https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102206
--- Comment #9 from Greg Turner <g...@be-evil.net> --- Never mind, corrected version is quite equivalent: --- xml_grammar_gcc_-E.cpp 2021-09-06 01:38:48.125773266 -0700 +++ xml_grammar_gcc_-E-try2.cpp 2021-09-06 01:49:24.384875598 -0700 @@ -1,4 +1,5 @@ # 0 "libs/serialization/src/xml_grammar.cpp" +# 1 "/var/tmp/portage/dev-libs/boost-1.76.0-r1/work/boost_1_76_0-abi_x86_64.amd64//" # 0 "<built-in>" # 0 "<command-line>" # 1 "/usr/include/stdc-predef.h" 1 3 4 :)