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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Feedback for a malloc implementation
Date: Wed, 20 Jul 2016 09:28:48 -0700
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Tim Rentsch <txr@alumni.caltech.edu> writes:
[...]
> I followed your directions and checked out the distribution
> branch.  No problem running cmake.  But then the make failed.
> Here is the first error message (please excuse my wrapping the
> long lines):
>
>     [ 21%] Building CXX object test/CMakeFiles/tMallocPerfRef.dir/tMallocPerf.cpp.o
>     In file included from /usr/include/c++/4.8/thread:35:0,
>                      from /opt/software/git/akmalloc/test/tMallocPerf.cpp:307:
>     /usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error:  #error This file 
>       requires compiler and library support for the ISO\
>     C++ 2011 standard. This support is currently experimental, and must be
>       enabled with the -std=c++11 or -std=gnu++11 compi\
>     ler options.
>      #error This file requires compiler and library support for the \
>       ^

(This is arguably off-topic, but ...)

The versions of C and C++ supported by gcc and g++ by default have
changed with recent releases.  With the 4.8 version you're using,
the defaults are -std=gnu90 and -std=gnu++98.  gcc release 5 (I
checked 5.3.0) changed the default for C to -std=gnu11, and release 6
(I checked 6.1.0) changed the default for C++ to -std=gnu++14.

It's likely that you wouldn't encounter the above error if you used
gcc release 6 (you'd probably have to install it yourself).

The Makefile (and/or whatever cmake uses) should be updated to
specify the standard to use by passing the proper option to the
gcc and g++ commands.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"