From fc5c567fdce94765c9db904295ca8879a8e91752 Mon Sep 17 00:00:00 2001
From: Dana Robinson <43805+derobins@users.noreply.github.com>
Date: Tue, 20 Apr 2021 04:55:05 -0700
Subject: CMake no longer builds the C++ library by default (#555)

* Committing clang-format changes

* CMake no longer builds C++ library by default

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
---
 CMakeLists.txt                 | 2 +-
 config/cmake/cacheinit.cmake   | 2 ++
 release_docs/INSTALL_CMake.txt | 2 +-
 release_docs/RELEASE.txt       | 7 +++++++
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0771ac6..306f701 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1106,7 +1106,7 @@ endif ()
 # Option to build HDF5 C++ Library
 #-----------------------------------------------------------------------------
 if (EXISTS "${HDF5_SOURCE_DIR}/c++" AND IS_DIRECTORY "${HDF5_SOURCE_DIR}/c++")
-  option (HDF5_BUILD_CPP_LIB  "Build HDF5 C++ Library" ON)
+  option (HDF5_BUILD_CPP_LIB  "Build HDF5 C++ Library" OFF)
   if (HDF5_BUILD_CPP_LIB)
     # check for unsupported options
     if (HDF5_ENABLE_PARALLEL)
diff --git a/config/cmake/cacheinit.cmake b/config/cmake/cacheinit.cmake
index fc85277..e423deb 100644
--- a/config/cmake/cacheinit.cmake
+++ b/config/cmake/cacheinit.cmake
@@ -21,6 +21,8 @@ set (HDF_PACKAGE_EXT "" CACHE STRING "Name of HDF package extension" FORCE)
 
 set (HDF_PACKAGE_NAMESPACE "hdf5::" CACHE STRING "Name for HDF package namespace (can be empty)" FORCE)
 
+set (HDF5_BUILD_CPP_LIB ON CACHE BOOL "Build C++ support" FORCE)
+
 set (HDF5_BUILD_FORTRAN ON CACHE BOOL "Build FORTRAN support" FORCE)
 
 set (HDF5_INSTALL_MOD_FORTRAN "NO" CACHE STRING "Copy FORTRAN mod files to include directory (NO SHARED STATIC)" FORCE)
diff --git a/release_docs/INSTALL_CMake.txt b/release_docs/INSTALL_CMake.txt
index f42f780..6f30f45 100644
--- a/release_docs/INSTALL_CMake.txt
+++ b/release_docs/INSTALL_CMake.txt
@@ -734,7 +734,7 @@ BUILD_STATIC_EXECS "Build Static Executables"  OFF
 BUILD_TESTING      "Build HDF5 Unit Testing"   ON
 
 ---------------- HDF5 Build Options ---------------------
-HDF5_BUILD_CPP_LIB  "Build HDF5 C++ Library"         ON
+HDF5_BUILD_CPP_LIB  "Build HDF5 C++ Library"         OFF
 HDF5_BUILD_EXAMPLES "Build HDF5 Library Examples"    ON
 HDF5_BUILD_FORTRAN  "Build FORTRAN support"          OFF
 HDF5_BUILD_JAVA     "Build JAVA support"             OFF
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index edf39f8..359f222 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -49,6 +49,13 @@ New Features
 
     Configuration:
     -------------
+    - CMake no longer builds the C++ library by default
+
+      HDF5_BUILD_CPP_LIB now defaults to OFF, which is in line with the
+      Autotools build defaults.
+
+      (DER - 2021/04/20)
+
     - Removal of pre-VS2015 work-arounds
 
       HDF5 now requires Visual Studio 2015 or greater, so old work-around
-- 
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