devel/freebsd-gcc6: Retire obsolete port.

Supported FreeBSD versions can no longer be built with GCC 6 and
users wishing to compile FreeBSD with GCC are encouraged to use
devel/freebsd-gcc9 or devel/freebsd-gcc12 instead.

Reviewed by:	manu, otis
Differential Revision:	https://reviews.freebsd.org/D39218

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

devel/freebsd-gcc6: fix PKGNAME

compiler: use CHOSEN_COMPILER_TYPE instead of COMPILER_TYPE

CHOSEN_COMPILER_TYPE is the only safe variable to let a port know which
typer of compiler has been elected to be used by the framework

PR: 	199098

devel/freebsd-gcc6: Add CPE information

Approved by:	portmgr (blanket)

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

Update to MPC version 1.2.0 with the following changes:
 - New functions:
   . mpc_sum
   . mpc_dot
 - Several functions are more robust with a reduced exponent range
   (for example corresponding to IEEE 754 binary formats).
 - New mpcheck tool for comparison with the native C library (which
   is not installed by default).

Bump all directly dependent ports. Do not bump those indirectly
dependent via the lang/gcc* family since their run-time dependencies
and code generated should not be affected.

PR:		249950
Submitted by:	wen

devel/freebsd-gcc6: fix build on powerpc64le

Same issue as other GCC ports.

Tidy the Makefiles for devel/freebsd-gcc*.  No functional change.

- Sort BUILD_DEPENDS before LIB_DEPENDS and RUN_DEPENDS.
- Quiet other warnings noted by portlint.
- Sort USES.

Requested by:   mat (1), lwhsu (3)
Reviewed by:	lwhsu
Differential Revision:	https://reviews.freebsd.org/D29072

Fix build of amd64-gcc6 and i386-gcc6 with LLVM 11.

clang errors when assigning NULL (nullptr) to a bool.

Reviewed by:	zeising
Differential Revision:	https://reviews.freebsd.org/D26222

Don't disable LTO for aarch64-gcc[69].

aarch64-binutils is no longer built static by default, so aarch64-gcc
can now enable LTO.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D25783

devel/freebsd-gcc*: add objdump dependency on devel/binutils

/usr/bin/objdump has been removed from the FreeBSD base system in advance
of FreeBSD 13.0.

Reported by:	antoine
Approved by:	bapt
Sponsored by:	The FreeBSD Foundation

devel/freebsd-gcc6: fix build on powerpc64 elfv2

Use the same patch that was committed for lang/gcc9 to fix build.

PR:		243933
Reported by:	jhb (maintainer)

Rename base/gcc to base/gcc6.

This is in preparation for adding a base/gcc9 port.

While here, update to GCC 6.5.0.

Share packing lists with the freebsd-gcc6 port as much as posible.
Split most of the freebsd-gcc6 pkg-plist into a pkg-plist.common that
lists arch-independent files under lib/.  Change base/gcc6 to use the
arch-specific packing lists and pkg-list.common from freebsd-gcc6.  In
addition, hook up packing lists for the remaining archs supported by
freebsd-gcc6 but not base/gcc6: aarch64 and sparc64.

Reviewed by:	bapt
Differential Revision:	https://reviews.freebsd.org/D22900

Update to GCC 6.5.0.

Take maintainership.

Reviewed by:	lwhsu
Differential Revision:	https://reviews.freebsd.org/D22506

Use per-architecture packing list files for architecture-specific files.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D22451

Add freebsd-gcc6 port.

This port is basically identical to the existing <arch>-gcc ports
that use GCC6.  However, it uses flavors for the different
architectures instead of slave ports.  It also includes the external
toolchain makefile and thus subsumes the <arch>-xtoolchain-gcc
port into the new packages.

This should permit us to have ports for different major versions of
GCC (e.g. a freebsd-gcc9 port).

aarch64-gcc6 disables LTO support to work with aaarch64-binutils
which builds a static ld.bfd binary by default which is unable to work
with LTO.

Reviewed by:	imp, brooks
Approved by:	portmgr (swills)
Differential Revision:	https://reviews.freebsd.org/D22147