Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

* pc-bios/optionrom/Makefile fixes
* warning fixes for __atomic_load and -1 << x in clang
* missed interrupt fix from Go

Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

* pc-bios/optionrom/Makefile fixes
* warning fixes for __atomic_load and -1 << x in clang
* missed interrupt fix from Gonglei
* checkpatch fix from Radim and myself

# gpg: Signature made Wed 10 Aug 2016 14:54:31 BST
# gpg: using RSA key 0xBFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>"
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1
# Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream:
checkpatch: default to success if only warnings
checkpatch: bump most warnings to errors
CODING_STYLE, checkpatch: update line length rules
checkpatch: check for CVS keywords on all sources
checkpatch: tweak the files in which TABs are checked
timer: set vm_clock disabled default
checkpatch: ignore automatically imported Linux headers
clang: Fix warning reg. expansion to 'defined'
Disable warn about left shifts of negative values
atomic: strip "const" from variables declared with typeof
optionrom: fix compilation with mingw docker target
optionrom: add -fno-stack-protector
build-sys: fix building with make CFLAGS=.. argument
linuxboot_dma: avoid guest ABI breakage on gcc vs. clang compilation

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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optionrom: fix compilation with mingw docker target

Two fixes are needed. First, mingw does not have -D_FORTIFY_SOURCE,
hence --enable-debug disables optimization. This is not acceptable
for ROMs,

optionrom: fix compilation with mingw docker target

Two fixes are needed. First, mingw does not have -D_FORTIFY_SOURCE,
hence --enable-debug disables optimization. This is not acceptable
for ROMs, which should override CFLAGS to force inclusion of -O2.

Second, PE stores global constructors and destructors using the
following linker script snippet:

___CTOR_LIST__ = .; __CTOR_LIST__ = . ;
LONG (-1);*(.ctors); *(.ctor); *(SORT(.ctors.*)); LONG (0);
___DTOR_LIST__ = .; __DTOR_LIST__ = . ;
LONG (-1); *(.dtors); *(.dtor); *(SORT(.dtors.*)); LONG (0);

The LONG directives cause the .img files to be 16 bytes too large;
the recently added check to signrom.py catches this. To fix this,
replace -T and -e options with a linker script.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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