[Bug 208538] www/firefox 45 fails to build with -pie on lang/gcc after r410748

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208538

--- Comment #5 from russo at bogodyn.org ---
Attempts to make firefox compile with gcc5 without globally setting
DEFAULT_VERSIONS= gcc=5 in /etc/make.conf failed.  This was my preferred
course, to avoid having to rebuild with gcc5 a lot of libraries that are used
in the course of software development on this system.  

I tried putting USE_GCC=4.9+ in a /usr/local/etc/pkgtools.conf rule, but
portupgrade failed --- the port continued to use gcc48.  
  MAKE_ENV = {
    'firefox-*' => 'USE_GCC=4.9+',
  }


I tried building with "USE_GCC=4.9+" directly on a make command line in
/usr/ports/www/firefox, but got an error message about string comparison error
on line 130 of bsd.gcc.mk, which is supposed to be doing a numeric comparison. 
Same happened if I just used USE_GCC=5. 

I also tried just editing the Makefile in /usr/ports/www/firefox to add
USE_GCC=5, and it gave the same error message (not surprisingly).

The only thing that worked was DEFAULT_VERSIONS= gcc=5 in /etc/make.conf (or
commenting out FAVORITE_COMPILER=gcc), as you recommend in comment 2.

Since I can defer having to upgrade the various libraries I need for
development for a while, and then upgrade all of them to build with gcc 5 when
one of them forces me to upgrade (or otherwise play games with /etc/make.conf),
I can live with this for now.

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