Commit ca0ba5df0fb8d3a62919b878ee30fa573dde6f93
2011-10-24T23:18:34
tests: fix spurious failures due to missing 'yywrap()' function The AC_PROG_LEX Autoconf macro does not diagnose a failure to find the "lex library" expected to provide a `yywrap' function (function which is required to link most lex-generated programs). On the contrary, when all the link attempts (i.e., with `-ll' and `-lfl') fail, configure declares that no lex library is needed, and simply proceeds with the configuration process -- only for the build to possibly fail later, at make time. This behaviour is intended; the Autoconf manual reads: ``You are encouraged to use Flex in your sources, since it is both more pleasant to use than plain Lex and the C source it produces is portable. In order to ensure portability, however, you must either provide a function `yywrap' or, if you don't use it (e.g., your scanner has no `#include'-like feature), simply include a `%noyywrap' statement in the scanner's source.'' This AC_PROG_LEX behaviour is causing some spurious failures of the Automake testsuite in environments which lack a proper library providing `yywrap' (this happens for example on Fedora-based systems). The proper workaround is to simply provide a fall-back implementation of `yywrap' in our lexers. * tests/cond35.test: Provide a dummy `yywrap' function. * tests/lex3.test: Likewise. * tests/silent-lex-generic.test: Likewise. * tests/silent-lex-gcc.test: Likewise. * tests/silent-many-generic.test: Likewise. * tests/silent-many-gcc.test: Likewise. Reported by Jim Meyering: <http://lists.gnu.org/archive/html/automake-patches/2011-10/msg00092.html> Cherry-picked (with some edits) from commits `v1.11-1085-gb5c3968' (master) and `v1.11-871-geb147a1' (testsuite-work).