[Bug c/28141] thread-local ptr initialized to address of thread-local misclassified as non-constant initializer

[Bug c/28141] thread-local ptr initialized to address of thread-local misclassified as non-constant initializer

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28141

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a won't fix as the C11's thread_local does not allow for it either.
C++'s thread_local does but that is because it allows dynamically
initialization; just like global variables in C++.

[Bug c/28141] thread-local ptr initialized to address of thread-local misclassified as non-constant initializer

[gary at intrepid dot com]

------- Comment #2 from gary at intrepid dot com  2006-06-23 16:44 -------
I agree this is definitely an enhancement, but will note the following:

1. On Fedora Core 5, x86_64, I was able to successfully link and run
a null program (written in assembly) that initializes thread local
'ptr' that points to thread local 'data'.  The declarations appear
as follows:
.globl data
        .section        .tbss,"awT",@nobits
        .align 8
        .type   data, @object
        .size   data, 8
data:
        .zero   8
.globl ptr
        .align 8
        .type   ptr, @object
        .size   ptr, 8
ptr:
        .quad   data
I didn't run extensive tests to verify this was doing the right thing, but
there were no complaints from the linker.

2. Given that __thread is an extension, we could choose to interpret
"constancy", as "constant from the perspective of the currently executing
thread" without doing much harm to "C" semantics.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28141

[Bug c/28141] thread-local ptr initialized to address of thread-local misclassified as non-constant initializer

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-06-23 06:55 -------
I think this needs also a binutils change and technically it is not a constant
as it does change between threads.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28141