On 08/15/2015 02:42 PM, W. Michael Petullo wrote:
I am using: cpp -C -P -nostdinc -std=c99 -Werror to process something that is not C. Everything works, except that one side effect of "-P" is that consecutive newlines are compressed into one. Is this intentional? Why? Is there a way to avoid collapsing consecutive newlines when using "cpp -P"?
My guess based on stepping through the code and the absence of tests for this behavior is that it's not intentional, and possibly a bug. A quick hack to the print_line_1 function in gcc/c-family/c-ppoutput.c makes it (almost) work and doesn't cause any of the cmdlne-dU-* tests to fail, so a fix shouldn't be too onerous. With -P, when line directives aren't emitted, it seems reasonable to expect the preprocessor to preserve the newlines. I suggest to open a bug in Bugzilla for this. Martin
