core: ignore -Wunused-result for some read/write

src/error.c

@@ -3,6 +3,12 @@
 #include <stdio.h>
 #include <stdarg.h>
 
+/** Ignore warning:
+ * ignoring return value of ‘write’, declared with attribute warn_unused_result
+ * Because we write to STDERR_FILENO & don't need to check write() return.
+ */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
 
 /** Print a formatted warning message without leaving the program.
  * The use of printf() inside this function causes it
@@ -50,3 +56,5 @@ void            die(const char *msg)
     perror(msg);
     exit(1);
 }
+
+#pragma GCC diagnostic pop

src/file.c

@@ -12,9 +12,8 @@
 #include "debug.h"
 #include "bytesize.h"
 
-# define FILE_ISSET(_f) ((_f)->fd >= 0)
-
-# define BUF_SIZE       (0x20000) /* 128kb */
+#define FILE_ISSET(_f) ((_f)->fd >= 0)
+#define BUF_SIZE       (0x20000) /* 128kb */
 
 
 static struct file  g_infile;

src/user_input.c

@@ -25,7 +25,10 @@ static void *watch_user_input_worker(void *arg)
     {
 #if DEBUG_PROGRAM_STATUS == 0
         memset(input, 0, BUF_SIZE);
+# pragma GCC diagnostic push // no need to check read()'s return here
+# pragma GCC diagnostic ignored "-Wunused-result"
         read(STDIN_FILENO, input, BUF_SIZE - 1);
+# pragma GCC diagnostic pop
 #else
         usleep(100000);
 #endif