2013/8/22 Hendrik Greving <hendrik.greving.intel@xxxxxxxxx>: > Does anybody know by any chance why, for x86, I am always getting LFB, > LFE labels (function begin, function end), even when compiled without > '-g'? I looked and only dwarf2out seems to write this. Why are there > dwarf in every x86 .s file? > Because there is a common target hook defined in gcc/common/config/i386/i386-common.c: #define TARGET_EXCEPT_UNWIND_INFO i386_except_unwind_info where i386_except_unwind_info returns UI_DWARF2 in i386 port. (DWARF2_UNWIND_INFO defaults to 1 in this case, see gcc/defaults.h) Then how does UI_DWARF2 cause the situation you observed? You can try to set breakpoints on: dwarf2out_do_cfi_asm() i386_except_unwind_info() dwarf2out_begin_prologue() dwarf2out_do_frame() to see how it effects the flow in dwarf2out_begin_prologue(). Best regards, jasonwucj
