Driver/Darwin: When invoking the linker, automatically pass -object_path_lto so
that the linker has a place to put the temporary object file and can leave it
around (for the driver to clean up). This is important so that the object file
references in the debug info are preserved for possible use by dsymutil.
- <rdar://problem/8294279> executable has no debug symbols when compiled with LTO
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133543 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index b3cef73..41efccf 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -2907,6 +2907,17 @@
CmdArgs.push_back("-demangle");
}
+ // If we are using LTO, then automatically create a temporary file path for
+ // the linker to use, so that it's lifetime will extend past a possible
+ // dsymutil step.
+ if (Version[0] >= 100 && D.IsUsingLTO(Args)) {
+ const char *TmpPath = C.getArgs().MakeArgString(
+ D.GetTemporaryPath(types::getTypeTempSuffix(types::TY_Object)));
+ C.addTempFile(TmpPath);
+ CmdArgs.push_back("-object_path_lto");
+ CmdArgs.push_back(TmpPath);
+ }
+
// Derived from the "link" spec.
Args.AddAllArgs(CmdArgs, options::OPT_static);
if (!Args.hasArg(options::OPT_static))
diff --git a/test/Driver/darwin-ld.c b/test/Driver/darwin-ld.c
index f6ea829..a87de54 100644
--- a/test/Driver/darwin-ld.c
+++ b/test/Driver/darwin-ld.c
@@ -92,3 +92,11 @@
// LINK_OLDER_NODEMANGLE: {{ld(.exe)?"}}
// LINK_OLDER_NODEMANGLE-NOT: "-demangle"
// LINK_OLDER_NODEMANGLE: "-lSystem"
+
+// RUN: %clang -ccc-host-triple x86_64-apple-darwin10 -### %t.o \
+// RUN: -mlinker-version=101 -flto 2> %t.log
+// RUN: cat %t.log
+// RUN: FileCheck -check-prefix=LINK_OBJECT_LTO_PATH %s < %t.log
+//
+// LINK_OBJECT_LTO_PATH: {{ld(.exe)?"}}
+// LINK_OBJECT_LTO_PATH: "-object_path_lto"