Describe the need for `-o` option if multi files given.

parent b978231b
...@@ -33,7 +33,7 @@ usage(const char *name) ...@@ -33,7 +33,7 @@ usage(const char *name)
static const char *const usage_msg[] = { static const char *const usage_msg[] = {
"switches:", "switches:",
"-c check syntax only", "-c check syntax only",
"-o<outfile> place the output into <outfile>", "-o<outfile> place the output into <outfile>; required for multi-files",
"-v print version number, then turn on verbose mode", "-v print version number, then turn on verbose mode",
"-g produce debugging information", "-g produce debugging information",
"-B<symbol> binary <symbol> output in C language format", "-B<symbol> binary <symbol> output in C language format",
......
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