Since commit 07223c5c27 (Tutorial: Update Step 5 to work on Windows,
2020-02-18, v3.18.0-rc1~655^2) the logic does not work on non-Windows
platforms when cmake is re-run on an existing build tree. It is also
more complicated than we'd like for a tutorial example. Avoid the need
to consider the `m` library case by performing the check as C++.
Since `check_cxx_symbol_exists` cannot handle overloaded functions
like `exp` and `log`, check with `check_cxx_source_compiles` instead.
This also presents a more general-purpose example in the tutorial.
Fixes: #23524
Provide readers following the tutorial on `cmake.org` a direct link to
download the tutorial's source examples. Previously readers had to
fetch the CMake source tree separately and look for the tutorial source
examples inside it.
Fixes: #22475
Divert LCC compiler as a new one, instead of treating it as GNU.
Since old times, Elbrus C/C++/Fortran Compiler (LCC) by MCST has been
passing checks for GNU compilers, so it has been identified as GNU.
Now, with intent of seriously upstreaming its support, it has been
added as a separate LCC compiler, and its version displays not a
supported GCC version, but LCC version itself (e.g. LCC 1.25.19 instead
of GNU 7.3.0).
This commit adds its support for detection, and also converts basically
every check like 'is this compiler GNU?' to 'is this compiler GNU or
LCC?'. The only places where this check is untouched, is where it
regards other platforms where LCC is unavailable (primarily non-Linux),
and where it REALLY differs from GNU compiler.
Note: this transition may break software that are already ported to
Elbrus, but hardly relies that LCC will be detected as GNU; still such
software is not known.
Small changes to the text and CMake code for the fourth step of the
tutorial:
* Remove parameter from endfunction call
* Standardize on "binary directory" for test location
* Add additional information about a Release build.
Issue: #22663
Add documentation for the configure_package_config_file() and
write_basic_package_version_file() commands.
Update the comment for the installation of those files to allow a
stopping point for the code display.
Issue: #22663
Add a copy of the CTestConfig.cmake from Step 9 into the directory for
Step 8.
Expand the information about the contents of the CTestConfig file and
write a brief explanation of where on CDash to acquire the CTestConfig
file for a specific project.
CMake Issue: #22663
Clarify that the process of making a target optional in the second step
of the tutorial is further steps to the work done before, not
a separate addition to the file.
Do this by ensuring that the paragraph which describes the work done
mentions the placement and use of the previous command.
This is done to avoid duplication of the add_subdirectory call.
CMake Issue: #22663
Extend the change from commit 9e5bbb69ea (Tutorial: Add captions for
code blocks, 2021-06-11) to also add a Sphinx named target to code
blocks. Name each target after the change the code block makes.
* Move sections to be same level as Introduction in "Using Dependecies"
* Rename "Importing Exporting Targets" to "Importing Exporting Guide"
* Add an Introduction header to the Tutorial and Importing Exporting Guide
In commit c754a3d4b7 (Tutorial: Remove MakeTable.cxx from Steps 5 and 6,
2020-04-23) it was incorrect to remove the file from step 6. The
instructions for that step show the addition of a reference to it from
the `CMakeLists.txt` file. Each step shows the addition of content to
lead to the next step, so removing the file from step 6 was an
off-by-one error.
Issue: #20618
