CMake CHECK_FUNCTION_EXISTS for a function requiring #defineWhat does “#define _GNU_SOURCE” imply?Symbol lookup in CMake fails although symbol is presentcmake and libpthreadWhat is CMake equivalent of 'configure --prefix=DIR && make all install '?Debug vs Release in CMakeDefine preprocessor macro through cmakeLooking for a 'cmake clean' command to clear up CMake outputCMake : <pthread.h> not found in WindowsCMake install is not installing libraries on Windowscmake try_compile: Using library found in configurecmake using corrext c++ standard when checking for header filesCMake can find one Boost header file but not another
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CMake CHECK_FUNCTION_EXISTS for a function requiring #define
What does “#define _GNU_SOURCE” imply?Symbol lookup in CMake fails although symbol is presentcmake and libpthreadWhat is CMake equivalent of 'configure --prefix=DIR && make all install '?Debug vs Release in CMakeDefine preprocessor macro through cmakeLooking for a 'cmake clean' command to clear up CMake outputCMake : <pthread.h> not found in WindowsCMake install is not installing libraries on Windowscmake try_compile: Using library found in configurecmake using corrext c++ standard when checking for header filesCMake can find one Boost header file but not another
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
I a CMake project, I am trying to test for availability of pthread_setname_np(). As for the headers, this function prototype only seems to be exposed if I #define _GNU_SOURCE first.
Probably for this reason, simply doing
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
will not detect the function even though it is present. The documentation mentions CMAKE_REQUIRED_DEFINITIONS but I am not sure how to use it (nor if it is the right way at all).
How can I get CMake to correctly detect the presence of this function?
cmake pthreads
asked Mar 23 at 18:37
user149408user149408
2,2721129
add a comment |
I a CMake project, I am trying to test for availability of pthread_setname_np(). As for the headers, this function prototype only seems to be exposed if I #define _GNU_SOURCE first.
Probably for this reason, simply doing
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
will not detect the function even though it is present. The documentation mentions CMAKE_REQUIRED_DEFINITIONS but I am not sure how to use it (nor if it is the right way at all).
How can I get CMake to correctly detect the presence of this function?
cmake pthreads
asked Mar 23 at 18:37
user149408user149408
2,2721129
add a comment |
I a CMake project, I am trying to test for availability of pthread_setname_np(). As for the headers, this function prototype only seems to be exposed if I #define _GNU_SOURCE first.
Probably for this reason, simply doing
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
will not detect the function even though it is present. The documentation mentions CMAKE_REQUIRED_DEFINITIONS but I am not sure how to use it (nor if it is the right way at all).
How can I get CMake to correctly detect the presence of this function?
cmake pthreads
asked Mar 23 at 18:37
user149408user149408
2,2721129
I a CMake project, I am trying to test for availability of pthread_setname_np(). As for the headers, this function prototype only seems to be exposed if I #define _GNU_SOURCE first.
Probably for this reason, simply doing
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
will not detect the function even though it is present. The documentation mentions CMAKE_REQUIRED_DEFINITIONS but I am not sure how to use it (nor if it is the right way at all).
How can I get CMake to correctly detect the presence of this function?
cmake pthreads
cmake pthreads
asked Mar 23 at 18:37
user149408user149408
2,2721129
asked Mar 23 at 18:37
user149408user149408
2,2721129
asked Mar 23 at 18:37
user149408user149408
2,2721129
asked Mar 23 at 18:37
user149408user149408
2,2721129
asked Mar 23 at 18:37
user149408user149408
2,2721129
2,2721129
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Yes, CMAKE_REQUIRED_DEFINITIONS is a correct way to test for this function. Here's an example of its use:
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
unset(CMAKE_REQUIRED_DEFINITIONS)
You also probably want to read this: What does “#define _GNU_SOURCE” imply?
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
Thanks, you’re getting an upvote for this. Alas, it still doesn’t work—CMake does not find the function, despite it being defined in the header file. Could that have to do with the need to define_GNU_SOURCEbefore including the header (as an answer to your linked question points out)?
– user149408
Mar 25 at 12:06
That's right - you have to define_GNU_SOURCEin both cases: when you testing forpthread_setname_npfunction and when you're using it within your code. Instead of defining it before including the header, you can also doadd_definitions(-D_GNU_SOURCE)in CMakeLists.txt
– arrowd
Mar 25 at 12:10
CMake still isn’t picking it up andconfig.hdoes not defineHAVE_PTHREAD_SETNAME_NP. Same withadd_definitions, or with the approach described in stackoverflow.com/q/13541788/2703209 (without touchingCMAKE_REQUIRED_LIBRARIESas I don’t think I need any extra here).
– user149408
Mar 25 at 12:24
1
Take a look at logs located somewhere in your build directory. Specifically,CMakeFiles/dir.
– arrowd
Mar 25 at 13:19
Thanks, that provided the hints I needed. Will post a new answer.
– user149408
Mar 25 at 23:05
add a comment |
This eventually worked for me (at least on Ubuntu 18.04, currently running CI for others):
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
list(APPEND CMAKE_REQUIRED_LIBRARIES pthread)
CHECK_SYMBOL_EXISTS(pthread_setname_np pthread.h HAVE_PTHREAD_SETNAME_NP)
list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
Important: make sure you have a clean build environment, with no leftovers from previous builds. For cmake4eclipse, this means:
- Go to Project > Properties > C/C++ Build > CMake and check Force CMake to run with each build. (You can clear that option again after your first successful build.)
- Clean your project.
Appending the pthread library proved necessary for me, otherwise it would not detect the function. The library name seems to be pthreads on some systems (at least I see CMake testing for both); these systems may need further tweaks to detect the function.
CHECK_FUNCTION_EXISTS instead of CHECK_SYMBOL_EXISTS would have worked as well (I have tried both successfully).
answered Mar 25 at 23:36
user149408user149408
2,2721129
add a comment |
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2 Answers
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active
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2 Answers
2
active
oldest
votes
active
oldest
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active
oldest
votes
Yes, CMAKE_REQUIRED_DEFINITIONS is a correct way to test for this function. Here's an example of its use:
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
unset(CMAKE_REQUIRED_DEFINITIONS)
You also probably want to read this: What does “#define _GNU_SOURCE” imply?
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
Thanks, you’re getting an upvote for this. Alas, it still doesn’t work—CMake does not find the function, despite it being defined in the header file. Could that have to do with the need to define_GNU_SOURCEbefore including the header (as an answer to your linked question points out)?
– user149408
Mar 25 at 12:06
That's right - you have to define_GNU_SOURCEin both cases: when you testing forpthread_setname_npfunction and when you're using it within your code. Instead of defining it before including the header, you can also doadd_definitions(-D_GNU_SOURCE)in CMakeLists.txt
– arrowd
Mar 25 at 12:10
CMake still isn’t picking it up andconfig.hdoes not defineHAVE_PTHREAD_SETNAME_NP. Same withadd_definitions, or with the approach described in stackoverflow.com/q/13541788/2703209 (without touchingCMAKE_REQUIRED_LIBRARIESas I don’t think I need any extra here).
– user149408
Mar 25 at 12:24
1
Take a look at logs located somewhere in your build directory. Specifically,CMakeFiles/dir.
– arrowd
Mar 25 at 13:19
Thanks, that provided the hints I needed. Will post a new answer.
– user149408
Mar 25 at 23:05
add a comment |
Yes, CMAKE_REQUIRED_DEFINITIONS is a correct way to test for this function. Here's an example of its use:
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
unset(CMAKE_REQUIRED_DEFINITIONS)
You also probably want to read this: What does “#define _GNU_SOURCE” imply?
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
Thanks, you’re getting an upvote for this. Alas, it still doesn’t work—CMake does not find the function, despite it being defined in the header file. Could that have to do with the need to define_GNU_SOURCEbefore including the header (as an answer to your linked question points out)?
– user149408
Mar 25 at 12:06
That's right - you have to define_GNU_SOURCEin both cases: when you testing forpthread_setname_npfunction and when you're using it within your code. Instead of defining it before including the header, you can also doadd_definitions(-D_GNU_SOURCE)in CMakeLists.txt
– arrowd
Mar 25 at 12:10
CMake still isn’t picking it up andconfig.hdoes not defineHAVE_PTHREAD_SETNAME_NP. Same withadd_definitions, or with the approach described in stackoverflow.com/q/13541788/2703209 (without touchingCMAKE_REQUIRED_LIBRARIESas I don’t think I need any extra here).
– user149408
Mar 25 at 12:24
1
Take a look at logs located somewhere in your build directory. Specifically,CMakeFiles/dir.
– arrowd
Mar 25 at 13:19
Thanks, that provided the hints I needed. Will post a new answer.
– user149408
Mar 25 at 23:05
add a comment |
Yes, CMAKE_REQUIRED_DEFINITIONS is a correct way to test for this function. Here's an example of its use:
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
unset(CMAKE_REQUIRED_DEFINITIONS)
You also probably want to read this: What does “#define _GNU_SOURCE” imply?
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
Yes, CMAKE_REQUIRED_DEFINITIONS is a correct way to test for this function. Here's an example of its use:
set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
CHECK_FUNCTION_EXISTS(pthread_setname_np HAVE_PTHREAD_SETNAME_NP)
unset(CMAKE_REQUIRED_DEFINITIONS)
You also probably want to read this: What does “#define _GNU_SOURCE” imply?
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
answered Mar 24 at 4:19
arrowdarrowd
23.3k45684
23.3k45684
Thanks, you’re getting an upvote for this. Alas, it still doesn’t work—CMake does not find the function, despite it being defined in the header file. Could that have to do with the need to define_GNU_SOURCEbefore including the header (as an answer to your linked question points out)?
– user149408
Mar 25 at 12:06
That's right - you have to define_GNU_SOURCEin both cases: when you testing forpthread_setname_npfunction and when you're using it within your code. Instead of defining it before including the header, you can also doadd_definitions(-D_GNU_SOURCE)in CMakeLists.txt
– arrowd
Mar 25 at 12:10
CMake still isn’t picking it up andconfig.hdoes not defineHAVE_PTHREAD_SETNAME_NP. Same withadd_definitions, or with the approach described in stackoverflow.com/q/13541788/2703209 (without touchingCMAKE_REQUIRED_LIBRARIESas I don’t think I need any extra here).
– user149408
Mar 25 at 12:24
1
Take a look at logs located somewhere in your build directory. Specifically,CMakeFiles/dir.
– arrowd
Mar 25 at 13:19
Thanks, that provided the hints I needed. Will post a new answer.
– user149408
Mar 25 at 23:05
add a comment |
Thanks, you’re getting an upvote for this. Alas, it still doesn’t work—CMake does not find the function, despite it being defined in the header file. Could that have to do with the need to define_GNU_SOURCEbefore including the header (as an answer to your linked question points out)?
– user149408
Mar 25 at 12:06
That's right - you have to define_GNU_SOURCEin both cases: when you testing forpthread_setname_npfunction and when you're using it within your code. Instead of defining it before including the header, you can also doadd_definitions(-D_GNU_SOURCE)in CMakeLists.txt
– arrowd
Mar 25 at 12:10
CMake still isn’t picking it up andconfig.hdoes not defineHAVE_PTHREAD_SETNAME_NP. Same withadd_definitions, or with the approach described in stackoverflow.com/q/13541788/2703209 (without touchingCMAKE_REQUIRED_LIBRARIESas I don’t think I need any extra here).
– user149408
Mar 25 at 12:24
1
Take a look at logs located somewhere in your build directory. Specifically,CMakeFiles/dir.
– arrowd
Mar 25 at 13:19
Thanks, that provided the hints I needed. Will post a new answer.
– user149408
Mar 25 at 23:05
Thanks, you’re getting an upvote for this. Alas, it still doesn’t work—CMake does not find the function, despite it being defined in the header file. Could that have to do with the need to define
_GNU_SOURCE before including the header (as an answer to your linked question points out)?– user149408
Mar 25 at 12:06
Thanks, you’re getting an upvote for this. Alas, it still doesn’t work—CMake does not find the function, despite it being defined in the header file. Could that have to do with the need to define
_GNU_SOURCE before including the header (as an answer to your linked question points out)?– user149408
Mar 25 at 12:06
That's right - you have to define
_GNU_SOURCE in both cases: when you testing for pthread_setname_np function and when you're using it within your code. Instead of defining it before including the header, you can also do add_definitions(-D_GNU_SOURCE) in CMakeLists.txt– arrowd
Mar 25 at 12:10
That's right - you have to define
_GNU_SOURCE in both cases: when you testing for pthread_setname_np function and when you're using it within your code. Instead of defining it before including the header, you can also do add_definitions(-D_GNU_SOURCE) in CMakeLists.txt– arrowd
Mar 25 at 12:10
CMake still isn’t picking it up and
config.h does not define HAVE_PTHREAD_SETNAME_NP. Same with add_definitions, or with the approach described in stackoverflow.com/q/13541788/2703209 (without touching CMAKE_REQUIRED_LIBRARIES as I don’t think I need any extra here).– user149408
Mar 25 at 12:24
CMake still isn’t picking it up and
config.h does not define HAVE_PTHREAD_SETNAME_NP. Same with add_definitions, or with the approach described in stackoverflow.com/q/13541788/2703209 (without touching CMAKE_REQUIRED_LIBRARIES as I don’t think I need any extra here).– user149408
Mar 25 at 12:24
1
1
Take a look at logs located somewhere in your build directory. Specifically,
CMakeFiles/ dir.– arrowd
Mar 25 at 13:19
Take a look at logs located somewhere in your build directory. Specifically,
CMakeFiles/ dir.– arrowd
Mar 25 at 13:19
Thanks, that provided the hints I needed. Will post a new answer.
– user149408
Mar 25 at 23:05
Thanks, that provided the hints I needed. Will post a new answer.
– user149408
Mar 25 at 23:05
add a comment |
This eventually worked for me (at least on Ubuntu 18.04, currently running CI for others):
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
list(APPEND CMAKE_REQUIRED_LIBRARIES pthread)
CHECK_SYMBOL_EXISTS(pthread_setname_np pthread.h HAVE_PTHREAD_SETNAME_NP)
list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
Important: make sure you have a clean build environment, with no leftovers from previous builds. For cmake4eclipse, this means:
- Go to Project > Properties > C/C++ Build > CMake and check Force CMake to run with each build. (You can clear that option again after your first successful build.)
- Clean your project.
Appending the pthread library proved necessary for me, otherwise it would not detect the function. The library name seems to be pthreads on some systems (at least I see CMake testing for both); these systems may need further tweaks to detect the function.
CHECK_FUNCTION_EXISTS instead of CHECK_SYMBOL_EXISTS would have worked as well (I have tried both successfully).
answered Mar 25 at 23:36
user149408user149408
2,2721129
add a comment |
This eventually worked for me (at least on Ubuntu 18.04, currently running CI for others):
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
list(APPEND CMAKE_REQUIRED_LIBRARIES pthread)
CHECK_SYMBOL_EXISTS(pthread_setname_np pthread.h HAVE_PTHREAD_SETNAME_NP)
list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
Important: make sure you have a clean build environment, with no leftovers from previous builds. For cmake4eclipse, this means:
- Go to Project > Properties > C/C++ Build > CMake and check Force CMake to run with each build. (You can clear that option again after your first successful build.)
- Clean your project.
Appending the pthread library proved necessary for me, otherwise it would not detect the function. The library name seems to be pthreads on some systems (at least I see CMake testing for both); these systems may need further tweaks to detect the function.
CHECK_FUNCTION_EXISTS instead of CHECK_SYMBOL_EXISTS would have worked as well (I have tried both successfully).
answered Mar 25 at 23:36
user149408user149408
2,2721129
add a comment |
This eventually worked for me (at least on Ubuntu 18.04, currently running CI for others):
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
list(APPEND CMAKE_REQUIRED_LIBRARIES pthread)
CHECK_SYMBOL_EXISTS(pthread_setname_np pthread.h HAVE_PTHREAD_SETNAME_NP)
list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
Important: make sure you have a clean build environment, with no leftovers from previous builds. For cmake4eclipse, this means:
- Go to Project > Properties > C/C++ Build > CMake and check Force CMake to run with each build. (You can clear that option again after your first successful build.)
- Clean your project.
Appending the pthread library proved necessary for me, otherwise it would not detect the function. The library name seems to be pthreads on some systems (at least I see CMake testing for both); these systems may need further tweaks to detect the function.
CHECK_FUNCTION_EXISTS instead of CHECK_SYMBOL_EXISTS would have worked as well (I have tried both successfully).
answered Mar 25 at 23:36
user149408user149408
2,2721129
This eventually worked for me (at least on Ubuntu 18.04, currently running CI for others):
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
list(APPEND CMAKE_REQUIRED_LIBRARIES pthread)
CHECK_SYMBOL_EXISTS(pthread_setname_np pthread.h HAVE_PTHREAD_SETNAME_NP)
list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
Important: make sure you have a clean build environment, with no leftovers from previous builds. For cmake4eclipse, this means:
- Go to Project > Properties > C/C++ Build > CMake and check Force CMake to run with each build. (You can clear that option again after your first successful build.)
- Clean your project.
Appending the pthread library proved necessary for me, otherwise it would not detect the function. The library name seems to be pthreads on some systems (at least I see CMake testing for both); these systems may need further tweaks to detect the function.
CHECK_FUNCTION_EXISTS instead of CHECK_SYMBOL_EXISTS would have worked as well (I have tried both successfully).
answered Mar 25 at 23:36
user149408user149408
2,2721129
answered Mar 25 at 23:36
user149408user149408
2,2721129
answered Mar 25 at 23:36
user149408user149408
2,2721129
answered Mar 25 at 23:36
user149408user149408
2,2721129
2,2721129
add a comment |
add a comment |
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