https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114337
Bug ID: 114337
Summary: LTO symbol table doesn't include builtin functions
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-cfl-3 pr31482-a]$ cat y.c
#include <stdio.h>
#include <stdlib.h>
void *
foo (size_t n)
{
printf ("hello\n");
return malloc (n);
}
[hjl@gnu-cfl-3 pr31482-a]$ gcc -flto -c y.c
[hjl@gnu-cfl-3 pr31482-a]$ nm y.o
00000000 T foo
[hjl@gnu-cfl-3 pr31482-a]$ lto-dump -list y.o
Type Visibility Size Name
function default 0 puts
function default 0 malloc
function default 4 foo
[hjl@gnu-cfl-3 pr31482-a]$
This doesn't work with libraries which provide alternative implementations
for standard functions, like jemalloc, since linker doesn't know the builtin
functions are referenced. Unless GCC can inline these builtin functions,
these symbols should be in LTO symbol table.
