gcc warnings

["Humpolicek, Jiri - Acision" <jiri.humpolicek@acision.com>]

Hi,
            I have, from my point of view, strange problem. I want to tell gcc to report all compilation warnings, especially warnings about assigment from variable of greater type to variable with smaller type. For example, when I write following code and compile it with next command no warning is reported:

c++ -o test test.cpp -Wall -Wextra -Wconversion -pedantic

#include "stdio.h"

int main()
{
        long a = 10000;
        unsigned char b = a;

        printf("%d\n", b);

        return b;
}

Gcc -v prints these information, but I have already test it on different versions but with same unsatsfactory results:

Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.1.2/work/gcc-4.1.2/configure --prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/4.1.2 --includedir=/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/include --datadir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.2 --mandir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.2/man --infodir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.2/info --with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/include/g++-v4 --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec --enable-nls --without-included-gettext --with-system-zlib --disable-checking --disable-werror --enable-secureplt --disable-libunwind-exceptions --disable-multilib --enable-libmudflap --disable-libssp --enable-java-awt=gtk --enable-objc-gc --enable-languages=c,c++,java,objc,obj-c++,fortran --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
Thread model: posix
gcc version 4.1.2 (Gentoo 4.1.2)

Where is the problem?

Thanks for explanations and have a nice day, Jiri Humpolicek



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