Function make1a

v2/engine/make1.c:293–364

 */

static void make1a( state * const pState )
{
    TARGET * t = pState->t;
    TARGET * const scc_root = target_scc( t );

    if ( !pState->parent || target_scc( pState->parent ) != scc_root )
        pState->t = t = scc_root;

    /* If the parent is the first to try to build this target or this target is
     * in the MAKE1C quagmire, arrange for the parent to be notified when this
     * target has been built.
     */
    if ( pState->parent && t->progress <= T_MAKE_RUNNING )
    {
        TARGET * const parent_scc = target_scc( pState->parent );
        if ( t != parent_scc )
        {
            t->parents = targetentry( t->parents, parent_scc );
            ++parent_scc->asynccnt;
        }
    }

    /* If the target has been previously updated with -n in effect, and we are
     * now ignoring -n, update it for real. E.g. if the UPDATE_NOW rule was
     * called for it twice - first with the -n option and then without.
     */
    if ( !globs.noexec && t->progress == T_MAKE_NOEXEC_DONE )
        t->progress = T_MAKE_INIT;

    /* If this target is already being processed then do nothing. There is no
     * need to start processing the same target all over again.
     */
    if ( t->progress != T_MAKE_INIT )
    {
        pop_state( &state_stack );
        return;
    }

    /* Guard against circular dependencies. */
    t->progress = T_MAKE_ONSTACK;

    /* 'asynccnt' counts the dependencies preventing this target from proceeding
     * to MAKE1C for actual building. We start off with a count of 1 to prevent
     * anything from happening until we can notify all dependencies that they
     * are needed. This 1 is then accounted for when we enter MAKE1B ourselves,
     * below. Without this if a dependency gets built before we finish
     * processing all of our other dependencies our build might be triggerred
     * prematurely.
     */
    t->asynccnt = 1;

    /* Push dependency build requests (to be executed in the natural order). */
    {
        stack temp_stack = { NULL };
        TARGETS * c;
        for ( c = t->depends; c && !quit; c = c->next )
            push_state( &temp_stack, c->target, t, T_STATE_MAKE1A );
        push_stack_on_stack( &state_stack, &temp_stack );