[Bug target/63810] gcc sets incorrect macro for OS X deployment targets

["larryv at macports dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63810

--- Comment #4 from Lawrence Velázquez <larryv at macports dot org> ---
Created attachment 33969
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33969&action=edit
patch against 4.9 branch for handling deployment targets correctly

Patched GCC 4.9.2 matched the behavior of Apple LLVM Compiler 6.0
(clang-600.0.54) over 8,451 out of 8,464 test strings. The 13 mismatches are
due to a bug in clang.
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From: "larryv at macports dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/63810] gcc sets incorrect macro for OS X deployment targets
Date: Fri, 14 Nov 2014 09:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63810

--- Comment #5 from Lawrence Velázquez <larryv at macports dot org> ---
Created attachment 33970
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33970&action=edit
patch against 4.8 branch for handling deployment targets correctly

This patch incorporates and supersedes attachment 33932 from bug 61407.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/63862] New: C frontend converts shift-count to int while standard wants integer promotions
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc862

            Bug ID: 63862
           Summary: C frontend converts shift-count to int while standard
                    wants integer promotions
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
                CC: jsm28 at gcc dot gnu.org

/* Convert the non vector shift-count to an integer, regardless
             of size of value being shifted.  */
          if (TREE_CODE (TREE_TYPE (op1)) != VECTOR_TYPE
              && TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
            op1 = convert (integer_type_node, op1);

while C99 6.5.7 says "The integer promotions are performed on each of the
operands".

The above pessimizes gcc.c-torture/execute/shiftopt-1.c which does

void
utest (unsigned int x)
{
  if (-1 >> x != -1)
    link_error ();
}

and thus expects us to know that the shift amount is nonnegative.  But
with the C frontend generating -1 >> (int)x we don't know that anymore
(and thus if I fix the bogus fold-const.c code which strips sign-changing
conversions on x before asking tree_expr_nonnegative_p it fails to optimize).