CMake: Minor improvements

CMakeLists.txt

@@ -1,11 +1,11 @@
 cmake_minimum_required (VERSION 3.0)
 
+project (fftw VERSION 3.3.10 LANGUAGES C)
+
 if (NOT DEFINED CMAKE_BUILD_TYPE)
   set (CMAKE_BUILD_TYPE Release CACHE STRING "Build type")
 endif ()
 
-project (fftw)
-
 if (POLICY CMP0042)
   cmake_policy (SET CMP0042 NEW)
 endif ()
@@ -279,8 +279,6 @@ if (HAVE_AVX2)
   list (APPEND SOURCEFILES ${fftw_dft_simd_avx2_SOURCE} ${fftw_rdft_simd_avx2_SOURCE})
 endif ()
 
-set (FFTW_VERSION 3.3.10)
-
 set (PREC_SUFFIX)
 if (ENABLE_FLOAT)
   set (FFTW_SINGLE TRUE)
@@ -370,7 +368,7 @@ if (OPENMP_FOUND)
 endif ()
 
 foreach(subtarget ${subtargets})
-  set_target_properties (${subtarget} PROPERTIES SOVERSION 3.6.9 VERSION 3)
+  set_target_properties (${subtarget} PROPERTIES VERSION ${PROJECT_VERSION} SOVERSION ${PROJECT_VERSION_MAJOR})
   install (TARGETS ${subtarget}
 	  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
 	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
@@ -424,7 +422,7 @@ set (prefix ${CMAKE_INSTALL_PREFIX})
 set (exec_prefix ${CMAKE_INSTALL_PREFIX})
 set (libdir ${CMAKE_INSTALL_FULL_LIBDIR})
 set (includedir ${CMAKE_INSTALL_FULL_INCLUDEDIR})
-set (VERSION ${FFTW_VERSION})
+set (VERSION ${PROJECT_VERSION})
 configure_file (fftw.pc.in fftw3${PREC_SUFFIX}.pc @ONLY)
 install (FILES
           ${CMAKE_CURRENT_BINARY_DIR}/fftw3${PREC_SUFFIX}.pc