[LLVMbugs] [Bug 21823] New: 'nodebug' doesn't suppress variable info

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Dec 10 12:59:00 PST 2014


            Bug ID: 21823
           Summary: 'nodebug' doesn't suppress variable info
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: paul_robinson at playstation.sony.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The 'nodebug' attribute can be attached to a function or static/global
variable.  On a function, it will suppress the debug info for that function.
When attached to a variable, however, debug info for the variable still 

---- test.cpp ----
int __attribute__((nodebug)) i1 = 2;
---- script ----
clang -c -g test.cpp
llvm-dwarfdump -debug-dump=info test.o
---- output ----
nodebug.o:    file format ELF64-x86-64

.debug_info contents:
0x00000000: Compile Unit: length = 0x00000037 version = 0x0004 abbr_offset =
0x0000 addr_size = 0x08 (next unit at 0x0000003b)

0x0000000b: DW_TAG_compile_unit [1] *
              DW_AT_producer [DW_FORM_strp]    ( .debug_str[0x00000000] =
"clang version 3.6.0 (trunk 223919)")
              DW_AT_language [DW_FORM_data2]    (DW_LANG_C_plus_plus)
              DW_AT_name [DW_FORM_strp]    ( .debug_str[0x00000023] =
              DW_AT_stmt_list [DW_FORM_sec_offset]    (0x00000000)
              DW_AT_comp_dir [DW_FORM_strp]    ( .debug_str[0x0000002f] =

0x0000001e:   DW_TAG_variable [2]  
                DW_AT_name [DW_FORM_strp]    ( .debug_str[0x00000050] = "i1")
                DW_AT_type [DW_FORM_ref4]    (cu + 0x0033 => {0x00000033})
                DW_AT_external [DW_FORM_flag_present]    (true)
                DW_AT_decl_file [DW_FORM_data1]   
                DW_AT_decl_line [DW_FORM_data1]    (2)
                DW_AT_location [DW_FORM_exprloc]    (<0x9> 03 00 00 00 00 00 00
00 00 )

0x00000033:   DW_TAG_base_type [3]  
                DW_AT_name [DW_FORM_strp]    ( .debug_str[0x00000053] = "int")
                DW_AT_encoding [DW_FORM_data1]    (DW_ATE_signed)
                DW_AT_byte_size [DW_FORM_data1]    (0x04)

0x0000003a:   NULL

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