From: Henrik.Carlqvist@deadspam.com   
      
   On Tue, 07 May 2024 02:58:24 +0000, root wrote:   
   > magic:magic.o eigen.o fft.o order.o xplot.o best.o minv.o utils.o   
   > xtfuncs.o mygetline.o mymouse.o   
   >     gcc -o/root/bin/magic -Xlinker -Map=/ram/MAP.map   -lm   
   >     -L/usr/lib64/gsl -lgsl -lgslcblas -rdynamic -ldl -lgpm \   
   >     magic.o eigen.o fft.o order.o xplot.o minv.o  best.o utils.o   
   >     xtfuncs.o mygetline.o mymouse.o   
      
   The above is the linking step where your executable magic is linked by a   
   number of object files and some standard system libraries.   
      
   > The problem is that the math libraries have all be renamed, or something   
   > else and none of the math functions compile. I get unresolved errors for   
   > all the math functions log,exp,sin,cos..... as well as anything using   
   > the Gnu math libraries.   
      
   As you say, sin, cos and other functions are expected to be in libm which   
   you should get linked with the switch -lm.   
      
   Are you sure that cos is missing from your standard math library? You   
   could check with a command like:   
      
   nm /usr/lib*/libm.so | grep " cos"   
      
   If you find cos in the library, my guess instead is that your command   
   line has failed. Could it be that the switch "-Map=/ram/MAP.map" somehow   
   hides the switch "-lm"?   
      
   Another problem which I have seen during the years is that some linkers   
   might be picky about the order of object files and libraries. They   
   require that object files and libraries come after object files and   
   libraries which call their functions. In your example you have all your   
   libraries before your object files, if you have such a linker those   
   object files will not find their functions in the libraries. If you don't   
   want to work out which files calls stuff in other files, one quick   
   workaround for such a situation would be to give all files twice:   
      
   gcc -o/root/bin/magic -Xlinker -Map=/ram/MAP.map  \   
       -lm -L/usr/lib64/gsl -lgsl -lgslcblas -rdynamic -ldl -lgpm \   
       magic.o eigen.o fft.o order.o xplot.o minv.o  best.o utils.o \   
       xtfuncs.o mygetline.o mymouse.o \   
       -lm -L/usr/lib64/gsl -lgsl -lgslcblas -rdynamic -ldl -lgpm \   
       magic.o eigen.o fft.o order.o xplot.o minv.o  best.o utils.o \   
       xtfuncs.o mygetline.o mymouse.o   
      
   regards Henrik   
      
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