[LLVMbugs] [Bug 23211] New: clang doesn't warn when integer is tried against literal that is too big

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23211

            Bug ID: 23211
           Summary: clang doesn't warn when integer is tried against
                    literal that is too big
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nchambers at dtscode.io
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14195
  --> https://llvm.org/bugs/attachment.cgi?id=14195&action=edit
Testcase

Using the attached testcase, clang doesn't output any warnings when comparing
an unsigned int against a literal that is too big in size. Compile Flags:

dtscode at dtscode-laptop:~/Desktop$ clang unsigned-test.c -o unsigned-test -Wall
-Wextra -pedantic -Wtype-limits
dtscode at dtscode-laptop:~/Desktop$

using similar flags in gcc (with the addition of -std=c99 since I'm a few
releases behind):

dtscode at dtscode-laptop:~/Desktop$ gcc -std=c99 unsigned-test.c -o unsigned-test
-Wall -Wextra -pedantic
unsigned-test.c: In function ‘main’:
unsigned-test.c:5:3: warning: comparison is always true due to limited range of
data type [-Wtype-limits]
   for (unsigned int i=0; i<=4294967295; i++) sum++;
   ^
dtscode at dtscode-laptop:~/Desktop$

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