[Bug c/88546] Copy attribute unusable for weakrefs

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88546

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Sat Jan  5 00:57:30 2019
New Revision: 267591

URL: https://gcc.gnu.org/viewcvs?rev=267591&root=gcc&view=rev
Log:
PR c/88546 - Copy attribute unusable for weakrefs

gcc/c-family/ChangeLog:

        PR c/88546
        * c-attribs.c (handle_copy_attribute): Avoid copying attribute leaf.
        Handle C++ empty throw specification and C11 _Noreturn.
        (has_attribute): Also handle C11 _Noreturn.

gcc/ChangeLog:

        PR c/88546
        * attribs.c (decls_mismatched_attributes): Avoid warning for attribute
        leaf.

gcc/testsuite/ChangeLog:

        PR c/88546
        * g++.dg/ext/attr-copy.C: New test.
        * gcc.dg/attr-copy-4.c: Disable macro expansion tracking.
        * gcc.dg/attr-copy-6.c: New test.
        * gcc.dg/attr-copy-7.c: New test.


Added:
    trunk/gcc/testsuite/g++.dg/ext/attr-copy.C
    trunk/gcc/testsuite/gcc.dg/attr-copy-6.c
    trunk/gcc/testsuite/gcc.dg/attr-copy-7.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/attribs.c
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-attribs.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/attr-copy-4.c
    trunk/libgcc/gthr-posix.h
    trunk/libgfortran/libgfortran.h