set default H5CPP_WITH_BOOST to OFf (#672)

Author: jkotan

CMakeLists.txt

@@ -80,7 +80,7 @@ include(DoxygenUtilities)
 #=============================================================================
 # compiler and library configuration
 #=============================================================================
-option(H5CPP_WITH_BOOST "enable Boost filesystem support" ON)
+option(H5CPP_WITH_BOOST "enable Boost filesystem support" OFF)
 if(H5CPP_WITH_BOOST)
   find_package(Boost 1.41 COMPONENTS filesystem system REQUIRED)
 else()

README.md

@@ -74,7 +74,7 @@ The minimum requirements for building the library are:
 * a C++ compiler, gcc>=4.9 should do well
 * the HDF5 C library (>=1.8.13 would do but >=1.10.0 is prefered)
 * cmake >= 3.10
-* _either_ the boost libraries _or_ a compiler with std::filesystem or std::experimental::filesystem (and specify H5CPP_WITH_BOOST=OFF to CMake)
+* _either_ a compiler with std::filesystem or std::experimental::filesystem  _or_ the boost libraries (and specify H5CPP_WITH_BOOST=ON to CMake)
 * [sphinx](http://www.sphinx-doc.org/en/stable/), [breathe](https://github.com/michaeljones/breathe) (with python) and  [doxygen](https://www.doxygen.nl/index.html) for the documentation build
 * [catch2](https://github.com/catchorg/catch2) to build the unit tests
 

doc/source/users_guide/installing.rst

@@ -72,8 +72,9 @@ which should do the job provided that all dependencies are installed in
 standard locations. We strongly recommend to set the particular build 
 configuration with the :envvar:`CMAKE_BUILD_TYPE` variable.
 
-To attempt to build without Boost, additionally specify `-DH5CPP_WITH_BOOST=OFF`.
-This requires a recent compiler, for example gcc >8, with filesystem in
+To attempt to build with Boost, additionally specify `-DH5CPP_WITH_BOOST=ON`.
+The default `-DH5CPP_WITH_BOOST=OFF`
+requires a recent compiler, for example gcc >8, with filesystem in
 the std or std::experimental namespace.
 
 On a Linux system the default build system used is 

ide/vscode/cmake-variants.yaml

@@ -27,7 +27,7 @@ mpi:
         H5CPP_WITH_MPI: ON
 
 filesystem:
-  default: boostfs
+  default: stdfs
   description: implementation of the filesystem namespace
   choices:
     boostfs: