netcdf-c/lib_flags.am
Dennis Heimbigner 49737888ca Improve S3 Documentation and Support
## Improvements to S3 Documentation
* Create a new document *quickstart_paths.md* that give a summary of the legal path formats used by netcdf-c. This includes both file paths and URL paths.
* Modify *nczarr.md* to remove most of the S3 related text.
* Move the S3 text from *nczarr.md* to a new document *cloud.md*.
* Add some S3-related text to the *byterange.md* document.

Hopefully, this will make it easier for users to find the information they want.

## Rebuild NCZarr Testing
In order to avoid problems with running make check in parallel, two changes were made:
1. The *nczarr_test* test system was rebuilt. Now, for each test.
any generated files are kept in a test-specific directory, isolated
from all other test executions.
2. Similarly, since the S3 test bucket is shared, any generated S3 objects
are isolated using a test-specific key path.

## Other S3 Related Changes
* Add code to ensure that files created on S3 are reclaimed at end of testing.
* Used the bash "trap" command to ensure S3 cleanup even if the test fails.
* Cleanup the S3 related configure.ac flag set since S3 is used in several places. So now one should use the option *--enable-s3* instead of *--enable-nczarr-s3*, although the latter is still kept as a deprecated alias for the former.
* Get some of the github actions yml to work with S3; required fixing various test scripts adding a secret to access the Unidata S3 bucket.
* Cleanup S3 portion of libnetcdf.settings.in and netcdf_meta.h.in and test_common.in.
* Merge partial S3 support into dhttp.c.
* Create an experimental s3 access library especially for use with Windows. It is enabled by using the options *--enable-s3-internal* (automake) or *-DENABLE_S3_INTERNAL=ON* (CMake). Also add a unit-test for it.
* Move some definitions from ncrc.h to ncs3sdk.h

## Other Changes
* Provide a default implementation of strlcpy and move this and similar defaults into *dmissing.c*.
2023-04-25 17:15:06 -06:00

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# This is part of the netCDF package.
# Copyright 2018 University Corporation for Atmospheric Research/Unidata
# See COPYRIGHT file for conditions of use.
#
# Assemble the CPPFLAGS and LDFLAGS that point to all the needed
# libraries for netCDF-4.
#
AM_CPPFLAGS = -I$(top_builddir)/include -I$(top_srcdir)/include
AM_LDFLAGS =
if USE_DAP
AM_CPPFLAGS += -I${top_srcdir}/oc2
endif
if ENABLE_NCZARR
AM_CPPFLAGS += -I${top_srcdir}/libnczarr
endif
if ENABLE_S3_AWS
AM_LDFLAGS += -lstdc++
endif
if ! ENABLE_LIBXML2
# => tinyxml2
AM_LDFLAGS += -lstdc++
endif
AM_TESTS_ENVIRONMENT = export TOPSRCDIR=${abs_top_srcdir}; export TOPBUILDDIR=${abs_top_builddir};