Hi, On Fri, Nov 30, 2018 at 06:04:11AM +0000, wang tom via gcc-help wrote: > there are a lot of places to use dump_file, such as the following in ipa_inline.c: > if(dump_file) fprintf (dump_file, "\nFlattening functions:\n"); > And I don't know where is the dump_file being assigned a file name.Can I directly assign the file name and do fprintf() to output data?Or, is there something, like the format, I need to pay attention for? This is the dump file as you see with -fdump-combine-all or -fdump-rtl-tree etc. It magically switches to the correct pass for you. If there is no output file for your pass (like if the user did not use the -fdump-* things) it will be NULL, so your code will be like if (dump_file) fprintf (dump_file, "Hello there!\n"); Segher
