curl/CMake/FindRustls.cmake
Viktor Szakats d511ec8b0a
build: omit certain deps from libcurl.pc unless found via pkg-config
The idea of linking dependencies found to `libcurl.pc` turns out not
to work in practice in some cases.

Specifically: gss, ldap, mbedtls, libmsh3, rustls

A `.pc` may not work or be missing for a couple of reasons:
- not all build methods generate it: mbedTLS, Rustls
- generated file is broken: msh3
  Ref: https://github.com/nibanks/msh3/pull/225
- installed package flavour isn't shipping with one:
  FreeBSD GSS, OmniOS LDAP, macOS LDAP

The effect of such issues shall be subtle in theory, because
`libcurl.pc` normally lists these dependencies in the `Requires.private`
section meant for static linking. But, e.g. `pkg-config --exists`
requires these to be present, and builds sometimes use this check
regardless of build type. This bug is not present in `pkgconf`; it only
checks for them when `--static` is also passed.

Fix these by adding affected `.pc` references to `libcurl.pc` only when
we detected the dependency via `pkg-config`.

There are a few side-effects of this solution:
- references are never added for dependencies where curl doesn't
  implement `pkg-config` detection. These are:
  - autotools: ldap, mbedtls, msh3
  - cmake: ldap (pending #15273)
- generated `libcurl.pc` depends on the build-time environment.
- generated `libcurl.pc` depends on curl build tool (cmake, autotools).
- generated `libcurl.pc` depends on curl build implementation details.

Make an exception for GNU GSS, where I blindly guess that `gss.pc` is
always available, as no issues were reported.

Other, not mentioned, dependencies continue to be added regardless
of the detection method.

Reported-by: Harmen Stoppels, Thomas, Daniel Engberg, Andy Fiddaman
Fixes #15469
Fixes #15507
Fixes #15535
Fixes https://github.com/curl/curl/pull/15163#issuecomment-2473358444
Closes #15573
2024-11-14 22:38:47 +01:00

104 lines
3.3 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 Rustls library
#
# Input variables:
#
# - `RUSTLS_INCLUDE_DIR`: The Rustls include directory.
# - `RUSTLS_LIBRARY`: Path to `rustls` library.
#
# Result variables:
#
# - `RUSTLS_FOUND`: System has Rustls.
# - `RUSTLS_INCLUDE_DIRS`: The Rustls include directories.
# - `RUSTLS_LIBRARIES`: The Rustls library names.
# - `RUSTLS_LIBRARY_DIRS`: The Rustls library directories.
# - `RUSTLS_PC_REQUIRES`: The Rustls pkg-config packages.
# - `RUSTLS_CFLAGS`: Required compiler flags.
# - `RUSTLS_VERSION`: Version of Rustls.
if(CURL_USE_PKGCONFIG AND
NOT DEFINED RUSTLS_INCLUDE_DIR AND
NOT DEFINED RUSTLS_LIBRARY)
find_package(PkgConfig QUIET)
pkg_check_modules(RUSTLS "rustls")
endif()
if(RUSTLS_FOUND)
set(RUSTLS_PC_REQUIRES "rustls")
string(REPLACE ";" " " RUSTLS_CFLAGS "${RUSTLS_CFLAGS}")
message(STATUS "Found Rustls (via pkg-config): ${RUSTLS_INCLUDE_DIRS} (found version \"${RUSTLS_VERSION}\")")
else()
find_path(RUSTLS_INCLUDE_DIR NAMES "rustls.h")
find_library(RUSTLS_LIBRARY NAMES "rustls")
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Rustls
REQUIRED_VARS
RUSTLS_INCLUDE_DIR
RUSTLS_LIBRARY
)
if(RUSTLS_FOUND)
set(RUSTLS_INCLUDE_DIRS ${RUSTLS_INCLUDE_DIR})
set(RUSTLS_LIBRARIES ${RUSTLS_LIBRARY})
endif()
mark_as_advanced(RUSTLS_INCLUDE_DIR RUSTLS_LIBRARY)
endif()
if(APPLE)
find_library(SECURITY_FRAMEWORK "Security")
mark_as_advanced(SECURITY_FRAMEWORK)
if(NOT SECURITY_FRAMEWORK)
message(FATAL_ERROR "Security framework not found")
endif()
list(APPEND RUSTLS_LIBRARIES "-framework Security")
find_library(FOUNDATION_FRAMEWORK "Foundation")
mark_as_advanced(FOUNDATION_FRAMEWORK)
if(NOT FOUNDATION_FRAMEWORK)
message(FATAL_ERROR "Foundation framework not found")
endif()
list(APPEND RUSTLS_LIBRARIES "-framework Foundation")
elseif(NOT WIN32)
find_library(_pthread_library "pthread")
if(_pthread_library)
list(APPEND RUSTLS_LIBRARIES "pthread")
endif()
mark_as_advanced(_pthread_library)
find_library(_dl_library "dl")
if(_dl_library)
list(APPEND RUSTLS_LIBRARIES "dl")
endif()
mark_as_advanced(_dl_library)
find_library(_math_library "m")
if(_math_library)
list(APPEND RUSTLS_LIBRARIES "m")
endif()
mark_as_advanced(_math_library)
endif()