Lee Rhodes wrote:
Hello,
I have installed the GSL libs via setup and am trying to get the following
example program to work:
#include <stdio.h>
#include <gsl/gsl_sf_bessel.h>
int main (void)
{
double x = 5.0;
double y = gsl_sf_bessel_J0 (x);
printf ("J0(%g) = %.18e\n", x, y);
return 0;
}
The compiler/linker is able to locate the header ok, but the error message I
get on the line that calls the function is:
undefined reference to `_gsl_sf_bessel_J0'
Somehow the function name got mangled with an added underscore, and of
course, it doesn't exist.
It compiles and links fine for me using "gcc t.cpp -lgsl". Are you sure
you are putting -lgsl in the right place on the command line (ie, at the
end)? If you are, try compiling with "gcc -v -v t.cpp -lgsl", here is
that output for me:
$ gcc t.cpp -v -v -lgsl
Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs
Configured with:
/usr/build/package/orig/test.respin/gcc-3.4.4-3/configure --verbose
--prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls
--without-included-gettext --enable-version-specific-runtime-libs
--without-x --enable-libgcj --disable-java-awt --with-system-zlib
--enable-interpreter --disable-libgcj-debug --enable-threads=posix
--enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions
--enable-hash-synchronization --enable-libstdcxx-debug
Thread model: posix
gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
/usr/lib/gcc/i686-pc-cygwin/3.4.4/cc1plus.exe -quiet -v -v
-D__CYGWIN32__ -D__CYGWIN__ -Dunix -D__unix__ -D__unix -idirafter
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api -idirafter
/usr/local/lib/../../include/w32api t.cpp -quiet -dumpbase t.cpp
-mtune=pentiumpro -auxbase t -version -o
/cygdrive/c/DOCUME~1/Lewis/LOCALS~1/Temp/cc1w4jdk.s
ignoring nonexistent directory
"/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/include"
ignoring duplicate directory "/usr/local/lib/../../include/w32api"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/i686-pc-cygwin
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/backward
/usr/local/include
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include
/usr/include
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api
End of search list.
GNU C++ version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
(i686-pc-cygwin)
compiled by GNU C version 3.4.4 (cygming special, gdc 0.12,
using dmd 0.125).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
t.cpp:10:7: warning: no newline at end of file
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/bin/as.exe
-o /cygdrive/c/DOCUME~1/Lewis/LOCALS~1/Temp/ccGPvaYJ.o
/cygdrive/c/DOCUME~1/Lewis/LOCALS~1/Temp/cc1w4jdk.s
/usr/lib/gcc/i686-pc-cygwin/3.4.4/collect2.exe -Bdynamic
--dll-search-prefix=cyg
/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../crt0.o -L/usr/local/lib
-L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -L/usr/lib/gcc/i686-pc-cygwin/3.4.4
-L/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../..
/cygdrive/c/DOCUME~1/Lewis/LOCALS~1/Temp/ccGPvaYJ.o -lgsl -lgcc -lcygwin
-luser32 -lkernel32 -ladvapi32 -lshell32 -lgcc
It also works fine with g++ for me.
-Lewis
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