I am new to Ubuntu and I had the following questions.
When compiling a C or any other program one often writes a command such as gcc hello.c -lm
I am told the -lm option is for explicitly linking the math library during the compiling
phase. I wanted to know where the library 'foo' is supposed to be located if linked with - lfoo.
This is an error I get when I was trying to install a package named SUPERLU which in turn depends on the existence of a package named PARMETIS. (ending of the stuff after running make)
/usr/bin/ld: cannot find -lparmetis
collect2: ld returned 1 exit status
make[1]: * [pddrive] Error 1
make[1]: Leaving directory `/home/gaurish108/Desktop/ResearchMeetings/SUPERPETS/SuperLU_DIST_2.4/EXAMPLE'
make: * [example] Error 2
What should I do ???? I found that there is no ld folder in my /usr/bin/......Should I modify my make.inc file in some way?
Take a look here: http://www.network-theory.co.uk/docs/gccintro/gccintro_21.html. -lm says "search for libm.a in the search path". libm.a is found in /usr/lib/libm.a.
Related
I get the following error while compiling xpdf using make. I've tried using the command:
LIBS=-lm make
However, it doesn't work. I know the problem is that the c compiler cannot recognise the math symbols in the source code because the math library is not available to it, but I don't know how to fix it.
[ 71%] Linking CXX executable pdftohtml
/usr/bin/ld: CMakeFiles/xpdf_objs.dir/Gfx.cc.o: undefined reference to symbol 'acos##GLIBC_2.2.5'
//usr/lib64/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [xpdf/CMakeFiles/pdftohtml.dir/build.make:219: xpdf/pdftohtml] Error 1
make[1]: *** [CMakeFiles/Makefile2:428: xpdf/CMakeFiles/pdftohtml.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
I have put my Makefile and makeLists.txt on pastebin for more information
I realised I had to use the g++ compiler instead of gcc after reading the man page for gcc which stated:
The usual way to run GCC is to run the executable called gcc, or
machine-gcc when cross-compiling, or machine-gcc-version to run a
specific
version of GCC. When you compile C++ programs, you should invoke GCC as g++ instead.
I need to link a shared library (LuaSocket) I'm compiling against another special shared library, liblua5.1, that isn't in one of the normal locations. To do this I'm modifying the Makefile.
I cannot figure out what I'm doing wrong, but this particular step that I modified fails:
LIBRARY_PATH=/media/sda2/crank/lib gcc -O -shared -fpic -l liblua5.1 -o socket.so.2.0.2 [...]
(where [...] is a list of .o files that just got built). When I build, I get the error
/usr/lib/gcc/arm-poky-linux-gnueabi/4.8.1/../../../../arm-poky-linux-gnueabi/bin/ld: cannot find -lliblua5.1
collect2: error: ld returned 1 exit status
make: *** [socket.so.2.0.2] Error 1
Inspection of the LIBRARY_PATH confirms that the needed library is there:
# ls /media/sda2/crank/lib/
lgre.so libgre.so libgreio.a liblua.so liblua5.1.so libsbexternal.so
What am I doing wrong?
Change -l liblua5.1 to -llua5.1.
Also, instead of setting LIBRARY_PATH, why not use the -L option? Example: -L/media/sda2/crank/lib.
I am attempting to compile a C program with multiple files on window platform. However, when I make it, errors are occurred. I have already tried to modify command in makefile but still could not fix it.
This is my GCC command:
gcc -o "SYSMONTR" $(OBJPATH)/chkdsksp ../chkdsksp.c -g -I"$(DB2PATH)/include" -I"$(MYLIBDIR)" $(MYIQDIR)/iqclilib.a $(OBJPATH)/icrou.a -lc -ldb2 -lnsl -L"$(DB2PATH)/lib"
This is result:
gcc -o "SYSMONTR" ../../iLINKOBJ/chkdsksp ../chkdsksp.c -g -I"C:/Program Files/IBM/SQLLIB/include" -I"../../iLINKCLIB" ../../iLINKIQOBJ/iqclilib.a ../../iLINKOBJ/icrou.a -lc -ldb2 -lnsl -L"C:/Program Files/IBM/SQLLIB/lib"
../../iLINKOBJ/chkdsksp: file not recognized: File format not recognized
collect2: error: ld returned 1 exit status
makefile:49: recipe for target `SYSMONTR' failed
make: *** [SYSMONTR] Error 1
What could cause such error and what should I do with it? Using cygwin on Window (IDE: Eclipse).
Any supports will be appreciated.
If chkdsksp is an object file built by another team to run on AIX, you cannot expect it to function -- or even be recognized by your compiler -- on Cygwin. You must contact that team and get a) the source code or b) a version of the object file compiled for your platform (and tested).
I'm totally new to cmake. After an svn update (but also to binutils and I suspect this is causing the problem), I get an error (I successfully compiled and used the program before)
Linking CXX executable gmsh
/usr/bin/ld: /usr/local/lib/liblapack.a(dgesvd.o): undefined reference to symbol '_gfortran_concat_string##GFORTRAN_1.0'
/usr/bin/ld: note: '_gfortran_concat_string##GFORTRAN_1.0' is defined in DSO /usr/lib/libgfortran.so.3 so try adding it to the linker command line
/usr/lib/libgfortran.so.3: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make[2]: *** [gmsh] Error 1
make[1]: *** [CMakeFiles/gmsh.dir/all] Error 2
make: *** [all] Error 2
Maybe it's related to this Fedoraproject DSO Change?
I have an up-to-date archlinux (binutils-2.23-1).
I tried to edit lines in the ccmake . menu. After hitting [c] the original options are restored (so I cannot add /usr/lib/libgfortran.so.3 to the GMSH_EXTERNAL_LIBRARIES variable in order [g] generate the new Makefiles).
I also tried adding some options which were recommended in the cmake irc chat, but it eventually didn't work.
cmake . -DCMAKE_LINK_FLAGS=-Wl,--add-needed
or
cmake . -DCMAKE_LINK_FLAGS=-lgfortran
Resulting in the same error. What can I do?
Additional information: make VERBOSE=1 pastebin link
To add a library to the link command, you can use target_link_libraries. Apparently in this case you want:
target_link_libraries(gmsh ${LINK_LIBRARIES} gfortran)
I am trying to cross compile samba server.
./config works just fine, but when I want to build with make the prompt says:
Linking shared library bin/libsmbclient.so.0
/opt/qnx630/host/linux/x86/usr/bin/ntoarm-ld: cannot find -lpthread
collect2: ld returned 1 exit status
make: *** [bin/libsmbclient.so.0] Error 1
Anyone knows a solution?
had this same problem w/mingw. got libpthreadGC2.a from ftp://sourceware.org/pub/pthreads-win32/dll-latest/lib/x86/, put it in C;\mingw\lib and renamed it to libpthread.a. i didn't know gcc's -l switch means "apprend 'lib' to the front and '.a' to the back" e.g. -lpthread = libpthread.a
Make sure that the pthread library is in the library search path of the linker.