frame.c: In function ‘set_tab_bar_lines’:
frame.c:251: warning: value computed is not used
frame.c:253: warning: ISO C90 forbids mixed declarations and code
frame.c:235: warning: unused variable ‘dummy’
frame.c:235: warning: unused variable ‘tab’
frame.c: In function ‘set_current_tab’:
frame.c:314: warning: ISO C90 forbids mixed declarations and code
frame.c: In function ‘add_tab’:
frame.c:809: warning: ‘return’ with no value, in function returning non-void
frame.c:810: warning: ISO C90 forbids mixed declarations and code
frame.c: In function ‘Fframe_parameters’:
frame.c:2592: warning: unused variable ‘items’

xdisp.c: In function ‘display_tab_bar’:
xdisp.c:18213: warning: ISO C90 forbids mixed declarations and code
xdisp.c:18241: warning: ISO C90 forbids mixed declarations and code