File: README.CMake

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////
$Id$

Copyright (c) 1991-2019 by P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis
and F. Wobbe. See LICENSE.TXT file for copying and redistribution conditions.

Contact info: http://gmt.soest.hawaii.edu/
////

CMake User Guide
================

Note: This guide is also available at http://gmt.soest.hawaii.edu/

Package maintainers note packaging recommendations at
http://gmt.soest.hawaii.edu/projects/gmt/wiki/PackagingGMT

Build and runtime prerequisites
-------------------------------

1. Software:
  You need Ghostscript, CMake (>=2.8.5), netCDF (>=4.0, netCDF-4/HDF5
  support mandatory).  Optionally install Sphinx, PCRE1 or PCRE2, GDAL, LAPACK
  and FFTW (single precision version).
2. Data:
  You need gshhg (>=2.2.2); optionally install dcw-gmt (>=1.0.5)

Information for building GMT 5 with CMake
-----------------------------------------

Quick start:
~~~~~~~~~~~~

Checkout GMT5 from its subversion repository:

  $ svn co svn://gmtserver.soest.hawaii.edu/gmt5/trunk gmt5-dev
  $ cd gmt5-dev
  $ cp cmake/ConfigUserTemplate.cmake cmake/ConfigUser.cmake

Edit *cmake/ConfigUser.cmake* [see comments in the file]. Then:

  $ mkdir build
  $ cd build
  $ cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
  $ make -jx

where _x_ is the number of threads you want to use and depends on the number
of cores in your CPU and if hyperthreading is available or not.
cmake ill build out-of-source in the the directory _build_. 'CMAKE_BUILD_TYPE'
can be one of: empty, Debug, Release, RelWithDebInfo or MinSizeRel

  $ make -jx install

installs a basic gmt in _build/gmt5_.

NOTE: All cmake command line options such as _-DCMAKE_INSTALL_PREFIX_ can be
configured in *cmake/ConfigUser.cmake*.

In more detail:
~~~~~~~~~~~~~~~

For CMake related questions refer to the CMake manual which is available
online: http://www.cmake.org/cmake/help/documentation.html

To avoid CMake's lengthy command line options you can create your custom
ConfigUser.cmake file in the cmake directory. Simply duplicate the
cmake/ConfigUserTemplate.cmake to cmake/ConfigUser.cmake and then make
changes in cmake/ConfigUser.cmake. See additional comments in that file.

There are two configuration files:

1. "ConfigDefault.cmake" -- is version controlled and used to add new default
    variables and set defaults for everyone. You should not edit this file.
2. "ConfigUser.cmake" -- is not version controlled (currently listed in
    svn:ignore property) and used to override defaults on a per-user basis.
    There is a template file, ConfigUserTemplate.cmake, that you should copy
    to ConfigUser.cmake and make your changes therein.

NOTE: If you want to change CMake behaviour for your build then only modify
      the "ConfigUser.cmake" file (not "ConfigDefault.cmake").

Invoking CMake:
~~~~~~~~~~~~~~~

CMake supports out-of-source builds and puts generated files in a completely
separate directory, so that the source tree is unchanged. Trying to run CMake
in the source tree will result in an error. CMake will first check for the
minimal required version and then search for required and optional libraries
(netCDF, CURL, PCRE, GDAL, LAPACK) in the default locations. The configuration
step will fail if dependencies are not met. You have to ensure that CMake can
find the required resources by configuring *cmake/ConfigUser.cmake*.

Finding GSHHG:
~~~~~~~~~~~~~~

GSHHG shorelines are searched in FindGSHHG.cmake and a little helper program
tests the version (gshhg_version.c). If CMake cannot find the shorelines you
have to configure _GSHHG_ROOT_ in cmake/ConfigUser.cmake.

Finding DCW:
~~~~~~~~~~~~~~

DCW (Digital Chart of the World) country polygons are searched at compile time.
The DCW data are optional; they are currently used in pscoast -E for painting
individual countries only.  If CMake cannot auto-find DCW for you then you can
configure _DCW_ROOT_ in cmake/ConfigUser.cmake.

Documentation:
~~~~~~~~~~~~~~

The GMT manual is available in different formats and can be generated with:

  $ make -jx docs_man        # UNIX manual pages
  $ make -jx docs_html       # HTML manual, cookbook, and API reference
  $ make -jx docs_pdf        # PDF manual, cookbook, and API reference
  $ make -jx docs_pdf_shrink # Like docs_pdf but with reduced size

To generate the documentation you need to install the Sphinx documentation
builder, and for PDFs you also need LaTeX.  You can choose to install the
documentation files from an external location instead of generating the
Manpages, PDF, and HTML files from the sources.  This is convenient if Sphinx
and/or LaTeX are not available.  Set GMT_INSTALL_EXTERNAL_DOC in
cmake/ConfigUser.cmake.

Installing:
~~~~~~~~~~~

  $ make -jx install

will compile and install libps, libgmt, and the gmt executable. Optionally it
will install the GSHHG shorelines (if found), DCW (if found), UNIX manpages,
and HTML and PDF documentation.

You have to explicitly make the latter two beforehand or they will be omitted
during installation.  You have the choice between installing into a
traditional directory structure (_-DGMT_INSTALL_TRADITIONAL_FOLDERNAMES=ON_)
where everything goes into a common subdirectory or a distribution-like
installation (PREFIX/bin/gmtSUFFIX, PREFIX/lib/gmtSUFFIX/,
PREFIX/include/gmtSUFFIX/, PREFIX/share/gmtSUFFIX/,
PREFIX/share/doc/gmtSUFFIX/).

GMT is shipped as a single executable.  By default we also set "classic mode"
by installing convenience links for all GMT modules. New GMT users should set
GMT_INSTALL_MODULE_LINKS to FALSE in cmake/ConfigUser.cmake.

Updating:
~~~~~~~~~

Assuming you did not delete the build directory and that your current
working directory is the build directory this is just as simple as

  $ cd ..
  $ svn up
  $ cd -
  $ make -jx install

CMake will detect any changes to the source files and will automatically
reconfigure. If you deleted all files inside the build directory you have to
run cmake again manually.

Packaging:
~~~~~~~~~~

Currently, packaging with CPack works on MacOSX (Bundle, TGZ, TBZ2),
Windows (ZIP, NSIS), and UNIX (TGZ, TBZ2). On Windows you need to install NSIS
(http://nsis.sourceforge.net/). After building GMT and the documentation run
either one of these:

  $ make package
  $ cpack -G <TGZ|TBZ2|Bundle|ZIP|NSIS>

Creating a source package:
~~~~~~~~~~~~~~~~~~~~~~~~~~

Set GMT_RELEASE_PREFIX in cmake/ConfigUser.cmake and run cmake. Then do

  $ make -jx docs_depends # optional but increases speed (parallel build)
  $ make gmt_release      # export the source tree and install doc

You should then edit ${GMT_RELEASE_PREFIX}/cmake/ConfigDefault.cmake and
set GMT_PACKAGE_VERSION_MAJOR, GMT_PACKAGE_VERSION_MINOR, and
GMT_PACKAGE_VERSION_PATCH. Also uncomment and set
GMT_SOURCE_CODE_CONTROL_VERSION_STRING to the current svn version. Then
create tarballs with:

  $ make -jx gmt_release_tar

In-build-dir tests:
~~~~~~~~~~~~~~~~~~~

A complete set of the example scripts used to create all the example plots,
including all necessary data files, are provided by the installation.
Examples and tests can be build inside GMT_BINARY_DIR *without* installing.
This is very convenient for testing. Just _enable_testing()_, set
_DO_EXAMPLES_ and/or _DO_TESTS_ in ConfigUser.cmake and do:

  $ make -jx
  $ make check

Optionally set _N_TEST_JOBS_ to the number of ctest jobs to run
simultaneously. You can also select individual tests using regexp with ctest,
e.g.:

  $ ctest -R ex2[3-6]

Tests are preferably run through valgrind and GMT's internal memory tracker.
Configure cmake with _add_definitions(-DMEMDEBUG)_ and prior to invoking the
test, export the following variables:

  $ export GMT_TRACK_MEMORY=2
  $ export VALGRIND_ARGS="--track-origins=yes --leak-check=full"

The test script will keep gmt_memtrack_<pid>.log and valgrind_<pid>.log files
in the test directories for later inspection, when memory related errors were
identified.

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////