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730aa1f6bc
There were some irregularities in the flags for handling NCZarr S3 support. The primary change is to regularize the flags controlling this to the following. 1. Automake: --enable-nczarr-s3 and CMake: ENABLE_NCZARR_S3 2. Automake: --enable-nczarr-s3-tests and CMake: ENABLE_NCZARR_S3_TESTS Flag 1 indicates that NCZarr should be built with S3 support enabled. Flag 2 indicates that the NCZarr S3 tests should be run These two flags are separate because running the NCZarr S3 tests requires access to protected S3 resources. Currently, running these tests is restricted to Unidata personnel. However, users may want to enable S3 support even if they cannot run the tests. It is, of course, an error to specify 2 without specifying 1. Additionally, if the AWS S3 SDK library is not found, then the NCZARR S3 support and testing must be disabled. Otherwise an error is signaled during the build. Some of these NCZarr and S3 changes are propagated to nc-config. Misc. Other Changes: 1. Allow testing for CYGWIN or MSVC in shell scripts. 2. Add specific test for HDF5 library version 1.10.6. This is encoded as "HDF5_UTF8_PATHS" because that is the first version where HDF5 properly supports it under Windows. This is used in hdf5internal/nc4_ndf5_ansi_to_utf8. 3. Add a AM Conditional -- AX_IGNORE -- for use in testing when it is desirable to temporarily suppress Makefile code. 4. Add MULTIFILTER flag to CMakeLists.txt