Use Darwin libtool's -no_warning_for_no_symbols if available to silence the "has no symbols" link warning

Building compiler-rt on Darwin produces dozens of meaningless warnings about object files having no symbols during static archive creation. This is very intentional as compiler-rt uses #ifdefs to conditionally compile platform-specific code, and we even have a .cpp source file that only contains static asserts to make sure the environment is configured right. On Linux, this situation is fine and no warning is produced. This patch adds a libtool version detection and if it's new enough, we'll use the -no_warning_for_no_symbols flag that suppresses this warning. Build logs should be much cleaner now!

Differential Revision: https://reviews.llvm.org/D27119

llvm-svn: 288640

Introduce new constructor for STRCONCAT binop with a shortcut that
immediately concatenates if the two arguments are StringInits.
Makes the QualifyName code more readable and tablegen 2-3% faster.

llvm-svn: 288639

llvm-svn: 288638

[Hexagon] Adding additional tokenization characters in preparation for removing spacing from syntax.

llvm-svn: 288637

[AVX-512] Teach fast isel to use masked compare and movss for handling scalar cmp and select sequence when AVX-512 is enabled. This matches the behavior of normal isel.

llvm-svn: 288636

Currently the fast isel code emits an avx1 instruction sequence even with avx512. This is different than normal isel. A follow up commit will fix this.

llvm-svn: 288635

[Hexagon] Changing from literal numeric value to argument since #-1 will not parse when '-' is converted to a token.

llvm-svn: 288634

This is updating to take r288632 into account.

llvm-svn: 288633

The old implementation of add_llvm_tool_symlink could fail in odd ways when building out of tree. This version solves that problem by not using the LLVM_* variables, and instead reaeding the target's properties.

llvm-svn: 288632

Remainders of tasks were ran in the main thread, so parallel_for_each
could theoretically take 2x time than the ideal.

llvm-svn: 288631

llvm-svn: 288630

llvm-svn: 288629

llvm-svn: 288628

llvm-svn: 288627

Revert "Recover better from an incompatible .pcm file being provided by -fmodule-file=. We try to include the headers of the module textually in this case, still enforcing the modules semantic rules. In order to make that work, we need to still track that we're entering and leaving the module. Also, if the module was also marked as unavailable (perhaps because it was missing a file), we shouldn't mark the module unavailable -- we don't need the module to be complete if we're going to enter it textually."

This reverts commit r288449.

I believe that this is currently faulty wrt. modules being imported
inside namespaces. Adding these lines to the new test:

  namespace n {
  #include "foo.h"
  }

Makes it break with

  fatal error: import of module 'M' appears within namespace 'n'

However, I believe it should fail with

  error: redundant #include of module 'M' appears within namespace 'n'

I have tracked this down to us now inserting a tok::annot_module_begin
instead of a tok::annot_module_include in
Preprocessor::HandleIncludeDirective() and then later in
Parser::parseMisplacedModuleImport(), we hit the code path for
tok::annot_module_begin, which doesn't set FromInclude of
checkModuleImportContext to true (thus leading to the "wrong"
diagnostic).

llvm-svn: 288626

llvm-svn: 288625

On macOS, we often symbolicate using atos (when llvm-symbolizer is not found). The current way we invoke atos involves creating a pseudo-terminal to make sure atos doesn't buffer its output. This however also makes atos think that it's stdin is interactive and in some error situations it will ask the user to enter some input instead of just printing out an error message. For example, when Developer Mode isn't enabled on a machine, atos cannot examine processes, and it will ask the user to enter an administrator's password, which will make the sanitized process get stuck. This patch only connects the pseudo-terminal to the stdout of atos, and uses a regular pipe as its stdin.

Differential Revision: https://reviews.llvm.org/D27239

llvm-svn: 288624

Previously these hashes were 0 and -1 respectively. These seem like common
sentinel values and should be avoided to prevent needless collisions.

This patch changes those values to different arbitrary numbers, which should
hopefully cause less collisions. Because I couldn't help myself I choose the
fundamental constants for gravity and the speed of light.

llvm-svn: 288623

llvm-svn: 288622

I think these intrinsics were added after the Commutative was added to most of the rest of the intrinsics and it must have been forgotten.

llvm-svn: 288621

I removed a wrong optimization for ICF in r288527. Sean Silva suggested
in a post commit review that the correct algorithm can be implemented
easily. So is this patch.

llvm-svn: 288620

llvm-svn: 288619

This seems to be fixed as of r288052.

llvm-svn: 288618

They might be used by relocations.

Fixes pr31252.

llvm-svn: 288617

It is not clear if it is worth the complexity to use \ on
windows. This should fix the bots.

llvm-svn: 288616

Patch by Mark Santaniello.

llvm-svn: 288615

llvm-svn: 288614

All these records are internalized and will live until exit.  This makes
them perfect candidates for a fast BumpPtrAllocator.

llvm-svn: 288613

This will allow to switch to a different string storage in an upcoming
commit.

llvm-svn: 288612

llvm-svn: 288611

This avoid an extra construction of a std::string (and a heap
allocation) when the caller only has a StringRef but no std::string at
hand.

llvm-svn: 288610

llvm-svn: 288609

Changes all static helper functions in MachOObjectFile.cpp that expect a
non-null MachOObjectFile pointer to take a reference instead.

llvm-svn: 288608

Change SectionSymbols so that it doesn't hard-code ELF types, so that
it can be used for non-ELF targets.

llvm-svn: 288607

llvm-svn: 288606

llvm-svn: 288605

Revert r288447 which introduced -mdirect. It turns out we don't need a
custom flag for this, as the information we need is in the target triple.

llvm-svn: 288604

getNode already prevents formation of out of bounds constant
extract_vector_elts. Do the same for insert_vector_elt.

llvm-svn: 288603

Use the target triple to determine whether to run the explicit-locals
pass, rather than using a separate command-line argument.

llvm-svn: 288602

	lib/Target/AMDGPU/SIRegisterInfo.cpp: In member function 'void llvm::SIRegisterInfo::spillSGPR(llvm::MachineBasicBlock::iterator, int, llvm::RegScavenger*) const':
	lib/Target/AMDGPU/SIRegisterInfo.cpp:572:30: warning: variable 'SubRC' set but not used [-Wunused-but-set-variable]
	   const TargetRegisterClass *SubRC = nullptr;
	                              ^
	lib/Target/AMDGPU/SIRegisterInfo.cpp: In member function 'void llvm::SIRegisterInfo::restoreSGPR(llvm::MachineBasicBlock::iterator, int, llvm::RegScavenger*) const':
	lib/Target/AMDGPU/SIRegisterInfo.cpp:723:30: warning: variable 'SubRC' set but not used [-Wunused-but-set-variable]
	   const TargetRegisterClass *SubRC = nullptr;
	                              ^

The variable was assigned to, but never used.  The functions called did not
mutate state.  Simplify the logic and remove the variable.  Identified by gcc
5.4.0.

llvm-svn: 288601