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if (trim_distance >= seg.length / 2.0) {
    trim_distance = (seg.length / 2.0)-1e-3;
}   

int optimizer::trimCurves(vector& ptr_vector) {

// Trim all the curves back given the G64 P.. value.
for (std::size_t i = 0; i < ptr_vector.vec.size(); ++i) {

int trim_front=0;
int trim_back=0;

if(i>0){
trim_front=1;
}

if(i<ptr_vector.vec.size()-1){
trim_back=1;
}

// If next segment is colear, dont trim this end. Must be a line-line.
if(i<ptr_vector.vec.size()-1){
const struct emcmot_segment &seg = ptr_vector.vec.at(i);
const struct emcmot_segment &seg_next = ptr_vector.vec.at(i+1);

int res=isColinear(seg.start.tran, seg.end.tran, seg_next.end.tran);
if(seg.canon_motion_type!=3 && seg_next.canon_motion_type!=3 && res==1){
trim_back=0;
}
}

// If previous segment is colear, dont trim this start. Must be a line-line.
if(i>0){
const struct emcmot_segment &seg = ptr_vector.vec.at(i);
const struct emcmot_segment &seg_prev = ptr_vector.vec.at(i-1);

int res=isColinear(seg.start.tran, seg.end.tran, seg_prev.start.tran);
if(seg.canon_motion_type!=3 && seg_prev.canon_motion_type!=3 && res==1){
trim_front=0;
}
}

if (0 != trimCurve(ptr_vector.vec.at(i),trim_front,trim_back)) {
std::cerr << "Failed to trim curve at index " << i << std::endl;
return -1;
}
}
std::cout<<"trim curves done."<<std::endl;
return 0;
}

Is there a particular reason for not handling one fillet after the other?
In my mind it would be beneficial if the trimming process could actually influence how the filleting was done for a particular intersection which seems difficult in the current code.

QString strOne = QString::fromLocal8Bit(name);
    qDebug() << Q_FUNC_INFO << "Received name =  " << strOne << "  ;";
    //rtapi_print_msg(RTAPI_MSG_DBG, "setting signal '%s'\n", name);
    /* get mutex before accessing shared data */
    rtapi_mutex_get(&(hal_data->mutex));
    qDebug() << Q_FUNC_INFO << "hal_data_mutex name =  " << strOne << "  ;";
    /* search signal list for name */
    sig = halpr_find_sig_by_name(name);
    qDebug() << Q_FUNC_INFO << "halpr_find_sig_by_name name =  " << strOne << " sig value = " << sig << "  ;";

Issuing EMC_TRAJ_SET_G92 --      (  +227,+424,    +0,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,)
Issuing EMC_TRAJ_SET_ROTATION --      (  +226,+360,    +0,0.000000,)
void MainWindow::toggleBnt_hal(bool) name Toggle received  : "hal_cmd_3"
int do_sets_cmd(char*, char*) Received name =   "hal_cmd_3"   ;[color=#e74c3c] /* these is the last mark before rtapi call */[/color]
/usr/bin/linuxcnc: line 955: 135813 Segmentation fault      (core dumped) $EMCDISPLAY -ini "$INIFILE" $EMCDISPLAYARGS $EXTRA_ARGS
Shutting down and cleaning up LinuxCNC...
task: 0 cycles, min=0.000002, max=0.012565, avg=-1.000000, 0 latency excursions (> 10x expected cycle time of 0.010000s)
Note: Using POSIX realtime

int optimizer::trimCurve(emcmot_segment& seg, int& trim_front, int& trim_back) {
    double trim_distance = G64P; /*seg.tag.fields_float[3];*/  // G64 P..

    // Trim conditions.
    if(trim_distance<=0){
        std::cout<<"no trim distance for segment id:"<<seg.id<<std::endl;
        return 0;
    }

    if (trim_distance >= seg.length / 2.0) {
        trim_distance = (seg.length / 2.0)-1e-3;
    }

    if(trim_distance<=1e-6){
        std::cout<<"too short to trim, no trim is done for segment id:"<<seg.id<<std::endl;
        return 0;
    }

    if(seg.canon_motion_type==1 || seg.canon_motion_type==2){
        trimLine(seg,trim_distance,trim_front,trim_back,false);
    }
    if(seg.canon_motion_type==3){
        trimCircle(seg,trim_distance,trim_front,trim_back,false);
    }

    return 0;
}