Build: Fix issues w/ Ninja Multi-Config generator

- Fix an issue whereby a build with ENABLE_SHARED=0 could not be
  installed when using the Ninja Multi-Config CMake generator.

- Fix an issue whereby a Windows installer could not be built when using
  the Ninja Multi-Config CMake generator.

- Fix an issue whereby the Java regression tests failed when using the
  Ninja Multi-Config CMake generator.

Based on:
4f169deeb0

Closes #626

CMakeLists.txt

@@ -40,6 +40,15 @@ set(LIBJPEG_TURBO_VERSION_NUMBER ${VERSION_MAJOR}${VERSION_MINOR}${VERSION_REVIS
 # application bundles would break our iOS packages.)
 set(CMAKE_MACOSX_BUNDLE FALSE)
 
+get_property(GENERATOR_IS_MULTI_CONFIG GLOBAL PROPERTY
+  GENERATOR_IS_MULTI_CONFIG)
+# If the GENERATOR_IS_MULTI_CONFIG property doesn't exist (CMake < 3.9), then
+# set the GENERATOR_IS_MULTI_CONFIG variable manually if the generator is
+# Visual Studio or Xcode (the only multi-config generators in CMake < 3.9).
+if(NOT GENERATOR_IS_MULTI_CONFIG AND (MSVC_IDE OR XCODE))
+  set(GENERATOR_IS_MULTI_CONFIG TRUE)
+endif()
+
 string(TIMESTAMP DEFAULT_BUILD "%Y%m%d")
 set(BUILD ${DEFAULT_BUILD} CACHE STRING "Build string (default: ${DEFAULT_BUILD})")
 
@@ -734,7 +743,7 @@ add_executable(strtest strtest.c)
 
 add_subdirectory(md5)
 
-if(MSVC_IDE OR XCODE)
+if(GENERATOR_IS_MULTI_CONFIG)
   set(OBJDIR "\${CTEST_CONFIGURATION_TYPE}/")
 else()
   set(OBJDIR "")
@@ -1468,7 +1477,7 @@ if(WITH_TURBOJPEG)
       INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
       ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     if(NOT ENABLE_SHARED)
-      if(MSVC_IDE OR XCODE)
+      if(GENERATOR_IS_MULTI_CONFIG)
         set(DIR "${CMAKE_CURRENT_BINARY_DIR}/\${CMAKE_INSTALL_CONFIG_NAME}")
       else()
         set(DIR ${CMAKE_CURRENT_BINARY_DIR})
@@ -1486,7 +1495,7 @@ if(ENABLE_STATIC)
     INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
   if(NOT ENABLE_SHARED)
-    if(MSVC_IDE OR XCODE)
+    if(GENERATOR_IS_MULTI_CONFIG)
       set(DIR "${CMAKE_CURRENT_BINARY_DIR}/\${CMAKE_INSTALL_CONFIG_NAME}")
     else()
       set(DIR ${CMAKE_CURRENT_BINARY_DIR})

ChangeLog.md

@@ -1,3 +1,14 @@
+2.1.5
+=====
+
+### Significant changes relative to 2.1.4:
+
+1. Fixed issues in the build system whereby, when using the Ninja Multi-Config
+CMake generator, a static build of libjpeg-turbo (a build in which
+`ENABLE_SHARED` is `0`) could not be installed, a Windows installer could not
+be built, and the Java regression tests failed.
+
+
 2.1.4
 =====
 

cmakescripts/BuildPackages.cmake

@@ -90,7 +90,7 @@ if(WITH_JAVA)
   set(INST_DEFS ${INST_DEFS} -DJAVA)
 endif()
 
-if(MSVC_IDE)
+if(GENERATOR_IS_MULTI_CONFIG)
   set(INST_DEFS ${INST_DEFS} "-DBUILDDIR=${CMAKE_CFG_INTDIR}\\")
 else()
   set(INST_DEFS ${INST_DEFS} "-DBUILDDIR=")