I am trying to use matlab libmat.dll in a C application. To compile my C application I use MinGW, for now I use matlab exemple "matcreate.c" and try to compile it, so the projects consist of only one file : main.c .
Here is the makefile I use :
MATINCLUDE = "C:\Program Files\MATLAB\R2010a\extern\include"
MATLIBRARY = "C:\Program Files\MATLAB\R2010a\bin\win64"
#
CC = gcc
LD = gcc
CFLAGS = -O3 -Wall
LFLAGS = -Wall -O3
LIBS = -I$(MATINCLUDE) -L$(MATLIBRARY)
#
PROG = matTest
LISTEOBJ = \
main.o
.c.o :
$(CC) -c $(CFLAGS) $(LIBS) -o $# $<
all : $(PROG)
$(PROG) : $(LISTEOBJ)
$(LD) -o $(PROG) $(LFLAGS) $(LISTEOBJ) $(LIBS)
clean :
rm -f *.obj
Here is what I get in the console
E:\Users\Desk\Dropbox\matTest>make
gcc -c -O3 -Wall -I"C:\Program Files\MATLAB\R2010a\extern\include" -L"C:\Pr
ogram Files\MATLAB\R2010a\bin\win64" -o main.o main.c
gcc -o Hello_world -Wall -O3 main.o -I"C:\Program Files\MATLAB\R2010a\extern\i
nclude" -L"C:\Program Files\MATLAB\R2010a\bin\win64"
main.o:main.c:(.text.startup+0x48): undefined reference to `matOpen'
main.o:main.c:(.text.startup+0x6e): undefined reference to `mxCreateDoubleMatrix
_730'
e:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: main.o: ba
d reloc address 0x6e in section `.text.startup'
e:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: final link
failed: Invalid operation
collect2.exe: error: ld returned 1 exit status
make: *** [Hello_world] Error 1
Why do I have "undefined reference to matOpen'" and "undefined reference to mxCreateDoubleMatrix" ?? those function are declared in mat.h. and I added #include "mat.h" to the begining of main.c
thank you
Looks like you have included the path to the matlab library, but not the library itself. You need to add a -l<libraryname> to your link line.
Related
I am struggling with building a program with multiple files whith inter files function calls with makefile in C. Let's say that I have a main file which call a function call_print_hello() declared in a header file fdeclar_macros.h and written in the file script1.c. The function call_print_hello() itself calls another function print_hello() also declared in fdeclar_macros.h and written in script2.c. I have also a makefile but when I run it I get the following error message:
gcc -g -Wall -c main.c
gcc -g -Wall -c script1.c
gcc -o main main.o script1.o
Undefined symbols for architecture x86_64:
"_call_print_hello", referenced from:
_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [main] Error 1
Here are the content of the files:
makefile:
CC = gcc
CFLAGS = -g -Wall
main: main.o script1.o
$(CC) -o main main.o script1.o
main.o: main.c fdeclar_macros.h
$(CC) $(CFLAGS) -c main.c
script2.o: script2.c fdeclar_macros.h
$(CC) $(CFLAGS) -c script2.c
script1.o: script1.c fdeclar_macros.h
$(CC) $(CFLAGS) -c script1.c
run: main
./main
clean:
$(RM) -rf justify *.dSYM *.o
main.c:
#include "fdeclar_macros.h"
int main(){
call_print_hello();
return 0;
}
fdeclar_macros.h:
#define NUMBER 3
void print_hello();
void call_print_hello();
script1.c:
#include <stdio.h>
#include "fdeclar_macros.h"
void print_hello(){
printf("hello %d\n", NUMBER);
}
script2.c:
#include "fdeclar_macros.h"
void call_print_hello(){
print_hello();
}
The make target for the main executable does not contain a dependency on script2.o and the rule to build main does not link script2.o into the main executable either.
So the linker tries to build an executable with the content of script2.o missing, but as that content is required, linking fails.
One easy fix would be to change the original rule
main: main.o script1.o
$(CC) -o main main.o script1.o
by adding script2.o:
main: main.o script1.o script2.o
$(CC) -o main main.o script1.o script2.o
I will leave finding more general rules as an exercise to the reader.
NAME = my_programm
CC = gcc
CFLAGS = -Wall -Werror -Wextra
MY_SOURCES = main.c script1.c script2.c
MY_OBJECTS = $(MY_SOURCES:.c=.o)
$(NAME): $(MY_OBJECTS)
#cc $(CFLAGS) $(MY_OBJECTS) -o $(NAME)
clean:
#rm -f $(MY_OBJECTS)
#rm -f $(NAME)
run:
./my_programm
I want to do makefile as the following, but I received this error:
gcc frparse.o frtags.o frscan.o frinit.o frstop.o frfoot.o frio.o -L/usr/local/image/lib/sgi -lioutil -lutil -o frparse
/usr/bin/ld: cannot find -lioutil
collect2: error: ld returned 1 exit status
Makefile:17: recipe for target 'frparse' failed
make: *** [frparse] Error 1
I would appreciate it if you guide me.
IMLIB = /usr/local/image/lib/sgi
LLIBS = -lioutil -lutil
it: frparse frcheck pgrep
OBJ = frparse.o frtags.o frscan.o frinit.o frstop.o frfoot.o frio.o
frparse.o: Makefile frparse.h frio.h frproto.h frstop.h frparse.c
frinit.o: Makefile frparse.h frproto.h frinit.c
frscan.o: Makefile frio.h frstop.h frscan.c
frfoot.o: Makefile frparse.h frproto.h frstop.h frfoot.c
frtags.o: Makefile frparse.h frio.h frproto.h frstop.h frtags.c
frstop.o: Makefile frstop.h frstop.c
frio.o: Makefile frio.c
frparse: $(OBJ)
gcc $(OBJ) -L$(IMLIB) $(LLIBS) -o $#
frcheck: frcheck.o
gcc frcheck.o -L$(IMLIB) $(LLIBS) -o $#
pgrep: pgrep.o
gcc pgrep.o -L$(IMLIB) $(LLIBS) -o $#
.c.o:
# cc -c -O2 -mips2 $<
gcc -c -g $<
regarding:
.c.o:
# cc -c -O2 -mips2 $<
gcc -c -g $<
The comment # must ALSO be indented via a <tab> otherwise the recipe never performs the third line
Also, the syntax is a bit obsolete suggest:
%.o:%.c
for the first line of the recipe
However, regarding your question:
Is there actually a library file named libioutil.so in the directory:
/usr/local/image/lib/sgi
I have a directory called reliability:
ls reliability
analyze.c appl.sh constr.c creer.c greedys.c Makefile
Now I want to install and compile it:
First of all the content of Makefile is:
CC = gcc
CFLAGS = -g -Wall -pthread
SRCS = constr.c creer.c analyze.c greedys.c
PROG = constr creer analyze greedys
all: $(PROG)
constr: constr.c
$(CC) $(CFLAGS) -o constr constr.c
creer: creer.c
$(CC) $(CFLAGS) -o creer creer.c
analyze: analyze.c
$(CC) $(CFLAGS) -o analyze analyze.c
greedys: greedys.c
$(CC) $(CFLAGS) -o greedys greedys.c
clean:
rm -f $(PROG)
When I start compiling it:
make -f Makefile
The error occurs:
gcc -g -Wall -pthread -o constr constr.c
/tmp/cca4NKQl.o: In function `main':
/home/t1/Desktop/reliability/constr.c:89: undefined reference to `exp'
/home/t1/Desktop/reliability/constr.c:89: undefined reference to `exp'
/home/t1/Desktop/reliability/constr.c:89: undefined reference to `pow'
/home/t1/Desktop/reliability/constr.c:89: undefined reference to `log'
collect2: ld returned 1 exit status
make: *** [constr] Error 1
I pass these errors by adding -lm to gcc,
Even when I change CFLAGS from Makefile to CFLAGS = -g -Wall -pthread -lm there is also that error.
My question:
Should I compile all .c programs separately now?
Thank you I really need help,
UPDATE
When I compile creer.c there is an error:
creer.c:39:10: warning: unused variable ‘val2’ [-Wunused-variable] creer.c:38:7:
warning: unused variable ‘val’ [-Wunused-variable]
Part of creer.c is:
void values(){
int val;
double val2;
FILE *fp;
fp = fopen("instances","r");
fseek(fp,0,SEEK_SET);
if(fscanf(fp,"%d",&p)==EOF){printf("EOF\n");}
if(fscanf(fp,"%d",&m)==EOF){printf("EOF\n");}
if(fscanf(fp,"%d",&K)==EOF){printf("EOF\n");}
if(fscanf(fp,"%lf",&lambda_com)==EOF){printf("EOF\n");}
if(fscanf(fp,"%d",&num_inst)==EOF){printf("EOF\n");}
if(fscanf(fp,"%d",&boundl)==EOF){printf("EOF\n");}
if(fscanf(fp,"%d",&boundp)==EOF){printf("EOF\n");}
fclose(fp);
}
You need to add that linker option -lm to the end of your command line.
Do something like this:
LDFLAGS=-lm
...
constr: constr.c
$(CC) $(CFLAGS) -o constr constr.c $(LDFLAGS)
Or you could define a pattern rule:
%: %.c
$(CC) $(CFLAGS) -o $# $< $(LDFLAGS)
and use it to replace all those rules for constr, creer, and so on.
Here is my console output:
Tylers-MacBook-Pro:laser_finder_c tylerjw$ make
gcc -g -Wall -c -o dots_img.o dots_img.c
gcc -g -Wall -c -o no_dots_img.o no_dots_img.c
gcc -g -Wall -c -o point.o point.c
gcc -g -Wall -c -o images.o images.c
gcc -g -Wall -c -o laser_finder_c.o laser_finder_c.c
gcc dots_img.o no_dots_img.o point.o images.o laser_finder_c.o -g -Wall -o laser_finder_c
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [laser_finder_c] Error 1
This doesn't seem to make any sense as the main function is defined in laser_finder_c.c. Below is my makefile. I'm real confused as to why this is happening.
TARGET = laser_finder_c
OBJECTS = dots_img.o no_dots_img.o point.o images.o laser_finder_c.o
#######################################################################################
CFLAGS = -g -Wall
ASFLAGS = -Wall
LDFLAGS = -g -Wall
CC = gcc
AS = gcc
########################################################################################
$(TARGET): $(OBJECTS)
$(CC) $(OBJECTS) $(LDFLAGS) -o $(TARGET)
point.o: point.h
images.o: images.h
laser_finder_c.o: images.h point.h
dots_img.o: images.h
no_dots_img.o: images.h
clean:
rm -f $(OBJECTS) $(TARGET)
Here is the definition of main in laser_finder_c.c
// laser_finder.c - finds the location of laser points comparing two images
#include "point.h"
#include <stdio.h>
#include <stdlib.h>
// #defines ... removed
int main()
{
// ... code removed
return 0;
}
For context the output of gcc -v is:
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix
#include<stdio.h>
#include "flite.h"
cst_voice *register_cmu_us_kal();
int main()
{
cst_voice *v;
cst_wave *w;
char *text = "Hello world programming";
//Initialising the flite variables used
flite_init();
w = new_wave();
v = register_cmu_us_kal(NULL);
flite_text_to_speech(text,v,"hello_wave");
if(cst_wave_load_riff(w,"hello_wave")!=CST_OK_FORMAT){
printf("\nCompare_wave:Can read file or wrong format!\n");
}
else{
play_wave(w);
}
return 0;
}
Makefile
all:compile \
./compile
compile:eg1.o
gcc -o $# eg1.o
eg1.o:eg1.c $(LIBS_DIR) $(INC_DIR) $(LIBS)
gcc -c $<
LIBS_DIR = -L /home/b/flite-1.4-release/build/i386-linux-gnu/lib
INC_DIR = -I /home/b/flite-1.4-relase/include
LIBS = -lflite_cmu_us_slt -lflite -lflite_cmulex -lflite_cmu_time_awb -lflite_cmu_us_kal16 -lflite_cmu_us_kal -lflite_cmu_usenglish
INCLUDE:
clean:
rm -f *.o
I tried by giving he library and header file paths as LIBS_DIR = ../build/i386-linux-gnu/lib and INC_DIR = ../include
I tried the folowing c program by including a third party library. This program an a makefile is located in b\flite-1.4-release\Learnin_though_example folder. Th flite libraries are located in b\flite-1.4-release\build\i386-linux-gnu\lib and the header files are in b\flite-1.4-release\include .
I assume that i have given the makefile th correct path to search for the files. But its not identifyin it and i'm gettin an error as,
make clean all
rm -f *.o
gcc -c eg1.c
eg1.c:2:19: error: flite.h: No such file or directory
eg1.c:3: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘*’ token
eg1.c: In function ‘main’:
eg1.c:6: error: ‘cst_voice’ undeclared (first use in this function)
eg1.c:6: error: (Each undeclared identifier is reported only once
eg1.c:6: error: for each function it appears in.)
eg1.c:6: error: ‘v’ undeclared (first use in this function)
eg1.c:7: error: ‘cst_wave’ undeclared (first use in this function)
eg1.c:7: error: ‘w’ undeclared (first use in this function)
eg1.c:17: error: ‘CST_OK_FORMAT’ undeclared (first use in this function)
make: *** [eg1.o] Error 1
Please help me understand what is the mistake i'm doing
EDITED:
I modiied th makefile as per matt's guidance:
all:compile
compile:eg1.o
gcc $(INC_DIR) $(LIB_DIR) -o $# $^ $(LIBS)
eg1.o:eg1.c
gcc $(INC_DIR) -o $# -c $^
LIBS_DIR = -L../build/i386-linux-gnu/lib
INC_DIR = -I../include
LIBS = -lflite -lflite_cmulex -lflite_cmu_time_awb -lflite_cmu_us_kal16 -lflite_cmu_us_kal -lflite_cmu_usenglish -lflite_cmu_us_slt
clean:
rm -f *.o
but i'm getting ifferent error whn compiled with the command "make clean all" as,
rm -f *.o
gcc -I../include -o eg1.o -c eg1.c
gcc -I../include -o compile eg1.o -lflite -lflite_cmulex -lflite_cmu_time_awb -lflite_cmu_us_kal16 -lflite_cmu_us_kal -lflite_cmu_usenglish -lflite_cmu_us_slt
/usr/bin/ld: cannot find -lflite
collect2: ld returned 1 exit status
make: *** [compile] Error 1
EDITED:
rm -f *.o
gcc -I../include -o eg1.o -c eg1.c
gcc -I../include -L../build/i386-linux-gnu/lib -o compile eg1.o -lflite -lflite_cmulex -lflite_cmu_time_awb -lflite_cmu_us_kal16 -lflite_cmu_us_kal -lflite_usenglish -lflite_cmu_us_slt -lflite_cmu_us_rms
../build/i386-linux-gnu/lib/libflite.so: undefined reference to `sin'
../build/i386-linux-gnu/lib/libflite.so: undefined reference to `exp'
../build/i386-linux-gnu/lib/libflite.so: undefined reference to `sqrt'
../build/i386-linux-gnu/lib/libflite.so: undefined reference to `log'
../build/i386-linux-gnu/lib/libflite.so: undefined reference to `fmod'
../build/i386-linux-gnu/lib/libflite.so: undefined reference to `pow'
Your makefile is, I'm afraid to say, completely broken.
The basic Makefile syntax is:
target: pre-requisite(s)
<tab>Stuff to do to build target from pre-reqs (if required)
So this is wrong, eg1.o can't be a pre-requisite for building itself.
compile:eg1.o
gcc -o eg1.o
You should have:
eg1.o: eg1.c
gcc $(INC_DIR) -o $# -c $^
($# is the target, $^ all the pre-reqs.)
Then you can:
myexe: eg1.o
gcc $(INC_DIR) $(LIBS_DIR) -o $# $^ $(LIBS)
This will produce myexe from eg1.o. And your all rule should be all: myexe, with no recipe (no commands), and at the top as you have it.
Then you've got your include directories and library directories mixed up. -I is for include paths, -L for library paths.
Place your variable definitions before the rules, that's more common/usual. And don't put a space between -L/-I and the path that follows it.
The include directories to search is specified by -I flag, not -L.
Change:
LIBS_DIR = -I /home/b/flite-1.4-release/build/i386-linux-gnu/lib
INC_DIR = -L /home/b/flite-1.4-relase/include
to:
LIBS_DIR = -L /home/b/flite-1.4-release/build/i386-linux-gnu/lib
INC_DIR = -I /home/b/flite-1.4-relase/include