A bunch of CMake fixes (#1178)

AWSCRTAndroidTestRunner/app/src/main/cpp/CMakeLists.txt

@@ -3,7 +3,7 @@
 
 # Sets the minimum version of CMake required to build the native library.
 
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.9...3.31)
 
 # AWS lib
 set(path_to_common "${CMAKE_CURRENT_LIST_DIR}/../../../../..")

CMakeLists.txt

@@ -3,17 +3,13 @@
 
 # As of October 2024, we picked 3.9 as our version because internally we still support RHEL5 and AL2012, and CMake 3.9
 # was the latest version available on those platforms.
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.9...3.31)
 option(ALLOW_CROSS_COMPILED_TESTS "Allow tests to be compiled via cross compile, for use with qemu" OFF)
 
 project(aws-c-common LANGUAGES C VERSION 0.1.0)
 
 message(STATUS "CMake ${CMAKE_VERSION}")
 
-if (POLICY CMP0077)
-    cmake_policy(SET CMP0077 OLD) # Enable options to get their values from normal variables
-endif()
-
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(AwsCFlags)
 include(AwsCheckHeaders)
@@ -23,6 +19,7 @@ include(AwsSanitizers)
 include(AwsThreadAffinity)
 include(AwsThreadName)
 include(CTest)
+include(GNUInstallDirs)
 
 set(GENERATED_ROOT_DIR "${CMAKE_CURRENT_BINARY_DIR}/generated")
 set(GENERATED_INCLUDE_DIR "${GENERATED_ROOT_DIR}/include")
@@ -247,7 +244,7 @@ foreach(HEADER_SRCPATH IN ITEMS ${AWS_COMMON_HEADERS} ${AWS_COMMON_OS_HEADERS} $
 
     unset(HEADER_DSTDIR)
 
-    foreach(POTENTIAL_PREFIX IN ITEMS ${GENERATED_ROOT_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
+    foreach(POTENTIAL_PREFIX IN ITEMS "${GENERATED_INCLUDE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/include")
         string(LENGTH ${POTENTIAL_PREFIX} _prefixlen)
         string(SUBSTRING ${HEADER_DIR} 0 ${_prefixlen} _actual_prefix)
         if(${_actual_prefix} STREQUAL ${POTENTIAL_PREFIX})
@@ -261,7 +258,7 @@ foreach(HEADER_SRCPATH IN ITEMS ${AWS_COMMON_HEADERS} ${AWS_COMMON_OS_HEADERS} $
     endif()
 
     install(FILES ${HEADER_SRCPATH}
-            DESTINATION ${HEADER_DSTDIR}
+            DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${HEADER_DSTDIR}"
             COMPONENT Development)
 endforeach()
 
@@ -278,12 +275,12 @@ else()
 endif()
 
 install(EXPORT "${PROJECT_NAME}-targets"
-    DESTINATION "${LIBRARY_DIRECTORY}/${PROJECT_NAME}/cmake/${TARGET_DIR}"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}/${TARGET_DIR}"
     NAMESPACE AWS::
     COMPONENT Development)
 
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake"
-    DESTINATION "${LIBRARY_DIRECTORY}/${PROJECT_NAME}/cmake"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
     COMPONENT Development)
 
 list(APPEND EXPORT_MODULES
@@ -300,7 +297,7 @@ list(APPEND EXPORT_MODULES
     )
 
 install(FILES ${EXPORT_MODULES}
-        DESTINATION "${LIBRARY_DIRECTORY}/cmake"
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}/modules"
         COMPONENT Development)
 
 # This should come last, to ensure all variables defined by cmake will be available for export

bin/system_info/CMakeLists.txt

@@ -1,7 +1,5 @@
 project(print-sys-info C)
 
-list(APPEND CMAKE_MODULE_PATH "${CMAKE_INSTALL_PREFIX}/lib/cmake")
-
 file(GLOB SI_SRC
         "*.c"
         )

cmake/AwsSharedLibSetup.cmake

@@ -1,46 +1,32 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0.
 
-set(LIBRARY_DIRECTORY lib)
-set(RUNTIME_DIRECTORY bin)
-# Set the default lib installation path on GNU systems with GNUInstallDirs
-if (UNIX AND NOT APPLE)
-    include(GNUInstallDirs)
-    set(LIBRARY_DIRECTORY ${CMAKE_INSTALL_LIBDIR})
-    set(RUNTIME_DIRECTORY ${CMAKE_INSTALL_BINDIR})
-
-    # this is the absolute dumbest thing in the world, but find_package won't work without it
-    # also I verified this is correctly NOT "lib64" when CMAKE_C_FLAGS includes "-m32"
-    if (${LIBRARY_DIRECTORY} STREQUAL "lib64")
-        set(FIND_LIBRARY_USE_LIB64_PATHS true)
-    endif()
-endif()
-
+include(GNUInstallDirs)
 
 function(aws_prepare_shared_lib_exports target)
     if (BUILD_SHARED_LIBS)
         install(TARGETS ${target}
                 EXPORT ${target}-targets
                 ARCHIVE
-                DESTINATION ${LIBRARY_DIRECTORY}
+                DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 COMPONENT Development
                 LIBRARY
-                DESTINATION ${LIBRARY_DIRECTORY}
+                DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 NAMELINK_SKIP
                 COMPONENT Runtime
                 RUNTIME
-                DESTINATION ${RUNTIME_DIRECTORY}
+                DESTINATION ${CMAKE_INSTALL_BINDIR}
                 COMPONENT Runtime)
         install(TARGETS ${target}
                 EXPORT ${target}-targets
                 LIBRARY
-                DESTINATION ${LIBRARY_DIRECTORY}
+                DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 NAMELINK_ONLY
                 COMPONENT Development)
     else()
         install(TARGETS ${target}
                 EXPORT ${target}-targets
-                ARCHIVE DESTINATION ${LIBRARY_DIRECTORY}
+                ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 COMPONENT Development)
     endif()
 endfunction()

cmake/CPackConfig.cmake

@@ -62,7 +62,7 @@ endif()
 # By default, we'll try to claim the cmake directory under the library directory
 # and the aws include directory. We have to share both of these
 set(CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION
-    /usr/${LIBRARY_DIRECTORY}/cmake
+    /usr/${CMAKE_INSTALL_LIBDIR}/cmake
     /usr/include/aws)
 
 # Include CPack, which generates the package target

cmake/aws-c-common-config.cmake

@@ -1,3 +1,6 @@
+# make installed modules (e.g. AwsCFlags.cmake) available to dependencies
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/modules)
+
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 
 if(WIN32 OR UNIX OR APPLE)