tectonic: avoid assigning const value to non const variable

-Wdiscarded-qualifiers

Author: ronnychevalier

tectonic/core-bridge.c

@@ -4,9 +4,11 @@
 */
 
 #include <tectonic/core-bridge.h>
+#include <tectonic/internals.h>
 
 #include <stdio.h> /*vsnprintf*/
 #include <stdarg.h>
+#include <stdlib.h>
 #include <setjmp.h>
 
 
@@ -69,7 +71,7 @@ dvipdfmx_simple_main(tt_bridge_api_t *api, char *dviname, char *pdfname)
 {
     extern int dvipdfmx_main(int argc, char *argv[]);
 
-    char *argv[] = { "dvipdfmx", "-o", pdfname, dviname };
+    char *argv[] = { xstrdup("dvipdfmx"), xstrdup("-o"), pdfname, dviname };
     int rv;
 
     tectonic_global_bridge = api;
@@ -81,6 +83,10 @@ dvipdfmx_simple_main(tt_bridge_api_t *api, char *dviname, char *pdfname)
 
     rv = dvipdfmx_main(4, argv);
     tectonic_global_bridge = NULL;
+
+    free(argv[0]);
+    free(argv[1]);
+
     return rv;
 }
 

tectonic/xetexini.c

@@ -3736,7 +3736,7 @@ tt_run_engine(char *dump_name, char *input_file_name)
     /* Make this something invariant so that we can use XDV files to test
      * reproducibility of the engine output. */
 
-    output_comment = "tectonic";
+    output_comment = xstrdup("tectonic");
 
     /* These various parameters were configurable in web2c TeX. We don't
      * bother to allow that. */
@@ -4192,5 +4192,6 @@ tt_run_engine(char *dump_name, char *input_file_name)
     final_cleanup();
     close_files_and_terminate();
     pdf_files_close();
+    free(output_comment);
     return history;
 }