DebugInfo: Add a driver flag for DWARF debug_ranges base address specifier use.
Summary:
This saves a lot of relocations in optimized object files (at the cost
of some cost/increase in linked executable bytes), but gold's 32 bit
gdb-index support has a bug (
https://sourceware.org/bugzilla/show_bug.cgi?id=21894 ) so we can't
switch to this unconditionally. (& even if it weren't for that bug, one
might argue that some users would want to optimize in one direction or
the other - prioritizing object size or linked executable size)
Differential Revision: https://reviews.llvm.org/D54243
llvm-svn: 346789
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 8de20f6..0e23aae 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -3188,6 +3188,11 @@
? "-gpubnames"
: "-ggnu-pubnames");
+ if (Args.hasFlag(options::OPT_fdebug_ranges_base_address,
+ options::OPT_fno_debug_ranges_base_address, false)) {
+ CmdArgs.push_back("-fdebug-ranges-base-address");
+ }
+
// -gdwarf-aranges turns on the emission of the aranges section in the
// backend.
// Always enabled for SCE tuning.