gcc80: Fix manual page links for the primary compiler.

Taken-from: zrj

gcc80: Clean up two Makefiles a bit (no functional change).

Based-on: zrj's work

More gcc80 adjustments.

Nothing spectacular.

Taken-from: zrj

World - Change default compiler from gcc-5 to gcc-8

* Change the default compiler from gcc-5 to gcc-8.
gcc-5 will no longer be built by default. Setting
WORLD_ALTCOMPILER=all will build all thr

World - Change default compiler from gcc-5 to gcc-8

* Change the default compiler from gcc-5 to gcc-8.
gcc-5 will no longer be built by default. Setting
WORLD_ALTCOMPILER=all will build all three as before.

* Create CC hardlink for gcc80 so dports picks it up.
gcc80 is now the default for dports instead of 50.

* Adjust the Makefile's to make things easier the next time,
though they could still use more work.

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lvm(8): Do not build readline support for the rescue version

Make use of the RESCUE make variable to not build the readline support
for its rescue version (to be installed at /rescue).

Clean up the

lvm(8): Do not build readline support for the rescue version

Make use of the RESCUE make variable to not build the readline support
for its rescue version (to be installed at /rescue).

Clean up the Makefile.

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cryptsetup(8): Tidy up Makefile

diffutils: Reconfigure and revert some obsolete local changes.

Our wcwidth() is by now capable of handling UTF-8 so revert the
changes from d76863bd1dbf9c1e4c04a977e3a7271a23cdb718.

While here, rem

diffutils: Reconfigure and revert some obsolete local changes.

Our wcwidth() is by now capable of handling UTF-8 so revert the
changes from d76863bd1dbf9c1e4c04a977e3a7271a23cdb718.

While here, remove two more files from libdiffutils' Makefile.

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rcs: Clean up the Makefiles.

* Close the Makefile.inc chain to gnu/usr.bin/Makefile.inc.

* Use the SCRIPTS variable instead of using afterinstall.

strip(1): Perform safe install.

Pass -S flag to install(1) as it is currently done for /bin/sh.
The install(1) might call strip(1) on itself when installing.

buildworld: Add support to skip toolchain if requested.

These two new features are mainly aimed at developers, to speed up their
rebuilds on development branches. Often there are no changes that wou

buildworld: Add support to skip toolchain if requested.

These two new features are mainly aimed at developers, to speed up their
rebuilds on development branches. Often there are no changes that would
influence the toolchain components in any way. So it is reasonable to
skip rebuild of certain parts (mostly to avoid building c++ sources).

Previously we were rebuilding both main and alternative compilers twice
during buildworld for a full bootstrap that allowed us to avoid certain
breakages and not to keep adding lots of backwards compatibility hacks.

The new additions:
* -DNO_CROSSTOOLS - skip compiler and binutils bootstrap;
* -DNO_TOOLCHAINS - do not build compilers/binutils for installworld.

Both features are aimed for testing DESTDIR targets. Decision to
activate any of these features is left to the user's own discretion
based on reviewing the commits to the git repository or local clone.

The NO_CROSSTOOLS feature is implemented by installing the shell script
wrappers that add a sysroot and patch the specs. Idea is not to disturb
in any way the Makefile.inc1 or objformat logic at this moment. Since
all the main toolchain tools are installed as shell scripts this has a
nice bonus for quick hooks/probes and other hacky/pretty stuff without
disturbing the rest of the buildworld. You can even add your favorite
static analyser tool, just don't forget to change default include path
to /usr/obj/../world_x86_64/usr/include for it.

The objformat changes for sysroot would only make sense when we make a
port for another architecture. None of the new features are considered
to be guessTM enabled automatically at this moment. To be sure that
nothing has changed since previous buildworld from other changes in the
source tree one would have to compile and hex-diff the final products.
Keep in mind that libraries coming with the compilers will be rebuilt
even with both knobs passed. This should help catching most of the
issues before installworld step and not on the next {build,quick}world.

Both knobs are not documented in make.conf(5) on purpose. It is highly
advised *not* adding any of these knobs into make.conf, sooner or later
you will forget it and *will* get yourself in world recovery situation:
a) world backup machinery (unless you had NO_BACKUP=true in make.conf);
b) perform manual bootstrap to fix up the breakage;
c) restore from H1/H2 snapshots (toolchain components are located in
/usr/libexec/* and /usr/lib/${CCVER}/ directories);
d) clean overwrite by mounting from other system (like usb img stick).

Features should work with quickworld too.
To put things in perspective here is a little chart of the cleaned
fresh 'make -jX buildworld' times impact on few setups:

netbook: hw.model: Intel(R) Core(TM) i3 CPU U380 @ 1.33GHz
compiler: gcc50 as cc(1) (4gb usb stick for /, ironlake cpu)
make -j3 buildworld [-DNO_CROSSTOOLS] [-DNO_TOOLCHAIN]

min:sec | STANDARD | NO_C | NO_T | NO_C/NO_T |
----------------------------------------------------------------
gcc50 | 73:56 | 59:57 | 54:11 | 39:38 |
gcc47 (host+world)| N/I | N/I | N/I | 37:51 |
----------------------------------------------------------------

laptop setup: hw.model: Intel(R) Core(TM) i7-4712MQ CPU @ 2.30GHz
compiler: gcc50 as cc(1) (default)
make -j9 buildworld [-DNO_CROSSTOOLS] [-DNO_TOOLCHAIN]

min:sec | STANDARD | NO_C | NO_T | NO_C/NO_T |
----------------------------------------------------------------
gcc50 | 17:06 | 13:57 | 12:58 | 09:42 |
gcc50 gcc47 (def) | 20:18 | 16:03 | 14:58 | 10:37 |
gcc50 gcc80 | 24:24 | 18:06 | 17:31 | 11:23 |
gcc50 gcc47 gcc80 | 27:47 | 20:17 | 19:23 | 12:00 |
----------------------------------------------------------------

blade setup: dual hw.model: Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
compiler: gcc80 as cc(1) (soon gcc80 will replace gcc50 in master)
make -j32 buildworld [-DNO_CROSSTOOLS] [-DNO_TOOLCHAIN]

min:sec | STANDARD | NO_C | NO_T | NO_C/NO_T |
----------------------------------------------------------------
gcc80 | 06:58 | 05:19 | 05:33 | 03:51 |
gcc80 gcc47 (def*)| 08:03 | 06:06 | 06:02 | 04:05 |
gcc80 gcc50 | 08:23 | 06:12 | 06:19 | 04:08 |
gcc80 gcc47 gcc50 | 09:24 | 06:59 | 06:51 | 04:21 |
----------------------------------------------------------------

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gcc80: Shorten build time in libraries target.

When compiling compiler libraries build the minimal set of tools
required to generated the needed headers. Rest of the tools including
libcpp.na will b

gcc80: Shorten build time in libraries target.

When compiling compiler libraries build the minimal set of tools
required to generated the needed headers. Rest of the tools including
libcpp.na will be built during more parallel gnu/usr.bin stage.
Shaves off ~30s from make buildworld.

While there, do the same for gcc47 and gcc50. Also clean stale file.

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i386 removal, part 68/x: Remove a number of obsolete Makefiles from gnu/.

Reported-by: zrj

kgdb(1): Add missing "

Reported-by: zrj

gcc50: Plug in WARNS framework for tools.

At this point should be no-op change.

While there, do the same for gcc50 and gcc47.

gcc80: Create headers before depend in libbacktrace.

Avoids the situation where (if make depend fails for some reason)
build stops in a strange state.

While there, do the same for gcc50.

gcc80: Add missing atomic variants in libgcov.

Use correct config (currently unused).

gcc80: Partially implement TOOLCHAIN_CHECKING.

Will be needed for special feature testing in newer binutils.

collect2(1): Trim sources that create empty objects.

as(1): Trim sources that create empty objects.

LTO: Few workarounds for gcc80 -flto.

gcc80: Mark few sources as special for narrowing.

While there, add -Wpragmas suppression for gcc47.

gcc80: Activate workaround for libgcc_pic.a.

Port 082b455eab27fdd982397abd20137b57c063d594 from gcc50.

gcc80: Hook into the buildworld as optional compiler.

This alternative compiler can be activated by WORLD_ALTCOMPILER variable.
It will not be built by default.

gcc80: Add pregenerated manpages.

gcc80: Add pregenerated headers.