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# DP: Make LTO link pick up compile-time -g
https://gcc.gnu.org/ml/gcc-patches/2019-09/msg00501.html
2019-09-09 Richard Biener <rguenther@suse.de>
* lto-opts.c (lto_write_options): Stream -g when debug is enabled.
* lto-wrapper.c (merge_and_complain): Pick up -g.
(append_compiler_options): Likewise.
(run_gcc): Re-instantiate handling -g0 at link-time.
* doc/invoke.texi (flto): Document debug info generation.
--- a/src/gcc/lto-opts.c
+++ b/src/gcc/lto-opts.c
@@ -94,6 +94,10 @@ lto_write_options (void)
: "-fno-pie");
}
+ /* If debug info is enabled append -g. */
+ if (debug_info_level > DINFO_LEVEL_NONE)
+ append_to_collect_gcc_options (&temporary_obstack, &first_p, "-g");
+
/* Append options from target hook and store them to offload_lto section. */
if (lto_stream_offload_p)
{
--- a/src/gcc/lto-wrapper.c
+++ b/src/gcc/lto-wrapper.c
@@ -265,6 +265,7 @@ merge_and_complain (struct cl_decoded_op
case OPT_fshow_column:
case OPT_fcommon:
case OPT_fgnu_tm:
+ case OPT_g:
/* Do what the old LTO code did - collect exactly one option
setting per OPT code, we pick the first we encounter.
??? This doesn't make too much sense, but when it doesn't
@@ -617,6 +618,7 @@ append_compiler_options (obstack *argv_o
case OPT_fopenacc:
case OPT_fopenacc_dim_:
case OPT_foffload_abi_:
+ case OPT_g:
case OPT_O:
case OPT_Ofast:
case OPT_Og:
@@ -1399,6 +1401,10 @@ run_gcc (unsigned argc, char *argv[])
linker_output_rel = !strcmp (option->arg, "rel");
break;
+ case OPT_g:
+ /* Recognize -g0. */
+ skip_debug = option->arg && !strcmp (option->arg, "0");
+ break;
default:
break;
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