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dnl Check whether the gcc accepts -isystem
dnl
AC_DEFUN([RTEMS_GCC_ISYSTEM],
[AC_REQUIRE([RTEMS_PROG_CC])
AC_CACHE_CHECK(whether $CC accepts -isystem,rtems_cv_gcc_isystem,
[
rtems_cv_gcc_isystem=no
if test x"$GCC" = x"yes"; then
cat << EOF > conftest.h
int conftest123();
EOF
cat << EOF > conftest.c
#include <conftest.h>
int conftest123() {}
EOF
if test -z "`${CC} -isystem./ -c conftest.c 2>&1`";then
rtems_cv_gcc_isystem=yes
fi
fi
rm -f conftest*
])])
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