[Bug c/32102] New: -Wall stomps on -Wstrict-overflow

[mec at google dot com]

This is with the 4.3-20070525 snapshot.

Test program:

void Alpha();

void Beta() {
  int i;
  for (i = 1; i > 0; ++i)
    Alpha();
}

This invocation produces no warnings:

/home/mec/gcc-4.3-20070525/install/bin/gcc -O2 -S -Wstrict-overflow=2 -Wall
z1.c

This invocation produces warnings:

/home/mec/gcc-4.3-20070525/install/bin/gcc -O2 -S -Wall -Wstrict-overflow=2
z1.c
z1.c: In function 'Beta':
z1.c:5: warning: assuming signed overflow does not occur when simplifying
conditional to constant

It looks like -Wall sets the strict overflow warning level to 1, quietly
stomping on the earlier setting.


-- 
           Summary: -Wall stomps on -Wstrict-overflow
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mec at google dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32102