adapt to ${CC_WNO_MAYBE_UNINITIALIZED}

Use ${CC_WNO_MAYBE_UNINITIALIZED} instead of
the older style more complex expressions.

Remove workarounds if they were for a specific
version of gcc < 10.

gcc: fix build with clang++ HOST_CXX

Define HOSTPROG_CXX before .include anything that brings in bsd.own.mk.
This ensures that HOST_DBG (etc) gets assigned before HOST_CFLAGS
and HOST_CXXFLAGS is cr

gcc: fix build with clang++ HOST_CXX

Define HOSTPROG_CXX before .include anything that brings in bsd.own.mk.
This ensures that HOST_DBG (etc) gets assigned before HOST_CFLAGS
and HOST_CXXFLAGS is created.

backend: .include <bsd.init.mk> much earlier, as per the other directories.
Fixes backend build when using clang++ as the host compiler (e.g., macOS),
because backend host tools are now built with -O.
Inspired by https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255760

Note that gcc.old/Makefile.prog may be mis-used because it defines HOSTPROG_CXX
and this Makefile fragment is included after bsd.*.mk in other Makefiles,
but they seem to build ok so leaving it alone for now.

Fixes PR toolchain/57014

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Patch the build script and toolchain to allow passing through
HOST_CPPFLAGS, HOST_CXXFLAGS, but not LIBRARY_PATH because it breaks
the build. These variables are necessary to support building NetBSD

Patch the build script and toolchain to allow passing through
HOST_CPPFLAGS, HOST_CXXFLAGS, but not LIBRARY_PATH because it breaks
the build. These variables are necessary to support building NetBSD
from a GNU Guix or NixOS host, where /usr/include, /lib, and all
but /bin/sh do not exist. In many cases, support for HOST_CPPFLAGS
was incomplete. From Ryan Sundberg

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more -O0 for vax

various changes to get GCC 10 to build here.

- fix path to compiler-specific includes
- missing (void) for (older) C
- fix __is_signed/__is_signed_val change
- avoid compiler warning-as-errors
- add

various changes to get GCC 10 to build here.

- fix path to compiler-specific includes
- missing (void) for (older) C
- fix __is_signed/__is_signed_val change
- avoid compiler warning-as-errors
- add to existing COPTS.file values, instead of setting
- bump libgomp minor; functions were added
- add new 'compare' c++ header
- handle new analyzer subdirectory. set TARGET_MACHINE for lto-streamer-in.c.
remove params.list etc handling.
- coroutines.cc is another .cc not .c. adjust .PATH to suit.
- add new lto1 sources
- couple of files not in /arch/ subdirs missed in mknative update.

rs6000.c is still not merged.

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make build and work on sh3 and vax.

build-hash-table.lo and build-vec.lo depend upon $HASH_TABLE_H not $GGC_H

make GCC 9.3.0 build itself:
- common-target is needed before common now
- complete build-sort.o framework
- fix cyclic dep
- fix .c vs .cc issues

port reachover framework to GCC 9.

Treat aarch64eb the same as aarch64, enabling aarch64eb build

external/gpl3/gcc: Suppress -Werror=maybe-uninitialized

Seems like false positive since the ASM_GENERATE_INTERNAL_LABEL macro
stores the value into prev_label, so it is alright for prev_label to
be

external/gpl3/gcc: Suppress -Werror=maybe-uninitialized

Seems like false positive since the ASM_GENERATE_INTERNAL_LABEL macro
stores the value into prev_label, so it is alright for prev_label to
be uninitialized.

Error was reported when build.sh was run with MKSANITIZER=yes flag.

Reviewed by: kamil@

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Add more -O0 files for vax, sort

make most of this compile:
- sanitizer_procmaps_netbsd.cc is obsolete.
- fix merge botches where upstrem has as slightly different version
is upstream than prior local
- libstdc++ default is now gn

make most of this compile:
- sanitizer_procmaps_netbsd.cc is obsolete.
- fix merge botches where upstrem has as slightly different version
is upstream than prior local
- libstdc++ default is now gnu++17
- ubsan needs UBSAN_CAN_USE_CXXABI set
- properly use $G_RTL_BASE_H not (empty) $RTL_BASE_H
- libbackend HH gains new generated insn-modes-inline.h, and read-md.c
gains the HH dep.

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Fake mknative for riscv64, enough to complete a tools build.

clean all the temporary and other files in a build.

apply -O0 to a few more files for vax.

ira-color.c needs -Wno-error=int-in-bool-context for now.

- make the build depend upon the BASE-VER file.
- workaround a problem only see with -O2 in ipa-inline.c: it can't
convince itself that an integer underflow can't happen.

Aarch64 specific generated files.

add missing cgraphunit.c dependancy on pass_manager.h. should fix report
from thorpej on current-users about missing pass-instances.def.

fix some more missing depends issues. remove various wrong/old depends.

fixes issues i was able to trigger manually by building specific files.

more for PR#53137.

fix the hard coded depends list for insn-*. i pulled these out
of the generated .d files for a successful build. i've tested
that at least one recent macppc build failure is fixed with this
change

fix the hard coded depends list for insn-*. i pulled these out
of the generated .d files for a successful build. i've tested
that at least one recent macppc build failure is fixed with this
change (namely, try building just insn-emit.o in this subdir),
but the pattern should fix anything else left in insn*.

this really should finally fix PR#53137.

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pretty much everything depends upon insn-opinit.h via optabs-query.h
so set it in DPSRCS. hopefully this fixes PR 53137.

apply some more vax -O0/-O1. this now builds.

handle programs that have 3 outputs in a saner fashion.
hopefully fixes PR 53137.