Hello
Gcc 3.4.2 on WinXP seems to generate a warning that it should not.
$ gcc -v
Reading specs from C:/msys/mingw/bin/../lib/gcc/mingw32/3.4.2/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as
--host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads
--disable-nls --enable-languages=c,c++,f77,ada,objc,java
--disable-win32-registry --disable-shared --enable-sjlj-exceptions
--enable-libgcj --disable-java-awt --without-x --enable-java-gc=boehm
--disable-libgcj-debug --enable-interpreter
--enable-hash-synchronization --enable-libstdcxx-debug
Thread model: win32
gcc version 3.4.2 (mingw-special)
The following C code shows the problem.
int foo() {
long long val1 = 1; /* No warn when val1 is a long long */
int c1 = (
((long long) val1) <
((long long)(-2147483647L - 1))
);
long val2 = 1; /* incorrect warn when val2 is a long */
int c2 = (
((long long) val2) <
((long long)(-2147483647L - 1))
);
return (c1 || c2);
}
$ gcc -c test.c
test.c: In function `foo':
test.c:11: warning: comparison is always false due to limited range of
data type
Both of the tests in the code above should compile without a warning,
but the second one does not.
thanks much
Mo DeJong
