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Sometimes `inline` would be used in *.cc files on symbols that are not exported (useless but harmless), and sometimes on exported symbols such as the constructor of syntax_error (harmful: linking fails). Reported several times, including: - by Dennis T http://lists.gnu.org/archive/html/bug-bison/2016-03/msg00002.html - by Frank Heckenbach https://savannah.gnu.org/patch/?9616 * data/c++.m4 (b4_inline): New: expands to `inline` or nothing. Use it where appropriate. * data/lalr1.cc: Use it where appropriate. * tests/c++.at (Syntax error as exception): Put the scanner in another compilation unit to exercise the constructor of syntax_error.