https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97937
Bug ID: 97937
Summary: Line numbers are missing from duplicated function
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Consider this test case:
$ cat test.c
int test(void)
{
return 0;
}
int test1(void)
{
return 0;
}
struct s {
int (*x) (void);
int (*y) (void);
};
struct s xxx = { test, test1 };
$ gcc -g -O2 -S test.c
test.s:
.file "test.c"
.text
.Ltext0:
.p2align 4
.globl test
.type test, @function
test:
.LFB0:
.file 1 "test.c"
.loc 1 2 1 view -0
.cfi_startproc
.loc 1 3 3 view .LVU1
.loc 1 4 1 is_stmt 0 view .LVU2
xorl %eax, %eax
ret
.cfi_endproc
.LFE0:
.size test, .-test
.p2align 4
.globl test1
.type test1, @function
test1:
.LFB3:
.cfi_startproc
xorl %eax, %eax
ret
.cfi_endproc
The problem is that there are no line numbers in test1.
That is caused by this statement in symtab-thunks.cc
428 if (force_gimple_thunk)
429 DECL_IGNORED_P (thunk_fndecl) = 1;
#0 expand_thunk (node=0x7fffeee7edd0, output_asm_thunks=false,
force_gimple_thunk=true)
at ../../gcc-trunk/gcc/symtab-thunks.cc:429
#1 0x0000000000fca17b in cgraph_node::create_wrapper (this=0x7fffeee7edd0,
target=0x7fffeee7ebb0)
at ../../gcc-trunk/gcc/cgraphunit.c:2601
#2 0x000000000281d7bd in ipa_icf::sem_function::merge (this=0x46dfc90,
alias_item=0x46c2880)
at ../../gcc-trunk/gcc/ipa-icf.c:1299
#3 0x0000000002825672 in ipa_icf::sem_item_optimizer::merge_classes
(this=0x4746390, prev_class_count=902,
loaded_symbols=74) at ../../gcc-trunk/gcc/ipa-icf.c:3406
#4 0x00000000028220c8 in ipa_icf::sem_item_optimizer::execute (this=0x4746390)
at ../../gcc-trunk/gcc/ipa-icf.c:2459
together with this in final.c:
2433 case NOTE_INSN_BEGIN_STMT:
2434 gcc_checking_assert (cfun->debug_nonbind_markers);
2435 if (!DECL_IGNORED_P (current_function_decl)
2436 && notice_source_line (insn, NULL))
(gdb)
2437 {
2438 output_source_line:
2439 (*debug_hooks->source_line) (last_linenum,
last_columnnum,
2440 last_filename,
last_discriminator,
2441 true);
2442 clear_next_view_needed (seen);
2443 }
2444 break;
which prevents the line number from being included in the asm.
