Hello, My gcc 4.2.2 testsuite tests for AES NI (-maes) support fails when I run 'make -k check' UNSUPPORTED: gcc.target/i386/addr-sel-1.c UNSUPPORTED: gcc.target/i386/aesdec.c UNSUPPORTED: gcc.target/i386/aesdeclast.c UNSUPPORTED: gcc.target/i386/aesenc.c UNSUPPORTED: gcc.target/i386/aesenclast.c UNSUPPORTED: gcc.target/i386/aesimc.c UNSUPPORTED: gcc.target/i386/aeskeygenassist.c The processor is an Intel Core i5 670 which supports the AES NI instructions. I've verified this by checking that the bit CPUID.01H:ECX.AES (bit25) is set to 1. In case this is relevant, the Red Hat 5.4 kernel is 2.6.32.4. I also verified that gcc 4.4.3 tests fail with the same unsupported error. As a result, my code that calls these AES NI instructions fails at compile time. Any information on gcc 4.x support for AES NI will be appreciated. Thanks, sri