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bug#33029: AM_LFLAGS --prefix option breaks build-aux/ylwrap script

From: Sjoerd van Leent
Subject: bug#33029: AM_LFLAGS --prefix option breaks build-aux/ylwrap script
Date: Fri, 12 Oct 2018 23:35:49 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Dear Automake Maintainers,

Using Automake 1.15.1, I attempted to create a prefix other than the default "yy" for usage of the Fast Lexical Analyzer Generator. The FLEX arguments used for this, can be set using Automake option AM_LFLAGS and friends. Doing this with the --prefix argument however, causes a side-effect which the ylwrap script fails to act on. The option does not only replace yy inside the generated lex.yy.c file, but also changes lex.yy.c to become lex.<PREFIX>.c. This behavior breaks the ylwrap script, as it can no longer find lex.yy.c and therefore no longer move and rename it to the proper location (breaking the build process).

I managed my way around this, by forcing flex to generate a lex.yy.c file (adding -o lex.yy.c also to AM_LFLAGS). The solution to my mind is simple: if --prefix is used in the AM_LFLAGS and friends option, the ylwrap script should either expect this new prefix as a replacement token of the "yy" part of lex.yy.c, or ylwrap should add -o lex.yy.c on it's own initiative.

I hope that you are able to aid in repairing this minor deefficiency,
Best Regards,
Sjoerd van Leent

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