qmake+flex dependency problem

[nurtsi]

Hi,

I'm trying to use flex with qmake but I can't get the dependencies right. I want to keep the generated code in separate files. Here's a simple test to illustrate the problem:

main.cpp:

#include "parser.h"
 
int main(int argc, char ** argv)
{
  argv++; argc--;
 
  if(--argc > 0)
    parserin = fopen(++argv[0], "r");
  else parserin = stdin;
 
  parserlex();
 
  return 0;
}

#include "parser.h"

int main(int argc, char ** argv)
{
  argv++; argc--;

  if(--argc > 0)
    parserin = fopen(++argv[0], "r");
  else parserin = stdin;

  parserlex();

  return 0;
}

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parser.l:

%option noyywrap
 
%%
 
%%

%option noyywrap

%%

%%

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And finally the makefile:

TEMPLATE = app
 
SOURCES += main.cpp
 
LEXSOURCES += parser.l
 
QMAKE_LEX = flex
QMAKE_LEXFLAGS = --header-file=parser.h
 
TARGET = ParserTest
 
LIBS += -lfl
 
CONFIG -= qt

TEMPLATE = app

SOURCES += main.cpp

LEXSOURCES += parser.l

QMAKE_LEX = flex
QMAKE_LEXFLAGS = --header-file=parser.h

TARGET = ParserTest

LIBS += -lfl

CONFIG -= qt

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The problem is that qmake tries to compile main.cpp first that depends on the generated parser.h (which doesn't exist). How can I tell qmake about this dependency? I tried defining custom compilers for flex, but the dependency problem is still there.

[nurtsi]

A simple solution seems to be building the flex stuff into a library and then linking that against a separate application so the order of compilation doesn't matter.

Though I'm still curious how to define the dependencies so that the application in the first post is built correctly.