[Bug tree-optimization/79800] [7 Regression] wrong snprintf result range with precision in a narrow negative-positive range

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79800

--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Mar 15 04:31:27 2017
New Revision: 246151

URL: https://gcc.gnu.org/viewcvs?rev=246151&root=gcc&view=rev
Log:
        PR tree-optimization/79800
        * gimple-ssa-sprintf.c (format_floating: Add argument.  Handle
        precision in negative-positive range.
        (format_floating): Call non-const overload with adjusted precision.

        PR tree-optimization/79800
        * gcc.dg/tree-ssa/builtin-sprintf-warn-15.c: Add test cases.
        * gcc.dg/tree-ssa/pr79800.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr79800.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-sprintf.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-15.c