rustc: Don't deduplicate libraries linked to

Linker argument order with respect to libraries is important enough that we
shouldn't be attempting to filter out libraries getting passed through to the
linker. When linking with a native library that has multiple dependant native
libraries, it's useful to have control over the link argument order.
rustdoc: syntax highlight macro definitions, colour $... substitutions.

Macro definitions are just their raw source code, and so should be
highlighted where possible. Also, $ident non-terminal substitutions are
special, and so are worth of a little special treatment.
rustc: Better error when loading invalid libraries

When the metadata format changes, old libraries often cause librustc to abort
when reading their metadata. This should all change with the introduction of SVH
markers, but the loader for crates should gracefully handle libraries without
SVH markers still.

This commit adds support for tripping fewer assertions when loading libraries by
using maybe_get_doc when initially parsing metadata. It's still possible for
some libraries to fall through the cracks, but this should deal with a fairly
large number of them up front.
auto merge of #12645 : alexcrichton/rust/invalid-libraries, r=brson

When the metadata format changes, old libraries often cause librustc to abort
when reading their metadata. This should all change with the introduction of SVH
markers, but the loader for crates should gracefully handle libraries without
SVH markers still.

This commit adds support for tripping fewer assertions when loading libraries by
using maybe_get_doc when initially parsing metadata. It's still possible for
some libraries to fall through the cracks, but this should deal with a fairly
large number of them up front.
auto merge of #12647 : huonw/rust/rustdoc-highlight-macros, r=alexcrichton

Macro definitions are just their raw source code, and so should be
highlighted where possible. Also, $ident non-terminal substitutions are
special, and so are worthy of a little special treatment.
librustc: add LLVM LDFLAGS to deps

This commit let librustc automatically pickup LDFLAGS dependencies
inherited from LLVM, which may otherwise result in undefined
references to external symbols under certain linking environment.

A symptom of this issue is eg. a failure when trying to link against
librustc (due to unresolved ffi_*i symbols), while using a system-wide
LLVM.

Signed-off-by: Luca Bruno <lucab@debian.org>
auto merge of #12637 : pcwalton/rust/devecing, r=alexcrichton

r? @alexcrichton
travis: remove manually added RUSTFLAGS

Indirect dependencies should now be picked up through the
autogenerated llvmdeps.rs instead.

Signed-off-by: Luca Bruno <lucab@debian.org>
auto merge of #12651 : lucab/rust/llvmdep-ldflags, r=alexcrichton

This commit let librustc automatically pickup LDFLAGS dependencies
inherited from LLVM, which may otherwise result in undefined
references to external symbols under certain linking environment.

A symptom of this issue is eg. a failure when trying to link against
librustc (due to unresolved ffi_* symbols), while using a system-wide
LLVM.

Signed-off-by: Luca Bruno <lucab@debian.org>
Add /etc/terminfo to the terminfo search paths
auto merge of #12656 : Armavica/rust/terminfo, r=sfackler

According to `/etc/terminfo/README`,
```
This directory is for system-local terminfo descriptions. By default,
ncurses will search ${HOME}/.terminfo first, then /etc/terminfo (this
directory), then /lib/terminfo, and last not least /usr/share/terminfo.
```
Expand string literals and exprs inside of macros

A couple of syntax extensions manually expanded expressions, but it
wasn't done universally, most noticably inside of asm!().

There's also a bit of random cleanup.
test: Ignore some phase(syntax) tests

These tests are failing on the snap builders, and are now tagged with a FIXME.

cc #12102
auto merge of #12658 : sfackler/rust/asm-expand, r=alexcrichton

A couple of syntax extensions manually expanded expressions, but it
wasn't done universally, most noticably inside of asm!().

There's also a bit of random cleanup.
Make visible types public in rustc
auto merge of #12659 : alexcrichton/rust/fix-snap, r=sfackler

These tests are failing on the snap builders, and are now tagged with a FIXME.

cc #12102
auto merge of #12662 : sfackler/rust/unexported-type, r=cmr
Emacs: Remove README warning of old whitespace bug

The incompatibility of rust-mode with global-whitespace-mode warned
about in the README was actually fixed by commit 581b3db3b3.  Remove the
warning from the README and close #3994.
auto merge of #12663 : MicahChalmer/rust/emacs-remove-ws-bug-warning, r=brson

The incompatibility of rust-mode with global-whitespace-mode warned
about in the README was actually fixed by commit 581b3db3b3.  Remove the
warning from the README and close #3994.
test: Ignore some more syntax extension tests

This should get us a passing snapshot again.