[Driver][Darwin] Pass -no_deduplicate to ld64
Recent versions of ld64 run a deduplicate pass, which is on by default.
Disable the pass by using -no_deduplicate in certain condition and
enhance total compile time.
rdar://problem/25455336
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@284798 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 647ac262003d853d8b431ed6ca7dbeff61678cd7)
diff --git a/include/clang/Driver/Job.h b/include/clang/Driver/Job.h
index 3366fc4..159bd9e 100644
--- a/include/clang/Driver/Job.h
+++ b/include/clang/Driver/Job.h
@@ -175,6 +175,7 @@
const list_type &getJobs() const { return Jobs; }
+ bool empty() const { return Jobs.empty(); }
size_type size() const { return Jobs.size(); }
iterator begin() { return Jobs.begin(); }
const_iterator begin() const { return Jobs.begin(); }
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index ee5a060..01af4ec 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -7744,6 +7744,29 @@
return false;
}
+/// \brief Pass -no_deduplicate to ld64 under certain conditions:
+///
+/// - Either -O0 or -O1 is explicitly specified
+/// - No -O option is specified *and* this is a compile+link (implicit -O0)
+///
+/// Also do *not* add -no_deduplicate when no -O option is specified and this
+/// is just a link (we can't imply -O0)
+static bool shouldLinkerNotDedup(bool IsLinkerOnlyAction, const ArgList &Args) {
+ if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+ if (A->getOption().matches(options::OPT_O0))
+ return true;
+ if (A->getOption().matches(options::OPT_O))
+ return llvm::StringSwitch<bool>(A->getValue())
+ .Case("1", true)
+ .Default(false);
+ return false; // OPT_Ofast & OPT_O4
+ }
+
+ if (!IsLinkerOnlyAction) // Implicit -O0 for compile+linker only.
+ return true;
+ return false;
+}
+
void darwin::Linker::AddLinkArgs(Compilation &C, const ArgList &Args,
ArgStringList &CmdArgs,
const InputInfoList &Inputs) const {
@@ -7800,6 +7823,10 @@
}
}
+ // ld64 version 262 and above run the deduplicate pass by default.
+ if (Version[0] >= 262 && shouldLinkerNotDedup(C.getJobs().empty(), Args))
+ CmdArgs.push_back("-no_deduplicate");
+
// Derived from the "link" spec.
Args.AddAllArgs(CmdArgs, options::OPT_static);
if (!Args.hasArg(options::OPT_static))
diff --git a/test/Driver/darwin-ld-dedup.c b/test/Driver/darwin-ld-dedup.c
new file mode 100644
index 0000000..a06ca7b
--- /dev/null
+++ b/test/Driver/darwin-ld-dedup.c
@@ -0,0 +1,46 @@
+// REQUIRES: system-darwin
+
+// -no_deduplicate is only present from ld64 version 262 and later.
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=261 -O0 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+
+// Add -no_deduplicate when either -O0 or -O1 is explicitly specified
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 -O0 2>&1 | FileCheck -check-prefix=LINK_NODEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 -O1 2>&1 | FileCheck -check-prefix=LINK_NODEDUP %s
+
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 -O2 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 -O3 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 -Os 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 -O4 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 -Ofast 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+
+// Add -no_deduplicate when no -O option is specified *and* this is a compile+link
+// (implicit -O0)
+// RUN: %clang -target x86_64-apple-darwin10 -### %s \
+// RUN: -mlinker-version=262 2>&1 | FileCheck -check-prefix=LINK_NODEDUP %s
+
+// Do *not* add -no_deduplicate when no -O option is specified and this is just a link
+// (since we can't imply -O0)
+// RUN: rm -f %t.o %t.bin
+// RUN: %clang -target x86_64-apple-darwin10 -c -o %t.o %s
+// RUN: %clang -target x86_64-apple-darwin10 %t.o -### -mlinker-version=262 \
+// RUN: -o %t.bin 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 %t.o -### -mlinker-version=262 \
+// RUN: -O0 -o %t.bin 2>&1 | FileCheck -check-prefix=LINK_NODEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 %t.o -### -mlinker-version=262 \
+// RUN: -O1 -o %t.bin 2>&1 | FileCheck -check-prefix=LINK_NODEDUP %s
+// RUN: %clang -target x86_64-apple-darwin10 %t.o -### -mlinker-version=262 \
+// RUN: -O2 -o %t.bin 2>&1 | FileCheck -check-prefix=LINK_DEDUP %s
+
+// LINK_NODEDUP: {{ld(.exe)?"}}
+// LINK_NODEDUP: "-no_deduplicate"
+
+// LINK_DEDUP: {{ld(.exe)?"}}
+// LINK_DEDUP-NOT: "-no_deduplicate"
