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#19020
improve support for flex in C++ mode
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(Tue, 11 Nov 2014 16:42:01 GMT)
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brahim sahbi <brahim.sahbi <at> gmail.com>
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
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Hello,
I am trying to use flex with these options
AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
So this command in the generated Makefile:
.lpp.cpp:
$(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
-- $(LEXCOMPILE)
turns my lang.lpp to lang.cppc
I have looked in the ylwrap by launching it with $(SHELL) -x and had this
printed
++ printf '%s\n' lex.yy.cc
++ sed 's|lex\.yy\.c|lang.cpp|g;'
+ to=lang.cppc
Am I doing it worng or is this a bug?
Thanks.
--
Brahim SAHBI
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(Fri, 19 Dec 2014 19:55:02 GMT)
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Message #8 received at 19020 <at> debbugs.gnu.org (full text, mbox):
retitle 19020 improve support for flex in C++ mode
tags 19020 + moreinfo
thanks
Reference: http://debbugs.gnu.org/19020
On 11/11/2014 11:51 AM, brahim sahbi wrote:
> Hello,
>
Hi, sorry for the delay.
> I am trying to use flex with these options
> AM_LFLAGS = --header-file=lang.h --yyclass=Lang --c++
> My problem is that the file generated by lex is lex.yy.cc and not lex.yy.c.
> So this command in the generated Makefile:
> .lpp.cpp:
> $(AM_V_LEX)$(am__skiplex) $(SHELL) $(YLWRAP) $< $(LEX_OUTPUT_ROOT).c $@
> -- $(LEXCOMPILE)
>
> turns my lang.lpp to lang.cppc
>
> I have looked in the ylwrap by launching it with $(SHELL) -x and had this
> printed
> ++ printf '%s\n' lex.yy.cc
> ++ sed 's|lex\.yy\.c|lang.cpp|g;'
> + to=lang.cppc
>
> Am I doing it worng or is this a bug?
>
This is sadly a limitation, in that we must assume that the output generated
by lex and flex when a '-o' option is not given is 'yy.lex.c' (this would
not be needed if we could assume the '-o' option works, but that assumption
is not portable enough yet). The --c++ option of flex seem to break this
expectation of the ylwrap script. I *think* it can be worked around by
explicitly adding "-o lex.yy.c" to your AM_LFLAGS. Can you verify that
solves your problem?
Thanks,
Stefano
Changed bug title to 'improve support for flex in C++ mode' from 'flex support'
Request was from
Stefano Lattarini <stefano.lattarini <at> gmail.com>
to
control <at> debbugs.gnu.org
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(Fri, 19 Dec 2014 19:55:03 GMT)
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Added tag(s) moreinfo.
Request was from
Stefano Lattarini <stefano.lattarini <at> gmail.com>
to
control <at> debbugs.gnu.org
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(Fri, 19 Dec 2014 19:55:03 GMT)
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This bug report was last modified 9 years and 147 days ago.
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