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bug#19020: flex support
From: |
Stefano Lattarini |
Subject: |
bug#19020: flex support |
Date: |
Fri, 19 Dec 2014 20:53:55 +0100 |
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
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