[LLVMbugs] [Bug 4240] New: clang: broken debug info for restrict

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4240

           Summary: clang: broken debug info for restrict
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: edwintorok at gmail.com
                CC: llvmbugs at cs.uiuc.edu, rdivacky at freebsd.org


Created an attachment (id=3010)
 --> (http://llvm.org/bugs/attachment.cgi?id=3010)
gnuregex.i

clang compiled gnuregex.i, cannot breakpoint in re_compile_internal, or
stacktrace into that function, because gdb shows a dwarf error:

Die: DW_TAG_restrict_type (abbrev = 33, offset = 27216)
        has children: FALSE
        attributes:
        DW_AT_type (DW_FORM_ref4) constant: 16237
Dwarf Error: Cannot find type of die [in module
/usr/obj/usr/src/gnu/lib/libregex/libgnuregex.so.4]
(gdb) bt
#0  0x280a9f4c in re_string_construct_common (str=0x0, len=3, pstr=0x280b3124,
trans=0xbfbfe860 "", icase=-1077941050, dfa=0x3) at regex_internal.c:192
 #1  0x280aa577 in re_string_construct (pstr=0x280b3124, str=0x0, len=3,
trans=0xbfbfe860 "", icase=-1077941050, dfa=0x3) at regex_internal.c:87
 Die: DW_TAG_restrict_type (abbrev = 33, offset = 48651)
        has children: FALSE
        attributes:
                DW_AT_type (DW_FORM_ref4) constant: 12449
Dwarf Error: Cannot find type of die [in module
/usr/obj/usr/src/gnu/lib/libregex/libgnuregex.so.4]

Preprocessed test file attached.
Compile on FreeBSD 32-bit as:
clang gnuregex.i -o x.so -^Cared -fPIC -DPIC -march=native -std=gnu99 -O0 -g

Then try to breakpoint at re_compile_internal, gdb refuses due to dwarf error.

When I remove all the restrict qualifiers from the gnuregex.i, gdb can
breakpoint and stacktrace that function.

Sorry if this bugreport is a bit sketchy. 
Please ask if you need more information.


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