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OpenBSD 5.9 apparently defaults to -fpie. We use -fno-PIE when appropriate
already, but that is not enough - it does not turn off -fpie.

Actually check for -fPIE is not precise enough. __PIE__ is set for both
-fpie and -fPIE but with different values. As far as I can tell, both
options were introduced at the same time, so both should always be supported.

This fixes compilation on OpenBSD 5.9 which otherwise created insanely big
lzma_decompress.img.

Reported, suggested and tested by: Jiri B <jirib@devio.us>

efiemu is supposed to be disabled when compiling through exe format.
Unfortunately format was determined only after efiemu check. Reorder to fix the
problem

Unwind tables are useless for us bt consume space if present. Ensure that they
are not.

Check tries -fno-dwarf2-cfi-asm but adds -fno-asynchronous-unwind-tables
to TARGET_CFLAGS. Fix this.

This argument disables generation of calls to __chkstk_ms. Those calls are
useless on GRUB as function is dummy. Yet they increase module size and
use limited-range relocations which may not work under some memory layouts.
We currently don't use such layouts on concerned platforms but lt's correct
this.

Macports add extra information after version itself:

$flex --version
flex 2.5.35 Apple(flex-31)

We require at least felx 2.5.35 so do not need to care about prehistoric
"flex version n.n.n"; just use second field always.

Reported by Peter Cheung <mcheung63@hotmail.com>

GRUB code expects O32 or N32. N32 is less tested than O32, so we prefer to
compile with O32. Some systems (e.g. GNU Guix) default to using newer
n64 or n32 ABI. Try to find suitable options to force o32.

For GCC this is simply -mabi=32. While clang supports this option as well,
o32 ABI is valid for MIPS target and n32/64 ABI are valid for MIPS64 target
only, so use "-target mips/mipsel -mabi=32".
Reported-By: Mark H Weaver <mhw@netris.org>
Also-By: Mark H Weaver <mhw@netris.org>

Fixes compilation with clang.

Also-by: Paulo Flabiano Smorigo <pfsmorigo@linux.vnet.ibm.com>

Fix compilation with gcc 5.1 (avoid internal compiler error), by
replacing explicit -march +nofp+nosimd options with -mgeneral-regs-only.

This also enables the removal of some further conditional build flag
setting.

It's disabled by default and has been broken for a long time.
As nobody is interested in fixing and maintaining it, remove it.

libgcc for boot environment isn't always present and compatible.
libgcc is often absent if endianness or bit-size at boot is different
from running OS.
libgcc may use optimised opcodes that aren't available on boot time.
So instead of relying on libgcc shipped with the compiler, supply
the functions in GRUB directly.
Tests are present to ensure that those replacement functions behave the
way compiler expects them to.

Fixes compilation for sparc64 with clang.

Add -msoft-float alongside clang arguments to specify ABI.
Specify ABI in asm files explicitly.
This trigers asm warning due to gcc failing to propagate -msoft-float
but it's tolerable.

clang already uses -mthumb-interwork behaviour even thout it doesn't
support the option.

Don't supply +nosimd to asm files.
Otherwise +nosimd coming from flags forbids some of instructions
used in cache_flush.

Automatically discover command line options to make clang and
gcc behave in same way.

Tested with qemu.

Deals with clang needing other arguments to stop issuing floating
instructions than gcc.

These platforms don't have a hard limit on size of resulting code16
code, so we don't care if assembly is bigger than necessarry.

Previously we relied on assumption that clang always needs -no-integrated-as
but it's not always true.

Otherwise mismatch between API flags triggers linker failure

aarch64 toolchains do not support the -msoft-float option added by
commit 3661261f

. Insted, for arm64 use -march=armv8-a+nofp+nosimd.
Reported-by: Ryan Harkin <ryan.harkin@linaro.org>

* configure.ac: Only remove include/grub/cpu and
include/grub/machine in the --platform=none case, not all of
include/grub.

This makes it possible to build generally-useful utilities such as
grub-mount even if the rest of GRUB has not been ported to the target
CPU.

* configure.ac: Add "none" platform.  Default to it for unsupported
CPUs rather than stopping with a fatal error.  Don't downgrade
x86_64-none to i386.  Define COND_real_platform Automake conditional
if the platform is anything other than "none".  Don't do any include
directory linking for "none".
* Makefile.am: Skip building grub-core and all bootcheck targets if
!COND_real_platform.
* include/grub/time.h: Don't include <grub/cpu/time.h> if GRUB_UTIL
is defined.

* configure.ac: Remove -m64 from checks for -mcmodel=large and
-mno-red-zone.  These are always either unnecessary (x86_64-emu) or
already in TARGET_CFLAGS at this point, and they produce incorrect
results when building for x32.
* grub-core/kern/x86_64/dl.c (grub_arch_dl_relocate_symbols): Cast
pointers to Elf64_Xword via grub_addr_t, in order to work on x32.
* include/grub/x86_64/types.h (GRUB_TARGET_SIZEOF_VOID_P,
GRUB_TARGET_SIZEOF_LONG): Define to 4 on x32.

It is installed in this path on openSUSE.