Check the `-mlong-calls` command line option and pass the `long-calls`
feature flag to the backend. Handling of this feature flag in the backend
needs to be implemented by a separate commit.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@307152 91177308-0d34-0410-b5e6-96231b3b80d8

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The test in r304929 broke multiple buildbots as it expected mips target to
be registered and available (which is not necessarily true). Updating the
test with this condition.

Original commit:

  [mips] Add runtime options to enable/disable madd.fmt and msub.fmt

  Add options to clang: -mmadd4 and -mno-madd4, use it to enable or disable
  generation of madd.fmt and similar instructions respectively, as per GCC.

  Patch by Stefan Maksimovic.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@304953 91177308-0d34-0410-b5e6-96231b3b80d8

Revert r304929 since the test broke buildbots.

Original commit:

  [mips] Add runtime options to enable/disable madd.fmt and msub.fmt

  Add options to clang: -mmadd4 and -mno-madd4, use it to enable or disable
  generation of madd.fmt and similar instructions respectively, as per GCC.

  Patch by Stefan Maksimovic.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@304935 91177308-0d34-0410-b5e6-96231b3b80d8

Add options to clang: -mmadd4 and -mno-madd4, use it to enable or disable
generation of madd.fmt and similar instructions respectively, as per GCC.

Patch by Stefan Maksimovic.

Differential Revision: https://reviews.llvm.org/D33401


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@304929 91177308-0d34-0410-b5e6-96231b3b80d8

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Summary:
(This is a move-only refactoring patch. There are no functionality changes.)

This patch splits apart the Clang driver's tool and toolchain implementation
files. Each target platform toolchain is moved to its own file, along with the
closest-related tools. Each target platform toolchain has separate headers and
implementation files, so the hierarchy of classes is unchanged.

There are some remaining shared free functions, mostly from Tools.cpp. Several
of these move to their own architecture-specific files, similar to r296056. Some
of them are only used by a single target platform; since the tools and
toolchains are now together, some helpers now live in a platform-specific file.
The balance are helpers related to manipulating argument lists, so they are now
in a new file pair, CommonArgs.h and .cpp.

I've tried to cluster the code logically, which is fairly straightforward for
most of the target platforms and shared architectures. I think I've made
reasonable choices for these, as well as the various shared helpers; but of
course, I'm happy to hear feedback in the review.

There are some particular things I don't like about this patch, but haven't been
able to find a better overall solution. The first is the proliferation of files:
there are several files that are tiny because the toolchain is not very
different from its base (usually the Gnu tools/toolchain). I think this is
mostly a reflection of the true complexity, though, so it may not be "fixable"
in any reasonable sense. The second thing I don't like are the includes like
"../Something.h". I've avoided this largely by clustering into the current file
structure. However, a few of these includes remain, and in those cases it
doesn't make sense to me to sink an existing file any deeper.

Reviewers: rsmith, mehdi_amini, compnerd, rnk, javed.absar

Subscribers: emaste, jfb, danalbert, srhines, dschuff, jyknight, nemanjai, nhaehnle, mgorny, cfe-commits

Differential Revision: https://reviews.llvm.org/D30372

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This patch moves helper functions that are CPU-specific out of Driver.cpp and to
separate implementation files. The new files are named for the architecture,
e.g. ARMArch.cpp.

The next step after this will be to move OS-specific code, which I expect will
include many of the tool implementations, to similarly separate files.

Some CPU-specific functions are not being moved just yet. In cases where the
only caller is the platform-specific tools, I plan to move them together. An
example is Hexagon, where the only caller of the architecture-specific functions
are the tools themselves. (I'm happy to revise this choice, it just seems like
less churn to me.)

This does mean that some functions which were previously static are now exposed
through the library header Driver.h.

Reviewers: rsmith, javed.absar

Subscribers: aemerson, danalbert, srhines, dschuff, jyknight, nemanjai, mgorny, cfe-commits

Differential Revision: https://reviews.llvm.org/D30315

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