src: Add constexpr to long_options

src/deflatehd.cc

@@ -373,7 +373,7 @@ OPTIONS:
             << std::endl;
 }
 
-static struct option long_options[] = {
+constexpr static struct option long_options[] = {
     {"http1text", no_argument, nullptr, 't'},
     {"table-size", required_argument, nullptr, 's'},
     {"deflate-table-size", required_argument, nullptr, 'S'},

src/h2load.cc

@@ -1839,7 +1839,7 @@ int main(int argc, char **argv) {
   bool nreqs_set_manually = false;
   while (1) {
     static int flag = 0;
-    static option long_options[] = {
+    constexpr static option long_options[] = {
         {"requests", required_argument, nullptr, 'n'},
         {"clients", required_argument, nullptr, 'c'},
         {"data", required_argument, nullptr, 'd'},

src/inflatehd.cc

@@ -251,7 +251,7 @@ OPTIONS:
   ;
 }
 
-static struct option long_options[] = {
+constexpr static struct option long_options[] = {
     {"dump-header-table", no_argument, nullptr, 'd'}, {nullptr, 0, nullptr, 0}};
 
 int main(int argc, char **argv) {

src/nghttp.cc

@@ -2680,7 +2680,7 @@ int main(int argc, char **argv) {
   bool color = false;
   while (1) {
     static int flag = 0;
-    static option long_options[] = {
+    constexpr static option long_options[] = {
         {"verbose", no_argument, nullptr, 'v'},
         {"null-out", no_argument, nullptr, 'n'},
         {"remote-name", no_argument, nullptr, 'O'},

src/nghttpd.cc

@@ -202,7 +202,7 @@ int main(int argc, char **argv) {
 
   while (1) {
     static int flag = 0;
-    static option long_options[] = {
+    constexpr static option long_options[] = {
         {"address", required_argument, nullptr, 'a'},
         {"daemon", no_argument, nullptr, 'D'},
         {"htdocs", required_argument, nullptr, 'd'},