vsk created this revision.
While building a project with code coverage enabled, we can link in
dependencies which export a weak definition of __llvm_profile_filename.
After r306710, linking in the profiling runtime could pull in a weak
definition of this symbol from a dependency, instead of from within the
runtime's archive.
This inconsistency causes issues during API verification, and is also a
practical problem (the symbol would go missing were the dependent dylib
to be switched out). Introduce a LinkFirst runtime link option to make
sure we always search the profiling runtime for this symbol first.
rdar://problem/33271080
https://reviews.llvm.org/D35385
Files:
lib/Driver/ToolChains/Darwin.cpp
lib/Driver/ToolChains/Darwin.h
test/Driver/darwin-ld.c
Index: test/Driver/darwin-ld.c
===================================================================
--- test/Driver/darwin-ld.c
+++ test/Driver/darwin-ld.c
@@ -341,3 +341,13 @@
// RUN: %clang -target x86_64-apple-darwin12 %t.o -fsave-optimization-record -fprofile-instr-use=blah -### -o foo/bar.out 2> %t.log
// RUN: FileCheck -check-prefix=PASS_REMARKS_WITH_HOTNESS %s < %t.log
// PASS_REMARKS_WITH_HOTNESS: "-mllvm" "-lto-pass-remarks-output" "-mllvm" "foo/bar.out.opt.yaml" "-mllvm" "-lto-pass-remarks-with-hotness"
+
+// RUN: %clang -target x86_64-apple-ios6.0 -miphoneos-version-min=6.0 -fprofile-instr-generate -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
+// RUN: %clang -target x86_64-apple-darwin12 -fprofile-instr-generate -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
+// RUN: %clang -target i386-apple-darwin9 -fprofile-instr-generate -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
+// RUN: %clang -target arm64-apple-ios5.0 -miphoneos-version-min=5.0 -fprofile-instr-generate -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_PROFILE_FIRST %s < %t.log
+// LINK_PROFILE_FIRST: {{ld(.exe)?"}} "{{[^"]+}}libclang_rt.profile_{{[a-z]+}}.a"
Index: lib/Driver/ToolChains/Darwin.h
===================================================================
--- lib/Driver/ToolChains/Darwin.h
+++ lib/Driver/ToolChains/Darwin.h
@@ -152,8 +152,12 @@
llvm::opt::ArgStringList &CmdArgs) const {}
/// Add the linker arguments to link the compiler runtime library.
+ ///
+ /// FIXME: This API is intended for use with embedded libraries only, and is
+ /// misleadingly named.
virtual void AddLinkRuntimeLibArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const;
+
virtual void AddFuzzerLinkArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const;
@@ -171,10 +175,26 @@
/// Is the target either iOS or an iOS simulator?
bool isTargetIOSBased() const { return false; }
+ /// Options to control how a runtime library is linked.
+ enum RuntimeLinkOptions : unsigned {
+ // Link the library in even if it can't be found in the VFS.
+ RLO_AlwaysLink = 1 << 0,
+
+ // Use the embedded runtime from the macho_embedded directory.
+ RLO_IsEmbedded = 1 << 1,
+
+ // Emit rpaths for @executable_path as well as the resource directory.
+ RLO_AddRPath = 1 << 2,
+
+ //< Link the library in before any others.
+ RLO_FirstLink = 1 << 3,
+ };
+
+ /// Add a runtime library to the list of items to link.
void AddLinkRuntimeLib(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
- StringRef DarwinLibName, bool AlwaysLink = false,
- bool IsEmbedded = false, bool AddRPath = false) const;
+ StringRef DarwinLibName,
+ RuntimeLinkOptions Opts = RuntimeLinkOptions()) const;
/// Add any profiling runtime libraries that are needed. This is essentially a
/// MachO specific version of addProfileRT in Tools.cpp.
Index: lib/Driver/ToolChains/Darwin.cpp
===================================================================
--- lib/Driver/ToolChains/Darwin.cpp
+++ lib/Driver/ToolChains/Darwin.cpp
@@ -493,7 +493,7 @@
if (getToolChain().getSanitizerArgs().needsSafeStackRt()) {
getMachOToolChain().AddLinkRuntimeLib(Args, CmdArgs,
"libclang_rt.safestack_osx.a",
- /*AlwaysLink=*/true);
+ toolchains::Darwin::RLO_AlwaysLink);
}
Args.AddAllArgs(CmdArgs, options::OPT_L);
@@ -897,25 +897,31 @@
}
void MachO::AddLinkRuntimeLib(const ArgList &Args, ArgStringList &CmdArgs,
- StringRef DarwinLibName, bool AlwaysLink,
- bool IsEmbedded, bool AddRPath) const {
+ StringRef DarwinLibName,
+ RuntimeLinkOptions Opts) const {
SmallString<128> Dir(getDriver().ResourceDir);
- llvm::sys::path::append(Dir, "lib", IsEmbedded ? "macho_embedded" : "darwin");
+ llvm::sys::path::append(
+ Dir, "lib", (Opts & RLO_IsEmbedded) ? "macho_embedded" : "darwin");
SmallString<128> P(Dir);
llvm::sys::path::append(P, DarwinLibName);
// For now, allow missing resource libraries to support developers who may
// not have compiler-rt checked out or integrated into their build (unless
// we explicitly force linking with this library).
- if (AlwaysLink || getVFS().exists(P))
- CmdArgs.push_back(Args.MakeArgString(P));
+ if ((Opts & RLO_AlwaysLink) || getVFS().exists(P)) {
+ const char *LibArg = Args.MakeArgString(P);
+ if (Opts & RLO_FirstLink)
+ CmdArgs.insert(CmdArgs.begin(), LibArg);
+ else
+ CmdArgs.push_back(LibArg);
+ }
// Adding the rpaths might negatively interact when other rpaths are involved,
// so we should make sure we add the rpaths last, after all user-specified
// rpaths. This is currently true from this place, but we need to be
// careful if this function is ever called before user's rpaths are emitted.
- if (AddRPath) {
+ if (Opts & RLO_AddRPath) {
assert(DarwinLibName.endswith(".dylib") && "must be a dynamic library");
// Add @executable_path to rpath to support having the dylib copied with
@@ -996,20 +1002,20 @@
ArgStringList &CmdArgs) const {
if (!needsProfileRT(Args)) return;
- AddLinkRuntimeLib(Args, CmdArgs, (Twine("libclang_rt.profile_") +
- getOSLibraryNameSuffix() + ".a").str(),
- /*AlwaysLink*/ true);
+ AddLinkRuntimeLib(
+ Args, CmdArgs,
+ (Twine("libclang_rt.profile_") + getOSLibraryNameSuffix() + ".a").str(),
+ RuntimeLinkOptions(RLO_AlwaysLink | RLO_FirstLink));
}
void DarwinClang::AddLinkSanitizerLibArgs(const ArgList &Args,
ArgStringList &CmdArgs,
StringRef Sanitizer) const {
- AddLinkRuntimeLib(
- Args, CmdArgs,
- (Twine("libclang_rt.") + Sanitizer + "_" +
- getOSLibraryNameSuffix() + "_dynamic.dylib").str(),
- /*AlwaysLink*/ true, /*IsEmbedded*/ false,
- /*AddRPath*/ true);
+ AddLinkRuntimeLib(Args, CmdArgs,
+ (Twine("libclang_rt.") + Sanitizer + "_" +
+ getOSLibraryNameSuffix() + "_dynamic.dylib")
+ .str(),
+ RuntimeLinkOptions(RLO_AlwaysLink | RLO_AddRPath));
}
ToolChain::RuntimeLibType DarwinClang::GetRuntimeLibType(
@@ -1059,7 +1065,7 @@
StringRef OS = isTargetMacOS() ? "osx" : "iossim";
AddLinkRuntimeLib(Args, CmdArgs,
(Twine("libclang_rt.stats_client_") + OS + ".a").str(),
- /*AlwaysLink=*/true);
+ RLO_AlwaysLink);
AddLinkSanitizerLibArgs(Args, CmdArgs, "stats");
}
if (Sanitize.needsEsanRt())
@@ -1709,7 +1715,7 @@
: "soft";
CompilerRT += Args.hasArg(options::OPT_fPIC) ? "_pic.a" : "_static.a";
- AddLinkRuntimeLib(Args, CmdArgs, CompilerRT, false, true);
+ AddLinkRuntimeLib(Args, CmdArgs, CompilerRT, RLO_IsEmbedded);
}
bool Darwin::isAlignedAllocationUnavailable() const {
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