gcc issues when compiling ArcticFox browser

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi All,

I am working hard on the ArcticFox browser (a Palemoon 27 fork, a 
derivative of FireFox) which has the old FF user interface which is much 
snappier and also useful on older machines. Also it contains precious 
endianness fixes, for people liking to use it on big Endian processors, 
like PowerPC (never attempted SPARC or MIPS-be).

A status summary on Linux: compiles quite fine with gcc up to 6.5 and 
runs well, specific backports were done to upgrade the code, while 
maintaining compatibility with older gcc versions.

On NetBSD I got it working too: on NetBSD 8.0 using the system compiler 
gcc 5.5 it just compiles and runs (except that it needs paxctl +m) ! Yay!

When I compile it on NetBSD "current" it compiles with gcc 7, however it 
crashes at startup. Maybe it is the too new compiler, there could be 
optimizations interfering.
I thus tried with gcc 6.5 from pkgs, but I get missing types (as I pate 
later). Before NetBSD-current upgraded to gcc 7, I could use gcc 6 "from 
system" so I wonder


Thus I tried using gcc 6.5 on NetBSD 8.0 (so on a "known" good OS) and 
get issues.
I suppose an issue with the compiler from pkg?


The errors I get on NetBSD 8.0 (which works with gcc 5.5) and gcc 6.5 
(which works on debian) are:


29:44.76 generating dependency information for 
/home/multix/code/Arctic-Fox/intl/icu/source/common/umath.c
29:44.81 generating dependency information for 
/home/multix/code/Arctic-Fox/intl/icu/source/common/putil.cpp
29:44.96 generating dependency information for 
/home/multix/code/Arctic-Fox/intl/icu/source/common/errorcode.cpp
29:45.03 generating ../common/svchook.mk
29:45.13 config.status: creating common/Makefile
29:45.69 In file included from /usr/pkg/gcc6/include/c++/math.h:36:0,
29:45.69                  from 
/home/multix/code/Arctic-Fox/intl/icu/source/common/putil.cpp:63:
29:45.69 /usr/pkg/gcc6/include/c++/cmath:1101:11: error: '::double_t' 
has not been declared
29:45.69    using ::double_t;
29:45.69            ^~~~~~~~
29:45.69 /usr/pkg/gcc6/include/c++/cmath:1102:11: error: '::float_t' has 
not been declared
29:45.69    using ::float_t;
29:45.69            ^~~~~~~
29:45.69 /usr/pkg/gcc6/include/c++/cmath:1121:11: error: '::copysign' 
has not been declared
29:45.69    using ::copysign;
29:45.69            ^~~~~~~~
29:45.69 /usr/pkg/gcc6/include/c++/cmath:1229:11: error: '::scalbln' has 
not been declared
29:45.69    using ::scalbln;
29:45.69            ^~~~~~~
29:45.69 /usr/pkg/gcc6/include/c++/cmath:1233:11: error: '::scalbn' has 
not been declared
29:45.69    using ::scalbn;
29:45.69            ^~~~~~
29:45.77 gmake[7]: *** 
[/home/multix/code/Arctic-Fox/intl/icu/source/config/mh-bsd-gcc:45: 
putil.o] Error 1
29:45.77 gmake[6]: *** [Makefile:147: all-recursive] Error 2


Any ideas/clues? I can't tell if this is a gcc header issue or codebase.

Thanks,
Riccardo