[Bug c++/92659] New: Suggestions for bitshift

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92659

            Bug ID: 92659
           Summary: Suggestions for bitshift
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jg at jguk dot org
  Target Milestone: ---

Could GCC suggest for C/C++ the code change?


#include <stddef.h>
size_t i = 1 << 32;


#1 with x86-64 gcc (trunk)
<source>:2:14: warning: left shift count >= width of type
[-Wshift-count-overflow]
    2 | size_t i = 1 << 32;
      |            ~~^~~~~
Compiler returned: 0



It could output:
<source>:2:14: warning: left shift count >= width of type
[-Wshift-count-overflow]
    2 | size_t i = 1 << 32;
      |            ~~^~~~~
      | size_t i = 1 << 32;
      |          ~~^~~~~
      |            1UL << 32;