https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65865
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
[hjl@gnu-6 gcc]$ cat /tmp/x.cc
extern unsigned long indirect_call_wrapper;
typedef unsigned long size_t;
template <typename F>
F IndirectExternCall(F f) {
typedef F (*WrapF)(F);
return indirect_call_wrapper ? ((WrapF)indirect_call_wrapper)(f) : f;
}
typedef void (*get_tls_func)(size_t*, size_t*) __attribute__((regparm(3),
stdcall));
void
foo (void *get_tls_static_info_ptr)
{
get_tls_func get_tls;
__builtin_memcpy (&get_tls, &get_tls_static_info_ptr,
sizeof(get_tls_static_info_ptr));
size_t tls_size = 0;
size_t tls_align = 0;
IndirectExternCall (get_tls)(&tls_size, &tls_align);
}
[hjl@gnu-6 gcc]$ ./xgcc -B./ -S -m32 -O2 /tmp/x.cc
/tmp/x.cc: In function ‘void foo(void*)’:
/tmp/x.cc:21:30: error: invalid conversion from ‘get_tls_func {aka void
(__attribute__((stdcall, regparm(3))) *)(long unsigned int*, long unsigned
int*)}’ to ‘void (*)(long unsigned int*, long unsigned int*)’ [-fpermissive]
IndirectExternCall (get_tls)(&tls_size, &tls_align);
^
/tmp/x.cc:6:3: note: initializing argument 1 of ‘F IndirectExternCall(F)
[with F = void (*)(long unsigned int*, long unsigned int*)]’
F IndirectExternCall(F f) {
^
[hjl@gnu-6 gcc]$
