# This file should only be included in makefiles for Tcl extensions,
# NOT in the makefile for Tcl itself.

!ifndef _RULES_EXT_VC

# We need to run from the directory the parent makefile is located in.
# nmake does not tell us what makefile was used to invoke it so parent
# makefile has to set the MAKEFILEVC macro or we just make a guess and
# warn if we think that is not the case.
!if "$(MAKEFILEVC)" == ""

!if exist("$(PROJECT).vc")
MAKEFILEVC = $(PROJECT).vc
!elseif exist("makefile.vc")
MAKEFILEVC = makefile.vc
!endif
!endif # "$(MAKEFILEVC)" == ""

!if !exist("$(MAKEFILEVC)")
MSG = ^
You must run nmake from the directory containing the project makefile.^
If you are doing that and getting this message, set the MAKEFILEVC^
macro to the name of the project makefile.
!message WARNING: $(MSG)
!endif

!if "$(PROJECT)" == "tcl"
!error The rules-ext.vc file is not intended for Tcl itself.
!endif

# We extract version numbers using the nmakehlp program. For now use
# the local copy of nmakehlp. Once we locate Tcl, we will use that
# one if it is newer.
!if [$(CC) -nologo "nmakehlp.c" -link -subsystem:console > nul]
!endif

# First locate the Tcl directory that we are working with.
!if "$(TCLDIR)" != ""

_RULESDIR = $(TCLDIR:/=\)

!else

# If an installation path is specified, that is also the Tcl directory.
# Also Tk never builds against an installed Tcl, it needs Tcl sources
!if defined(INSTALLDIR) && "$(PROJECT)" != "tk"
_RULESDIR=$(INSTALLDIR:/=\)
!else
# Locate Tcl sources
!if [echo _RULESDIR = \> nmakehlp.out] \
   || [nmakehlp -L generic\tcl.h >> nmakehlp.out]
_RULESDIR = ..\..\tcl
!else
!include nmakehlp.out
!endif

!endif # defined(INSTALLDIR)....

!endif # ifndef TCLDIR

# Now look for the targets.vc file under the Tcl root. Note we check this
# file and not rules.vc because the latter also exists on older systems.
!if exist("$(_RULESDIR)\lib\nmake\targets.vc") # Building against installed Tcl
_RULESDIR = $(_RULESDIR)\lib\nmake
!elseif exist("$(_RULESDIR)\win\targets.vc")   # Building against Tcl sources
_RULESDIR = $(_RULESDIR)\win
!else
# If we have not located Tcl's targets file, most likely we are compiling
# against an older version of Tcl and so must use our own support files.
_RULESDIR = .
!endif

!if "$(_RULESDIR)" != "."
# Potentially using Tcl's support files. If this extension has its own
# nmake support files, need to compare the versions and pick newer.

!if exist("rules.vc") # The extension has its own copy

!if [echo TCL_RULES_MAJOR = \> versions.vc] \
   && [nmakehlp -V "$(_RULESDIR)\rules.vc" RULES_VERSION_MAJOR >> versions.vc]
!endif
!if [echo TCL_RULES_MINOR = \>> versions.vc] \
   && [nmakehlp -V "$(_RULESDIR)\rules.vc" RULES_VERSION_MINOR >> versions.vc]
!endif

!if [echo OUR_RULES_MAJOR = \>> versions.vc] \
   && [nmakehlp -V "rules.vc" RULES_VERSION_MAJOR >> versions.vc]
!endif
!if [echo OUR_RULES_MINOR = \>> versions.vc] \
   && [nmakehlp -V "rules.vc" RULES_VERSION_MINOR >> versions.vc]
!endif
!include versions.vc
# We have a newer version of the support files, use them
!if ($(TCL_RULES_MAJOR) != $(OUR_RULES_MAJOR)) || ($(TCL_RULES_MINOR) < $(OUR_RULES_MINOR))
_RULESDIR = .
!endif

!endif # if exist("rules.vc")

!endif # if $(_RULESDIR) != "."

# Let rules.vc know what copy of nmakehlp.c to use.
NMAKEHLPC = $(_RULESDIR)\nmakehlp.c

# Get rid of our internal defines before calling rules.vc
!undef TCL_RULES_MAJOR
!undef TCL_RULES_MINOR
!undef OUR_RULES_MAJOR
!undef OUR_RULES_MINOR

!if exist("$(_RULESDIR)\rules.vc")
!message *** Using $(_RULESDIR)\rules.vc
!include "$(_RULESDIR)\rules.vc"
!else
!error *** Could not locate rules.vc in $(_RULESDIR)
!endif

!endif # _RULES_EXT_VC
