This does not seem to be a "Debug" build.

Setting breakpoints by file name and line number may fail.

Section .debug_info: Not found.

Section .debug_abbrev: Not found.

Section .debug_line: Not found.

Section .debug_str: Not found.

Section .debug_loc: Not found.

Section .debug_range: Not found.

Section .gdb_index: Not found.

Section .note.gnu.build-id: Not found.

Section .gnu.hash: Not found.

Section .gnu_debuglink: Not found.

add this in your .pro

CONFIG += debug

from :

http://stackoverflow.com/questions/21870849/debugging-in-qt-creator-this-does-not-seem-to-be-a-debug-build