From 518ed51ec762c0512edb53437acb737a5a28942a Mon Sep 17 00:00:00 2001 From: Brad King Date: Fri, 21 Sep 2018 11:59:33 -0400 Subject: cmake: Backport to work with CMake 3.0 again Changes in commit 7867aaa9a0 (cmake: link curl to the OpenSSL targets instead of lib absolute paths, 2018-07-17) and commit f826b4ce98 (cmake: bumped minimum version to 3.4, 2018-07-19) required CMake 3.4 to fix issue #2746. This broke support for users on older versions of CMake even if they just want to build curl and do not care whether transitive dependencies work. Backport the logic to work with CMake 3.0 again by implementing the fix only when the version of CMake is at least 3.4. --- CMakeLists.txt | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/CMakeLists.txt b/CMakeLists.txt index e6dbb73f1..26d4980fc 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -38,7 +38,7 @@ # To check: # (From Daniel Stenberg) The cmake build selected to run gcc with -fPIC on my box while the plain configure script did not. # (From Daniel Stenberg) The gcc command line use neither -g nor any -O options. As a developer, I also treasure our configure scripts's --enable-debug option that sets a long range of "picky" compiler options. -cmake_minimum_required(VERSION 3.4 FATAL_ERROR) +cmake_minimum_required(VERSION 3.0 FATAL_ERROR) set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMake;${CMAKE_MODULE_PATH}") include(Utilities) include(Macros) @@ -352,7 +352,16 @@ if(CMAKE_USE_OPENSSL) set(USE_OPENSSL ON) set(HAVE_LIBCRYPTO ON) set(HAVE_LIBSSL ON) - list(APPEND CURL_LIBS OpenSSL::SSL OpenSSL::Crypto) + + # Depend on OpenSSL via imported targets if supported by the running + # version of CMake. This allows our dependents to get our dependencies + # transitively. + if(NOT CMAKE_VERSION VERSION_LESS 3.4) + list(APPEND CURL_LIBS OpenSSL::SSL OpenSSL::Crypto) + else() + list(APPEND CURL_LIBS ${OPENSSL_LIBRARIES}) + include_directories(${OPENSSL_INCLUDE_DIR}) + endif() set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR}) check_include_file("openssl/crypto.h" HAVE_OPENSSL_CRYPTO_H) -- cgit v1.2.1