Re: Compiling EPICS 3.14.12.5 with GCC 6

[Bob Soliday <soliday@anl.gov>]

You can get it to compile with gcc 6.1 if you edit 
epicsExceptionTest.cpp and remove the "const" from the line:
static const size_t unsuccessfulNewSize = numeric_limits < size_t > :: max ();

There is a change committed to the for the next release, but it checks 
the version of gcc. It probably should check which -std option was given 
instead.
--Bob Soliday

On 06/28/2016 04:00 AM, Luca Cavalli wrote:
> Dear all,
>
> on my office laptop I'm running Fedora 24, which comes with GCC 6 by
> default.
>
> It seems that compiling EPICS 3.14.12.5 with GCC 6 fails here:
>
> /usr/bin/g++ -c  -D_GNU_SOURCE -D_DEFAULT_SOURCE            -
> D_X86_64_  -DUNIX  -Dlinux     -O3 -g   -Wall       -m64      -MMD -I.
> -I../O.Common -I. -I.. -I../../../../include/os/Linux
> -I../../../../include         ../epicsExceptionTest.cpp
> ../epicsExceptionTest.cpp: In function ‘void
> epicsExceptionTestPrivate()’:
> ../epicsExceptionTest.cpp:68:49: error: size of array is too large
>           char * p = new char [unsuccessfulNewSize];
>                                                   ^
> ../epicsExceptionTest.cpp:79:38: error: size of array is too large
>               char [unsuccessfulNewSize];
>                                        ^
> ../../../../configure/RULES_BUILD:218: recipe for target
> 'epicsExceptionTest.o' failed
>
> GCC 6 defaults to -std=gnu++14 instead of -std=gnu++98 [1]. Adding this
> option to compiler command seems to fix the problem, but which is the
> best place to set the desired standard?
>
> I tried in config/CONFIG_COMMON modifying:
>
> POSIX_CPPFLAGS += $(POSIX_CPPFLAGS_$(POSIX)) -std=gnu++98
>
> or:
>
> USR_CXXFLAGS = -std=gnu++98
>
> but the option seems to be ignored.
>
>
> Thanks for your help.
>
> Cheers,
>
> Luca
>
>
> [1] - https://gcc.gnu.org/gcc-6/porting_to.html#gxx14
>
>
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