[Bug preprocessor/79210] [7 Regression] "internal compiler error: in get_substring_ranges_for_loc" processing -Wformat-signedness warning

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79210

--- Comment #13 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Tue Jan 31 20:22:43 2017
New Revision: 245070

URL: https://gcc.gnu.org/viewcvs?rev=245070&root=gcc&view=rev
Log:
Prevent ICEs due to bogus substring locations (PR preprocessor/79210)

gcc/ChangeLog:
        PR preprocessor/79210
        * input.c (get_substring_ranges_for_loc): Replace line_width
        assertion with error-handling.

gcc/testsuite/ChangeLog:
        PR preprocessor/79210
        * gcc.dg/format/pr79210.c: New test case.
        * gcc.dg/plugin/diagnostic-test-string-literals-2.c (test_pr79210):
        New function.


Added:
    trunk/gcc/testsuite/gcc.dg/format/pr79210.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/input.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/plugin/diagnostic-test-string-literals-2.c