[mercury-users] Using not installed libraries

[Peter Moulder]

The following is in the instructions for the mercury_tcltk library.
What it achieves is that I can compile and run a program using
libmercury_tcltk without having libmercury_tcltk installed in the usual
library directories.  Not sure if that's what you're after.

  TCLTK_MLLIBS = <libraries that libmercury_tcltk links against>

  # Specify the location of the `mercury_tcltk' package.
  MERCURY_TCLTK_DIR  = some/directory/mercury_tcltk

  # Tell mmake to use the `mercury_tcltk' library.
  VPATH           = $(MERCURY_TCLTK_DIR):$(MMAKE_VPATH)
  MCFLAGS         = -I$(MERCURY_TCLTK_DIR) $(EXTRA_MCFLAGS)
  MLFLAGS         = -R$(MERCURY_TCLTK_DIR) $(EXTRA_MLFLAGS) \
		    -L$(MERCURY_TCLTK_DIR) 
  MLLIBS          = -lmercury_tcltk $(TCLTK_MLLIBS) $(EXTRA_MLLIBS)
  C2INITFLAGS     = $(MERCURY_TCLTK_DIR)/mercury_tcltk.init 

I believe it also needs the following:

  MGNUCFLAGS      += -I$(MERCURY_TCLTK_DIR)

[In the specific case of libmercury_tcltk, which uses pragma c_header_code,
 I also need `-I/usr/include/tcl8.3' in MGNUCFLAGS.]


Incidentally, comments in libtool documentation (from memory) suggest
that you shouldn't distribute binaries compiled with such custom -R
switches, on the grounds that it's a security problem if an attacker can
write to a directory with the same name.

pjm.
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