$ gdb --interpreter=mi ~/Downloads/struct-test.eclipse-debugger/StructTest/Debug/StructTest.exe
=thread-group-added,id="i1"
~"GNU gdb (GDB) 7.6.1\n"
~"Copyright (C) 2013 Free Software Foundation, Inc.\n"
~"License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.  Type \"show copying\"\nand \"show warranty\" for details.\n"
~"This GDB was configured as \"mingw32\".\nFor bug reporting instructions, please see:\n"
~"<http://www.gnu.org/software/gdb/bugs/>...\n"
~"Reading symbols from c:\\Users\\Alexander\\Downloads\\struct-test.eclipse-debugger\\StructTest\\Debug\\StructTest.exe..."
~"done.\n"
(gdb)
b main.c:19
&"b main.c:19\n"
~"Breakpoint 1 at 0x4016de: file ..\\main.c, line 19.\n"
=breakpoint-created,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x004016de",func="main",file="..\\\\main.c",fullname="C:\\\\Users\\\\Alexander\\\\Downloads\\\\struct-test.eclipse-debugger\\\\StructTest\\\\main.c",line="19",thread-groups=["i1"],times="0",original-location="main.c:19"}
^done
(gdb)
run
&"run\n"
~"Starting program: c:/Users/Alexander/Downloads/struct-test.eclipse-debugger/StructTest/Debug/StructTest.exe \n"
=thread-group-started,id="i1",pid="7068"
=thread-created,id="1",group-id="i1"
~"[New Thread 7068.0x4d0]\n"
^running
*running,thread-id="all"
(gdb)
=library-loaded,id="C:\\Windows\\SysWOW64\\kernel32.dll",target-name="C:\\Windows\\SysWOW64\\kernel32.dll",host-name="C:\\Windows\\SysWOW64\\kernel32.dll",symbols-loaded="0",thread-group="i1"
=library-loaded,id="C:\\Windows\\SysWOW64\\KernelBase.dll",target-name="C:\\Windows\\SysWOW64\\KernelBase.dll",host-name="C:\\Windows\\SysWOW64\\KernelBase.dll",symbols-loaded="0",thread-group="i1"
=library-loaded,id="C:\\Windows\\SysWOW64\\msvcrt.dll",target-name="C:\\Windows\\SysWOW64\\msvcrt.dll",host-name="C:\\Windows\\SysWOW64\\msvcrt.dll",symbols-loaded="0",thread-group="i1"
=breakpoint-modified,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x004016de",func="main",file="..\\\\main.c",fullname="C:\\\\Users\\\\Alexander\\\\Downloads\\\\struct-test.eclipse-debugger\\\\StructTest\\\\main.c",line="19",thread-groups=["i1"],times="1",original-location="main.c:19"}
~"\nBreakpoint "
~"1, main () at ..\\main.c:19\n"
~"19\t\treturn 0;\n"
*stopped,reason="breakpoint-hit",disp="keep",bkptno="1",frame={addr="0x004016de",func="main",args=[],file="..\\main.c",fullname="C:\\Users\\Alexander\\Downloads\\struct-test.eclipse-debugger\\StructTest\\main.c",line="19"},thread-id="1",stopped-threads="all"
(gdb)
-data-evaluate-expression (mydat).s2.i2
^done,value="2"
(gdb)
-data-evaluate-expression (mydat).i2
^error,msg="There is no member named i2."