File gcc14.diff of Package prboom-plus

GLU uses a pre-C89 feature (functions with unspecified arguments);
that feature's syntax has new meaning in C23. POSIX systems have
C language extensions (for dlsym) and we can exploit that to get
GLU programs building again.

prboom2/src/gl_preprocess.c:497:41: error: passing argument 3 of ‘gluTessCallback’ from incompatible pointer type [-Wincompatible-pointer-types]
  497 |   gluTessCallback(tess, GLU_TESS_BEGIN, ntessBegin);
prboom2/src/gl_preprocess.c:498:42: error: passing argument 3 of ‘gluTessCallback’ from incompatible pointer type [-Wincompatible-pointer-types]
  498 |   gluTessCallback(tess, GLU_TESS_VERTEX, ntessVertex);
prboom2/src/gl_preprocess.c:499:41: error: passing argument 3 of ‘gluTessCallback’ from incompatible pointer type [-Wincompatible-pointer-types]
  499 |   gluTessCallback(tess, GLU_TESS_ERROR, ntessError);
prboom2/src/gl_preprocess.c:500:43: error: passing argument 3 of ‘gluTessCallback’ from incompatible pointer type [-Wincompatible-pointer-types]
  500 |   gluTessCallback(tess, GLU_TESS_COMBINE, ntessCombine);

Just signedness/constness:

prboom2/src/gl_shader.c:149:40: error: passing argument 3 of ‘ReadLump’ from incompatible pointer type [-Wincompatible-pointer-types]
  149 |   vp_size = ReadLump(filename, vpname, &vp_data);
prboom2/src/gl_shader.c:84:81: note: expected ‘unsigned char **’ but argument is of type ‘char **’
prboom2/src/gl_shader.c:165:51: error: passing argument 3 of ‘GLEXT_glShaderSourceARB’ from incompatible pointer type [-Wincompatible-pointer-types]
  165 |     GLEXT_glShaderSourceARB(shader->hVertProg, 1, &vp_data, &vp_size);
prboom2/src/gl_shader.c:166:51: error: passing argument 3 of ‘GLEXT_glShaderSourceARB’ from incompatible pointer type [-Wincompatible-pointer-types]
  166 |     GLEXT_glShaderSourceARB(shader->hFragProg, 1, &fp_data, &fp_size);

---
 prboom2/src/gl_preprocess.c |    8 ++++----
 prboom2/src/gl_shader.c     |   12 ++++++++----
 2 files changed, 12 insertions(+), 8 deletions(-)

Index: prboom2/src/gl_preprocess.c
===================================================================
--- prboom2/src/gl_preprocess.c.orig
+++ prboom2/src/gl_preprocess.c
@@ -494,10 +494,10 @@ static void gld_PrecalculateSector(int n
     return;
   }
   // set callbacks
-  gluTessCallback(tess, GLU_TESS_BEGIN, ntessBegin);
-  gluTessCallback(tess, GLU_TESS_VERTEX, ntessVertex);
-  gluTessCallback(tess, GLU_TESS_ERROR, ntessError);
-  gluTessCallback(tess, GLU_TESS_COMBINE, ntessCombine);
+  gluTessCallback(tess, GLU_TESS_BEGIN, (_GLUfuncptr)(void *)ntessBegin);
+  gluTessCallback(tess, GLU_TESS_VERTEX, (_GLUfuncptr)(void *)ntessVertex);
+  gluTessCallback(tess, GLU_TESS_ERROR, (_GLUfuncptr)(void *)ntessError);
+  gluTessCallback(tess, GLU_TESS_COMBINE, (_GLUfuncptr)(void *)ntessCombine);
   gluTessCallback(tess, GLU_TESS_END, ntessEnd);
   if (levelinfo) fprintf(levelinfo, "sector %i, %i lines in sector\n", num, sectors[num].linecount);
   // remove any line which has both sides in the same sector (i.e. Doom2 Map01 Sector 1)
Index: prboom2/src/gl_shader.c
===================================================================
--- prboom2/src/gl_shader.c.orig
+++ prboom2/src/gl_shader.c
@@ -146,10 +146,14 @@ static GLShader* gld_LoadShader(const ch
   filename = malloc(MAX(vp_fnlen, fp_fnlen) + 1);
 
   sprintf(filename, "%s/shaders/%s.txt", I_DoomExeDir(), vpname);
-  vp_size = ReadLump(filename, vpname, &vp_data);
+  unsigned char *xyz = NULL;
+  vp_size = ReadLump(filename, vpname, &xyz);
+  vp_data = (char *)xyz;
 
   sprintf(filename, "%s/shaders/%s.txt", I_DoomExeDir(), fpname);
-  fp_size = ReadLump(filename, fpname, &fp_data);
+  xyz = NULL;
+  fp_size = ReadLump(filename, fpname, &xyz);
+  fp_data = (char *)xyz;
   
   if (vp_data && fp_data)
   {
@@ -158,8 +162,8 @@ static GLShader* gld_LoadShader(const ch
     shader->hVertProg = GLEXT_glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
     shader->hFragProg = GLEXT_glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);	
 
-    GLEXT_glShaderSourceARB(shader->hVertProg, 1, &vp_data, &vp_size);
-    GLEXT_glShaderSourceARB(shader->hFragProg, 1, &fp_data, &fp_size);
+    GLEXT_glShaderSourceARB(shader->hVertProg, 1, (const char **)&vp_data, &vp_size);
+    GLEXT_glShaderSourceARB(shader->hFragProg, 1, (const char **)&fp_data, &fp_size);
 
     GLEXT_glCompileShaderARB(shader->hVertProg);
     GLEXT_glCompileShaderARB(shader->hFragProg);