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/test/CodeGen/debug-info-ranges-base-address.c b/clang/test/CodeGen/debug-info-ranges-base-address.c
new file mode 100644
index 0000000..dee7cc5
--- /dev/null
+++ b/clang/test/CodeGen/debug-info-ranges-base-address.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -emit-llvm -debug-info-kind=limited %s -o - | FileCheck --check-prefix=NORNGBSE %s
+// RUN: %clang_cc1 -emit-llvm -debug-info-kind=limited %s -o - -fdebug-ranges-base-address | FileCheck --check-prefix=RNGBSE %s
+
+// NORNGBSE-NOT: rangesBaseAddress
+// RNGBSE: !DICompileUnit({{.*}}, rangesBaseAddress: true
+
+void f1() {
+}
+
diff --git a/clang/test/Driver/debug-options.c b/clang/test/Driver/debug-options.c
index ea9b7e7..e638298 100644
--- a/clang/test/Driver/debug-options.c
+++ b/clang/test/Driver/debug-options.c
@@ -165,6 +165,10 @@
// RUN: %clang -### -c -gsplit-dwarf %s 2>&1 | FileCheck -check-prefix=GPUB %s
// RUN: %clang -### -c -gsplit-dwarf -gno-pubnames %s 2>&1 | FileCheck -check-prefix=NOPUB %s
//
+// RUN: %clang -### -c -fdebug-ranges-base-address %s 2>&1 | FileCheck -check-prefix=RNGBSE %s
+// RUN: %clang -### -c %s 2>&1 | FileCheck -check-prefix=NORNGBSE %s
+// RUN: %clang -### -c -fdebug-ranges-base-address -fno-debug-ranges-base-address %s 2>&1 | FileCheck -check-prefix=NORNGBSE %s
+//
// RUN: %clang -### -c -glldb %s 2>&1 | FileCheck -check-prefix=GPUB %s
// RUN: %clang -### -c -glldb -gno-pubnames %s 2>&1 | FileCheck -check-prefix=NOPUB %s
//
@@ -282,6 +286,9 @@
//
// PUB: -gpubnames
//
+// RNGBSE: -fdebug-ranges-base-address
+// NORNGBSE-NOT: -fdebug-ranges-base-address
+//
// GARANGE: -generate-arange-section
//
// FDTS: "-mllvm" "-generate-type-units"