Update CMake code to 3.18 minimum version (#2080)

* Update CMake code to 3.18 minimum version

* Updated release note

1 files changed, 18 insertions, 60 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c73597..0a0e4ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.12)
+cmake_minimum_required (VERSION 3.18)
 project (HDF5 C)
 
 if (POLICY CMP0074)
@@ -39,16 +39,6 @@ if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
       )
 endif ()
 
-# CMake version 3.14 added option --ignore-eol to compare files
-#     cmake -E compare_files --ignore-eol file1 file2
-set (CMAKE_IGNORE_EOL "--ignore-eol")
-if (CMAKE_VERSION VERSION_LESS "3.14.0")
-  set (CMAKE_IGNORE_EOL "")
-  if (WIN32)
-    message (FATAL_ERROR "Windows builds require a minimum of CMake 3.14")
-  endif()
-endif ()
-
 #-----------------------------------------------------------------------------
 # Instructions for use : Sub-Project Build
 #
@@ -250,9 +240,7 @@ string (REGEX REPLACE ".*#define[ \t]+H5_VERS_RELEASE[ \t]+([0-9]*).*$"
     "\\1" H5_VERS_RELEASE ${_h5public_h_contents})
 string (REGEX REPLACE ".*#define[ \t]+H5_VERS_SUBRELEASE[ \t]+\"([0-9A-Za-z._-]*)\".*$"
     "\\1" H5_VERS_SUBRELEASE ${_h5public_h_contents})
-if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-  message (TRACE "VERSION: ${H5_VERS_MAJOR}.${H5_VERS_MINOR}.${H5_VERS_RELEASE}-${H5_VERS_SUBRELEASE}")
-endif ()
+message (TRACE "VERSION: ${H5_VERS_MAJOR}.${H5_VERS_MINOR}.${H5_VERS_RELEASE}-${H5_VERS_SUBRELEASE}")
 
 #-----------------------------------------------------------------------------
 # parse the full soversion number from config/lt_vers.am and include in H5_SOVERS_INFO
@@ -265,9 +253,7 @@ string (REGEX REPLACE ".*LT_VERS_REVISION[ \t]+=[ \t]+([0-9]*).*$"
 string (REGEX REPLACE ".*LT_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
     "\\1" H5_LIB_SOVERS_RELEASE ${_lt_vers_am_contents})
 math (EXPR H5_LIB_SOVERS_MAJOR ${H5_LIB_SOVERS_INTERFACE}-${H5_LIB_SOVERS_RELEASE})
-if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-  message (VERBOSE "SOVERSION: ${H5_LIB_SOVERS_MAJOR}.${H5_LIB_SOVERS_RELEASE}.${H5_LIB_SOVERS_MINOR}")
-endif ()
+message (VERBOSE "SOVERSION: ${H5_LIB_SOVERS_MAJOR}.${H5_LIB_SOVERS_RELEASE}.${H5_LIB_SOVERS_MINOR}")
 string (REGEX MATCH ".*LT_TOOLS_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$" H5_TOOLS_SOVERS_EXISTS ${_lt_vers_am_contents})
 if (H5_TOOLS_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_TOOLS_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$"
@@ -277,9 +263,7 @@ if (H5_TOOLS_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_TOOLS_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
       "\\1" H5_TOOLS_SOVERS_RELEASE ${_lt_vers_am_contents})
   math (EXPR H5_TOOLS_SOVERS_MAJOR ${H5_TOOLS_SOVERS_INTERFACE}-${H5_TOOLS_SOVERS_RELEASE})
-  if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-    message (VERBOSE "SOVERSION_TOOLS: ${H5_TOOLS_SOVERS_MAJOR}.${H5_TOOLS_SOVERS_RELEASE}.${H5_TOOLS_SOVERS_MINOR}")
-  endif ()
+  message (VERBOSE "SOVERSION_TOOLS: ${H5_TOOLS_SOVERS_MAJOR}.${H5_TOOLS_SOVERS_RELEASE}.${H5_TOOLS_SOVERS_MINOR}")
 endif ()
 string (REGEX MATCH ".*LT_CXX_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$" H5_CXX_SOVERS_EXISTS ${_lt_vers_am_contents})
 if (H5_CXX_SOVERS_EXISTS)
@@ -290,9 +274,7 @@ if (H5_CXX_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_CXX_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
       "\\1" H5_CXX_SOVERS_RELEASE ${_lt_vers_am_contents})
   math (EXPR H5_CXX_SOVERS_MAJOR ${H5_CXX_SOVERS_INTERFACE}-${H5_CXX_SOVERS_RELEASE})
-  if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-    message (VERBOSE "SOVERSION_CXX: ${H5_CXX_SOVERS_MAJOR}.${H5_CXX_SOVERS_RELEASE}.${H5_CXX_SOVERS_MINOR}")
-  endif ()
+  message (VERBOSE "SOVERSION_CXX: ${H5_CXX_SOVERS_MAJOR}.${H5_CXX_SOVERS_RELEASE}.${H5_CXX_SOVERS_MINOR}")
 endif ()
 string (REGEX MATCH ".*LT_F_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$" H5_F_SOVERS_EXISTS ${_lt_vers_am_contents})
 if (H5_F_SOVERS_EXISTS)
@@ -303,9 +285,7 @@ if (H5_F_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_F_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
       "\\1" H5_F_SOVERS_RELEASE ${_lt_vers_am_contents})
   math (EXPR H5_F_SOVERS_MAJOR ${H5_F_SOVERS_INTERFACE}-${H5_F_SOVERS_RELEASE})
-  if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-    message (VERBOSE "SOVERSION_F: ${H5_F_SOVERS_MAJOR}.${H5_F_SOVERS_RELEASE}.${H5_F_SOVERS_MINOR}")
-  endif ()
+  message (VERBOSE "SOVERSION_F: ${H5_F_SOVERS_MAJOR}.${H5_F_SOVERS_RELEASE}.${H5_F_SOVERS_MINOR}")
 endif ()
 string (REGEX MATCH ".*LT_HL_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$" H5_HL_SOVERS_EXISTS ${_lt_vers_am_contents})
 if (H5_HL_SOVERS_EXISTS)
@@ -316,9 +296,7 @@ if (H5_HL_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_HL_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
       "\\1" H5_HL_SOVERS_RELEASE ${_lt_vers_am_contents})
   math (EXPR H5_HL_SOVERS_MAJOR ${H5_HL_SOVERS_INTERFACE}-${H5_HL_SOVERS_RELEASE})
-  if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-    message (VERBOSE "SOVERSION_HL: ${H5_HL_SOVERS_MAJOR}.${H5_HL_SOVERS_RELEASE}.${H5_HL_SOVERS_MINOR}")
-  endif ()
+  message (VERBOSE "SOVERSION_HL: ${H5_HL_SOVERS_MAJOR}.${H5_HL_SOVERS_RELEASE}.${H5_HL_SOVERS_MINOR}")
 endif ()
 string (REGEX MATCH ".*LT_HL_CXX_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$" H5_HL_CXX_SOVERS_EXISTS ${_lt_vers_am_contents})
 if (H5_HL_CXX_SOVERS_EXISTS)
@@ -329,9 +307,7 @@ if (H5_HL_CXX_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_HL_CXX_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
       "\\1" H5_HL_CXX_SOVERS_RELEASE ${_lt_vers_am_contents})
   math (EXPR H5_HL_CXX_SOVERS_MAJOR ${H5_HL_CXX_SOVERS_INTERFACE}-${H5_HL_CXX_SOVERS_RELEASE})
-  if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-    message (VERBOSE "SOVERSION_HL_CXX: ${H5_HL_CXX_SOVERS_MAJOR}.${H5_HL_CXX_SOVERS_RELEASE}.${H5_HL_CXX_SOVERS_MINOR}")
-  endif ()
+  message (VERBOSE "SOVERSION_HL_CXX: ${H5_HL_CXX_SOVERS_MAJOR}.${H5_HL_CXX_SOVERS_RELEASE}.${H5_HL_CXX_SOVERS_MINOR}")
 endif ()
 string (REGEX MATCH ".*LT_HL_F_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$" H5_HL_F_SOVERS_EXISTS ${_lt_vers_am_contents})
 if (H5_HL_F_SOVERS_EXISTS)
@@ -342,9 +318,7 @@ if (H5_HL_F_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_HL_F_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
       "\\1" H5_HL_F_SOVERS_RELEASE ${_lt_vers_am_contents})
   math (EXPR H5_HL_F_SOVERS_MAJOR ${H5_HL_F_SOVERS_INTERFACE}-${H5_HL_F_SOVERS_RELEASE})
-  if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-    message (VERBOSE "SOVERSION_HL_F: ${H5_HL_F_SOVERS_MAJOR}.${H5_HL_F_SOVERS_RELEASE}.${H5_HL_F_SOVERS_MINOR}")
-  endif ()
+  message (VERBOSE "SOVERSION_HL_F: ${H5_HL_F_SOVERS_MAJOR}.${H5_HL_F_SOVERS_RELEASE}.${H5_HL_F_SOVERS_MINOR}")
 endif ()
 string (REGEX MATCH ".*LT_JAVA_VERS_INTERFACE[ \t]+=[ \t]+([0-9]*).*$" H5_JAVA_SOVERS_EXISTS ${_lt_vers_am_contents})
 if(H5_JAVA_SOVERS_EXISTS)
@@ -355,9 +329,7 @@ if(H5_JAVA_SOVERS_EXISTS)
   string (REGEX REPLACE ".*LT_JAVA_VERS_AGE[ \t]+=[ \t]+([0-9]*).*$"
       "\\1" H5_JAVA_SOVERS_RELEASE ${_lt_vers_am_contents})
   math (EXPR H5_JAVA_SOVERS_MAJOR ${H5_JAVA_SOVERS_INTERFACE}-${H5_JAVA_SOVERS_RELEASE})
-  if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-    message (VERBOSE "SOVERSION_JAVA: ${H5_JAVA_SOVERS_MAJOR}.${H5_JAVA_SOVERS_RELEASE}.${H5_JAVA_SOVERS_MINOR}")
-  endif ()
+  message (VERBOSE "SOVERSION_JAVA: ${H5_JAVA_SOVERS_MAJOR}.${H5_JAVA_SOVERS_RELEASE}.${H5_JAVA_SOVERS_MINOR}")
 endif ()
 
 #-----------------------------------------------------------------------------
@@ -880,42 +852,32 @@ option (HDF5_ENABLE_THREADSAFE "Enable thread-safety" OFF)
 if (HDF5_ENABLE_THREADSAFE)
   # check for unsupported options
   if (WIN32)
-    if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-      message (VERBOSE " **** thread-safety option not supported with static library **** ")
-      message (VERBOSE " **** thread-safety option will not be used building static library **** ")
-    endif ()
+    message (VERBOSE " **** thread-safety option not supported with static library **** ")
+    message (VERBOSE " **** thread-safety option will not be used building static library **** ")
   endif ()
   if (HDF5_BUILD_FORTRAN)
     if (NOT ALLOW_UNSUPPORTED)
       message (FATAL_ERROR " **** Fortran and thread-safety options are not supported, override with ALLOW_UNSUPPORTED option **** ")
     else ()
-      if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-        message (VERBOSE " **** Allowing unsupported Fortran and thread-safety options **** ")
-      endif ()
+      message (VERBOSE " **** Allowing unsupported Fortran and thread-safety options **** ")
     endif ()
   endif ()
   if (HDF5_BUILD_CPP_LIB)
     if (NOT ALLOW_UNSUPPORTED)
       message (FATAL_ERROR " **** C++ and thread-safety options are not supported, override with ALLOW_UNSUPPORTED option **** ")
     else ()
-      if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-        message (VERBOSE " **** Allowing unsupported C++ and thread-safety options **** ")
-      endif ()
+      message (VERBOSE " **** Allowing unsupported C++ and thread-safety options **** ")
     endif ()
   endif ()
   if (HDF5_BUILD_HL_LIB)
     if (NOT ALLOW_UNSUPPORTED)
       message (FATAL_ERROR " **** HL and thread-safety options are not supported, override with ALLOW_UNSUPPORTED option **** ")
     else ()
-      if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-        message (VERBOSE " **** Allowing unsupported HL and thread-safety options **** ")
-      endif ()
+      message (VERBOSE " **** Allowing unsupported HL and thread-safety options **** ")
     endif ()
   endif ()
   if (H5_HAVE_IOEO)
-    if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-      message (VERBOSE " **** Win32 threads requires WINVER>=0x600 (Windows Vista/7/8) **** ")
-    endif ()
+    message (VERBOSE " **** Win32 threads requires WINVER>=0x600 (Windows Vista/7/8) **** ")
     set (H5_HAVE_WIN_THREADS 1)
   else ()
     if (NOT H5_HAVE_PTHREAD_H)
@@ -1149,9 +1111,7 @@ if (EXISTS "${HDF5_SOURCE_DIR}/fortran" AND IS_DIRECTORY "${HDF5_SOURCE_DIR}/for
   if (HDF5_BUILD_FORTRAN)
     include (${HDF_RESOURCES_DIR}/HDFUseFortran.cmake)
 
-    if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-      message (VERBOSE "Fortran compiler ID is ${CMAKE_Fortran_COMPILER_ID}")
-    endif ()
+    message (VERBOSE "Fortran compiler ID is ${CMAKE_Fortran_COMPILER_ID}")
     include (${HDF_RESOURCES_DIR}/HDFFortranCompilerFlags.cmake)
     include (${HDF_RESOURCES_DIR}/HDF5UseFortran.cmake)
     set (LINK_Fortran_LIBS ${LINK_LIBS})
@@ -1200,9 +1160,7 @@ if (EXISTS "${HDF5_SOURCE_DIR}/c++" AND IS_DIRECTORY "${HDF5_SOURCE_DIR}/c++")
       if (NOT ALLOW_UNSUPPORTED)
         message (FATAL_ERROR " **** Parallel and C++ options are mutually exclusive, override with ALLOW_UNSUPPORTED option **** ")
       else ()
-        if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.15.0")
-          message (VERBOSE " **** Allowing unsupported Parallel and C++ options **** ")
-        endif ()
+        message (VERBOSE " **** Allowing unsupported Parallel and C++ options **** ")
       endif ()
     endif ()