Hi Friend, I was in search for a long time to get a platform in windows-7 to run lex and Yacc,for academic purposes. Many of my friends also had the same problem and often forced to choose Linux only for merely executing Lex & Yacc programs.!!! Online C compiler is online editor and compiler. C, C, Java, Ruby, Python, PHP, Perl. More than 20 languages are supported. Paiza.IO is online editor and compiler where you can write and run code instantly. Whenever you come up with new idea, learn or teach programming, you and others can just write and run code.
I'm having
Lex
and YACC
files to parse my files (.l
file and .y
file).How to compile those files and how to make equivalent
Enamul Hassan.c
file for them in windows platform?3,9031111 gold badges3030 silver badges4545 bronze badges
Thorin OakenshieldThorin Oakenshield6,3072828 gold badges9090 silver badges137137 bronze badges
9 Answers
As for today (2011-04-05, updated 2017-11-29) you will need the lastest versions of:
- After that, do a full install in a directory of your preference without spaces in the name. I suggest
C:GnuWin32
. Do not install it in the default (C:Program Files (x86)GnuWin32) because bison has problems with spaces in directory names, not to say parenthesis. - Also, consider installing Dev-CPP in the default directory (
C:Dev-Cpp
) - After that, set the PATH variable to include the bin directories of
gcc
(inC:Dev-Cppbin
) andflexbison
(inC:GnuWin32bin
). To do that, copy this:;C:Dev-Cppbin;C:GnuWin32bin
and append it to the end of thePATH
variable, defined in the place show by this figure:
If the figure is not in good resolution, you can see a step-by-step here. - Open a prompt, cd to the directory where your '.l' and '.y' are, and compile them with:
flex hello.l
bison -dy hello.y
gcc lex.yy.c y.tab.c -o hello.exe
You will be able to run the program. I made the sources for a simple test (the infamous
Hello World
):Hello.l
Hello.y
Edited: avoiding 'warning: implicit definition of yyerror and yylex'.
Disclaimer: remember, this answer is very old (since 2011!) and if you run into problems due to versions and features changing, you might need more research, because I can't update this answer to reflect new itens. Thanks and I hope this will be a good entry point for you as it was for many.
Updates: if something (really small changes) needs to be done, please check out the official repository at github: https://github.com/drbeco/hellex
Happy hacking.
Dr BecoDr Beco7,22266 gold badges4242 silver badges6262 bronze badges
What you (probably want) are Flex 2.5.4 (some people are now 'maintaining' it and producing newer versions, but IMO they've done more to screw it up than fix any real shortcomings) and byacc 1.9 (likewise). (Edit 2017-11-17: Flex 2.5.4 is not available on Sourceforge any more, and the Flex github repository only goes back to 2.5.5. But you can apparently still get it from a Gnu ftp server at ftp://ftp.gnu.org/old-gnu/gnu-0.2/src/flex-2.5.4.tar.gz.)
Since it'll inevitably be recommended, I'll warn against using Bison. Bison was originally written by Robert Corbett, the same guy who later wrote Byacc, and he openly states that at the time he didn't really know or understand what he was doing. Unfortunately, being young and foolish, he released it under the GPL and now the GPL fans push it as the answer to life's ills even though its own author basically says it should be thought of as essentially a beta test product -- but by the convoluted reasoning of GPL fans, byacc's license doesn't have enough restrictions to qualify as 'free'!
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Jerry CoffinJerry Coffin394k5757 gold badges489489 silver badges932932 bronze badges
There are ports of flex and bison for windows here: http://gnuwin32.sourceforge.net/
flex is the free implementation of lex. bison is the free implementation of yacc.
RBerteig34.9k55 gold badges7474 silver badges116116 bronze badges
lesmanalesmana18.1k66 gold badges6262 silver badges7575 bronze badges
You can find the latest windows version of flex & bison here: http://sourceforge.net/projects/winflexbison/
bakoyaro2,04633 gold badges3131 silver badges5555 bronze badges
LexxmarkLexxmark
SkurmedelSkurmedel16.7k55 gold badges4343 silver badges6363 bronze badges
Go for the full installation of Git for windows (with Unix tool), and
Archy Will HeArchy Will Hebison
and flex
would come with it in the bin
folder.6,80444 gold badges2222 silver badges4242 bronze badges
Also worth noting that WinFlexBison has been packaged for the Chocolatey package manager. Install that and then go:
...which at the time of writing contains Bison 2.7 & Flex 2.6.3.
There is also
Alastair MawAlastair Mawwinflexbison3
which (at the time of writing) has Bison 3.0.4 & Flex 2.6.3.3,77711 gold badge3030 silver badges4444 bronze badges
the easiest method is to download and install cygwin and download gcc and flex packages during installation.Then to run a lex file for eg. abc.l
we write
flex abc.l
gcc lex.yy.c -o abc.exe
./abc.exe
aayush shahaayush shah
I was having the same problem, it has a very simple solution.
Steps for executing the 'Lex' program:
Steps for executing the 'Lex' program:
- Tools->'Lex File Compiler'
- Tools->'Lex Build'
- Tools->'Open CMD'
- Then in command prompt type 'name_of_file.exe' example->'1.exe'
- Then entering the whole input press Ctrl + Z and press Enter.
סטנלי גרונן
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Amit Amit
Not the answer you're looking for? Browse other questions tagged windowsbisonyacclexflex-lexer or ask your own question.
I am very new to Lex and Yacc. I have a Lex program. Example:
wordcount.l
I am using windows and putty.
I am just trying to run this file..
- Does the
wordcount.l
file go on the C drive? - Do I compile the Lex program and it generates a
.c
program and then what do I run?
I tried on the command-line: Lex
wordcount.l
but I just get file not found...
wordcount.l
In putty how do I compile and run this program?
Farshid70822 gold badges1414 silver badges3939 bronze badges
user249375
2 Answers
You first have to go to the directory which the file
Bilal Syed HussainBilal Syed Hussainwordcount.l
is in using cd
. Then using lex wordcount.l
will make the file lex.yy.c
. To the run the program you need compile it with a c compiler such as gcc. With gcc you can compile it using gcc -lfl lex.yy.c
. This will create a.out
which can be run using ./a.out
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These also works. I am using this in Ubuntu 14.04.
alhelalalhelal