(gdb) break TEnv::TEnv
Breakpoint 1 at 0x7ffff776f098: TEnv::TEnv. (2 locations)
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /autofs/nccs-svm1_home1/wshi/ROOT/v5-34-00-patches/bin/root.exe 
warning: File "/autofs/nccs-svm1_sw/summit/gcc/7.5.0-2/lib64/libstdc++.so.6.0.24-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/power9/libthread_db.so.1".

Breakpoint 1, 0x00007ffff7d78440 in TEnv::TEnv(char const*)@plt () from /ccs/home/wshi/ROOT/v5-34-00-patches/lib/libCore.so.5.34
(gdb) step
Single stepping until exit from function _ZN4TEnvC1EPKc@plt,
which has no line number information.
0x00007ffff7d6f130 in __glink_PLTresolve () from /ccs/home/wshi/ROOT/v5-34-00-patches/lib/libCore.so.5.34
(gdb) 
Single stepping until exit from function __glink_PLTresolve,
which has no line number information.

Breakpoint 1, TEnv::TEnv (this=0x1005ef10, name=0x7ffff7d7f0e0 ".rootrc") at /autofs/nccs-svm1_home1/wshi/ROOT/v5-34-00-patches/core/base/src/TEnv.cxx:380
380	TEnv::TEnv(const char *name)
(gdb) 
TObject::TObject (this=0x1005ef10) at /autofs/nccs-svm1_home1/wshi/ROOT/v5-34-00-patches/core/base/src/TObject.cxx:65
65	TObject::TObject() : fBits(kNotDeleted) //Need to leave FUniqueID unset
(gdb) next
74	   if (TStorage::FilledByObjectAlloc(&fUniqueID))
(gdb) 
75	      fBits |= kIsOnHeap;
(gdb) next
77	   fUniqueID = 0;
(gdb) next
79	   if (fgObjectStat) TObjectTable::AddObj(this);
(gdb) next
80	}
(gdb) next
TEnv::TEnv (this=0x1005ef10, name=0x7ffff7d7f0e0 ".rootrc") at /autofs/nccs-svm1_home1/wshi/ROOT/v5-34-00-patches/core/base/src/TEnv.cxx:391
391	   fIgnoreDup = kFALSE;
(gdb) next
393	   if (!name || !strlen(name) || !gSystem)
(gdb) p name
$1 = 0x7ffff7d7f0e0 ".rootrc"
(gdb) p gSystem
$2 = (TSystem *) 0x1005c650
(gdb) x 0x1005c650
0x1005c650:	0xf7f2d2c8
(gdb) x 0x7ffff7d7f0e0
0x7ffff7d7f0e0:	0x6f6f722e
(gdb) next
396	      fTable  = new THashList(1000);
(gdb) p fTable
$3 = (THashList *) 0x9999999999999999
(gdb) x 0x9999999999999999
0x9999999999999999:	Cannot access memory at address 0x9999999999999999
(gdb) next
397	      fRcName = name;
(gdb) p name
$4 = 0x7ffff7d7f0e0 ".rootrc"
(gdb) p fRcName 
$5 = {_vptr.TString = 0x7ffff7f17bb0 <vtable for TString+16>, fRep = {{fLong = {fCap = 0, fSize = 0, fData = 0x0}, fShort = {fSize = 0 '\000', 
        fData = '\000' <repeats 14 times>}, fRaw = {fWords = {0, 0, 0, 0}}}}, static fgIsA = {_M_b = {_M_p = 0x0}}}
(gdb) next
399	      TString sname = "system";
(gdb) p sname
$6 = {_vptr.TString = 0x7fffffffb890, fRep = {{fLong = {fCap = -18288, fSize = 32767, fData = 0xfffffffffeff0000 <error: Cannot access memory at address 0xfffffffffeff0000>}, 
      fShort = {fSize = 144 '\220', fData = "\270\377\377\377\177\000\000\000\000\377\376\377\377\377\377"}, fRaw = {fWords = {-18288, 32767, -16842752, -1}}}}, static fgIsA = {
    _M_b = {_M_p = 0x0}}}
(gdb) next
400	      sname += name;
(gdb) p name 
$7 = 0x7ffff7d7f0e0 ".rootrc"
(gdb) p sname
$8 = {_vptr.TString = 0x7ffff7f17bb0 <vtable for TString+16>, fRep = {{fLong = {fCap = 1937339142, fSize = 7169396, 
        fData = 0xfffffffffeff0000 <error: Cannot access memory at address 0xfffffffffeff0000>}, fShort = {fSize = 6 '\006', 
        fData = "system\000\000\000\377\376\377\377\377\377"}, fRaw = {fWords = {1937339142, 7169396, -16842752, -1}}}}, static fgIsA = {_M_b = {_M_p = 0x0}}}
(gdb) next
404	      TString etc = gRootDir;
(gdb) p gRootDir
$9 = 0x1005db38 "."
(gdb) p ROOTETCDIR
No symbol "ROOTETCDIR" in current context.
(gdb) p etc
$10 = warning: can't find linker symbol for virtual table for `TString' value
{_vptr.TString = 0x7ffff7fcc588 <_dl_runtime_resolve+72>, fRep = {{fLong = {fCap = -18352, fSize = 32767, fData = 0x1005ef10 "8\026\362\367\377\177"}, fShort = {
        fSize = 80 'P', fData = "\270\377\377\377\177\000\000\020\357\005\020\000\000\000"}, fRaw = {fWords = {-18352, 32767, 268824336, 0}}}}, static fgIsA = {_M_b = {
      _M_p = 0x0}}}
(gdb) next
408	      etc += "/etc";
(gdb) p etc
$11 = {_vptr.TString = 0x7ffff7f17bb0 <vtable for TString+16>, fRep = {{fLong = {fCap = -16765439, fSize = 32767, fData = 0x1005ef10 "8\026\362\367\377\177"}, fShort = {
        fSize = 1 '\001', fData = ".\000\377\377\177\000\000\020\357\005\020\000\000\000"}, fRaw = {fWords = {-16765439, 32767, 268824336, 0}}}}, static fgIsA = {_M_b = {
      _M_p = 0x0}}}
(gdb) next
414	      char *s = gSystem->ConcatFileName(etc, sname);
(gdb) p etc
$12 = {_vptr.TString = 0x7ffff7f17bb0 <vtable for TString+16>, fRep = {{fLong = {fCap = 1697590789, fSize = 25460, fData = 0x1005ef10 "8\026\362\367\377\177"}, fShort = {
        fSize = 5 '\005', fData = "./etc\000\000\020\357\005\020\000\000\000"}, fRaw = {fWords = {1697590789, 25460, 268824336, 0}}}}, static fgIsA = {_M_b = {_M_p = 0x0}}}
(gdb) p sname
$13 = {_vptr.TString = 0x7ffff7f17bb0 <vtable for TString+16>, fRep = {{fLong = {fCap = 1937339149, fSize = 778921332, 
        fData = 0xff006372746f6f72 <error: Cannot access memory at address 0xff006372746f6f72>}, fShort = {fSize = 13 '\r', fData = "system.rootrc\000\377"}, fRaw = {fWords = {
          1937339149, 778921332, 1953460082, -16751758}}}}, static fgIsA = {_M_b = {_M_p = 0x0}}}
(gdb) p s
$14 = 0x1005ef10 "8\026\362\367\377\177"
(gdb) x 0x1005ef10
0x1005ef10:	0xf7f21638
(gdb) next
416	      ReadFile(s, kEnvGlobal);
(gdb) p s
$15 = 0x1005eef0 ""
(gdb) x 0x1005ef10
0x1005ef10:	0xf7f21638
(gdb) p !s
$16 = false