[Bug debug/37410] New: DW_TAG_imported_module is not in its DW_TAG_lexical_block

[jan dot kratochvil at redhat dot com]

DW_TAG_imported_module (c++ `using namespace') has validity only in the same
block in which they are stated.  It works right for the compiled code but it
gets defined for the whole function in DWARF.

DW_TAG_imported_module should be located in DW_TAG_lexical_block.  Without the
`int block_create;'  declaration the whole DW_TAG_lexical_block is missing
there so it should be created when needed.

The testcase produces:
1
2

Tests on Fedora:
compat-gcc-34-c++-3.4.6-9.x86_64 has no DW_TAG_imported_module there at all.
gcc-4.3.2-3.x86_64 and gcc-4.1.2-33.x86_64 produce the output below.

 <1><6f>: Abbrev Number: 5 (DW_TAG_subprogram)
    <70>   DW_AT_external    : 1        
    <71>   DW_AT_name        : (indirect string, offset: 0x7f): main    
    <75>   DW_AT_decl_file   : 1        
    <76>   DW_AT_decl_line   : 13       
    <77>   DW_AT_type        : <0x57>   
    <7b>   DW_AT_low_pc      : 0x4005ac 
    <83>   DW_AT_high_pc     : 0x4005fc 
    <8b>   DW_AT_frame_base  : 0x0      (location list)
    <8f>   DW_AT_sibling     : <0xf2>   
 <2><93>: Abbrev Number: 6 (DW_TAG_imported_module)
    <94>   DW_AT_decl_file   : 1        
    <95>   DW_AT_decl_line   : 19       
    <96>   DW_AT_import      : <0xf2>   [Abbrev Number: 11 (DW_TAG_namespace)]
 <2><9a>: Abbrev Number: 6 (DW_TAG_imported_module)
    <9b>   DW_AT_decl_file   : 1        
    <9c>   DW_AT_decl_line   : 27       
    <9d>   DW_AT_import      : <0x10e>  [Abbrev Number: 11 (DW_TAG_namespace)]
 <2><a1>: Abbrev Number: 7 (DW_TAG_variable)
    <a2>   DW_AT_name        : x        
    <a4>   DW_AT_decl_file   : 1        
    <a5>   DW_AT_decl_line   : 15       
    <a6>   DW_AT_type        : <0x57>   
    <aa>   DW_AT_location    : 2 byte block: 91 64      (DW_OP_fbreg: -28)
 <2><ad>: Abbrev Number: 8 (DW_TAG_lexical_block)
    <ae>   DW_AT_low_pc      : 0x4005b4 
    <b6>   DW_AT_high_pc     : 0x4005d2 
    <be>   DW_AT_sibling     : <0xd1>   
 <3><c2>: Abbrev Number: 9 (DW_TAG_variable)  
    <c3>   DW_AT_name        : (indirect string, offset: 0x32): block_create    
    <c7>   DW_AT_decl_file   : 1        
    <c8>   DW_AT_decl_line   : 18       
    <c9>   DW_AT_type        : <0x57>   
    <cd>   DW_AT_location    : 2 byte block: 91 68      (DW_OP_fbreg: -24)
 <2><d1>: Abbrev Number: 10 (DW_TAG_lexical_block)
    <d2>   DW_AT_low_pc      : 0x4005d2 
    <da>   DW_AT_high_pc     : 0x4005f0 
 <3><e2>: Abbrev Number: 9 (DW_TAG_variable)
    <e3>   DW_AT_name        : (indirect string, offset: 0x32): block_create    
    <e7>   DW_AT_decl_file   : 1        
    <e8>   DW_AT_decl_line   : 26       
    <e9>   DW_AT_type        : <0x57>   
    <ed>   DW_AT_location    : 2 byte block: 91 6c      (DW_OP_fbreg: -20)


-- 
           Summary: DW_TAG_imported_module is not in its
                    DW_TAG_lexical_block
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jan dot kratochvil at redhat dot com
 GCC build triplet: x86_64-fedora-linux-gnu
  GCC host triplet: x86_64-fedora-linux-gnu
GCC target triplet: x86_64-fedora-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37410