guard linux identification in linux tags

src/lib/linux.c

@@ -669,18 +669,6 @@ int fbcon_rebuild(sprixel* s, int ycell, int xcell, uint8_t* auxvec){
   return 0;
 }
 
-bool is_linux_console(int fd, unsigned no_font_changes, bool* quadrants){
-  (void)fd;
-  (void)no_font_changes;
-  (void)quadrants;
-  return false;
-}
-
-bool is_linux_framebuffer(tinfo* ti){
-  (void)ti;
-  return false;
-}
-
 int get_linux_fb_pixelgeom(tinfo* ti, unsigned* ypix, unsigned *xpix){
   (void)ti;
   (void)ypix;

src/lib/termdesc.c

@@ -669,6 +669,7 @@ int interrogate_terminfo(tinfo* ti, int fd, unsigned utf8, unsigned noaltscreen,
 #ifdef __APPLE__
   qterm = macos_early_matches(tname);
 #endif
+#ifdef __linux__
   ti->linux_fb_fd = -1;
   ti->linux_fbuffer = MAP_FAILED;
   // we might or might not program quadrants into the console font
@@ -678,6 +679,7 @@ int interrogate_terminfo(tinfo* ti, int fd, unsigned utf8, unsigned noaltscreen,
       // FIXME set up pixel-drawing API for framebuffer #1369
     }
   }
+#endif
   if(fd >= 0){
     if(tcgetattr(fd, &ti->tpreserved)){
       fprintf(stderr, "Couldn't preserve terminal state for %d (%s)\n", fd, strerror(errno));

src/lib/termdesc.h

@@ -186,10 +186,12 @@ typedef struct tinfo {
   int default_rows; // LINES environment var / lines terminfo / 24
   int default_cols; // COLUMNS environment var / cols terminfo / 80
 
+#ifdef __linux__
   int linux_fb_fd;        // linux framebuffer device fd
   char* linux_fb_dev;     // device corresponding to linux_fb_dev
   uint8_t* linux_fbuffer; // mmap()ed framebuffer
   size_t linux_fb_len;    // size of map
+#endif
 
   // some terminals (e.g. kmscon) return cursor coordinates inverted from the
   // typical order. we detect it the first time ncdirect_cursor_yx() is called.