[Bug c/60069] New: Different warning messages for -Wconversion with different optimization levels

[Bug c/60069] New: Different warning messages for -Wconversion with different optimization levels

[chengniansun at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60069

            Bug ID: 60069
           Summary: Different warning messages for -Wconversion with
                    different optimization levels
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com

For the following code, gcc with -O0 emits a conversion warning, and gcc with
-O1 emits an overflow warning. 

Does gcc have a similar policy to Clang that warnings should be not affected by
optimization levels? 


$: cat s.c
void fn1() {
  unsigned short *l_432;
  const long l_448 = 70758;
  *l_432 = +l_448;
}
$: gcc-trunk -O0 -c -Wconversion s.c
s.c: In function ‘fn1’:
s.c:4:12: warning: conversion to ‘short unsigned int’ from ‘long int’ may alter
its value [-Wconversion]
   *l_432 = +l_448;
            ^
$: gcc-trunk -O1 -c -Wconversion s.c
s.c: In function ‘fn1’:
s.c:4:12: warning: large integer implicitly truncated to unsigned type
[-Woverflow]
   *l_432 = +l_448;
            ^
$: gcc-trunk --version
gcc-trunk (GCC) 4.9.0 20140204 (experimental)
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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Subject: [Bug target/59777] Incorrect expansion of TLS arguments in a call
Date: Wed, 05 Feb 2014 00:44:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY777

--- Comment #2 from John David Anglin <danglin at gcc dot gnu.org> ---
Author: danglin
Date: Wed Feb  5 00:43:56 2014
New Revision: 207493

URL: http://gcc.gnu.org/viewcvs?rev 7493&root=gcc&view=rev
Log:
    PR target/59777
    * config/pa/pa.c (legitimize_tls_address): Return original address
    if not passed a SYMBOL_REF rtx.
    (hppa_legitimize_address): Call legitimize_tls_address for all TLS
    addresses.
    (pa_emit_move_sequence): Simplify TLS source operands.
    (pa_legitimate_constant_p): Reject all TLS constants.
    * config/pa/pa.h (PA_SYMBOL_REF_TLS_P): Correct comment.
    (CONSTANT_ADDRESS_P): Reject TLS CONST addresses.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/pa/pa.c
    trunk/gcc/config/pa/pa.h

[Bug c/60069] Different warning messages for -Wconversion with different optimization levels

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60069

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-04-14
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
At least for FE warnings, yes. Optimization level should not affect the gimple
passed to the middle-end, so it should not affect -Wconversion.
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Subject: [Bug c/60838] bugos warning: initializer element is not a constant expression: int test = (0 ? (1,0) : 0) + 1;
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id`838

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-04-14
     Ever confirmed|0                           |1