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* Revert "SCEVExpander: Try hard not to create derived induction variables in ↵Arnold Schwaighofer2014-02-15
| | | | | | | | other loops" This reverts commit r201465. It broke an arm bot. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201466 91177308-0d34-0410-b5e6-96231b3b80d8
* SCEVExpander: Try hard not to create derived induction variables in other loopsArnold Schwaighofer2014-02-15
| | | | | | | | | | | | | | | | | During LSR of one loop we can run into a situation where we have to expand the start of a recurrence of a loop induction variable in this loop. This start value is a value derived of the induction variable of a preceeding loop. SCEV has cannonicalized this value to a different recurrence than the recurrence of the preceeding loop's induction variable (the type and/or step direction) has changed). When we come to instantiate this SCEV we created a second induction variable in this preceeding loop. This patch tries to base such derived induction variables of the preceeding loop's induction variable. This helps twolf on arm and seems to help scimark2 on x86. radar://15970709 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201465 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove unnecessary typename introduced in r201440.David Blaikie2014-02-15
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201450 91177308-0d34-0410-b5e6-96231b3b80d8
* Hopefully fix the build with gcc.Rafael Espindola2014-02-14
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201443 91177308-0d34-0410-b5e6-96231b3b80d8
* Add extern template instantiations of llvm::Calculate.Rafael Espindola2014-02-14
| | | | | | | | | | | This should be a small build time improvement in general and fixes the build on OS X with -DBUILD_SHARED_LIBS=ON. The issue is that not all users are including GenericDomTreeConstruction.h, causing undefined references when ld64 managed to hide the linkonce_odr symbols. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201440 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove unused #includeEli Bendersky2014-02-14
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201430 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't build DFSan functionality for Android.Stephen Hines2014-02-13
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201362 91177308-0d34-0410-b5e6-96231b3b80d8
* Check that GlobalAliases don't have section or alignment.Rafael Espindola2014-02-13
| | | | | | | An alias is always in the section of its aliasee and has the same alignment (since it has the same address). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201354 91177308-0d34-0410-b5e6-96231b3b80d8
* SCCIterator: Merge MinVisitNumStack and VisitStackDuncan P. N. Exon Smith2014-02-13
| | | | | | | | | This patch merges MinVisitNumStack with VisitStack using a StackElement struct. Patch by Mehdi Amini! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201353 91177308-0d34-0410-b5e6-96231b3b80d8
* Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove ↵Daniel Sanders2014-02-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | hasRawTextSupport() call Summary: AsmPrinter::EmitInlineAsm() will no longer use the EmitRawText() call for targets with mature MC support. Such targets will always parse the inline assembly (even when emitting assembly). Targets without mature MC support continue to use EmitRawText() for assembly output. The hasRawTextSupport() check in AsmPrinter::EmitInlineAsm() has been replaced with MCAsmInfo::UseIntegratedAs which when true, causes the integrated assembler to parse inline assembly (even when emitting assembly output). UseIntegratedAs is set to true for targets that consider any failure to parse valid assembly to be a bug. Target specific subclasses generally enable the integrated assembler in their constructor. The default value can be overridden with -no-integrated-as. All tests that rely on inline assembly supporting invalid assembly (for example, those that use mnemonics such as 'foo' or 'hello world') have been updated to disable the integrated assembler. Changes since review (and last commit attempt): - Fixed test failures that were missed due to configuration of local build. (fixes crash.ll and a couple others). - Fixed tests that happened to pass because the local build was on X86 (should fix 2007-12-17-InvokeAsm.ll) - mature-mc-support.ll's should no longer require all targets to be compiled. (should fix ARM and PPC buildbots) - Object output (-filetype=obj and similar) now forces the integrated assembler to be enabled regardless of default setting or -no-integrated-as. (should fix SystemZ buildbots) Reviewers: rafael Reviewed By: rafael CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D2686 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201333 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove dead code.Rafael Espindola2014-02-13
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201327 91177308-0d34-0410-b5e6-96231b3b80d8
* [Vectorizer] Add a new 'OperandValueKind' in TargetTransformInfo calledAndrea Di Biagio2014-02-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'OK_NonUniformConstValue' to identify operands which are constants but not constant splats. The cost model now allows returning 'OK_NonUniformConstValue' for non splat operands that are instances of ConstantVector or ConstantDataVector. With this change, targets are now able to compute different costs for instructions with non-uniform constant operands. For example, On X86 the cost of a vector shift may vary depending on whether the second operand is a uniform or non-uniform constant. This patch applies the following changes: - The cost model computation now takes into account non-uniform constants; - The cost of vector shift instructions has been improved in X86TargetTransformInfo analysis pass; - BBVectorize, SLPVectorizer and LoopVectorize now know how to distinguish between non-uniform and uniform constant operands. Added a new test to verify that the output of opt '-cost-model -analyze' is valid in the following configurations: SSE2, SSE4.1, AVX, AVX2. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201272 91177308-0d34-0410-b5e6-96231b3b80d8
* [Stackmaps] Fix the ID type to be i64 also for stackmaps (as we claim in the ↵Juergen Ributzka2014-02-12
| | | | | | | | | | | documenation) The ID type for the stackmap and patchpoint intrinsics are in both cases i64. This fixes an zero extend in the SelectionDAGBuilder that still used i32. This also updates the target independent instructions STACKMAP and PATCHPOINT to use the correct type. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201262 91177308-0d34-0410-b5e6-96231b3b80d8
* Extend RTDyld API to enable optionally precomputing the total amount of memoryLang Hames2014-02-12
| | | | | | | | | | | | | | | | | | | | required for all sections in a module. This can be useful when targets or code-models place strict requirements on how sections must be laid out in memory. If RTDyldMemoryManger::needsToReserveAllocationSpace() is overridden to return true then the JIT will call the following method on the memory manager, which can be used to preallocate the necessary memory. void RTDyldMemoryManager::reserveAllocationSpace(uintptr_t CodeSize, uintptr_t DataSizeRO, uintptr_t DataSizeRW) Patch by Vaidas Gasiunas. Thanks very much Viadas! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201259 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r201237+r201238: Demote EmitRawText call in ↵Daniel Sanders2014-02-12
| | | | | | | | | AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call It introduced multiple test failures in the buildbots. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201241 91177308-0d34-0410-b5e6-96231b3b80d8
* Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove ↵Daniel Sanders2014-02-12
| | | | | | | | | | | | | | | | | | | | | hasRawTextSupport() call Summary: AsmPrinter::EmitInlineAsm() will no longer use the EmitRawText() call for targets with mature MC support. Such targets will always parse the inline assembly (even when emitting assembly). Targets without mature MC support continue to use EmitRawText() for assembly output. The hasRawTextSupport() check in AsmPrinter::EmitInlineAsm() has been replaced with MCAsmInfo::UseIntegratedAs which when true, causes the integrated assembler to parse inline assembly (even when emitting assembly output). UseIntegratedAs is set to true for targets that consider any failure to parse valid assembly to be a bug. Target specific subclasses generally enable the integrated assembler in their constructor. The default value can be overridden with -no-integrated-as. All tests that rely on inline assembly supporting invalid assembly (for example, those that use mnemonics such as 'foo' or 'hello world') have been updated to disable the integrated assembler. Reviewers: rafael Reviewed By: rafael CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D2686 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201237 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove unneeded includeMatt Arsenault2014-02-12
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201201 91177308-0d34-0410-b5e6-96231b3b80d8
* ScalarEvolution: Analyze trip count of loops with a switch guarding the exit.Benjamin Kramer2014-02-11
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201159 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove TimeValue::toPosixTime() -- it is buggy, semantics are unclear, and itsDmitri Gribenko2014-02-11
| | | | | | | only current user should be using toEpochTime() instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201136 91177308-0d34-0410-b5e6-96231b3b80d8
* Changed attributes of all gather intrinsics from IntrReadMem to ↵Craig Topper2014-02-11
| | | | | | IntrReadArgMem as they access only memory based on argument. Patch by Robert Khasanov. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201126 91177308-0d34-0410-b5e6-96231b3b80d8
* [Stackmaps] Cleanup code. No functional change intended.Juergen Ributzka2014-02-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201115 91177308-0d34-0410-b5e6-96231b3b80d8
* LTO API: add lto_module_create_from_memory_with_path.Manman Ren2014-02-10
| | | | | | | | | | | | | | This function adds an extra path argument to lto_module_create_from_memory. The path argument will be passed to makeBuffer to make sure the MemoryBuffer has a name and the created module has a module identifier. This is mainly for emitting warning messages from the linker. When we emit warning message on a module, we can use the module identifier. rdar://15985737 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201114 91177308-0d34-0410-b5e6-96231b3b80d8
* Mark the methods in the Mangler const.Rafael Espindola2014-02-10
| | | | | | | | | A const ObjectFile needs to be able to provide its name. For an IRObjectFile, that means being able to call the mangler. Since each IRObjectFile can have a different mangling, it is natural for them to contain a Mangler which is therefore also const. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201113 91177308-0d34-0410-b5e6-96231b3b80d8
* Change the begin and end methods in ObjectFile to match the style guide.Rafael Espindola2014-02-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201108 91177308-0d34-0410-b5e6-96231b3b80d8
* ARM: use natural LLVM IR for vshll instructionsTim Northover2014-02-10
| | | | | | | | Similarly to the vshrn instructions, these are simple zext/sext + trunc operations. Using normal LLVM IR should allow for better code, and more sharing with the AArch64 backend. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201093 91177308-0d34-0410-b5e6-96231b3b80d8
* Make succ_iterator a real random access iterator and clean up a couple of users.Benjamin Kramer2014-02-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201088 91177308-0d34-0410-b5e6-96231b3b80d8
* ARM: use LLVM IR to represent the vshrn operationTim Northover2014-02-10
| | | | | | | | | | vshrn is just the combination of a right shift and a truncate (and the limits on the immediate value actually mean the signedness of the shift doesn't matter). Using that representation allows us to get rid of an ARM-specific intrinsic, share more code with AArch64 and hopefully get better code out of the mid-end optimisers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201085 91177308-0d34-0410-b5e6-96231b3b80d8
* [mips][msa] Add DLSA instruction.Matheus Almeida2014-02-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201081 91177308-0d34-0410-b5e6-96231b3b80d8
* MCParser: add a single token lookaheadSaleem Abdulrasool2014-02-09
| | | | | | | Some of the more complex directive and macro handling for GAS compatibility requires lookahead. Add a single token lookahead in the MCAsmLexer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201058 91177308-0d34-0410-b5e6-96231b3b80d8
* Use a consistent argument order in TargetLoweringObjectFile.Rafael Espindola2014-02-09
| | | | | | | | | These methods normally call each other and it is really annoying if the arguments are in different order. The more common rule was that the arguments specific to call are first (GV, Encoding, Suffix) and the auxiliary objects (Mang, TM) come after. This patch changes the exceptions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201044 91177308-0d34-0410-b5e6-96231b3b80d8
* Pass the Mangler by reference.Rafael Espindola2014-02-08
| | | | | | | It is never null and it is not used in casts, so there is no reason to use a pointer. This matches how we pass TM. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201025 91177308-0d34-0410-b5e6-96231b3b80d8
* Add LLVM_OVERRIDE to a few declarations.Rafael Espindola2014-02-08
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201022 91177308-0d34-0410-b5e6-96231b3b80d8
* Comment cleanup. Don't repeat the function name in the comment.Rafael Espindola2014-02-07
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201001 91177308-0d34-0410-b5e6-96231b3b80d8
* Comment cleanup. Don't repeat the function name in the comment.Rafael Espindola2014-02-07
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200999 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove training whitespace.Rafael Espindola2014-02-07
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200998 91177308-0d34-0410-b5e6-96231b3b80d8
* LLVM-1163: AAPCS-VFP violation when CPRC allocated to stackOliver Stannard2014-02-07
| | | | | | | | | | | | | | According to the AAPCS, when a CPRC is allocated to the stack, all other VFP registers should be marked as unavailable. I have also modified the rules for allocating non-CPRCs to the stack, to make it more explicit that all GPRs must be made unavailable. I cannot think of a case where the old version would produce incorrect answers, so there is no test for this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200970 91177308-0d34-0410-b5e6-96231b3b80d8
* X86: Resolve a long standing FIXME and properly isel pextr[bw].Jim Grosbach2014-02-07
| | | | | | | | | | | | | | | | | Generalize the AArch64 .td nodes for AssertZext and AssertSext. Use them to match the relevant pextr store instructions. The test widen_load-2.ll requires a slight change because with the stores gone, the remaining instructions are scheduled in a different order. Add test cases for SSE4 and AVX variants. Resolves rdar://13414672. Patch by Adam Nemet <anemet@apple.com>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200957 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove const_cast for STI when parsing inline asmDavid Peixotto2014-02-06
| | | | | | | | | | | | | | | | | | | | | | In a previous commit (r199818) we added a const_cast to an existing subtarget info instead of creating a new one so that we could reuse it when creating the TargetAsmParser for parsing inline assembly. This cast was necessary because we needed to reuse the existing STI to avoid generating incorrect code when the inline asm contained mode-switching directives (e.g. .code 16). The root cause of the failure was that there was an implicit sharing of the STI between the parser and the MCCodeEmitter. To fix a different but related issue, we now explicitly pass the STI to the MCCodeEmitter (see commits r200345-r200351). The const_cast is no longer necessary and we can now create a fresh STI for the inline asm parser to use. Differential Revision: http://llvm-reviews.chandlerc.com/D2709 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200929 91177308-0d34-0410-b5e6-96231b3b80d8
* [PM] Fix horrible typos that somehow didn't cause a failure in a C++11Chandler Carruth2014-02-06
| | | | | | | | | | | | build but spectacularly changed behavior of the C++98 build. =] This shows my one problem with not having unittests -- basic API expectations aren't well exercised by the integration tests because they *happen* to not come up, even though they might later. I'll probably add a basic unittest to complement the integration testing later, but I wanted to revive the bots. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200905 91177308-0d34-0410-b5e6-96231b3b80d8
* [PM] Add a new "lazy" call graph analysis pass for the new pass manager.Chandler Carruth2014-02-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The primary motivation for this pass is to separate the call graph analysis used by the new pass manager's CGSCC pass management from the existing call graph analysis pass. That analysis pass is (somewhat unfortunately) over-constrained by the existing CallGraphSCCPassManager requirements. Those requirements make it *really* hard to cleanly layer the needed functionality for the new pass manager on top of the existing analysis. However, there are also a bunch of things that the pass manager would specifically benefit from doing differently from the existing call graph analysis, and this new implementation tries to address several of them: - Be lazy about scanning function definitions. The existing pass eagerly scans the entire module to build the initial graph. This new pass is significantly more lazy, and I plan to push this even further to maximize locality during CGSCC walks. - Don't use a single synthetic node to partition functions with an indirect call from functions whose address is taken. This node creates a huge choke-point which would preclude good parallelization across the fanout of the SCC graph when we got to the point of looking at such changes to LLVM. - Use a memory dense and lightweight representation of the call graph rather than value handles and tracking call instructions. This will require explicit update calls instead of some updates working transparently, but should end up being significantly more efficient. The explicit update calls ended up being needed in many cases for the existing call graph so we don't really lose anything. - Doesn't explicitly model SCCs and thus doesn't provide an "identity" for an SCC which is stable across updates. This is essential for the new pass manager to work correctly. - Only form the graph necessary for traversing all of the functions in an SCC friendly order. This is a much simpler graph structure and should be more memory dense. It does limit the ways in which it is appropriate to use this analysis. I wish I had a better name than "call graph". I've commented extensively this aspect. This is still very much a WIP, in fact it is really just the initial bits. But it is about the fourth version of the initial bits that I've implemented with each of the others running into really frustrating problms. This looks like it will actually work and I'd like to split the actual complexity across commits for the sake of my reviewers. =] The rest of the implementation along with lots of wiring will follow somewhat more rapidly now that there is a good path forward. Naturally, this doesn't impact any of the existing optimizer. This code is specific to the new pass manager. A bunch of thanks are deserved for the various folks that have helped with the design of this, especially Nick Lewycky who actually sat with me to go through the fundamentals of the final version here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200903 91177308-0d34-0410-b5e6-96231b3b80d8
* Disable most IR-level transform passes on functions marked 'optnone'.Paul Robinson2014-02-06
| | | | | | | | | | Ideally only those transform passes that run at -O0 remain enabled, in reality we get as close as we reasonably can. Passes are responsible for disabling themselves, it's not the job of the pass manager to do it for them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200892 91177308-0d34-0410-b5e6-96231b3b80d8
* Add address space argument to allowsUnalignedMemoryAccess.Matt Arsenault2014-02-05
| | | | | | | On R600, some address spaces have more strict alignment requirements than others. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200887 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix layering StringRef copy using BumpPtrAllocator.Nick Kledzik2014-02-05
| | | | | | | | | | | Now to copy a string into a BumpPtrAllocator and get a StringRef to the copy: StringRef myCopy = myStr.copy(myAllocator); git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200885 91177308-0d34-0410-b5e6-96231b3b80d8
* [PM] Don't require analysis results to be const in the new pass manager.Chandler Carruth2014-02-05
| | | | | | | | | | I think this was just over-eagerness on my part. The analysis results need to often be non-const because they need to (in some cases at least) be updated by the transformation pass in order to remain correct. It also makes lazy analyses (a common case) needlessly annoying to write in order to make their entire state mutable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200881 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove support for not using .loc directives.Rafael Espindola2014-02-05
| | | | | | Clang itself was not using this. The only way to access it was via llc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200862 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert "Fix an invalid check for duplicate option categories."Rafael Espindola2014-02-05
| | | | | | | | This reverts commit r200853. It was causing clang/Analysis/checker-plugins.c to crash. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200858 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix an invalid check for duplicate option categories.Alexander Kornienko2014-02-05
| | | | | | | | | | | | | | | | | | | | Summary: The check performed in the comparator is invalid, as some STL implementations enforce strict weak ordering by calling the comparator with the same value. This check was also in a wrong place: the assertion would only fire when -help was used. The new check is performed each time the category is registered (we are not going to have thousands of them, so it's fine to do it in O(N^2)). Reviewers: jordan_rose Reviewed By: jordan_rose CC: cfe-commits, alexmc Differential Revision: http://llvm-reviews.chandlerc.com/D2699 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200853 91177308-0d34-0410-b5e6-96231b3b80d8
* AVX-512: Added intrinsic for cvtph2ps.Elena Demikhovsky2014-02-05
| | | | | | | | Added VPTESTNM instruction. Added a pattern to vselect (lit tests will follow). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200823 91177308-0d34-0410-b5e6-96231b3b80d8
* Add CheckChildInteger to ISelMatcher operations. Removes nearly 2000 bytes ↵Craig Topper2014-02-05
| | | | | | from X86 matcher table. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200821 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix configure to find arc4random via header files.Todd Fiala2014-02-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ISSUE: On Ubuntu 12.04 LTS, arc4random is provided by libbsd.so, which is a transitive dependency of libedit. If a system had libedit on it that was implemented in terms of libbsd.so, then the arc4random test, previously implemented as a linker test, would succeed with -ledit. However, on Ubuntu this would also require a #include <bsd/stdlib.h>. This caused a build breakage on configure-based Ubuntu 12.04 with libedit installed. FIX: This fix changes configure to test for arc4random by searching for it in the standard header files. On Ubuntu 12.04, this test now properly fails to find arc4random as it is not defined in the default header locations. It also tweaks the #define names to match the output of the header check command, which is slightly different than the linker function check #defines. I tested the following scenarios: (1) Ubuntu 12.04 without the libedit package [did not find arc4random, as expected] (2) Ubuntu 12.04 with libedit package [properly did not find arc4random, as expected] (3) Ubuntu 12.04 with most recent libedit, custom built, and not dependent on libbsd.so [properly did not find arc4random, as expected]. (4) FreeBSD 10.0B1 [properly found arc4random, as expected] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200819 91177308-0d34-0410-b5e6-96231b3b80d8
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