PEP 571: Update permitted GCC_4.5.0 (#1180)

Matching the symbols permitted for x86_64 by GCC_4.3.0 require a limit of GCC_4.5.0 on i686 CentOS 6.

This does create the risk that 32-bit extension modules using `__extendxftf2` may not actually be portable to all 2010 era systems, but most of those other than RHEL/CentOS 6 have already hit the end of their respective support periods.

Author: veblush

pep-0571.rst

@@ -155,7 +155,7 @@ the ``manylinux2010`` tag:
        GLIBC_2.12
        CXXABI_1.3.3
        GLIBCXX_3.4.13
-       GCC_4.3.0
+       GCC_4.5.0
 
    As an example, ``manylinux2010`` wheels may include binary artifacts
    that require ``glibc`` symbols at version ``GLIBC_2.4``, because
@@ -313,6 +313,16 @@ to be uploaded in the same way that it permits ``manylinux1``.  It
 should not attempt to verify the compatibility of ``manylinux2010``
 wheels.
 
+Summary of changes to \PEP 571
+==============================
+
+The following changes were made to this PEP based on feedback received after
+it was approved:
+
+* The maximum version symbol of ``libgcc_s`` was updated from ``GCC_4.3.0``
+  to ``GCC_4.5.0`` to address 32-bit Cent OS 6. This doesn't affect x86_64
+  because ``libgcc_s`` for x86_64 has no additional symbol from
+  ``GCC_4.3.0`` to ``GCC_4.5.0``.
 
 References
 ==========