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How to link lex.yy.c with main.c by makefile?

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0

In main.c, I call getToken function, which is contained in lex.yy.c generated by flex. I want to compile them by using makefile

CC = gcc
TARGET = lexic

OBJS = util.o main.o

$(TARGET) : lex.yy.c util.o main.o
 $(CC) lex.yy.c -ll util.o main.o
util.o : globals.h util.h util.c
 $(CC) -c -o util.o util.c
main.o : globals.h util.h main.c
 $(CC) -o main.o main.c

I made like this, but the compiler couldn't find where getToken function is.

How can I solve this?

c

share|improve this question

edited Mar 26 at 13:42

Some programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

asked Mar 26 at 13:35

uninopknuninopkn

6388 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't include your header files in your call to the compiler. Also, use the -c flag when compiling main.c to obtain an object.
  
  – Thomas Jager
  Mar 26 at 13:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Take a closer look at how you build the main.o file. Are you sure you pass all the correct flags to build an object file? I recommend you learn about implicit rules which will cause make to build object files with the correct flags automatically.
  
  – Some programmer dude
  Mar 26 at 13:43
  
  

  
  
  
  

add a comment | 

0

In main.c, I call getToken function, which is contained in lex.yy.c generated by flex. I want to compile them by using makefile

CC = gcc
TARGET = lexic

OBJS = util.o main.o

$(TARGET) : lex.yy.c util.o main.o
 $(CC) lex.yy.c -ll util.o main.o
util.o : globals.h util.h util.c
 $(CC) -c -o util.o util.c
main.o : globals.h util.h main.c
 $(CC) -o main.o main.c

I made like this, but the compiler couldn't find where getToken function is.

How can I solve this?

c

share|improve this question

edited Mar 26 at 13:42

Some programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

asked Mar 26 at 13:35

uninopknuninopkn

6388 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't include your header files in your call to the compiler. Also, use the -c flag when compiling main.c to obtain an object.
  
  – Thomas Jager
  Mar 26 at 13:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Take a closer look at how you build the main.o file. Are you sure you pass all the correct flags to build an object file? I recommend you learn about implicit rules which will cause make to build object files with the correct flags automatically.
  
  – Some programmer dude
  Mar 26 at 13:43
  
  

  
  
  
  

add a comment | 

In main.c, I call getToken function, which is contained in lex.yy.c generated by flex. I want to compile them by using makefile

CC = gcc
TARGET = lexic

OBJS = util.o main.o

$(TARGET) : lex.yy.c util.o main.o
 $(CC) lex.yy.c -ll util.o main.o
util.o : globals.h util.h util.c
 $(CC) -c -o util.o util.c
main.o : globals.h util.h main.c
 $(CC) -o main.o main.c

I made like this, but the compiler couldn't find where getToken function is.

How can I solve this?

c

share|improve this question

edited Mar 26 at 13:42

Some programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

asked Mar 26 at 13:35

uninopknuninopkn

6388 bronze badges

CC = gcc
TARGET = lexic

OBJS = util.o main.o

$(TARGET) : lex.yy.c util.o main.o
 $(CC) lex.yy.c -ll util.o main.o
util.o : globals.h util.h util.c
 $(CC) -c -o util.o util.c
main.o : globals.h util.h main.c
 $(CC) -o main.o main.c

share|improve this question

edited Mar 26 at 13:42

Some programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

asked Mar 26 at 13:35

uninopknuninopkn

6388 bronze badges

share|improve this question

edited Mar 26 at 13:42

Some programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

asked Mar 26 at 13:35

uninopknuninopkn

6388 bronze badges

edited Mar 26 at 13:42

Some programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

edited Mar 26 at 13:42

Some programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

asked Mar 26 at 13:35

uninopknuninopkn

6388 bronze badges

asked Mar 26 at 13:35

uninopknuninopkn

6388 bronze badges

1 Answer
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0

The problem is that you don't build an object file named main.o, your rule attempt to build an executable by that name.

The simple and most immediate way to solve your problem is to add the -c flag when building:

main.o : globals.h util.h main.c
 $(CC) -c -o main.o main.c
# ^^
# Note flag added

---

A "better" and at least simpler way is to rely on the implicit rules that make have for creating, among other things, object and executable files.

Then you could simply have your Makefile look something like this:

# CFLAGS is the C compiler flags
# Add flags to enable verbose warnings (always a good idea)
CFLAGS = -Wall -Wextra -pedantic

TARGET = lexic

# The libraries to link the target application with
LDLIBS = -ll

# By default the make program uses the first target
default: $(TARGET)

# Because of the implicit rules, make will be able to link the executable by itself
$(TARGET): lex.yy.o util.o main.o

# Also because of implicit rules, object files will be created automatically as well
# But we list them here to specify their header-file dependencies
util.o main.o: globals.h util.h

Important note: The implicit rule for Lex files (including Flex) is to create the source file X.c from the file X.l. So unless your Lex file is names lex.yy.l then you need to change the name of the object file lex.yy.o in the above Makefile.

share|improve this answer

answered Mar 27 at 13:31

Some programmer dudeSome programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

add a comment | 

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0

The problem is that you don't build an object file named main.o, your rule attempt to build an executable by that name.

The simple and most immediate way to solve your problem is to add the -c flag when building:

main.o : globals.h util.h main.c
 $(CC) -c -o main.o main.c
# ^^
# Note flag added

---

A "better" and at least simpler way is to rely on the implicit rules that make have for creating, among other things, object and executable files.

Then you could simply have your Makefile look something like this:

# CFLAGS is the C compiler flags
# Add flags to enable verbose warnings (always a good idea)
CFLAGS = -Wall -Wextra -pedantic

TARGET = lexic

# The libraries to link the target application with
LDLIBS = -ll

# By default the make program uses the first target
default: $(TARGET)

# Because of the implicit rules, make will be able to link the executable by itself
$(TARGET): lex.yy.o util.o main.o

# Also because of implicit rules, object files will be created automatically as well
# But we list them here to specify their header-file dependencies
util.o main.o: globals.h util.h

Important note: The implicit rule for Lex files (including Flex) is to create the source file X.c from the file X.l. So unless your Lex file is names lex.yy.l then you need to change the name of the object file lex.yy.o in the above Makefile.

share|improve this answer

answered Mar 27 at 13:31

Some programmer dudeSome programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

add a comment | 

0

The problem is that you don't build an object file named main.o, your rule attempt to build an executable by that name.

The simple and most immediate way to solve your problem is to add the -c flag when building:

main.o : globals.h util.h main.c
 $(CC) -c -o main.o main.c
# ^^
# Note flag added

---

A "better" and at least simpler way is to rely on the implicit rules that make have for creating, among other things, object and executable files.

Then you could simply have your Makefile look something like this:

# CFLAGS is the C compiler flags
# Add flags to enable verbose warnings (always a good idea)
CFLAGS = -Wall -Wextra -pedantic

TARGET = lexic

# The libraries to link the target application with
LDLIBS = -ll

# By default the make program uses the first target
default: $(TARGET)

# Because of the implicit rules, make will be able to link the executable by itself
$(TARGET): lex.yy.o util.o main.o

# Also because of implicit rules, object files will be created automatically as well
# But we list them here to specify their header-file dependencies
util.o main.o: globals.h util.h

Important note: The implicit rule for Lex files (including Flex) is to create the source file X.c from the file X.l. So unless your Lex file is names lex.yy.l then you need to change the name of the object file lex.yy.o in the above Makefile.

share|improve this answer

answered Mar 27 at 13:31

Some programmer dudeSome programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

add a comment | 

The problem is that you don't build an object file named main.o, your rule attempt to build an executable by that name.

The simple and most immediate way to solve your problem is to add the -c flag when building:

main.o : globals.h util.h main.c
 $(CC) -c -o main.o main.c
# ^^
# Note flag added

---

A "better" and at least simpler way is to rely on the implicit rules that make have for creating, among other things, object and executable files.

Then you could simply have your Makefile look something like this:

# CFLAGS is the C compiler flags
# Add flags to enable verbose warnings (always a good idea)
CFLAGS = -Wall -Wextra -pedantic

TARGET = lexic

# The libraries to link the target application with
LDLIBS = -ll

# By default the make program uses the first target
default: $(TARGET)

# Because of the implicit rules, make will be able to link the executable by itself
$(TARGET): lex.yy.o util.o main.o

# Also because of implicit rules, object files will be created automatically as well
# But we list them here to specify their header-file dependencies
util.o main.o: globals.h util.h

Important note: The implicit rule for Lex files (including Flex) is to create the source file X.c from the file X.l. So unless your Lex file is names lex.yy.l then you need to change the name of the object file lex.yy.o in the above Makefile.

share|improve this answer

answered Mar 27 at 13:31

Some programmer dudeSome programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

main.o : globals.h util.h main.c
 $(CC) -c -o main.o main.c
# ^^
# Note flag added

# CFLAGS is the C compiler flags
# Add flags to enable verbose warnings (always a good idea)
CFLAGS = -Wall -Wextra -pedantic

TARGET = lexic

# The libraries to link the target application with
LDLIBS = -ll

# By default the make program uses the first target
default: $(TARGET)

# Because of the implicit rules, make will be able to link the executable by itself
$(TARGET): lex.yy.o util.o main.o

# Also because of implicit rules, object files will be created automatically as well
# But we list them here to specify their header-file dependencies
util.o main.o: globals.h util.h

share|improve this answer

answered Mar 27 at 13:31

Some programmer dudeSome programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

answered Mar 27 at 13:31

Some programmer dudeSome programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges

answered Mar 27 at 13:31

Some programmer dudeSome programmer dude

311k2626 gold badges279279 silver badges442442 bronze badges