https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96383
--- Comment #25 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:c6ef9d8d3f11221df1ea6358b8d4e79e42f074fb commit r11-2455-gc6ef9d8d3f11221df1ea6358b8d4e79e42f074fb Author: Richard Biener <rguent...@suse.de> Date: Thu Jul 30 11:46:43 2020 +0200 debug/96383 - emit debug info for used external functions This makes sure to emit full declaration DIEs including formal parameters for used external functions. This helps debugging when debug information of the external entity is not available and also helps external tools cross-checking ABI compatibility which was the bug reporters use case. For cc1 this affects debug information size as follows: VM SIZE FILE SIZE ++++++++++++++ GROWING ++++++++++++++ [ = ] 0 .debug_info +1.63Mi +1.3% [ = ] 0 .debug_str +263Ki +3.4% [ = ] 0 .debug_abbrev +101Ki +4.9% [ = ] 0 .debug_line +5.71Ki +0.0% +44% +16 [Unmapped] +48 +1.2% -------------- SHRINKING -------------- [ = ] 0 .debug_loc -213 -0.0% -0.0% -48 .text -48 -0.0% [ = ] 0 .debug_ranges -16 -0.0% -0.0% -32 TOTAL +1.99Mi +0.6% and DWARF compression via DWZ can only shave off minor bits here. Previously we emitted no DIEs for external functions at all unless they were referenced via DW_TAG_GNU_call_site which for some GCC revs caused a regular DIE to appear and since GCC 4.9 only a stub without formal parameters. This means at -O0 we did not emit any DIE for external functions but with optimization we emitted stubs. 2020-07-30 Richard Biener <rguent...@suse.de> PR debug/96383 * langhooks-def.h (lhd_finalize_early_debug): Declare. (LANG_HOOKS_FINALIZE_EARLY_DEBUG): Define. (LANG_HOOKS_INITIALIZER): Amend. * langhooks.c: Include cgraph.h and debug.h. (lhd_finalize_early_debug): Default implementation from former code in finalize_compilation_unit. * langhooks.h (lang_hooks::finalize_early_debug): Add. * cgraphunit.c (symbol_table::finalize_compilation_unit): Call the finalize_early_debug langhook. gcc/c-family/ * c-common.h (c_common_finalize_early_debug): Declare. * c-common.c: Include debug.h. (c_common_finalize_early_debug): finalize_early_debug langhook implementation generating debug for extern declarations. gcc/c/ * c-objc-common.h (LANG_HOOKS_FINALIZE_EARLY_DEBUG): Define to c_common_finalize_early_debug. gcc/cp/ * cp-objcp-common.h (LANG_HOOKS_FINALIZE_EARLY_DEBUG): Define to c_common_finalize_early_debug. gcc/testsuite/ * gcc.dg/debug/dwarf2/pr96383-1.c: New testcase. * gcc.dg/debug/dwarf2/pr96383-2.c: Likewise. libstdc++-v3/ * testsuite/20_util/assume_aligned/3.cc: Use -g0.
