path: root/acinclude.m4

dnl Turn on the additional warnings last, so -Werror doesn't affect other tests.

AC_DEFUN([IDT_COMPILE_WARNINGS],[
   if test -f $srcdir/autogen.sh; then
    default_compile_warnings="error"
    else
    default_compile_warnings="no"
    fi

    AC_ARG_WITH(compile-warnings,
                AS_HELP_STRING([--with-compile-warnings=@<:@no/yes/error@:>@],
                               [Compiler warnings]),
                [enable_compile_warnings="$withval"],
                [enable_compile_warnings="$default_compile_warnings"])

    warnCFLAGS=
    if test "x$GCC" != xyes; then
    enable_compile_warnings=no
    fi

    warning_flags=
    realsave_CFLAGS="$CFLAGS"

    case "$enable_compile_warnings" in
    no)
    warning_flags=
    ;;
    yes)
    warning_flags="-Wall -Wunused -Wmissing-prototypes -Wmissing-declarations"
    ;;
    maximum|error)
    warning_flags="-Wall -Wunused -Wchar-subscripts -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wpointer-arith"
    CFLAGS="$warning_flags $CFLAGS"
    for option in -Wno-sign-compare -Wno-pointer-sign; do
        SAVE_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $option"
        AC_MSG_CHECKING([whether gcc understands $option])
        AC_TRY_COMPILE([], [],
            has_option=yes,
            has_option=no,)
        CFLAGS="$SAVE_CFLAGS"
        AC_MSG_RESULT($has_option)
        if test $has_option = yes; then
          warning_flags="$warning_flags $option"
        fi
        unset has_option
        unset SAVE_CFLAGS
    done
    unset option
    if test "$enable_compile_warnings" = "error" ; then
        warning_flags="$warning_flags -Werror"
    fi
    ;;
    *)
    AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --enable-compile-warnings)
    ;;
    esac
    CFLAGS="$realsave_CFLAGS"
    AC_MSG_CHECKING(what warning flags to pass to the C compiler)
    AC_MSG_RESULT($warning_flags)

    WARN_CFLAGS="$warning_flags"
    AC_SUBST(WARN_CFLAGS)
])