[Bug gdb/16201] New: internal error on a cygwin program linked against a DLL with no .data section

["smaximov at yahoo dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16201

            Bug ID: 16201
           Summary: internal error on a cygwin program linked against a
                    DLL with no .data section
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: critical
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: smaximov at yahoo dot com

An internal error in gdb prevents debugging any Cygwin program linked against a
DLL without a .data section:

/netrel/src/gdb-7.6.50-4/gdb/minsyms.c:885: internal-error: sect_index_data not
initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

/netrel/src/gdb-7.6.50-4/gdb/minsyms.c:885: internal-error: sect_index_data not
initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) n

Environment:

$ uname -a
CYGWIN_NT-6.1-WOW64 my-PC 1.7.25(0.270/5/3) 2013-08-31 20:39 i686 Cygwin


$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-pc-cygwin/4.8.2/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with:
/cygdrive/i/szsz/tmpp/cygwin64/gcc/gcc-4.8.2-1/src/gcc-4.8.2/configure
--srcdir=/cygdrive/i/szsz/tmpp/cygwin64/gcc/gcc-4.8.2-1/src/gcc-4.8.2
--prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
--libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var
--sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share
--docdir=/usr/share/doc/gcc -C --build=i686-pc-cygwin --host=i686-pc-cygwin
--target=i686-pc-cygwin --without-libiconv-prefix --without-libintl-prefix
--enable-shared --enable-shared-libgcc --enable-static
--enable-version-specific-runtime-libs --enable-bootstrap
--disable-__cxa_atexit --with-dwarf2 --with-arch=i686 --with-tune=generic
--disable-sjlj-exceptions
--enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ --enable-graphite
--enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm
--enable-libquadmath --enable-libquadmath-support --enable-libssp
--enable-libada --enable-libjava --enable-libgcj-sublibs --disable-java-awt
--disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld
--with-gnu-as --with-cloog-include=/usr/include/cloog-isl
--without-libiconv-prefix --without-libintl-prefix --with-system-zlib
Thread model: posix
gcc version 4.8.2 (GCC)



How-To-Repeat:

$ cat test1.c
int icudt49_dat(int);
int main()
{
    icudt49_dat(0);
    return 0;
}


$ gcc -g -L. -o test1 test1.c -licudt49


$ gdb --args test1
GNU gdb (GDB) 7.6.50.20130728-cvs (cygwin-special)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-cygwin".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
..
Reading symbols from /home/user/test/test1...done.
(gdb) ru
Starting program: /home/user/test/test1
[New Thread 12768.0x1ce4]
/netrel/src/gdb-7.6.50-4/gdb/minsyms.c:885: internal-error: sect_index_data not
initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

/netrel/src/gdb-7.6.50-4/gdb/minsyms.c:885: internal-error: sect_index_data not
initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) n


$ ldd test1.exe
        ntdll.dll => /cygdrive/c/Windows/SysWOW64/ntdll.dll (0x77320000)
        kernel32.dll => /cygdrive/c/Windows/syswow64/kernel32.dll (0x76950000)
        KERNELBASE.dll => /cygdrive/c/Windows/syswow64/KERNELBASE.dll
(0x753d0000)
        cygwin1.dll => /usr/bin/cygwin1.dll (0x61000000)
        icudt49.dll => /home/user/test/icudt49.dll (0x62c40000)


$ objdump -h test1.exe

test1.exe:     file format pei-i386

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000768  00401000  00401000  00000400  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, CODE, DATA
  1 .data         000000d8  00402000  00402000  00000c00  2**5
                  CONTENTS, ALLOC, LOAD, DATA
  2 .rdata        00000018  00403000  00403000  00000e00  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  3 .eh_frame     0000036c  00404000  00404000  00001000  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  4 .bss          00000110  00405000  00405000  00000000  2**5
                  ALLOC
  5 .idata        00000248  00406000  00406000  00001400  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  6 .debug_aranges 00000198  00407000  00407000  00001800  2**0
                  CONTENTS, READONLY, DEBUGGING
  7 .debug_info   00006366  00408000  00408000  00001a00  2**0
                  CONTENTS, READONLY, DEBUGGING
  8 .debug_abbrev 00000c33  0040f000  0040f000  00007e00  2**0
                  CONTENTS, READONLY, DEBUGGING
  9 .debug_line   00000cb5  00410000  00410000  00008c00  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .debug_str    00000043  00411000  00411000  00009a00  2**0
                  CONTENTS, READONLY, DEBUGGING
 11 .debug_loc    0000027f  00412000  00412000  00009c00  2**0
                  CONTENTS, READONLY, DEBUGGING
 12 .debug_ranges 00000018  00413000  00413000  0000a000  2**0
                  CONTENTS, READONLY, DEBUGGING


$ objdump -h icudt49.dll

icudt49.dll:     file format pei-i386

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .rdata        0111f4fa  10001000  10001000  00000400  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  1 .rsrc         00000458  11121000  11121000  0111fa00  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA

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