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gcc-10 defaults to -fno-common. Causes linker errors for
duplicate 'buffer' definition.
--- a/mmix-config.w
+++ b/mmix-config.w
@@ -357,7 +357,7 @@ print error messages.
@<Global variables@>=
FILE *config_file; /* input comes from here */
-char buffer[BUF_SIZE]; /* input lines go here */
+static char buffer[BUF_SIZE]; /* input lines go here */
char token[BUF_SIZE]; /* and tokens are copied to here */
char *buf_pointer=buffer; /* this is our current position */
bool token_prescanned; /* does |token| contain the next token already? */
--- a/mmmix.w
+++ b/mmmix.w
@@ -115,7 +115,7 @@ and \Hex{fedcba9876543210} into location \Hex{0123456789b0}.
octa cur_loc;
octa cur_dat;
bool new_chunk;
-char buffer[BUF_SIZE];
+static char buffer[BUF_SIZE];
FILE *prog_file;
@ @<Input a rudimentary hexadecimal file@>=
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