[Bug c/48956] -Wconversion should warn when a complex value is assigned to a real result

[miyuki at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48956

--- Comment #12 from miyuki at gcc dot gnu.org ---
Author: miyuki
Date: Fri May 15 18:02:50 2015
New Revision: 223223

URL: https://gcc.gnu.org/viewcvs?rev=223223&root=gcc&view=rev
Log:
PR c/48956

gcc/c-family/
* c-common.c (int_safely_convertible_to_real_p): Define.
(unsafe_conversion_p): Check conversions involving complex types.
(conversion_warning): Add new warning message for conversions which
discard imaginary component.
* c-common.h: (enum conversion_safety): Add new enumerator for such
conversions.

gcc/testsuite/
* gcc.dg/Wconversion-complex-c99.c: New test.
* gcc.dg/Wconversion-complex-gnu.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/Wconversion-complex-c99.c
    trunk/gcc/testsuite/gcc.dg/Wconversion-complex-gnu.c
Modified:
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/c-family/c-common.h
    trunk/gcc/testsuite/ChangeLog