https://github.com/lazarus-pkgs/panini/pull/16
From: Brahmajit Das <brahmajit.xyz@gmail.com>
Date: Thu, 21 Sep 2023 09:12:45 +0000
Subject: [PATCH] Fix C++17 does not allow register storage class specifier

C++14 depricated register storage class and it was copletely removed
from C++17. Hence we get this build error with newer compilers like
Clang 16 and GCC 14. This patch should fix it.

Bug: https://bugs.gentoo.org/896226
Signed-off-by: Brahmajit Das <brahmajit.xyz@gmail.com>
--- a/src/GLwindow.cpp
+++ b/src/GLwindow.cpp
@@ -901,7 +901,7 @@ void GLwindow::setImgAlpha( QImage * pim, double alpha ){
     qint32 m = (int( 255 * alpha ) & 255 ) << 24;
 
     for( int i = pim->width() * pim->height(); i > 0; i-- ){
-        register qint32 t = *pw & 0x00ffffff;
+        qint32 t = *pw & 0x00ffffff;
         *pw++ = t + m;
     }
 }
@@ -916,8 +916,8 @@ void GLwindow::diceImgAlpha( QImage * pim, double alpha, int dw ){
     int r = 0, c = 0, w = pim->width();
 
     for( int i = w * pim->height(); i > 0; i-- ){
-        register qint32 t = *pw & 0x00ffffff;
-        register int d = 1;
+        qint32 t = *pw & 0x00ffffff;
+        int d = 1;
         if( dw ){  // dice...
             d = ((r + c) / dw) ^ ((r + w - c) / dw);
         }
--- a/src/panocylinder.cpp
+++ b/src/panocylinder.cpp
@@ -113,10 +113,10 @@ panocylinder::panocylinder( int divs ){
     double vs = 0.5 * DEG2RAD( 150 ) / double(r2);
 
     for( int r = 0; r < r2; r++){
-        register double t = tan( r * vs );
-        register float * pv = pv0;
-        register float * pu = pv0 + 3 *( cols + r * cols );
-        register float * pl = pv0 - 3 *( cols + r * cols );
+        double t = tan( r * vs );
+        float * pv = pv0;
+        float * pu = pv0 + 3 *( cols + r * cols );
+        float * pl = pv0 - 3 *( cols + r * cols );
         for( col = 0; col < cols; col++){
             *pu++ = *pv;
             *pl++ = *pv++;
--- a/src/panosphere.cpp
+++ b/src/panosphere.cpp
@@ -190,7 +190,7 @@ panosphere::panosphere( int divs ){
     float * ps = verts;	// -> front face
 
     for( int i = 0; i < ppf; i++ ){
-        register float * p = ps;
+        float * p = ps;
 
         p +=  jf;	// ->top
         p[0] = ps[0];	//  x = x
--- a/src/pvQtView.cpp
+++ b/src/pvQtView.cpp
@@ -465,7 +465,7 @@ void pvQtView::clipEyePosition(){
                 x = c * sin(azi),
                 y = sin(alt),
                 z = c * cos(azi);
-        register double s = eyeDistance;
+        double s = eyeDistance;
         // the cube texture is only 1 radius wide
         if( picType == pvQtPic::cub ) s *= 0.5;
         eyex = x * s;
-- 
2.42.0