[lib/MC] - Set SHF_EXCLUDE flag for .dwo sections.
DWARF5 spec says about single file split case:
"The sections that do not require relocation, however, can be written
to the relocatable object (.o) file but ignored by the
the linker or they can be written to a separate DWARF object (.dwo) file
that need not be accessed by the linker."
Nice way to make linker to ignore them is to set SHF_EXCLUDE flag.
It seems to be not harmful to always set it for .dwo sections.
That is what this patch does.
Differential revision: https://reviews.llvm.org/D52303
llvm-svn: 342800
diff --git a/llvm/test/MC/ELF/exclude-debug-dwo.s b/llvm/test/MC/ELF/exclude-debug-dwo.s
new file mode 100644
index 0000000..c0f3b86
--- /dev/null
+++ b/llvm/test/MC/ELF/exclude-debug-dwo.s
@@ -0,0 +1,32 @@
+# RUN: llvm-mc -triple x86_64-pc-linux-gnu %s -filetype=obj -o %t.o
+# RUN: llvm-readobj -s --elf-output-style=GNU %t.o | FileCheck %s
+
+## Check we add SHF_EXCLUDE flag for .dwo debug sections.
+# CHECK: .debug_info.dwo {{.*}} E
+# CHECK: .debug_types.dwo {{.*}} E
+# CHECK: .debug_abbrev.dwo {{.*}} E
+# CHECK: .debug_str.dwo {{.*}} EMS
+# CHECK: .debug_line.dwo {{.*}} E
+# CHECK: .debug_loc.dwo {{.*}} E
+# CHECK: .debug_str_offsets.dwo {{.*}} E
+
+.section .debug_info.dwo
+nop
+
+.section .debug_types.dwo
+nop
+
+.section .debug_abbrev.dwo
+nop
+
+.section .debug_str.dwo
+nop
+
+.section .debug_line.dwo
+nop
+
+.section .debug_loc.dwo
+nop
+
+.section .debug_str_offsets.dwo
+nop