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+
+#  N.B. the previous line should be blank.
+#++
+#  Name:
+#     ast_link_adam
+
+#  Purpose:
+#     Link an ADAM program with the AST library.
+
+#  Type of Module:
+#     Shell script.
+
+#  Description:
+#     This command should only be used when building Starlink ADAM programs
+#     which use the AST library, in order to generate the correct arguments
+#     to allow the ADAM ``alink'' command to link the program. The arguments
+#     generated are written to standard output but may be substituted into
+#     the ``alink'' command line in the standard UNIX way using backward
+#     quotes (see below).
+#
+#     By default, it is assumed that you are building an ADAM program which
+#     does not produce graphical output. However, switches are provided for
+#     linking other types of program. This command should not be used when
+#     building stand-alone (non-ADAM) programs. Use the ``ast_link'' command
+#     instead.
+
+#  Invocation:
+#c     alink program.o -L/star/lib `ast_link_adam [switches]`
+#f     alink program.f -L/star/lib `ast_link_adam [switches]`
+
+#  Switches:
+#     The following switches may optionally be given to this command to
+#     modify its behaviour:
+#
+#     - ``-csla'': Ignored. Provided for backward compatibility only.
+#
+#     - ``-fsla'': Ignored. Provided for backward compatibility only.
+#
+#     - ``-grf'': Requests that no arguments be generated to specify which
+#     2D graphics system is used to display output from the AST library. You
+#     should use this option only if you have implemented an interface to a
+#     new graphics system yourself and wish to provide your own arguments for
+#     linking with it. This switch differs from the other ``grf'' switches in
+#     that it assumes that your graphics module implements the complete
+#     interface required by the current version of AST. If future versions of
+#     AST introduce new functions to the graphics interface, this switch will
+#     cause ``unresolved symbol'' errors to occur during linking, warning you
+#     that you need to implement new functions in your graphics module. To
+#     avoid such errors, you can use one of the other, version-specific,
+#     switches in place of the ``-grf'' switch, but these will cause run-time
+#     errors to be reported if any AST function is invoked which requires
+#     facilities not in the implemented interface.
+#
+#     - ``-grf_v2.0'': This switch is equivalent to the ``-mygrf'' switch.
+#     It indicates that you want to link with your own graphics module which
+#     implements the 2D graphics interface required by V2.0 of AST.
+#
+#     - ``-grf_v3.2'': Indicates that you want to link with your own graphics
+#     module which implements the 2D graphics interface required by V3.2 of AST.
+#
+#     - ``-grf_v5.6'': Indicates that you want to link with your own graphics
+#     module which implements the 2D graphics interface required by V5.6 of AST.
+#
+#     - ``-myerr'': Requests that no arguments be generated to specify how
+#     error messages produced by the AST library should be delivered. You
+#     should use this option only if you have implemented an interface to a
+#     new error delivery system yourself and wish to provide your own
+#     arguments for linking with it. By default, error messages are delivered
+#     in the standard ADAM way via the EMS Error Message Service (Starlink
+#     System Note SSN/4).
+#
+#     - ``-mygrf'': This switch has been superceeded by the ``-grf'' switch,
+#     but is retained in order to allow applications to be linked with a
+#     graphics module which implements the interface used by AST V2.0. It is
+#     equivalent to the ``-grf_v2.0'' switch.
+#
+#     - ``-pgp'': Requests that the program be linked so that 2D
+#     graphical output from the AST library is displayed via the
+#     Starlink version of the PGPLOT graphics package (which uses GKS
+#     for its output). By default, no graphics package is linked and
+#     this will result in an error at run time if AST routines are
+#     invoked that attempt to generate graphical output.
+#
+#     - ``-pgplot'': Requests that the program be linked so that 2D
+#     graphical output from the AST library is displayed via the
+#     standard (or ``native'') version of the PGPLOT graphics
+#     package. By default, no graphics package is linked and this will
+#     result in an error at run time if AST routines are invoked that
+#     attempt to generate graphical output.
+#
+#     - ``-grf3d'': Requests that no arguments be generated to specify which
+#     3D graphics system is used to display output from the AST library. You
+#     should use this option only if you have implemented an interface to a
+#     new 3D graphics system yourself and wish to provide your own arguments
+#     for linking with it.
+#
+#     - ``-pgp3d'': Requests that the program be linked so that 3D
+#     graphical output from the AST library is displayed via the
+#     Starlink version of the PGPLOT graphics package (which uses GKS
+#     for its output). By default, no 3D graphics package is linked and
+#     this will result in an error at run time if AST routines are
+#     invoked that attempt to generate graphical output.
+#
+#     - ``-pgplot3d'': Requests that the program be linked so that 3D
+#     graphical output from the AST library is displayed via
+#     the standard (or ``native'') version of the PGPLOT graphics
+#     package. By default, no 3D graphics package is linked and this will
+#     result in an error at run time if AST routines are invoked that
+#     attempt to generate graphical output.
+
+#  SLALIB:
+#     The AST distribution includes a cut down subset of the C version of
+#     the SLALIB library written by Pat Wallace. This subset contains only
+#     the functions needed by the AST library. It is built as part of the
+#     process of building AST and is distributed under GPL (and is thus
+#     compatible with the AST license). Previous version of this script
+#     allowed AST applications to be linked against external SLALIB
+#     libraries (either Fortran or C) rather than the internal version.
+#     The current version of this script does not provide this option,
+#     and always uses the internal SLALIB library. However, for backward
+#     compatibility, this script still allows the "-fsla" and "-csla" flags
+#     (previously used for selecting which version of SLALIB to use) to be
+#     specified, but they will be ignored.
+
+#  Examples:
+#c     alink display.o -L/star/lib `ast_link_adam -pgplot`
+#c        Links an ADAM program ``display'' which uses the standard
+#c        version of PGPLOT for graphical output.
+#c     alink plotit.o -L. -L/star/lib `ast_link_adam -grf` -lgrf
+#c        Links an ADAM program ``plotit'', written in C. The ``-grf''
+#c        switch indicates that graphical output will be delivered through
+#c        a graphical interface which you have implemented yourself, which
+#c        corresponds to the interface required by the current version of AST.
+#c        Here, this interface is supplied by means of the ``-lgrf'' library
+#c        reference.
+#c     alink plotit.o -L. -L/star/lib `ast_link_adam -grf_v2.0` -lgrf
+#c        Links an ADAM program ``plotit'', written in C. The ``-grf_v2.0''
+#c        switch indicates that graphical output will be delivered through
+#c        a graphical interface which you have implemented yourself, which
+#c        corresponds to the interface required by version 2.0 of AST. Here,
+#c        this interface is supplied by means of the ``-lgrf'' library
+#c        reference.
+#f     alink display.f -L/star/lib `ast_link_adam -pgplot`
+#f        Compiles and links an ADAM Fortran program called ``display'' which
+#f        uses the standard version of PGPLOT for graphical output.
+#f     alink plotit.f -L. -L/star/lib `ast_link_adam -grf` -lgrf
+#f        Compiles and links an ADAM Fortran program ``plotit''. The ``-grf''
+#f        switch indicates that graphical output will be delivered through
+#f        a graphical interface which you have implemented yourself, which
+#f        corresponds to the interface required by the current version of AST.
+#f        Here, this interface is supplied by means of the ``-lgrf'' library
+#f        reference.
+#f     alink plotit.f -L. -L/star/lib `ast_link_adam -grf_v2.0` -lgrf
+#f        Compiles and links an ADAM Fortran program ``plotit''. The ``-grf_v2.0''
+#f        switch indicates that graphical output will be delivered through
+#f        a graphical interface which you have implemented yourself, which
+#f        corresponds to the interface required by version 2.0 of AST.
+#f        Here, this interface is supplied by means of the ``-lgrf'' library
+#f        reference.
+
+#  Copyright:
+#     Copyright (C) 1997-2006 Council for the Central Laboratory of the Research Councils
+
+#  Authors:
+#     RFWS: R.F. Warren-Smith (STARLINK)
+#     {enter_new_authors_here}
+
+#  History:
+#     11-NOV-1996 (RFWS):
+#        Original version.
+#     18-NOV-1997 (RFWS):
+#        Adapted prologue for document extraction.
+#     28-SEP-1998 (RFWS):
+#        Distinguish between -pgp and -pgplot options.
+#     23-JAN-2004 (DSB):
+#        Added switches to support older grf implementations.
+#     21-APR-2005 (DSB):
+#        Added "-fsla" option.
+#     16-JUN-2006 (DSB):
+#        Ignore "-fsla" and "-clsa" options, and always use PAL.
+#     22-AUG-2007 (DSB):
+#        Added "-grf3d", "-pgplot3d" and "-pgp3d" flags.
+#     4-MAR-2011 (DSB):
+#        Added v5.6 grf options.
+#     {enter_changes_here}
+
+#  Bugs:
+#     {note_any_bugs_here}
+
+#--
+
+#  This function searches the directory path specified in PATH, looking for
+#  an executable file which is not a directory. If found, it echos the full
+#  file name to standard output. Otherwise, it outputs nothing.
+      find() { IFS=':'; for d in $PATH; do f="${d:=.}/${1}"
+                  test -x "${f}" -a ! -d "${f}" && echo "${f}" && break
+               done;
+             }
+
+#  Initialise linking options.
+      err=''
+      grf=''
+      grf3d=''
+      sla=''
+
+#  Interpret command line switches.
+#  --------------------------------
+      while :; do
+         case "${1}" in
+
+#  -csla - Previously used to request C version of SLALIB. Now ignored.
+         -csla)
+#            sla='c'
+            shift;;
+
+#  -fsla - Previously used to request Fortran version of SLALIB. Now ignored.
+         -fsla)
+#            sla='f'
+            shift;;
+
+#  -myerr - Requests no error reporting.
+         -myerr)
+            err='my'
+            shift;;
+
+#  -grf - Requests no 2D graphics.
+         -grf)
+            grf='current'
+            shift;;
+
+#  -mygrf - Requests no 2D graphics, except for null implementations of
+#  functions aded to the grf interface after AST V2.0.
+         -mygrf)
+            grf='v2.0'
+            shift;;
+
+#  -grf_v2.0 - Requests no 2D graphics, except for null implementations of
+#  functions aded to the grf interface after AST V2.0.
+         -grf_v2.0)
+            grf='v2.0'
+            shift;;
+
+#  -grf_v3.2 - Requests no 2D graphics, except for null implementations of
+#  functions aded to the grf interface after AST V3.2.
+         -grf_v3.2)
+            grf='v3.2'
+            shift;;
+
+#  -grf_v5.6 - Requests no 2D graphics, except for null implementations of
+#  functions added to the grf interface after AST V5.6.
+         -grf_v5.6)
+            grf='v5.6'
+            shift;;
+
+#  -pgp - Requests 2D graphical output through Starlink PGPLOT.
+         -pgp)
+            grf='pgp'
+            shift;;
+
+#  -pgplot - Requests 2D graphical output through native PGPLOT.
+         -pgplot)
+            grf='pgplot'
+            shift;;
+
+#  -grf3d - Requests no 3D graphics.
+         -grf3d)
+            grf3d='current'
+            shift;;
+
+#  -pgp3d - Requests 3D graphical output through Starlink PGPLOT.
+         -pgp3d)
+            grf3d='pgp'
+            shift;;
+
+#  -pgplot3d - Requests 3D graphical output through native PGPLOT.
+         -pgplot3d)
+            grf3d='pgplot'
+            shift;;
+
+#  Once all switches have been read, continue with the rest of the script.
+         '') break;;
+
+#  Catch unrecognised switches and report an error.
+         *)
+            echo >&2 "ast_link_adam: unknown argument \""${1}"\" given"
+            exit 1;;
+         esac
+      done
+
+#  Link with the main AST library.
+#  -------------------------------
+#  Start forming the list of arguments with the main AST library itself.
+      args='-last'
+
+#  Generate arguments for linking PAL.
+#  -----------------------------------
+
+      case "@EXTERNAL_PAL@" in
+
+#  If we configured --with-external_pal include a link option to pick up
+#  an external PAL library.
+      1) args="${args} -lpal";;
+
+#  Otherwise, use the internal PAL & ERFA libraries.
+      *) args="${args} -last_pal";;
+
+      esac
+
+#  Generate arguments for linking the 2D graphics system.
+#  ------------------------------------------------------
+      case "${grf}" in
+
+#  If using Starlink PGPLOT, link with the AST PGPLOT interface and
+#  the Fortran library via the PGP link script.
+      pgp) args="${args} -last_pgplot `pgp_link_adam`";;
+
+#  If using native PGPLOT, link with the AST PGPLOT interface and
+#  the Fortran library via the PGPLOT link script.
+      pgplot) args="${args} -last_pgplot `pgplot_link_adam`";;
+
+#  If using own graphics which conform to the requirements of the current
+#  version of AST, do not produce any arguments.
+      current) :;;
+
+#  If using own graphics which conform to the requirements of version 5.6
+#  of AST, produce arguments which link in dummy implementations of any
+#  functions which are required by the current version of AST but which were
+#  not required by version 5.6.
+      v5.6) :;;
+
+#  If using own graphics which conform to the requirements of version 3.2
+#  of AST, produce arguments which link in dummy implementations of any
+#  functions which are required by the current version of AST but which were
+#  not required by version 3.2.
+      v3.2) args="${args} -last_grf_5.6";;
+
+#  If using own graphics which conform to the requirements of version 2.0
+#  of AST, produce arguments which link in dummy implementations of any
+#  functions which are required by the current version of AST but which were
+#  not required by version 2.0.
+      v2.0) args="${args} -last_grf_3.2 -last_grf_5.6";;
+
+#  Default graphics (none) requires linking with all the default (null) AST
+#  "grf" modules.
+      *) args="${args} -last_grf_2.0 -last_grf_3.2 -last_grf_5.6";;
+      esac
+
+#  Generate arguments for linking the 3D graphics system.
+#  ------------------------------------------------------
+      case "${grf3d}" in
+
+#  If using Starlink PGPLOT, link with the AST 3D PGPLOT interface and
+#  the Fortran library via the PGP link script (if found).
+      pgp) args="${args} -last_pgplot3d `\`find pgp_link\``"
+           f77='y';;
+
+#  If using native PGPLOT, link with the AST 3D PGPLOT interface and the
+#  Fortran library via the PGPLOT link script (if found).
+      pgplot) args="${args} -last_pgplot3d `\`find pgplot_link\``"
+              f77='y';;
+
+#  If using own 3D graphics which conform to the requirements of the current
+#  version of AST, do not produce any arguments.
+      current) :;;
+
+#  Default graphics (none) requires linking with all the default (null) AST
+#  "grf3d" modules.
+      *) args="${args} -last_grf3d";;
+      esac
+
+#  Make a second pass through the AST library.
+#  -------------------------------------------
+#  This library is a link to the main AST library and results in a second
+#  pass to resolve any backward references generated by the other modules
+#  used above. A different library name must be used to avoid the two passes
+#  being merged into one (either below, or by other link scripts).
+      args="${args} -last_pass2"
+
+#  Generate arguments for linking the error reporting system.
+#  ----------------------------------------------------------
+      case "${err}" in
+
+#  If using own error reporting, do not produce any arguments.
+      my) :;;
+
+#  Default error reporting requires linking with the AST EMS interface and
+#  the EMS library via the link script.
+      *) args="${args} -last_ems `ems_link_adam`";;
+      esac
+
+#  Link with the maths library.
+#  ----------------------------
+      args="${args} -lm"
+
+#  Link with the starmem library, if available.
+#  --------------------------------------------
+      args="${args} `\`find starmem_link\``"
+
+#  Pass the resulting argument list through an awk script which eliminates
+#  all except the last reference to each library.
+      echo "${args}" \
+           | awk 'BEGIN{RS=" ";FS="\n"}
+                  {if($1)f[i++]=$1}
+                  END{for(;i--;)if(!w[f[i]]++)l=f[i]" "l;print l}'
+
+#  End of script.