This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
Re: Is section order preserved in C?
On 06/16/2010 03:03 AM, David VomLehn wrote:
> This is probably an obscure question, but is the order that C puts things
> in sections with the __attribute((section("secA"))) always the same as
> the order in which they appear in the source file. For example:
>
> void f(void)
> {
> static int a1 __attribute__((section("A")));
> static int b1 __attribute__((section("B")));
> }
> void g(void)
> {
> static int a2 __attribute__((section("A")));
> static int b2 __attribute__((section("B")));
> }
>
> So, can I count on the storage for a1 being followed by storage for a2 in
> section A and the storage for b1 being followed by storage for b2?
>
> It makes my life a bit easier if this is true, but I'm rather sure the C
> standard doesn't guarantee it, and wouldn't be surprised if it weren't
> true. I only care about ordering within sections, not the order in which
> sections appear.
No. Section ordering is controlled by the linker. If you need some
specific order you can write a link script to do it, but all this is
way outside the subject of gcc.
Andrew.