[Bug c++/53829] New: Trivial static initializers are created for initialization with result of trivial static inline functions

[mh+gcc at glandium dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53829

             Bug #: 53829
           Summary: Trivial static initializers are created for
                    initialization with result of trivial static inline
                    functions
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: mh+...@glandium.org


The most trivial example of the behaviour is this:

#include <stdint.h>
static inline uint64_t foo() { return 42; }
uint64_t f = foo();

G++ generates the following:
    .file    "test.cc"
    .section    .text.startup,"ax",@progbits
    .p2align 4,,15
    .type    _GLOBAL__sub_I_f, @function
_GLOBAL__sub_I_f:
.LFB2:
    .cfi_startproc
    movq    $42, f(%rip)
    ret
    .cfi_endproc
.LFE2:
    .size    _GLOBAL__sub_I_f, .-_GLOBAL__sub_I_f
    .section    .init_array,"aw"
    .align 8
    .quad    _GLOBAL__sub_I_f
    .globl    f
    .bss
    .align 8
    .type    f, @object
    .size    f, 8
f:
    .zero    8
    .ident    "GCC: (Debian 4.7.1-2) 4.7.1"
    .section    .note.GNU-stack,"",@progbits

For reference, clang++ generates the following:

    .file    "test.cc"
    .type    f,@object               # @f
    .data
    .globl    f
    .align    8
f:
    .quad    42                      # 0x2a
    .size    f, 8


    .section    ".note.GNU-stack","",@progbits

There are cases where g++ is able to generate code like clang++, but I can't
find one just now.