Wno-error=format-overflow needed onnewer gccs

[Jiri Vanek]

Hello!

For pretty long tim, on newer gcc default build fails as:

Compiling /home/jvanek/hg/jdk8u-dev/hotspot/src/share/vm/opto/parse3.cpp
/home/jvanek/hg/jdk8u-dev/hotspot/src/os/linux/vm/os_linux.cpp: In static member function ‘static void os::Linux::check_signal_handler(int)’:
/home/jvanek/hg/jdk8u-dev/hotspot/src/os/linux/vm/os_linux.cpp:4999:15: error: ‘%s’ directive argument is null [-Werror=format-overflow=]
  4999 |     tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
       |     ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Compiling /home/jvanek/hg/jdk8u-dev/hotspot/src/share/vm/opto/parseHelper.cpp
cc1plus: all warnings being treated as errors
gmake[6]: *** [/home/jvanek/hg/jdk8u-dev/hotspot/make/linux/makefiles/rules.make:151: os_linux.o] Error 1


You need to build as
make  WARNINGS_ARE_ERRORS="-Wno-error=format-overflow"


to make it works. I'm unabel to decide if the warning is valid. If it is, can you please fix it?
If not, I can make webrev and adding it to default set of hotspot's excluded warnings.

J.


If somebody is sitting on it right now, feel free to push on you own :)


the above exclusion is making the jdk to build:

make  WARNINGS_ARE_ERRORS="-Wno-error=format-overflow"
...


----- Build times -------
Start 2021-06-22 15:49:22
End   2021-06-22 15:51:05
00:00:00 corba
00:00:00 hotspot
00:00:00 jaxp
00:00:00 jaxws
00:01:43 jdk
00:00:00 langtools
00:01:43 TOTAL
-------------------------
Finished building OpenJDK for target 'default'



-- 
Jiri Vanek Mgr.
Principal QA Software Engineer
Red Hat Inc.
+420 775 39 01 09