Martin Costabel wrote:
Daniel Macks wrote: []
I wonder if when linking against that .dylib the linker is picking /sw/lib/libnetpbm.dylib instead of the one just compiled as part of the nascent package?
I don't think this happens in this case. The package goes to some lengths to avoid this, -isystem and such. The actual linker line where the undefined symbol appeared was
> cc -no-cpp-precomp -L/sw/lib -o pnmtopng pnmtopng.o pngtxt.o \ > `/sw/src/netpbm10-10.24-1/netpbm-10.24/buildtools/libopt > /sw/src/netpbm10-10.24-1/netpbm-10.24/lib/libnetpbm.dylib libpng.dylib > libz.dylib` \ > -lm -L/sw/lib > libopt results: ' -L/sw/src/netpbm10-10.24-1/netpbm-10.24/lib -lnetpbm > -lpng -lz' > ld: warning prebinding disabled because of undefined symbols > ld: Undefined symbols: > _pm_seek2 > _pm_tell2
So the good library was there with its full name. The only thing that puzzles me there (apart from the missing symbols that I am not able to reproduce) is the "libopt results:" line. I don't know who is talking there.
OK, after looking what libopt does and rereading that linker line, I see now that it is actually possible that the wrong library got picked, because the real linker line (which is not shown) would have been
> cc -no-cpp-precomp -L/sw/lib -o pnmtopng pnmtopng.o pngtxt.o \ > -L/sw/src/netpbm10-10.24-1/netpbm-10.24/lib -lnetpbm -lpng -lz \ > -lm -L/sw/lib
and so, despite all the efforts, the -lnetpbm will pick up the library in /sw/lib.
This libopt stuff is actually more harmful than useful. On darwin, it is superfluous, because we have the install_names. It is a replacement of the install_names construction for those systems where the path that gets hardcoded into the executable is taken from the linker line.
-- Martin
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