/i386")
set(_gss_libname "gssapi32")
endif()
else()
list(APPEND _gss_libdir_suffixes "lib" "lib64") # those suffixes are not checked for HINTS
set(_gss_libname "gssapi_krb5")
endif()
endif()
else()
find_path(_gss_INCLUDE_DIRS NAMES "gss.h" HINTS ${_gss_root_hints} PATH_SUFFIXES "include")
if(_gss_INCLUDE_DIRS)
set(_gss_flavour "GNU")
set(_gss_pc_requires ${_gnu_modname})
set(_gss_libname "gss")
endif()
endif()
# If we have headers, look up libraries
if(_gss_flavour)
set(_gss_libdir_hints ${_gss_root_hints})
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.20)
cmake_path(GET _gss_INCLUDE_DIRS PARENT_PATH _gss_calculated_potential_root)
else()
get_filename_component(_gss_calculated_potential_root "${_gss_INCLUDE_DIRS}" DIRECTORY)
endif()
list(APPEND _gss_libdir_hints ${_gss_calculated_potential_root})
find_library(_gss_LIBRARIES NAMES ${_gss_libname} HINTS ${_gss_libdir_hints} PATH_SUFFIXES ${_gss_libdir_suffixes})
endif()
endif()
if(NOT _gss_flavour)
message(FATAL_ERROR "GNU or MIT GSS is required")
endif()
else()
# _gss_MODULE_NAME set since CMake 3.16.
# _pkg_check_modules_pkg_name is undocumented and used as a fallback for CMake <3.16 versions.
if(_gss_MODULE_NAME STREQUAL _gnu_modname OR _pkg_check_modules_pkg_name STREQUAL _gnu_modname)
set(_gss_flavour "GNU")
set(_gss_pc_requires ${_gnu_modname})
elseif(_gss_MODULE_NAME STREQUAL _mit_modname OR _pkg_check_modules_pkg_name STREQUAL _mit_modname)
set(_gss_flavour "MIT")
set(_gss_pc_requires ${_mit_modname})
else()
message(FATAL_ERROR "GNU or MIT GSS is required")
endif()
message(STATUS "Found GSS/${_gss_flavour} (via pkg-config): ${_gss_INCLUDE_DIRS} (found version \"${_gss_version}\")")
endif()
set(GSS_VERSION ${_gss_version})
if(NOT GSS_VERSION)
if(_gss_flavour STREQUAL "MIT")
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.24)
cmake_host_system_information(RESULT _mit_version QUERY WINDOWS_REGISTRY
"HKLM/SOFTWARE/MIT/Kerberos/SDK/CurrentVersion" VALUE "VersionString")
else()
get_filename_component(_mit_version
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\MIT\\Kerberos\\SDK\\CurrentVersion;VersionString]" NAME CACHE)
endif()
if(WIN32 AND _mit_version)
set(GSS_VERSION "${_mit_version}")
else()
set(GSS_VERSION "MIT Unknown")
endif()
else() # GNU
if(_gss_INCLUDE_DIRS AND EXISTS "${_gss_INCLUDE_DIRS}/gss.h")
set(_version_regex "#[\t ]*define[\t ]+GSS_VERSION[\t ]+\"([^\"]*)\"")
file(STRINGS "${_gss_INCLUDE_DIRS}/gss.h" _version_str REGEX "${_version_regex}")
string(REGEX REPLACE "${_version_regex}" "\\1" _version_str "${_version_str}")
set(GSS_VERSION "${_version_str}")
unset(_version_regex)
unset(_version_str)
endif()
endif()
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GSS
REQUIRED_VARS
_gss_flavour
_gss_LIBRARIES
VERSION_VAR
GSS_VERSION
FAIL_MESSAGE
"Could NOT find GSS, try to set the absolute path to GSS installation root directory in the environment variable GSS_ROOT_DIR"
)
mark_as_advanced(
_gss_CFLAGS
_gss_FOUND
_gss_INCLUDE_DIRS
_gss_LIBRARIES
_gss_LIBRARY_DIRS
_gss_MODULE_NAME
_gss_PREFIX
_gss_version
)
if(GSS_FOUND)
if(NOT TARGET CURL::gss)
add_library(CURL::gss INTERFACE IMPORTED)
set_target_properties(CURL::gss PROPERTIES
INTERFACE_CURL_GSS_FLAVOUR "${_gss_flavour}"
INTERFACE_LIBCURL_PC_MODULES "${_gss_pc_requires}"
INTERFACE_COMPILE_OPTIONS "${_gss_CFLAGS}"
INTERFACE_INCLUDE_DIRECTORIES "${_gss_INCLUDE_DIRS}"
INTERFACE_LINK_DIRECTORIES "${_gss_LIBRARY_DIRS}"
INTERFACE_LINK_LIBRARIES "${_gss_LIBRARIES}")
endif()
endif()
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