Experimental Physics and
Industrial Control System

Bob Soliday <[email protected]> · Tue, 28 Jun 2016 09:12:19 -0500

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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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System