Error memset was not declared in this scope

I tried to compile version 2.2.1 on Arch Linux and during the make command, I ran into these errors:

g++ -c -pipe -std=c++11 -O2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -std=gnu++11 -Wall -W -fPIC -DLIBKEYFINDER_LIBRARY -I. -isystem /usr/local/include -I/usr/lib/qt/mkspecs/linux-g++ -o fftadapter.o fftadapter.cpp
fftadapter.cpp: In constructor ‘KeyFinder::FftAdapter::FftAdapter(unsigned int)’:
fftadapter.cpp:43:5: error: ‘memset’ was not declared in this scope
     memset(priv->outputComplex, 0, sizeof(fftw_complex) * frameSize);
     ^~~~~~
fftadapter.cpp:43:5: note: suggested alternative: ‘wmemset’
     memset(priv->outputComplex, 0, sizeof(fftw_complex) * frameSize);
     ^~~~~~
     wmemset
make: *** [Makefile:546: fftadapter.o] Error 1

I tried changing the variables with /usr/local/ at the beginning of the Makefile to /usr/ and I encountered error finding math.h:

g++ -c -pipe -std=c++11 -O2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -std=gnu++11 -Wall -W -fPIC -DLIBKEYFINDER_LIBRARY -I. -isystem /usr/include -I/usr/lib/qt/mkspecs/linux-g++ -o fftadapter.o fftadapter.cpp
In file included from constants.h:25:0,
                 from fftadapter.h:25,
                 from fftadapter.cpp:22:
/usr/include/c++/7.2.1/cmath:45:15: fatal error: math.h: No such file or directory
 #include_next <math.h>
               ^~~~~~~~
compilation terminated.
make: *** [Makefile:546: fftadapter.o] Error 1

Technical Problem Cluster First Answered On
June 5, 2020

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1. error: ‘memset’ in not declared in this scope
   

   ‘memset’ is not declared in this scope.

   anyone knows why is this error??

   thanks

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2. Re: error: ‘memset’ in not declared in this scope
   

   a little information on what youre doing when you get that error would probably help.

   ---

3. Re: error: ‘memset’ in not declared in this scope
   

   i’m doing the «make». it is a c/s application using multicast DNS

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4. Re: error: ‘memset’ in not declared in this scope
   

   if you can post the code and the entire error message i can look at it for you.

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5. Re: error: ‘memset’ in not declared in this scope
   

   her is the error:

   void mDNSObserver::run() {
   int nbytes,addrlen;
   char msgbuf[MSGBUFSIZE];
   cout << «mDNSObserver: running» << endl;
   memset(msgbuf,0,sizeof(msgbuf));
   // Now just enter a read-print loop.
   while (this->keepRunning) {
   …

   i get 2 more and the codes are similar:

   mDNSObserver::mDNSObserver(mNameServer* c): client(c), keepRunning(true) {
   struct ip_mreq mreq;
   u_int yes=1;
   // Set up multicast group destination address for receiving.
   if ((fd4Receiving=socket(AF_INET,SOCK_DGRAM,0)) < 0) {
   cerr << «Problems creating receiving multicast socket» << endl;
   exit(1);
   }
   // Trick just to allow multiple sockets to use the same PORT number: Only to try several processes in the same machine.
   if (setsockopt(fd4Receiving,SOL_SOCKET,SO_REUSEADDR,& yes,sizeof(yes)) < 0) {
   cerr << «Problems: Reusing ADDR failed» << endl;
   exit(1);
   }
   // Set up destination address.
   memset(&addr,0,sizeof(addr));
   addr.sin_family=AF_INET;
   addr.sin_addr.s_addr=htonl(INADDR_ANY); /* N.B.: differs from sender */
   addr.sin_port=htons(MDNS_PORT);
   ….

   and the last

   mDNSQueryWrapper::mDNSQueryWrapper(mNameServer* c): client(c) {
   // Setup the mDNSClient multicast socket. Something similar to an UDP standard socket.
   // Once configured, you only need to call queryWrapper->send(string str) method.
   if ((fd4Sending=socket(AF_INET,SOCK_DGRAM,0)) < 0) {
   cerr << «Problems creating sending multicast socket» << endl;
   exit(1);
   }
   // Set up multicast group destination address for sending. (It’s the same than UDP datagram sending, with an special destination address.)
   memset(&addr,0,sizeof(addr));
   addr.sin_family=AF_INET;
   addr.sin_addr.s_addr=inet_addr(MDNS_GROUP);
   addr.sin_port=htons(MDNS_PORT);
   }

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6. Re: error: ‘memset’ in not declared in this scope
   

   use code tags.
   and where are the error messages?

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7. Re: error: ‘memset’ in not declared in this scope
   

   Ok.solved. thanks, but sorry for wasting your time because it was string.h missing lib hehe

   it doens’t hours… hehe

   thxs

   ---

Posted By: Anonymous

I am trying to compile my C program in Ubuntu 9.10 (gcc 4.4.1).

I am getting this error:

Rect.cpp:344: error: ‘memset’ was not declared in this scope

But the problem is I have already included in my cpp file:

#include <stdio.h>
#include <stdlib.h>

And the same program compiles fine under Ubuntu 8.04 (gcc 4.2.4).

Please tell me what am I missing.

Solution

You should include <string.h> (or its C++ equivalent, <cstring>).

Answered By: Anonymous

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