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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

llvm-svn: 133543
This commit is contained in:
Daniel Dunbar 2011-06-21 20:55:11 +00:00
parent 8f1fe5b5c3
commit ef889c7c9b
2 changed files with 19 additions and 0 deletions
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11
clang/lib/Driver/Tools.cpp
View File

@ -2907,6 +2907,17 @@ void darwin::Link::AddLinkArgs(Compilation &C,
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))

8
clang/test/Driver/darwin-ld.c
View File

@ -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"