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Subject: [Bug c/53037] warn_if_not_aligned(X)
Date: Thu, 19 Apr 2012 20:16:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D53037

--- Comment #12 from H.J. Lu <hjl.tools at gmail dot com> 2012-04-19 20:15:=
55 UTC ---
Created attachment 27197
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=3D27197
A patch

I got

[hjl@gnu-6 pr53037]$ cat x.i
typedef unsigned long long __u64
__attribute__((aligned(4),warn_if_not_aligned(8)));

struct foo1
{
  int i1;
  int i2;
  int i3;
  __u64 x;
};

struct foo2
{
  int i1;
  int i2;
  int i3;
  __u64 x;
} __attribute__((aligned(8)));

struct foo3
{
  int i1;
  int i2;
  __u64 x;
} __attribute__((aligned(8)));

struct foo4
{
  int i1;
  int i3;
  __u64 x;
};

union bar1
{
  int i1;
  int i3;
  __u64 x;
};

union bar2
{
  int i1;
  int i3;
  __u64 x;
} __attribute__((aligned(8)));
[hjl@gnu-6 pr53037]$ make x.s
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -mx32 -Wall -S x.i
x.i:10:1: warning: alignment 32 of =E2=80=98struct foo1=E2=80=99 is less th=
an 64 [enabled by
default]
 };
 ^
x.i:10:1: warning: =E2=80=98x=E2=80=99 offset 12 in =E2=80=98struct foo1=E2=
=80=99 isn't aligned to 8 [enabled
by default]
 };
 ^
x.i:18:1: warning: =E2=80=98x=E2=80=99 offset 12 in =E2=80=98struct foo2=E2=
=80=99 isn't aligned to 8 [enabled
by default]
 } __attribute__((aligned(8)));
 ^
x.i:32:1: warning: alignment 32 of =E2=80=98struct foo4=E2=80=99 is less th=
an 64 [enabled by
default]
 };
 ^
x.i:39:1: warning: alignment 32 of =E2=80=98union bar1=E2=80=99 is less tha=
n 64 [enabled by
default]
 };
 ^
[hjl@gnu-6 pr53037]$