Several tests specify use of C++98 mode since commit b0f277db38 (HP aCC:
record compiler flag for Ansi C++98 support for version 3.80 onwards,
2014-04-15, v3.1.0-rc1~550^2). The motivating use case for those
changes was dropped by commit 49640d3629 (HP-UX: Drop support for
building CMake on HP-UX, 2017-08-04, v3.10.0-rc1~304^2), so remove the
use of C++98 mode too. Also remove code that, on some compilers, used
C++11 instead of C++98, because we can now just use their default mode.
Since commit ddcd1469e8 (MSYS: Add support for running under MSYS
runtime environment, 2021-04-01) the test uses `std::size_t` without
including `<cstddef>`. Also, the type does not exist under `std::`
on VS 6. Use just `size_t` instead.
Since commit d44c0db0b2 (clang: setup correct configuration in gnu mode,
2019-02-20, v3.15.0-rc1~41^2~5) we support the GNU-like Clang that
targets the MSVC ABI. However, Clang cannot compile with the MSVC
standard library unless it runs in a mode aware of C++14 (since MSVC
itself does not even have a lower mode). When `CMAKE_CXX_STANDARD` is
set to 98 or 11, use C++14 anyway.
Since Clang's default mode is aware of C++14, another option is to not
add any flags for 98 or 11. However, if a future Clang version ever
defaults to a higher C++ standard, setting the standard to 98 or 11
should at least not use a mode higher than 14.
Also revert test updates from commit 4819ff9647 (Tests: fix failures
with gnu mode clang on windows, 2019-03-21, v3.15.0-rc1~41^2~3) that
were meant to work around the standard selection problem.
Fixes: #19496
Root causes were:
* Using incorrect conditions (assuming MSVC-like command line mode)
* Trying to compile the MSVC STL in C++11 mode, when parts of it require
C++14 or enabling MS extensions in clang.
* Missing flush in a testcase using stdout in a dll and a main part
with static crt
Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`. Use `clang-format` version 6.0.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Update `.clang-format` with configuration to make the 6.0 format as
close as possible to what 3.8 produced before. Then revise the style:
* Indent preprocessor directives (a feature new since 3.8)
* Add a newline and indentation before inheritance `:` and `,`
Rename the Git attribute identifying the format to include the
clang-format version number: `format.clang-format-6.0`. This will aid
external infrastructure in knowing what version of the tool to run.
Revise the logic from commit v3.7.0-rc1~173^2~2 (GNU: Do not use
-fvisibility on AIX or HP-UX, 2016-09-03) to add a version check.
The GCC 7 release notes [1] state that visibility support has been
added for AIX 7.1 and above.
[1] https://gcc.gnu.org/gcc-7/changes.html
CMake will soon require both C++11 and libuv to build. Neither of
these works on HP-UX, so unfortunately we need to drop support for
the platform until someone can get them working.
Issue: #17137
The `_EXPORT` and `_NO_EXPORT` macros should always be made properly
because the `<LANG>_VISIBILITY_PRESET` properties are controlled
independently of this module.
One case where this breaks compatibility is where a project was setting
`USE_COMPILER_HIDDEN_VISIBILITY=OFF` and then marking a symbol used
outside of the library with `_NO_EXPORT` which is a contridiction.
Refactor the library code used in the GenerateExportHeader test to use
an improved naming convention that more directly identifies what it
being tested, making use of namespaces to avoid possible symbol
collisions. This also eliminates duplicate cases such as `libshared()`
and `libshared_not_exported()` which had the same decoration, and adds
consistent pairings of <name>_EXPORT and <name>_DEPRECATED_EXPORT which
were missing previously. The data tests from the previous commit are
also added to `libstatic` and `libshared_and_static` for consistency.
Note that there are no exported members of exported classes, as these
are not allowed on Windows.
Add static data members and global variables to the GenerateExportHeader
shared library, testing that export decoration for these works in
addition to decoration of classes and free functions.
Modify notation of statements in the GenerateExportHeader test expected
to result in link errors. Modify script used to build the test to also
generate a suite of modified sources, each having exactly one of the
failing lines enabled, and to generate EXCLUDE_FROM_ALL executables for
the same. Modify RunCMake script used to drive the test to read the list
of such executables and try to build each of them, verifying that they
do in fact fail to build.
This will verify that the _NO_EXPORT macros are working as expected, and
will also catch errors like the one that commit 0cbaaf2d
(GenerateExportHeader: Fix add_compiler_export_flags regression,
2016-09-01) fixed.
When setting up the failure tests for GenerateExportHeader, check if the
compiler actually hides non-exported stuff. If not, the failure tests
won't fail, and will cause the overall test to fail. Since this
typically is only the case for very old compilers, simply skipping them
as opposed to trying to do something more fine grained seems reasonably
safe.
