Compiler flags

soroush

Hi

I need to write a parser for a regular language. The parser is part of a C++ program, so it's source code goes inside a Qt project (hopefully). The language that should be parsed is a regular one, so I'm going to use flex++ to generate fastest possible parser class.

The problem is that I get errors during compilation. I think it's because of flags. The parser class should compiled and linked with -lfl flag. How do I change my .pro file or project setting for this?

ludek.vodicka

you can use QMAKE_CXXFLAGS for compiler flags and QMAKE_LFLAGS for linker flags in your .pro file.

for eaxmple:

@QMAKE_CXXFLAGS+=-Wno-ignored-qualifiers@

ZapB

Add this to your .pro file:

@
LIBS += -lfl
@

soroush

I tried both. but linker says 'undefined reference to yyFlexLexer::yywrap()' again.

goetz

Did you have a look at qmake's "LEXSOURCES":http://doc.qt.nokia.com/4.7/qmake-variable-reference.html#lexsources variable?

soroush

bq. Did you have a look at qmake’s LEXSOURCES [doc.qt.nokia.com] variable?

No I didn't even know they exist. I read them right now and don't understand how to use them. Could you explain what exactly should I do to obtain lexer class?

I currently put LEXSOURCES = rules.l in project file. so how should I do now?

(Googled around a lot but there is no clear description ! )

soroush

Ok that was mistake to put rules file, I should set LEXSOURCES to lex source files. now set LEXSOURCES = lex.yy.cc and have 995 errors.

I'm really confused