configure: Fix copying clang_headers for non-x86 architectures.

Also allow Clang for PowerPC builds.

configure: Allow Clang for ARM builds.

configure: Do --update check earlier.

Previously we initialized variables and ran a few $CC tests first
(which was what the old version of --update needed.) Now, we can do it
almost immediately afte

configure: Do --update check earlier.

Previously we initialized variables and ran a few $CC tests first
(which was what the old version of --update needed.) Now, we can do it
almost immediately after the script begins.

Spotted by running --update on a GCCless system (as the $CC tests
gave warning messages due to no GCC, while CC= was set in --update
environs.)

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configure: Detect lld and elfedit properly under Clang.

Enable use of Clang's integrated assembler.

configure: Fix "unsupported target architecture" message.

configure: Add missing word-boundary marker to test invocation.

Fixes specifying a secondary cross-arch that is a substring of the first
(e.g. "x86_gcc2"+"x86".) Thanks to nielx for noticing!

configure: Cleaner grouping of compiler settings.

Now, instead of breaking them up, all settings related to or gleaned
from the compiler are listed first (except for BOOT_CXXFLAGS_...).
No functiona

configure: Cleaner grouping of compiler settings.

Now, instead of breaking them up, all settings related to or gleaned
from the compiler are listed first (except for BOOT_CXXFLAGS_...).
No functional change intended.

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configure: Move deduplifying targetArchs to where HAIKU_PACKAGING_ARCHS is built.

If one specifies a cross-tools path instead of --build-cross-tools along
with --use-clang, then the specified archit

configure: Move deduplifying targetArchs to where HAIKU_PACKAGING_ARCHS is built.

If one specifies a cross-tools path instead of --build-cross-tools along
with --use-clang, then the specified architecture winds up in the list twice,
as the first test looks for the arch name where only "unknown" exists
(since in the case of cross-tools paths, we delay fetching the arch.)
So we need to move this check to there instead.

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configure: If set, pass the cross-tools-prefix when invoking Clang.

This lets clang use our linker and other binutils instead of its own.
Now clang builds produce a working bootloader and get all th

configure: If set, pass the cross-tools-prefix when invoking Clang.

This lets clang use our linker and other binutils instead of its own.
Now clang builds produce a working bootloader and get all the way
to the "rocket" icon, at which point userland init fails.

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Remove HAIKU_INCLUDE_PATENTED_CODE.

Nothing uses it anymore. Fixes #8935.

configure: Rebuild cross-tools if GCC configure is newer than built GCC.

configure: Make sure the output directory exists before running xattr tests.

configure: Improve toolchain validation

* Seeing an issue on our builders where the toolchain directory
exists, but the gcc binaries do not.
* Check for the path, as well as the actual compiler bi

configure: Improve toolchain validation

* Seeing an issue on our builders where the toolchain directory
exists, but the gcc binaries do not.
* Check for the path, as well as the actual compiler binaries
to improve detection of need to rebuild toolchain.

Change-Id: I54fd5789e3255c8295136bb0614e72c5393718fe

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Removal of non-Haiku target platform logic from build system (part 1.)

Following recent changes to use libroot_build on Haiku also, it is now
actually impossible to build Haiku components on non-Hai

Removal of non-Haiku target platform logic from build system (part 1.)

Following recent changes to use libroot_build on Haiku also, it is now
actually impossible to build Haiku components on non-Haiku platforms
(BeOS R5, Dan0, BONE, Zeta), so we can remove any logic related to this.

This is only the first part; still to be removed are:
* SetSubDirSupportedPlatformsBeOSCompatible
* HOST_PLATFORM_BEOS_COMPATIBLE
* TARGET_PLATFORM_BEOS_COMPATIBLE

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build: Correct libroot_build's usage of xattrs on a Haiku host.

Implemented by just not defining the functions at all and letting
the Haiku ones shine through. In the future, though, we should wrap

build: Correct libroot_build's usage of xattrs on a Haiku host.

Implemented by just not defining the functions at all and letting
the Haiku ones shine through. In the future, though, we should wrap
them properly.

(Between the switch to libroot_build and this commit, libroot_build
was using the generic attribute emulation layer on Haiku ... whoops.)

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configure: Properly test for set crossToolsPrefix and targetArchs.

Now you can specify a --build-cross-tools and then override just
GCC from it with a following --use-clang in the same configure
inv

configure: Properly test for set crossToolsPrefix and targetArchs.

Now you can specify a --build-cross-tools and then override just
GCC from it with a following --use-clang in the same configure
invocation.

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configure: Enable use-xattr or use-xattr-ref automatically.

The previous commit only checked that they worked if the user
enabled them, but now they will be enabled automatically if the
underlying f

configure: Enable use-xattr or use-xattr-ref automatically.

The previous commit only checked that they worked if the user
enabled them, but now they will be enabled automatically if the
underlying filesystem supports them.

The ReadMe.Compiling has been updated accordingly.

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configure: Actually check the host's support for extended attributes.

Previously the helptext just displayed a warning to "make sure your
file system supports sufficient attribute sizes", and left t

configure: Actually check the host's support for extended attributes.

Previously the helptext just displayed a warning to "make sure your
file system supports sufficient attribute sizes", and left the
actual checks to libroot_build at runtime.

Now we use the native command-line tools of each platform to make sure
that we can actually set attributes large enough for --use-xattr and
--use-xattr-ref respectively.

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configure: Rewrite implementation of --update.

Previously --update was kind of a hack, as it just dumped all
the variables from BuildConfig back into ./configure and attempted
to rerun from there.

configure: Rewrite implementation of --update.

Previously --update was kind of a hack, as it just dumped all
the variables from BuildConfig back into ./configure and attempted
to rerun from there.

Instead, now we store all of the variables and environs configure
was invoked with in the top of BuildConfig and re-call it using them.
This is much more robust, as configure will actually recompute
all of the values from the BuildConfig.

As a side effect, if configure was originally invoked to build crosstools,
it would have done so again, so instead add a check to see if they
exist, and skip them if they do. It's easy enough to delete the
directory if you want to force a crosstools rebuild.

Briefly discussed with mmlr on IRC.

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configure: Remove totally useless --enable-multiuser switch.

It's not used anywhere in the build system at all.

build: Copy and use Clang's vector intrinsics headers.

When compiling with GCC, these headers get pulled in from the
gcc_syslibs_devel package, but we cannot do something similar
for Clang as Clang

build: Copy and use Clang's vector intrinsics headers.

When compiling with GCC, these headers get pulled in from the
gcc_syslibs_devel package, but we cannot do something similar
for Clang as Clang adds/removes internal builtins used by
the headers nearly every version. So instead we just copy
all the intrinsics headers from current Clang into generated,
and make sure this directory is included before any others.

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configure: Further fixes to Clang support.

* Actually locate the clang executable, and allow user overrides
* Properly preserve arguments in get_build_tool_path
* Fix get_build_tool_path for comm

configure: Further fixes to Clang support.

* Actually locate the clang executable, and allow user overrides
* Properly preserve arguments in get_build_tool_path
* Fix get_build_tool_path for commands with dashes (e.g. "clang-5.0")

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configure: Avoid bashism introduced in previous hrev.

configure: Fix & enhance --use-clang.

Now you set the arch along with the argument, and specify the binutils
manually (and thus build without a complete crosstools environment.)