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A user just reported that 0.79 doesn't build out of the box on Ubuntu 14.04 (trusty), because although its gcc (4.8.4) does _support_ C99, it doesn't enable it without a non-default -std option. The user was able to work around the problem by defining CMAKE_C_FLAGS=-std=gnu99, but it would have been nicer if we'd done that automatically. Setting CMAKE_C_STANDARD causes cmake to do so. (This isn't a regression of 0.79 over 0.78 as far as I know; the user in question said they had last built 0.76.) I was surprised to find Ubuntu 14.04 still in use at all, but a quick web search revealed that its support has been extended until next year, so fair enough, I suppose. It's also running a cmake way older than we support, but apparently that can be worked around via Kitware's binary tarball downloads (which do still run on 14.04). This is a bit unsatisfactory: I'd prefer to ask for C standards support of _at least_ C99 level, and C11 if possible. Then I could test for the presence of C11 features via check_c_source_compiles, and use them opportunistically (e.g. in macro definitions). But as far as I can see, cmake has no built-in support for asking for a standards level of 'as new as you can get, but no older than 99'. Oh well. (In any case, the thing I'd find most useful from C11 is _Generic, and since that's in implementation namespace, compilers can - and do - support it in C99 mode anyway. So it's probably fine, at least for now.) (cherry picked from commit bd27962cd93a7ebb0098c0d6577b5d7340c7424a)
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Then, to install in the simplest way on Linux or Mac:
cmake --build . --target install
On Unix, pterm would like to be setuid or setgid, as appropriate, to
permit it to write records of user logins to /var/run/utmp and
/var/log/wtmp. (Of course it will not use this privilege for
anything else, and in particular it will drop all privileges before
starting up complex subsystems like GTK.) The cmake install step
doesn't attempt to add these privileges, so if you want user login
recording to work, you should manually ch{own,grp} and chmod the
pterm binary yourself after installation. If you don't do this,
pterm will still work, but not update the user login databases.
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory. If you aren't using one of our source snapshots,
you'll need to do this yourself. Halibut can be found at
<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.