Improve find and package support

.travis.yml

@@ -20,5 +20,13 @@ matrix:
     - os: osx
       env: BUILD=Doc
 
+addons:
+  apt:
+    sources:
+    - kubuntu-backports                   # cmake 2.8.12
+#    - george-edison55-precise-backports   # cmake 3.2.3
+    packages:
+    - cmake
+
 script:
   - support/travis-build.py

CMakeLists.txt

@@ -1,6 +1,6 @@
 message(STATUS "CMake version: ${CMAKE_VERSION}")
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.12)
 
 # Set the default CMAKE_BUILD_TYPE to Release.
 # This should be done before the project command since the latter can set
@@ -142,7 +142,7 @@ endif ()
 set_target_properties(cppformat PROPERTIES
   VERSION ${CPPFORMAT_VERSION} SOVERSION ${CPACK_PACKAGE_VERSION_MAJOR})
 
-if (EXISTS .gitignore)
+if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.gitignore")
   # Get the list of ignored files from .gitignore.
   file (STRINGS ".gitignore" lines)
   LIST(REMOVE_ITEM lines /doc/html)
@@ -156,15 +156,53 @@ if (EXISTS .gitignore)
 
   set(CPACK_SOURCE_GENERATOR ZIP)
   set(CPACK_SOURCE_IGNORE_FILES ${ignored_files})
-  set(CPACK_SOURCE_PACKAGE_FILE_NAME cppformat-${CPPFORMAT_VERSION})
+  set(CPACK_SOURCE_PACKAGE_FILE_NAME "cppformat-${CPPFORMAT_VERSION}")
+  set(CPACK_PACKAGE_NAME "cppformat")
   set(CPACK_RESOURCE_FILE_README ${FORMAT_SOURCE_DIR}/README.rst)
   include(CPack)
 endif ()
 
 # Install targets.
 if (FMT_INSTALL)
-  set(FMT_LIB_DIR lib CACHE STRING
+  include(CMakePackageConfigHelpers)
+  set(config_install_dir "lib/cmake/cppformat")
+  set(version_config "${CMAKE_CURRENT_BINARY_DIR}/cppformatConfigVersion.cmake")
+  set(project_config "${CMAKE_CURRENT_BINARY_DIR}/cppformatConfig.cmake")
+  set(targets_export_name "cppformatTargets")
+
+  set(FMT_LIB_DIR "lib" CACHE STRING
     "Installation directory for libraries, relative to ${CMAKE_INSTALL_PREFIX}.")
-  install(TARGETS cppformat DESTINATION ${FMT_LIB_DIR})
-  install(FILES format.h DESTINATION include/cppformat)
+
+  # copy the header into the build directory to mimic the installed tree
+  configure_file("format.h" "cppformat/format.h" COPYONLY)
+  # add the include directories for both build and install tree
+  target_include_directories(
+    cppformat PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+    $<INSTALL_INTERFACE:include>
+  )
+
+  # generate the version, config and target files into the build directory
+  write_basic_package_version_file(
+    "${version_config}"
+    VERSION ${CPPFORMAT_VERSION}
+    COMPATIBILITY AnyNewerVersion
+  )
+  configure_package_config_file(
+    "support/cmake/cppformatConfig.cmake.in"
+    "${project_config}"
+    INSTALL_DESTINATION "${config_install_dir}"
+  )
+  export(TARGETS cppformat FILE "${targets_export_name}.cmake")
+
+  # install version, config and target files
+  install(
+      FILES "${project_config}" "${version_config}"
+      DESTINATION "${config_install_dir}"
+  )
+  install(EXPORT "${targets_export_name}" DESTINATION "${config_install_dir}")
+
+  # install the library and the include file
+  install(TARGETS cppformat EXPORT "${targets_export_name}" DESTINATION "${FMT_LIB_DIR}")
+  install(FILES format.h DESTINATION "include/cppformat")
 endif ()

support/cmake/cppformatConfig.cmake.in

@@ -0,0 +1,4 @@
+@PACKAGE_INIT@
+
+include("${CMAKE_CURRENT_LIST_DIR}/@[email protected]")
+check_required_components("cppformat")

test/CMakeLists.txt

@@ -10,12 +10,6 @@ function (target_link_cppformat target)
   endif ()
 endfunction ()
 
-function (fmt_target_include_directories)
-  if (CMAKE_MAJOR_VERSION VERSION_GREATER 2.8.10)
-    target_include_directories(${ARGN})
-  endif ()
-endfunction ()
-
 # We compile Google Test ourselves instead of using pre-compiled libraries.
 # See the Google Test FAQ "Why is it not recommended to install a
 # pre-compiled copy of Google Test (for example, into /usr/local)?"
@@ -24,7 +18,7 @@ endfunction ()
 add_library(gmock STATIC
   ${FMT_GMOCK_DIR}/gmock-gtest-all.cc ${FMT_GMOCK_DIR}/gmock/gmock.h
   ${FMT_GMOCK_DIR}/gtest/gtest.h ${FMT_GMOCK_DIR}/gtest/gtest-spi.h)
-fmt_target_include_directories(gmock INTERFACE ${FMT_GMOCK_DIR})
+target_include_directories(gmock INTERFACE ${FMT_GMOCK_DIR})
 find_package(Threads)
 if (Threads_FOUND)
   target_link_libraries(gmock ${CMAKE_THREAD_LIBS_INIT})
@@ -43,7 +37,7 @@ check_cxx_source_compiles("
 check_cxx_source_compiles("
   #include <initializer_list>
   int main() {}" FMT_INITIALIZER_LIST)
-  
+
 if (NOT FMT_VARIADIC_TEMPLATES OR NOT FMT_INITIALIZER_LIST)
   add_definitions(-DGTEST_LANG_CXX11=0)
 endif ()