Em Tue, Oct 15, 2019 at 09:38:28PM -0700, Charles Machalow escreveu:
> Hello all,
>
> I've built Pahole 1.15 from source on WSL Ubuntu. Though I have is a
> very simple example of a C struct that doesn't seem to work correctly
> if compiled as C++ via g++, though works fine when compiled as C via
> gcc.
>
> Is Pahole intended to work with code compiled as C++ (as opposed to
> C)? If so, take a look at the simple test.c file (can be compiled via
It should work with C++ as well, albeit the support that is there was
mostly in response to reports from users, notably from the guys at
CERN's ATLAS project, long ago.
> gcc or g++). Also take a look at the output from running pahole
> against the created executable. via both g++/gcc builds It seems like
> the nested struct is duplicated if compiled on C++. Does this seem
> like a bug?
I'll check, thanks for the report.
- Arnaldo
> In both cases, GCC is version 7.4.0.
>
> test.c:
> #include <stdint.h>
>
> typedef struct _INNER {
> long myLong;
> } INNER;
>
> typedef struct _MY_STRUCT {
> struct
> {
> char a;
> int b;
> uint64_t ccc;
> uint8_t _8_1 : 1;
> uint8_t _8_4 : 4;
> uint8_t _8_3 : 3;
> INNER i;
> };
>
> } MY_STRUCT;
>
> int main()
> {
> MY_STRUCT m;
> return 0;
> }
>
> pahole_g++:
> csm10495@csm10495-desk:~$ g++ -g test.c && pahole a.out -q
> struct _INNER {
> long int myLong;
> };
> struct _MY_STRUCT {
> struct {
> char a;
> int b;
> uint64_t ccc;
> uint8_t _8_1:1;
> uint8_t _8_4:4;
> uint8_t _8_3:3;
> INNER i;
> };
>
> struct {
> char a;
> int b;
> uint64_t ccc;
> uint8_t _8_1:1;
> uint8_t _8_4:4;
> uint8_t _8_3:3;
> INNER i;
> };
> };
>
> pahole_gcc:
> csm10495@csm10495-desk:~$ gcc -g test.c && pahole a.out -q
> struct _INNER {
> long int myLong;
> };
> struct _MY_STRUCT {
> struct {
> char a;
> int b;
> uint64_t ccc;
> uint8_t _8_1:1;
> uint8_t _8_4:4;
> uint8_t _8_3:3;
> INNER i;
> };
> };
>
>
> Thanks all.
>
> - Charlie Scott Machalow
--
- Arnaldo
