[lld] r248732 - [lld][MachO] Initial implementation of -flat_namespace and -undefined.
Lang Hames via llvm-commits
llvm-commits at lists.llvm.org
Mon Sep 28 13:25:15 PDT 2015
Author: lhames
Date: Mon Sep 28 15:25:14 2015
New Revision: 248732
URL: http://llvm.org/viewvc/llvm-project?rev=248732&view=rev
Log:
[lld][MachO] Initial implementation of -flat_namespace and -undefined.
This is a basic initial implementation of the -flat_namespace and
-undefined options for LLD-darwin. It ignores several subtlties,
but the result is close enough that we can now link LLVM (but not
clang) on Darwin and pass all regression tests.
Added:
lld/trunk/lib/ReaderWriter/MachO/FlatNamespaceFile.h
lld/trunk/test/mach-o/flat_namespace_undef_error.yaml
lld/trunk/test/mach-o/flat_namespace_undef_suppress.yaml
lld/trunk/test/mach-o/twolevel_namespace_undef_dynamic_lookup.yaml
lld/trunk/test/mach-o/twolevel_namespace_undef_warning_suppress.yaml
Modified:
lld/trunk/include/lld/ReaderWriter/MachOLinkingContext.h
lld/trunk/lib/Driver/DarwinLdDriver.cpp
lld/trunk/lib/Driver/DarwinLdOptions.td
lld/trunk/lib/ReaderWriter/MachO/MachOLinkingContext.cpp
lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp
lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp
Modified: lld/trunk/include/lld/ReaderWriter/MachOLinkingContext.h
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/include/lld/ReaderWriter/MachOLinkingContext.h?rev=248732&r1=248731&r2=248732&view=diff
==============================================================================
--- lld/trunk/include/lld/ReaderWriter/MachOLinkingContext.h (original)
+++ lld/trunk/include/lld/ReaderWriter/MachOLinkingContext.h Mon Sep 28 15:25:14 2015
@@ -63,6 +63,13 @@ public:
noDebugMap // -S option
};
+ enum class UndefinedMode {
+ error,
+ warning,
+ suppress,
+ dynamicLookup
+ };
+
/// Initializes the context to sane default values given the specified output
/// file type, arch, os, and minimum os version. This should be called before
/// other setXXX() methods.
@@ -204,6 +211,30 @@ public:
/// when linking a binary that does not use any of its symbols.
bool deadStrippableDylib() const { return _deadStrippableDylib; }
+ /// \brief Whether or not to use flat namespace.
+ ///
+ /// MachO usually uses a two-level namespace, where each external symbol
+ /// referenced by the target is associated with the dylib that will provide
+ /// the symbol's definition at runtime. Using flat namespace overrides this
+ /// behavior: the linker searches all dylibs on the command line and all
+ /// dylibs those original dylibs depend on, but does not record which dylib
+ /// an external symbol came from. At runtime dyld again searches all images
+ /// and uses the first definition it finds. In addition, any undefines in
+ /// loaded flat_namespace dylibs must be resolvable at build time.
+ bool useFlatNamespace() const { return _flatNamespace; }
+
+ /// \brief How to handle undefined symbols.
+ ///
+ /// Options are:
+ /// * error: Report an error and terminate linking.
+ /// * warning: Report a warning, but continue linking.
+ /// * suppress: Ignore and continue linking.
+ /// * dynamic_lookup: For use with -twolevel namespace: Records source dylibs
+ /// for symbols that are defined in a linked dylib at static link time.
+ /// Undefined symbols are handled by searching all loaded images at
+ /// runtime.
+ UndefinedMode undefinedMode() const { return _undefinedMode; }
+
/// \brief The path to the executable that will load the bundle at runtime.
///
/// When building a Mach-O bundle, this executable will be examined if there
@@ -218,6 +249,14 @@ public:
void setDeadStrippableDylib(bool deadStrippable) {
_deadStrippableDylib = deadStrippable;
}
+ void setUseFlatNamespace(bool flatNamespace) {
+ _flatNamespace = flatNamespace;
+ }
+
+ void setUndefinedMode(UndefinedMode undefinedMode) {
+ _undefinedMode = undefinedMode;
+ }
+
void setBundleLoader(StringRef loader) { _bundleLoader = loader; }
void setPrintAtoms(bool value=true) { _printAtoms = value; }
void setTestingFileUsage(bool value = true) {
@@ -301,6 +340,11 @@ public:
bool customAtomOrderer(const DefinedAtom *left, const DefinedAtom *right,
bool &leftBeforeRight) const;
+ /// Return the 'flat namespace' file. This is the file that supplies
+ /// atoms for otherwise undefined symbols when the -flat_namespace or
+ /// -undefined dynamic_lookup options are used.
+ File* flatNamespaceFile() const { return _flatNamespaceFile; }
+
private:
Writer &writer() const override;
mach_o::MachODylibFile* loadIndirectDylib(StringRef path);
@@ -349,6 +393,8 @@ private:
uint32_t _currentVersion;
StringRef _installName;
StringRefVector _rpaths;
+ bool _flatNamespace;
+ UndefinedMode _undefinedMode;
bool _deadStrippableDylib;
bool _printAtoms;
bool _testingFileUsage;
@@ -369,6 +415,7 @@ private:
std::unique_ptr<llvm::raw_fd_ostream> _dependencyInfo;
llvm::StringMap<std::vector<OrderFileNode>> _orderFiles;
unsigned _orderFileEntries;
+ File *_flatNamespaceFile;
};
} // end namespace lld
Modified: lld/trunk/lib/Driver/DarwinLdDriver.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/Driver/DarwinLdDriver.cpp?rev=248732&r1=248731&r2=248732&view=diff
==============================================================================
--- lld/trunk/lib/Driver/DarwinLdDriver.cpp (original)
+++ lld/trunk/lib/Driver/DarwinLdDriver.cpp Mon Sep 28 15:25:14 2015
@@ -751,6 +751,49 @@ bool DarwinLdDriver::parse(llvm::ArrayRe
}
}
+ // Handle -flat_namespace.
+ if (llvm::opt::Arg *ns =
+ parsedArgs.getLastArg(OPT_flat_namespace, OPT_twolevel_namespace)) {
+ if (ns->getOption().getID() == OPT_flat_namespace)
+ ctx.setUseFlatNamespace(true);
+ }
+
+ // Handle -undefined
+ if (llvm::opt::Arg *undef = parsedArgs.getLastArg(OPT_undefined)) {
+ MachOLinkingContext::UndefinedMode UndefMode;
+ if (StringRef(undef->getValue()).equals("error"))
+ UndefMode = MachOLinkingContext::UndefinedMode::error;
+ else if (StringRef(undef->getValue()).equals("warning"))
+ UndefMode = MachOLinkingContext::UndefinedMode::warning;
+ else if (StringRef(undef->getValue()).equals("suppress"))
+ UndefMode = MachOLinkingContext::UndefinedMode::suppress;
+ else if (StringRef(undef->getValue()).equals("dynamic_lookup"))
+ UndefMode = MachOLinkingContext::UndefinedMode::dynamicLookup;
+ else {
+ diagnostics << "error: invalid option to -undefined "
+ "[ warning | error | suppress | dynamic_lookup ]\n";
+ return false;
+ }
+
+ if (ctx.useFlatNamespace()) {
+ // If we're using -flat_namespace then 'warning', 'suppress' and
+ // 'dynamic_lookup' are all equivalent, so map them to 'suppress'.
+ if (UndefMode != MachOLinkingContext::UndefinedMode::error)
+ UndefMode = MachOLinkingContext::UndefinedMode::suppress;
+ } else {
+ // If we're using -twolevel_namespace then 'warning' and 'suppress' are
+ // illegal. Emit a diagnostic if they've been (mis)used.
+ if (UndefMode == MachOLinkingContext::UndefinedMode::warning ||
+ UndefMode == MachOLinkingContext::UndefinedMode::suppress) {
+ diagnostics << "error: can't use -undefined warning or suppress with "
+ "-twolevel_namespace\n";
+ return false;
+ }
+ }
+
+ ctx.setUndefinedMode(UndefMode);
+ }
+
// Handle -rpath <path>
if (parsedArgs.hasArg(OPT_rpath)) {
switch (ctx.outputMachOType()) {
Modified: lld/trunk/lib/Driver/DarwinLdOptions.td
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/Driver/DarwinLdOptions.td?rev=248732&r1=248731&r2=248732&view=diff
==============================================================================
--- lld/trunk/lib/Driver/DarwinLdOptions.td (original)
+++ lld/trunk/lib/Driver/DarwinLdOptions.td Mon Sep 28 15:25:14 2015
@@ -55,6 +55,19 @@ def order_file : Separate<["-"], "order_
MetaVarName<"<file-path>">,
HelpText<"re-order and move specified symbols to start of their section">,
Group<grp_opts>;
+def flat_namespace : Flag<["-"], "flat_namespace">,
+ HelpText<"Resolves symbols in any (transitively) linked dynamic libraries. "
+ "Source libraries are not recorded: dyld will re-search all "
+ "images at runtime and use the first definition found.">,
+ Group<grp_opts>;
+def twolevel_namespace : Flag<["-"], "twolevel_namespace">,
+ HelpText<"Resolves symbols in listed libraries only. Source libraries are "
+ "recorded in the symbol table.">,
+ Group<grp_opts>;
+def undefined : Separate<["-"], "undefined">,
+ MetaVarName<"<undefined>">,
+ HelpText<"Determines how undefined symbols are handled.">,
+ Group<grp_opts>;
// main executable options
def grp_main : OptionGroup<"opts">, HelpText<"MAIN EXECUTABLE OPTIONS">;
Added: lld/trunk/lib/ReaderWriter/MachO/FlatNamespaceFile.h
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/ReaderWriter/MachO/FlatNamespaceFile.h?rev=248732&view=auto
==============================================================================
--- lld/trunk/lib/ReaderWriter/MachO/FlatNamespaceFile.h (added)
+++ lld/trunk/lib/ReaderWriter/MachO/FlatNamespaceFile.h Mon Sep 28 15:25:14 2015
@@ -0,0 +1,61 @@
+//===- lib/ReaderWriter/MachO/FlatNamespaceFile.h -------------------------===//
+//
+// The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_READER_WRITER_MACHO_FLAT_NAMESPACE_FILE_H
+#define LLD_READER_WRITER_MACHO_FLAT_NAMESPACE_FILE_H
+
+#include "lld/Core/SharedLibraryFile.h"
+#include "llvm/Support/Debug.h"
+
+namespace lld {
+namespace mach_o {
+
+//
+// A FlateNamespaceFile instance may be added as a resolution source of last
+// resort, depending on how -flat_namespace and -undefined are set.
+//
+class FlatNamespaceFile : public SharedLibraryFile {
+public:
+ FlatNamespaceFile(const MachOLinkingContext &context, bool warnOnUndef)
+ : SharedLibraryFile("flat namespace") { }
+
+ const SharedLibraryAtom *exports(StringRef name,
+ bool dataSymbolOnly) const override {
+ _sharedLibraryAtoms.push_back(
+ new (allocator()) MachOSharedLibraryAtom(*this, name, getDSOName(),
+ false));
+
+ return _sharedLibraryAtoms.back();
+ }
+
+ StringRef getDSOName() const override { return "flat-namespace"; }
+
+ const AtomVector<DefinedAtom> &defined() const override {
+ return _noDefinedAtoms;
+ }
+ const AtomVector<UndefinedAtom> &undefined() const override {
+ return _noUndefinedAtoms;
+ }
+
+ const AtomVector<SharedLibraryAtom> &sharedLibrary() const override {
+ return _sharedLibraryAtoms;
+ }
+
+ const AtomVector<AbsoluteAtom> &absolute() const override {
+ return _noAbsoluteAtoms;
+ }
+
+private:
+ mutable AtomVector<SharedLibraryAtom> _sharedLibraryAtoms;
+};
+
+} // namespace mach_o
+} // namespace lld
+
+#endif // LLD_READER_WRITER_MACHO_EXECUTABLE_ATOMS_H
Modified: lld/trunk/lib/ReaderWriter/MachO/MachOLinkingContext.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/ReaderWriter/MachO/MachOLinkingContext.cpp?rev=248732&r1=248731&r2=248732&view=diff
==============================================================================
--- lld/trunk/lib/ReaderWriter/MachO/MachOLinkingContext.cpp (original)
+++ lld/trunk/lib/ReaderWriter/MachO/MachOLinkingContext.cpp Mon Sep 28 15:25:14 2015
@@ -10,6 +10,7 @@
#include "lld/ReaderWriter/MachOLinkingContext.h"
#include "ArchHandler.h"
#include "File.h"
+#include "FlatNamespaceFile.h"
#include "MachONormalizedFile.h"
#include "MachOPasses.h"
#include "lld/Core/ArchiveLibraryFile.h"
@@ -143,10 +144,12 @@ MachOLinkingContext::MachOLinkingContext
_doNothing(false), _pie(false), _arch(arch_unknown), _os(OS::macOSX),
_osMinVersion(0), _pageZeroSize(0), _pageSize(4096), _baseAddress(0),
_stackSize(0), _compatibilityVersion(0), _currentVersion(0),
+ _flatNamespace(false), _undefinedMode(UndefinedMode::error),
_deadStrippableDylib(false), _printAtoms(false), _testingFileUsage(false),
_keepPrivateExterns(false), _demangle(false), _archHandler(nullptr),
_exportMode(ExportMode::globals),
- _debugInfoMode(DebugInfoMode::addDebugMap), _orderFileEntries(0) {}
+ _debugInfoMode(DebugInfoMode::addDebugMap), _orderFileEntries(0),
+ _flatNamespaceFile(nullptr) {}
MachOLinkingContext::~MachOLinkingContext() {}
@@ -716,6 +719,15 @@ void MachOLinkingContext::createImplicit
// Let writer add output type specific extras.
writer().createImplicitFiles(result);
+
+ // If we're using flat namespace or undefinedMode is != error, add a
+ // FlatNamespaceFile instance. This will provide a SharedLibraryAtom for
+ // symbols that aren't defined elsewhere.
+ if (useFlatNamespace() && undefinedMode() != UndefinedMode::error) {
+ bool warnOnUndef = undefinedMode() == UndefinedMode::warning;
+ result.emplace_back(new mach_o::FlatNamespaceFile(*this, warnOnUndef));
+ _flatNamespaceFile = result.back().get();
+ }
}
Modified: lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp?rev=248732&r1=248731&r2=248732&view=diff
==============================================================================
--- lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp (original)
+++ lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileBinaryWriter.cpp Mon Sep 28 15:25:14 2015
@@ -1042,7 +1042,12 @@ void MachOFileLayout::buildBindInfo() {
_bindingInfo.append_byte(BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB
| entry.segIndex);
_bindingInfo.append_uleb128(entry.segOffset);
- _bindingInfo.append_byte(BIND_OPCODE_SET_DYLIB_ORDINAL_IMM | entry.ordinal);
+ if (entry.ordinal > 0)
+ _bindingInfo.append_byte(BIND_OPCODE_SET_DYLIB_ORDINAL_IMM |
+ (entry.ordinal & 0xF));
+ else
+ _bindingInfo.append_byte(BIND_OPCODE_SET_DYLIB_SPECIAL_IMM |
+ (entry.ordinal & 0xF));
_bindingInfo.append_byte(BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM);
_bindingInfo.append_string(entry.symbolName);
if (entry.addend != lastAddend) {
@@ -1062,7 +1067,12 @@ void MachOFileLayout::buildLazyBindInfo(
_lazyBindingInfo.append_byte(BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB
| entry.segIndex);
_lazyBindingInfo.append_uleb128Fixed(entry.segOffset, 5);
- _lazyBindingInfo.append_byte(BIND_OPCODE_SET_DYLIB_ORDINAL_IMM | entry.ordinal);
+ if (entry.ordinal > 0)
+ _lazyBindingInfo.append_byte(BIND_OPCODE_SET_DYLIB_ORDINAL_IMM |
+ (entry.ordinal & 0xF));
+ else
+ _lazyBindingInfo.append_byte(BIND_OPCODE_SET_DYLIB_SPECIAL_IMM |
+ (entry.ordinal & 0xF));
_lazyBindingInfo.append_byte(BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM);
_lazyBindingInfo.append_string(entry.symbolName);
_lazyBindingInfo.append_byte(BIND_OPCODE_DO_BIND);
Modified: lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp?rev=248732&r1=248731&r2=248732&view=diff
==============================================================================
--- lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp (original)
+++ lld/trunk/lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp Mon Sep 28 15:25:14 2015
@@ -855,7 +855,9 @@ std::error_code Util::addSymbols(const l
Symbol sym;
uint16_t desc = 0;
if (!rMode) {
- uint8_t ordinal = dylibOrdinal(dyn_cast<SharedLibraryAtom>(ai.atom));
+ uint8_t ordinal = 0;
+ if (!_ctx.useFlatNamespace())
+ ordinal = dylibOrdinal(dyn_cast<SharedLibraryAtom>(ai.atom));
llvm::MachO::SET_LIBRARY_ORDINAL(desc, ordinal);
}
sym.name = ai.atom->name();
@@ -953,16 +955,28 @@ void Util::addDependentDylibs(const lld:
DylibPathToInfo::iterator pos = _dylibInfo.find(loadPath);
if (pos == _dylibInfo.end()) {
DylibInfo info;
- info.ordinal = ordinal++;
+ bool flatNamespaceAtom = &slAtom->file() == _ctx.flatNamespaceFile();
+
+ // If we're in -flat_namespace mode (or this atom came from the flat
+ // namespace file under -undefined dynamic_lookup) then use the flat
+ // lookup ordinal.
+ if (flatNamespaceAtom || _ctx.useFlatNamespace())
+ info.ordinal = BIND_SPECIAL_DYLIB_FLAT_LOOKUP;
+ else
+ info.ordinal = ordinal++;
info.hasWeak = slAtom->canBeNullAtRuntime();
info.hasNonWeak = !info.hasWeak;
_dylibInfo[loadPath] = info;
- DependentDylib depInfo;
- depInfo.path = loadPath;
- depInfo.kind = llvm::MachO::LC_LOAD_DYLIB;
- depInfo.currentVersion = _ctx.dylibCurrentVersion(loadPath);
- depInfo.compatVersion = _ctx.dylibCompatVersion(loadPath);
- nFile.dependentDylibs.push_back(depInfo);
+
+ // Unless this was a flat_namespace atom, record the source dylib.
+ if (!flatNamespaceAtom) {
+ DependentDylib depInfo;
+ depInfo.path = loadPath;
+ depInfo.kind = llvm::MachO::LC_LOAD_DYLIB;
+ depInfo.currentVersion = _ctx.dylibCurrentVersion(loadPath);
+ depInfo.compatVersion = _ctx.dylibCompatVersion(loadPath);
+ nFile.dependentDylibs.push_back(depInfo);
+ }
} else {
if ( slAtom->canBeNullAtRuntime() )
pos->second.hasWeak = true;
@@ -1180,7 +1194,9 @@ uint32_t Util::fileFlags() {
if (_ctx.outputMachOType() == MH_OBJECT) {
return MH_SUBSECTIONS_VIA_SYMBOLS;
} else {
- uint32_t flags = MH_DYLDLINK | MH_NOUNDEFS | MH_TWOLEVEL;
+ uint32_t flags = MH_DYLDLINK;
+ if (!_ctx.useFlatNamespace())
+ flags |= MH_TWOLEVEL | MH_NOUNDEFS;
if ((_ctx.outputMachOType() == MH_EXECUTE) && _ctx.PIE())
flags |= MH_PIE;
if (_hasTLVDescriptors)
Added: lld/trunk/test/mach-o/flat_namespace_undef_error.yaml
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/mach-o/flat_namespace_undef_error.yaml?rev=248732&view=auto
==============================================================================
--- lld/trunk/test/mach-o/flat_namespace_undef_error.yaml (added)
+++ lld/trunk/test/mach-o/flat_namespace_undef_error.yaml Mon Sep 28 15:25:14 2015
@@ -0,0 +1,17 @@
+# RUN: not lld -flavor darwin -arch x86_64 -macosx_version_min 10.9 -flat_namespace -undefined error %s -o %t %p/Inputs/libSystem.yaml 2>&1 | FileCheck %s
+
+--- !native
+defined-atoms:
+ - name: _main
+ scope: global
+ content: [ E9, 00, 00, 00, 00 ]
+ alignment: 16
+ references:
+ - kind: branch32
+ offset: 1
+ target: _bar
+undefined-atoms:
+ - name: _bar
+
+# Make sure we error out for -flat_namespace -undefined error.
+# CHECK: Undefined symbol: : _bar
Added: lld/trunk/test/mach-o/flat_namespace_undef_suppress.yaml
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/mach-o/flat_namespace_undef_suppress.yaml?rev=248732&view=auto
==============================================================================
--- lld/trunk/test/mach-o/flat_namespace_undef_suppress.yaml (added)
+++ lld/trunk/test/mach-o/flat_namespace_undef_suppress.yaml Mon Sep 28 15:25:14 2015
@@ -0,0 +1,17 @@
+# RUN: lld -flavor darwin -arch x86_64 -macosx_version_min 10.9 -flat_namespace -undefined suppress %s -o %t %p/Inputs/libSystem.yaml
+#
+# Sanity check '-flat_namespace -undefined suppress'.
+# This should pass without error, even though '_bar' is undefined.
+
+--- !native
+defined-atoms:
+ - name: _main
+ scope: global
+ content: [ E9, 00, 00, 00, 00 ]
+ alignment: 16
+ references:
+ - kind: branch32
+ offset: 1
+ target: _bar
+undefined-atoms:
+ - name: _bar
Added: lld/trunk/test/mach-o/twolevel_namespace_undef_dynamic_lookup.yaml
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/mach-o/twolevel_namespace_undef_dynamic_lookup.yaml?rev=248732&view=auto
==============================================================================
--- lld/trunk/test/mach-o/twolevel_namespace_undef_dynamic_lookup.yaml (added)
+++ lld/trunk/test/mach-o/twolevel_namespace_undef_dynamic_lookup.yaml Mon Sep 28 15:25:14 2015
@@ -0,0 +1,17 @@
+# RUN: lld -flavor darwin -arch x86_64 -macosx_version_min 19.9 -twolevel_namespace -undefined dynamic_lookup %s -o %t %p/Inputs/libSystem.yaml
+#
+# Sanity check '-twolevel_namespace -undefined dynamic_lookup'.
+# This should pass without error, even though '_bar' is undefined.
+
+--- !native
+defined-atoms:
+ - name: _main
+ scope: global
+ content: [ E9, 00, 00, 00, 00 ]
+ alignment: 16
+ references:
+ - kind: branch32
+ offset: 1
+ target: _bar
+undefined-atoms:
+ - name: _bar
Added: lld/trunk/test/mach-o/twolevel_namespace_undef_warning_suppress.yaml
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/mach-o/twolevel_namespace_undef_warning_suppress.yaml?rev=248732&view=auto
==============================================================================
--- lld/trunk/test/mach-o/twolevel_namespace_undef_warning_suppress.yaml (added)
+++ lld/trunk/test/mach-o/twolevel_namespace_undef_warning_suppress.yaml Mon Sep 28 15:25:14 2015
@@ -0,0 +1,23 @@
+# RUN: not lld -flavor darwin -arch x86_64 -macosx_version_min 10.9 -twolevel_namespace -undefined warning %s -o %t %p/Inputs/libSystem.yaml 2>&1 | \
+# RUN: FileCheck --check-prefix=CHECK-WARNING %s
+# RUN: not lld -flavor darwin -arch x86_64 -macosx_version_min 10.9 -twolevel_namespace -undefined suppress %s -o %t %p/Inputs/libSystem.yaml 2>&1 | \
+# RUN: FileCheck --check-prefix=CHECK-SUPPRESS %s
+
+--- !native
+defined-atoms:
+ - name: _main
+ scope: global
+ content: [ E9, 00, 00, 00, 00 ]
+ alignment: 16
+ references:
+ - kind: branch32
+ offset: 1
+ target: _bar
+undefined-atoms:
+ - name: _bar
+
+# Make sure that the driver issues an error diagnostic about this combination
+# being invalid.
+#
+# CHECK-WARNING: can't use -undefined warning or suppress with -twolevel_namespace
+# CHECK-SUPPRESS: can't use -undefined warning or suppress with -twolevel_namespace
\ No newline at end of file
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