How to link Zlib with Cmake

I am trying to link my file with the zlib libray but still get: undefined reference to `deflateInit_'.

I am currently using CLion, have downloaded the zLib file from the homepage and added it into the project. This is how my CmakeLists.txt looks like

cmake_minimum_required(VERSION 3.10) project(GzipTest)

set(CMAKE_CXX_STANDARD 11)

include_directories(ZLIB zlib-1.2.11)

add_executable(GzipTest main.cpp zlib-1.2.11/zlib.h)

And the code (Copying from the zpipe.c):

include "iostream"

include "zlib.h"

include "iostream"

define CHUNK 1639


FILE *fp;


int def(FILE *source, FILE *dest, int level)
 int ret, flush;
 unsigned have;
 z_stream strm;
 unsigned char in[CHUNK];
 unsigned char out[CHUNK];

 // Allocate Deflate state
 strm.zalloc = Z_NULL;
 strm.zfree = Z_NULL;
 strm.opaque = Z_NULL;

 ret = deflateInit(&strm, level);
 if (ret != Z_OK)
 return ret;
 




int main()
 fp = fopen("inputFile.txt", "r");
 if (fp == nullptr)
 perror("Could not open data");
 exit(EXIT_FAILURE);
 
 def(fp, fp, 1);

What could be missing?
Thanks in advance

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

asked Nov 14 '18 at 10:52

AKJ

529

Have you compiled zlib? Where is libzlib.so or similar?

– Kamil Cuk
Nov 14 '18 at 10:55

You don't build with the zlib source file, or link with the zlib library.

– Some programmer dude
Nov 14 '18 at 10:56

How to compile zlib?

– AKJ
Nov 14 '18 at 10:57

You have doanloaded a package, there is a README in it with the instructions on how to build it on all platforms. You can also directly get a prebuilt package.

– Matthieu Brucher
Nov 14 '18 at 10:59

Matthieu, the readme: # To install libz.a, zconf.h and zlib.h in the system directories, type: # # make install -fwin32/Makefile.gcc.

– AKJ
Nov 14 '18 at 11:23

add a comment |

I am trying to link my file with the zlib libray but still get: undefined reference to `deflateInit_'.

I am currently using CLion, have downloaded the zLib file from the homepage and added it into the project. This is how my CmakeLists.txt looks like

cmake_minimum_required(VERSION 3.10) project(GzipTest)

set(CMAKE_CXX_STANDARD 11)

include_directories(ZLIB zlib-1.2.11)

add_executable(GzipTest main.cpp zlib-1.2.11/zlib.h)

And the code (Copying from the zpipe.c):

include "iostream"

include "zlib.h"

include "iostream"

define CHUNK 1639


FILE *fp;


int def(FILE *source, FILE *dest, int level)
 int ret, flush;
 unsigned have;
 z_stream strm;
 unsigned char in[CHUNK];
 unsigned char out[CHUNK];

 // Allocate Deflate state
 strm.zalloc = Z_NULL;
 strm.zfree = Z_NULL;
 strm.opaque = Z_NULL;

 ret = deflateInit(&strm, level);
 if (ret != Z_OK)
 return ret;
 




int main()
 fp = fopen("inputFile.txt", "r");
 if (fp == nullptr)
 perror("Could not open data");
 exit(EXIT_FAILURE);
 
 def(fp, fp, 1);

What could be missing?
Thanks in advance

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

asked Nov 14 '18 at 10:52

AKJ

529

Have you compiled zlib? Where is libzlib.so or similar?

– Kamil Cuk
Nov 14 '18 at 10:55

You don't build with the zlib source file, or link with the zlib library.

– Some programmer dude
Nov 14 '18 at 10:56

How to compile zlib?

– AKJ
Nov 14 '18 at 10:57

You have doanloaded a package, there is a README in it with the instructions on how to build it on all platforms. You can also directly get a prebuilt package.

– Matthieu Brucher
Nov 14 '18 at 10:59

Matthieu, the readme: # To install libz.a, zconf.h and zlib.h in the system directories, type: # # make install -fwin32/Makefile.gcc.

– AKJ
Nov 14 '18 at 11:23

add a comment |

I am trying to link my file with the zlib libray but still get: undefined reference to `deflateInit_'.

I am currently using CLion, have downloaded the zLib file from the homepage and added it into the project. This is how my CmakeLists.txt looks like

cmake_minimum_required(VERSION 3.10) project(GzipTest)

set(CMAKE_CXX_STANDARD 11)

include_directories(ZLIB zlib-1.2.11)

add_executable(GzipTest main.cpp zlib-1.2.11/zlib.h)

And the code (Copying from the zpipe.c):

include "iostream"

include "zlib.h"

include "iostream"

define CHUNK 1639


FILE *fp;


int def(FILE *source, FILE *dest, int level)
 int ret, flush;
 unsigned have;
 z_stream strm;
 unsigned char in[CHUNK];
 unsigned char out[CHUNK];

 // Allocate Deflate state
 strm.zalloc = Z_NULL;
 strm.zfree = Z_NULL;
 strm.opaque = Z_NULL;

 ret = deflateInit(&strm, level);
 if (ret != Z_OK)
 return ret;
 




int main()
 fp = fopen("inputFile.txt", "r");
 if (fp == nullptr)
 perror("Could not open data");
 exit(EXIT_FAILURE);
 
 def(fp, fp, 1);

What could be missing?
Thanks in advance

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

asked Nov 14 '18 at 10:52

AKJ

529

I am trying to link my file with the zlib libray but still get: undefined reference to `deflateInit_'.

I am currently using CLion, have downloaded the zLib file from the homepage and added it into the project. This is how my CmakeLists.txt looks like

cmake_minimum_required(VERSION 3.10) project(GzipTest)

set(CMAKE_CXX_STANDARD 11)

include_directories(ZLIB zlib-1.2.11)

add_executable(GzipTest main.cpp zlib-1.2.11/zlib.h)

And the code (Copying from the zpipe.c):

include "iostream"

include "zlib.h"

include "iostream"

define CHUNK 1639


FILE *fp;


int def(FILE *source, FILE *dest, int level)
 int ret, flush;
 unsigned have;
 z_stream strm;
 unsigned char in[CHUNK];
 unsigned char out[CHUNK];

 // Allocate Deflate state
 strm.zalloc = Z_NULL;
 strm.zfree = Z_NULL;
 strm.opaque = Z_NULL;

 ret = deflateInit(&strm, level);
 if (ret != Z_OK)
 return ret;
 




int main()
 fp = fopen("inputFile.txt", "r");
 if (fp == nullptr)
 perror("Could not open data");
 exit(EXIT_FAILURE);
 
 def(fp, fp, 1);

What could be missing?
Thanks in advance

c cmake gzip zlib

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

asked Nov 14 '18 at 10:52

AKJ

529

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

asked Nov 14 '18 at 10:52

AKJ

529

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

edited Nov 14 '18 at 10:58

Matthieu Brucher

16.3k32143

asked Nov 14 '18 at 10:52

AKJ

529

asked Nov 14 '18 at 10:52

AKJ

529

asked Nov 14 '18 at 10:52

AKJ

529

Have you compiled zlib? Where is libzlib.so or similar?

– Kamil Cuk
Nov 14 '18 at 10:55

You don't build with the zlib source file, or link with the zlib library.

– Some programmer dude
Nov 14 '18 at 10:56

How to compile zlib?

– AKJ
Nov 14 '18 at 10:57

You have doanloaded a package, there is a README in it with the instructions on how to build it on all platforms. You can also directly get a prebuilt package.

– Matthieu Brucher
Nov 14 '18 at 10:59

Matthieu, the readme: # To install libz.a, zconf.h and zlib.h in the system directories, type: # # make install -fwin32/Makefile.gcc.

– AKJ
Nov 14 '18 at 11:23

add a comment |

Have you compiled zlib? Where is libzlib.so or similar?

– Kamil Cuk
Nov 14 '18 at 10:55

You don't build with the zlib source file, or link with the zlib library.

– Some programmer dude
Nov 14 '18 at 10:56

How to compile zlib?

– AKJ
Nov 14 '18 at 10:57

You have doanloaded a package, there is a README in it with the instructions on how to build it on all platforms. You can also directly get a prebuilt package.

– Matthieu Brucher
Nov 14 '18 at 10:59

Matthieu, the readme: # To install libz.a, zconf.h and zlib.h in the system directories, type: # # make install -fwin32/Makefile.gcc.

– AKJ
Nov 14 '18 at 11:23

Have you compiled zlib? Where is libzlib.so or similar?

– Kamil Cuk
Nov 14 '18 at 10:55

You don't build with the zlib source file, or link with the zlib library.

– Some programmer dude
Nov 14 '18 at 10:56

How to compile zlib?

– AKJ
Nov 14 '18 at 10:57

You have doanloaded a package, there is a README in it with the instructions on how to build it on all platforms. You can also directly get a prebuilt package.

– Matthieu Brucher
Nov 14 '18 at 10:59

Matthieu, the readme: # To install libz.a, zconf.h and zlib.h in the system directories, type: # # make install -fwin32/Makefile.gcc.

– AKJ
Nov 14 '18 at 11:23

add a comment |

1 Answer
1

active

oldest

votes

You have to link against zlib.

If you used:

find_package(ZLIB)

Then you should have:

target_link_libraries(GzipTest $ZLIB_LIBRARIES)

Also don't add the headers to your source files:

add_executable(GzipTest main.cpp)

edited Nov 14 '18 at 11:00

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

Should i replace $ZLIB_LIBRARIES with something? I get : CMake Error at CMakeLists.txt:9 (target_link_library): Unknown CMake command "target_link_library".

– AKJ
Nov 14 '18 at 10:59

That's assuming that you have the package built, and that you are setting the paths to find zlib for cmake properly. And yes, fixed a type, should be librarIES, not librarY.

– Matthieu Brucher
Nov 14 '18 at 11:00

@AKJ which version of cmake are you using?

– Philipp
Nov 14 '18 at 11:01

I am really a noob at this. Can you please instruct me on what to do?

– AKJ
Nov 14 '18 at 11:02

in the cmake-gui (or ccmake on Linux, but in that case, you should already have a zlib package with the system), you need to fill the path to zlib as the errors that find_package indicates.

– Matthieu Brucher
Nov 14 '18 at 11:04

|
show 1 more comment

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You have to link against zlib.

If you used:

find_package(ZLIB)

Then you should have:

target_link_libraries(GzipTest $ZLIB_LIBRARIES)

Also don't add the headers to your source files:

add_executable(GzipTest main.cpp)

edited Nov 14 '18 at 11:00

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

Should i replace $ZLIB_LIBRARIES with something? I get : CMake Error at CMakeLists.txt:9 (target_link_library): Unknown CMake command "target_link_library".

– AKJ
Nov 14 '18 at 10:59

That's assuming that you have the package built, and that you are setting the paths to find zlib for cmake properly. And yes, fixed a type, should be librarIES, not librarY.

– Matthieu Brucher
Nov 14 '18 at 11:00

@AKJ which version of cmake are you using?

– Philipp
Nov 14 '18 at 11:01

I am really a noob at this. Can you please instruct me on what to do?

– AKJ
Nov 14 '18 at 11:02

in the cmake-gui (or ccmake on Linux, but in that case, you should already have a zlib package with the system), you need to fill the path to zlib as the errors that find_package indicates.

– Matthieu Brucher
Nov 14 '18 at 11:04

|
show 1 more comment

You have to link against zlib.

If you used:

find_package(ZLIB)

Then you should have:

target_link_libraries(GzipTest $ZLIB_LIBRARIES)

Also don't add the headers to your source files:

add_executable(GzipTest main.cpp)

edited Nov 14 '18 at 11:00

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

Should i replace $ZLIB_LIBRARIES with something? I get : CMake Error at CMakeLists.txt:9 (target_link_library): Unknown CMake command "target_link_library".

– AKJ
Nov 14 '18 at 10:59

That's assuming that you have the package built, and that you are setting the paths to find zlib for cmake properly. And yes, fixed a type, should be librarIES, not librarY.

– Matthieu Brucher
Nov 14 '18 at 11:00

@AKJ which version of cmake are you using?

– Philipp
Nov 14 '18 at 11:01

I am really a noob at this. Can you please instruct me on what to do?

– AKJ
Nov 14 '18 at 11:02

in the cmake-gui (or ccmake on Linux, but in that case, you should already have a zlib package with the system), you need to fill the path to zlib as the errors that find_package indicates.

– Matthieu Brucher
Nov 14 '18 at 11:04

|
show 1 more comment

You have to link against zlib.

If you used:

find_package(ZLIB)

Then you should have:

target_link_libraries(GzipTest $ZLIB_LIBRARIES)

Also don't add the headers to your source files:

add_executable(GzipTest main.cpp)

edited Nov 14 '18 at 11:00

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

You have to link against zlib.

If you used:

find_package(ZLIB)

Then you should have:

target_link_libraries(GzipTest $ZLIB_LIBRARIES)

Also don't add the headers to your source files:

add_executable(GzipTest main.cpp)

edited Nov 14 '18 at 11:00

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

edited Nov 14 '18 at 11:00

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

answered Nov 14 '18 at 10:56

Matthieu Brucher

16.3k32143

Should i replace $ZLIB_LIBRARIES with something? I get : CMake Error at CMakeLists.txt:9 (target_link_library): Unknown CMake command "target_link_library".

– AKJ
Nov 14 '18 at 10:59

That's assuming that you have the package built, and that you are setting the paths to find zlib for cmake properly. And yes, fixed a type, should be librarIES, not librarY.

– Matthieu Brucher
Nov 14 '18 at 11:00

@AKJ which version of cmake are you using?

– Philipp
Nov 14 '18 at 11:01

I am really a noob at this. Can you please instruct me on what to do?

– AKJ
Nov 14 '18 at 11:02

in the cmake-gui (or ccmake on Linux, but in that case, you should already have a zlib package with the system), you need to fill the path to zlib as the errors that find_package indicates.

– Matthieu Brucher
Nov 14 '18 at 11:04

|
show 1 more comment

Should i replace $ZLIB_LIBRARIES with something? I get : CMake Error at CMakeLists.txt:9 (target_link_library): Unknown CMake command "target_link_library".

– AKJ
Nov 14 '18 at 10:59

That's assuming that you have the package built, and that you are setting the paths to find zlib for cmake properly. And yes, fixed a type, should be librarIES, not librarY.

– Matthieu Brucher
Nov 14 '18 at 11:00

@AKJ which version of cmake are you using?

– Philipp
Nov 14 '18 at 11:01

I am really a noob at this. Can you please instruct me on what to do?

– AKJ
Nov 14 '18 at 11:02

in the cmake-gui (or ccmake on Linux, but in that case, you should already have a zlib package with the system), you need to fill the path to zlib as the errors that find_package indicates.

– Matthieu Brucher
Nov 14 '18 at 11:04

Should i replace $ZLIB_LIBRARIES with something? I get : CMake Error at CMakeLists.txt:9 (target_link_library): Unknown CMake command "target_link_library".

– AKJ
Nov 14 '18 at 10:59

That's assuming that you have the package built, and that you are setting the paths to find zlib for cmake properly. And yes, fixed a type, should be librarIES, not librarY.

– Matthieu Brucher
Nov 14 '18 at 11:00

@AKJ which version of cmake are you using?

– Philipp
Nov 14 '18 at 11:01

I am really a noob at this. Can you please instruct me on what to do?

– AKJ
Nov 14 '18 at 11:02

in the cmake-gui (or ccmake on Linux, but in that case, you should already have a zlib package with the system), you need to fill the path to zlib as the errors that find_package indicates.

– Matthieu Brucher
Nov 14 '18 at 11:04

|
show 1 more comment

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