Mixing
Undefined reference to `WinMain@16' error when compile with gcc
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I'm going to run a simple program constructed with Flex an Bison.
Here are my codes.
Flex file (calc.l)
%{
#include <stdio.h>
#include <stdlib.h>
#include "tt.tab.h"
%}
/* %option noyywrap */
%%
[0-9]+(.[0-9]+)?([eE][0-9]+)? {yylval.f = atof(yytext); return NUM;}
[-+()*/] {return yytext[0];}
[tfvn] {;}
%%
int yywrap() {return -1}
Bison file (tt.y)
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
void yyerror(char *msg);
%}
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
%}
%union {
float f;
}
%token <f> NUM
%type <f> E T F
%%
S : E {printf("fn", $1);}
;
E : E '+' T {$$ = $1 + $3}
| T {$$ = $1;}
;
T : T '*' F {$$ = $1 * $3}
| F {$$ = $1;}
;
F : '(' E ')' {$$ = $2;}
| '-' F {$$ = -$2;}
| NUM {$$ = $1;}
%%
void yyerror(char *msg) {
fprintf(stderr, "%sn", msg);
exit(1);
}
To compile I follow follow commands in cmd.
Bison -d tt.y
Flex calc.l
gcc lex.yy.c tt.tab.c -o calc
when I run last gcc comman it got error like this.
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../libmingw32.a(main.o):(.text.startup+0xb0): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status
What is the problem in my codes or any. Thanks for any consideration :)
gcc compiler-construction bison flex-lexer
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
add a comment |
0
I'm going to run a simple program constructed with Flex an Bison.
Here are my codes.
Flex file (calc.l)
%{
#include <stdio.h>
#include <stdlib.h>
#include "tt.tab.h"
%}
/* %option noyywrap */
%%
[0-9]+(.[0-9]+)?([eE][0-9]+)? {yylval.f = atof(yytext); return NUM;}
[-+()*/] {return yytext[0];}
[tfvn] {;}
%%
int yywrap() {return -1}
Bison file (tt.y)
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
void yyerror(char *msg);
%}
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
%}
%union {
float f;
}
%token <f> NUM
%type <f> E T F
%%
S : E {printf("fn", $1);}
;
E : E '+' T {$$ = $1 + $3}
| T {$$ = $1;}
;
T : T '*' F {$$ = $1 * $3}
| F {$$ = $1;}
;
F : '(' E ')' {$$ = $2;}
| '-' F {$$ = -$2;}
| NUM {$$ = $1;}
%%
void yyerror(char *msg) {
fprintf(stderr, "%sn", msg);
exit(1);
}
To compile I follow follow commands in cmd.
Bison -d tt.y
Flex calc.l
gcc lex.yy.c tt.tab.c -o calc
when I run last gcc comman it got error like this.
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../libmingw32.a(main.o):(.text.startup+0xb0): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status
What is the problem in my codes or any. Thanks for any consideration :)
gcc compiler-construction bison flex-lexer
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
add a comment |
0
0
0
I'm going to run a simple program constructed with Flex an Bison.
Here are my codes.
Flex file (calc.l)
%{
#include <stdio.h>
#include <stdlib.h>
#include "tt.tab.h"
%}
/* %option noyywrap */
%%
[0-9]+(.[0-9]+)?([eE][0-9]+)? {yylval.f = atof(yytext); return NUM;}
[-+()*/] {return yytext[0];}
[tfvn] {;}
%%
int yywrap() {return -1}
Bison file (tt.y)
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
void yyerror(char *msg);
%}
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
%}
%union {
float f;
}
%token <f> NUM
%type <f> E T F
%%
S : E {printf("fn", $1);}
;
E : E '+' T {$$ = $1 + $3}
| T {$$ = $1;}
;
T : T '*' F {$$ = $1 * $3}
| F {$$ = $1;}
;
F : '(' E ')' {$$ = $2;}
| '-' F {$$ = -$2;}
| NUM {$$ = $1;}
%%
void yyerror(char *msg) {
fprintf(stderr, "%sn", msg);
exit(1);
}
To compile I follow follow commands in cmd.
Bison -d tt.y
Flex calc.l
gcc lex.yy.c tt.tab.c -o calc
when I run last gcc comman it got error like this.
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../libmingw32.a(main.o):(.text.startup+0xb0): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status
What is the problem in my codes or any. Thanks for any consideration :)
gcc compiler-construction bison flex-lexer
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
I'm going to run a simple program constructed with Flex an Bison.
Here are my codes.
Flex file (calc.l)
%{
#include <stdio.h>
#include <stdlib.h>
#include "tt.tab.h"
%}
/* %option noyywrap */
%%
[0-9]+(.[0-9]+)?([eE][0-9]+)? {yylval.f = atof(yytext); return NUM;}
[-+()*/] {return yytext[0];}
[tfvn] {;}
%%
int yywrap() {return -1}
Bison file (tt.y)
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
void yyerror(char *msg);
%}
%{
#include <stdio.h>
#include <stdlib.h>
extern int yylex();
%}
%union {
float f;
}
%token <f> NUM
%type <f> E T F
%%
S : E {printf("fn", $1);}
;
E : E '+' T {$$ = $1 + $3}
| T {$$ = $1;}
;
T : T '*' F {$$ = $1 * $3}
| F {$$ = $1;}
;
F : '(' E ')' {$$ = $2;}
| '-' F {$$ = -$2;}
| NUM {$$ = $1;}
%%
void yyerror(char *msg) {
fprintf(stderr, "%sn", msg);
exit(1);
}
To compile I follow follow commands in cmd.
Bison -d tt.y
Flex calc.l
gcc lex.yy.c tt.tab.c -o calc
when I run last gcc comman it got error like this.
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../libmingw32.a(main.o):(.text.startup+0xb0): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status
What is the problem in my codes or any. Thanks for any consideration :)
gcc compiler-construction bison flex-lexer
gcc compiler-construction bison flex-lexer
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
edited Jan 3 at 9:23
Georgi Hristozov
1,3981022
1,3981022
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
asked Jan 3 at 5:20
DhananjayaDhananjaya
204319
204319
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
You do not define the main function, the code generated by flex and bison do not define the main function, you have to define it by yourself else the program do not have an entry point.
You have problems in your definitions :
- in tt.y
{printf("fn", $1);}have a format not compatible with an argument, must be ``{printf("%fn", $1);}` ? - in tt.y declare yyerror in the header with the declaration of yylex
- in calc.l
int yywrap() {return -1}must beint yywrap() {return -1;}
The minimal main definition is :
int main()
{
yyparse();
return 0;
}
you can put it with the definition of yyerror in tt.y
answered Jan 3 at 8:30
brunobruno
13.4k31426
Where I have to define main() funtion, in .y file or .l file ?
– Dhananjaya
Jan 3 at 9:00
@Dhananjaya I edited my answer, please reread it. I think a%startis also missing in the bison file
– bruno
Jan 3 at 9:18
Thanks.. we have t define main() { return yyparse();} in .y file. I got it. :)
– Dhananjaya
Jan 3 at 9:29
yywrapneeds to return 1, not -1. Although it would be better to uncomment%option noyywrap, and not defineyywrapat all.
– rici
Jan 3 at 18:30
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
You do not define the main function, the code generated by flex and bison do not define the main function, you have to define it by yourself else the program do not have an entry point.
You have problems in your definitions :
- in tt.y
{printf("fn", $1);}have a format not compatible with an argument, must be ``{printf("%fn", $1);}` ? - in tt.y declare yyerror in the header with the declaration of yylex
- in calc.l
int yywrap() {return -1}must beint yywrap() {return -1;}
The minimal main definition is :
int main()
{
yyparse();
return 0;
}
you can put it with the definition of yyerror in tt.y
answered Jan 3 at 8:30
brunobruno
13.4k31426
Where I have to define main() funtion, in .y file or .l file ?
– Dhananjaya
Jan 3 at 9:00
@Dhananjaya I edited my answer, please reread it. I think a%startis also missing in the bison file
– bruno
Jan 3 at 9:18
Thanks.. we have t define main() { return yyparse();} in .y file. I got it. :)
– Dhananjaya
Jan 3 at 9:29
yywrapneeds to return 1, not -1. Although it would be better to uncomment%option noyywrap, and not defineyywrapat all.
– rici
Jan 3 at 18:30
add a comment |
1
You do not define the main function, the code generated by flex and bison do not define the main function, you have to define it by yourself else the program do not have an entry point.
You have problems in your definitions :
- in tt.y
{printf("fn", $1);}have a format not compatible with an argument, must be ``{printf("%fn", $1);}` ? - in tt.y declare yyerror in the header with the declaration of yylex
- in calc.l
int yywrap() {return -1}must beint yywrap() {return -1;}
The minimal main definition is :
int main()
{
yyparse();
return 0;
}
you can put it with the definition of yyerror in tt.y
answered Jan 3 at 8:30
brunobruno
13.4k31426
Where I have to define main() funtion, in .y file or .l file ?
– Dhananjaya
Jan 3 at 9:00
@Dhananjaya I edited my answer, please reread it. I think a%startis also missing in the bison file
– bruno
Jan 3 at 9:18
Thanks.. we have t define main() { return yyparse();} in .y file. I got it. :)
– Dhananjaya
Jan 3 at 9:29
yywrapneeds to return 1, not -1. Although it would be better to uncomment%option noyywrap, and not defineyywrapat all.
– rici
Jan 3 at 18:30
add a comment |
1
1
1
You do not define the main function, the code generated by flex and bison do not define the main function, you have to define it by yourself else the program do not have an entry point.
You have problems in your definitions :
- in tt.y
{printf("fn", $1);}have a format not compatible with an argument, must be ``{printf("%fn", $1);}` ? - in tt.y declare yyerror in the header with the declaration of yylex
- in calc.l
int yywrap() {return -1}must beint yywrap() {return -1;}
The minimal main definition is :
int main()
{
yyparse();
return 0;
}
you can put it with the definition of yyerror in tt.y
answered Jan 3 at 8:30
brunobruno
13.4k31426
You do not define the main function, the code generated by flex and bison do not define the main function, you have to define it by yourself else the program do not have an entry point.
You have problems in your definitions :
- in tt.y
{printf("fn", $1);}have a format not compatible with an argument, must be ``{printf("%fn", $1);}` ? - in tt.y declare yyerror in the header with the declaration of yylex
- in calc.l
int yywrap() {return -1}must beint yywrap() {return -1;}
The minimal main definition is :
int main()
{
yyparse();
return 0;
}
you can put it with the definition of yyerror in tt.y
answered Jan 3 at 8:30
brunobruno
13.4k31426
edited Jan 3 at 9:17
answered Jan 3 at 8:30
brunobruno
13.4k31426
answered Jan 3 at 8:30
brunobruno
13.4k31426
answered Jan 3 at 8:30
brunobruno
13.4k31426
13.4k31426
Where I have to define main() funtion, in .y file or .l file ?
– Dhananjaya
Jan 3 at 9:00
@Dhananjaya I edited my answer, please reread it. I think a%startis also missing in the bison file
– bruno
Jan 3 at 9:18
Thanks.. we have t define main() { return yyparse();} in .y file. I got it. :)
– Dhananjaya
Jan 3 at 9:29
yywrapneeds to return 1, not -1. Although it would be better to uncomment%option noyywrap, and not defineyywrapat all.
– rici
Jan 3 at 18:30
add a comment |
Where I have to define main() funtion, in .y file or .l file ?
– Dhananjaya
Jan 3 at 9:00
@Dhananjaya I edited my answer, please reread it. I think a%startis also missing in the bison file
– bruno
Jan 3 at 9:18
Thanks.. we have t define main() { return yyparse();} in .y file. I got it. :)
– Dhananjaya
Jan 3 at 9:29
yywrapneeds to return 1, not -1. Although it would be better to uncomment%option noyywrap, and not defineyywrapat all.
– rici
Jan 3 at 18:30
Where I have to define main() funtion, in .y file or .l file ?
– Dhananjaya
Jan 3 at 9:00
Where I have to define main() funtion, in .y file or .l file ?
– Dhananjaya
Jan 3 at 9:00
@Dhananjaya I edited my answer, please reread it. I think a
%start is also missing in the bison file– bruno
Jan 3 at 9:18
@Dhananjaya I edited my answer, please reread it. I think a
%start is also missing in the bison file– bruno
Jan 3 at 9:18
Thanks.. we have t define main() { return yyparse();} in .y file. I got it. :)
– Dhananjaya
Jan 3 at 9:29
Thanks.. we have t define main() { return yyparse();} in .y file. I got it. :)
– Dhananjaya
Jan 3 at 9:29
yywrap needs to return 1, not -1. Although it would be better to uncomment %option noyywrap, and not define yywrap at all.– rici
Jan 3 at 18:30
yywrap needs to return 1, not -1. Although it would be better to uncomment %option noyywrap, and not define yywrap at all.– rici
Jan 3 at 18:30
add a comment |
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