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Back in 2020 Nathan rewrote the -E -fdirectives-only preprocessing. In PR103130 a year and half later I've fixed the handling of comments so that /* \*/ is considered as full comment even when * is escaped, to match the normal preprocessing. The following testcases shows further bugs in the comment handling. One is that /* *\/ should not be considered as full comment (i.e. when the / after * is escaped). And another one is that the code was treating any number of backslashes as escape, which is wrong, only a single backslash is an escape, two backslashes preprocess as one backslash, three as one backslash and one escape, etc. So, while /* *\ / is a full comment, /* *\\ / or /* *\\\\\\\\\\\\\ / is not. 2026-01-30 Jakub Jelinek <jakub@redhat.com> PR preprocessor/123273 * lex.cc (cpp_directive_only_process): Only go to done_comment for '/' if star is true and esc is false. When seeing '\\' with esc set to true, clear esc as well as star instead of keeping esc set. * c-c++-common/cpp/dir-only-10.c: New test. * c-c++-common/cpp/dir-only-11.c: New test.
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