Smarter platform detection rules.vc patch.

From fc8bcccb56137c25154d213838e4b0a508762476 Mon Sep 17 00:00:00 2001
From: Pat Thoyts <patthoyts@users.sourceforge.net>
Date: Wed, 20 Apr 2011 01:40:51 +0100
Subject: [PATCH] Support cross-compilation to x64 from ix86 hosts.

Part of the build uses tclsh to generate files. Ensure we can specify
a runnable executable using TCLSH_NATIVE when cross-compiling.
This patch also gets smarter about finding the compiler version,
the compiler target architecture and the native architecture.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
---
 win/makefile.vc |   13 +++++++-
 win/rules.vc    |   88 ++++++++++++++++++++++++++++--------------------------
 2 files changed, 57 insertions(+), 44 deletions(-)

diff --git a/win/makefile.vc b/win/makefile.vc
index 35aef18..7dc96b7 100644
--- a/win/makefile.vc
+++ b/win/makefile.vc
@@ -208,6 +208,15 @@ TCLDDELIB	= $(OUT_DIR)\$(TCLDDELIBNAME)
 TCLTEST		= $(OUT_DIR)\$(PROJECT)test.exe
 CAT32		= $(OUT_DIR)\cat32.exe
 
+# Can we run what we build? IX86 runs on all architectures.
+!ifndef TCLSH_NATIVE
+!if "$(MACHINE)" == "IX86" || "$(MACHINE)" == "$(NATIVE_ARCH)"
+TCLSH_NATIVE	= $(TCLSH)
+!else
+!error You must explicitly set TCLSH_NATIVE for cross-compilation
+!endif
+!endif
+
 ### Make sure we use backslash only.
 LIB_INSTALL_DIR		= $(_INSTALLDIR)\lib
 BIN_INSTALL_DIR		= $(_INSTALLDIR)\bin
@@ -1015,13 +1024,13 @@ install-libraries: tclConfig install-msgs install-tzdata
 install-tzdata:
 	@echo Installing time zone data
 	@set TCL_LIBRARY=$(ROOT)/library
-	@$(TCLSH) "$(ROOT)/tools/installData.tcl" \
+	@$(TCLSH_NATIVE) "$(ROOT)/tools/installData.tcl" \
 	    "$(ROOT)/library/tzdata" "$(SCRIPT_INSTALL_DIR)/tzdata"
 
 install-msgs:
 	@echo Installing message catalogs
 	@set TCL_LIBRARY=$(ROOT)/library
-	@$(TCLSH) "$(ROOT)/tools/installData.tcl" \
+	@$(TCLSH_NATIVE) "$(ROOT)/tools/installData.tcl" \
 	    "$(ROOT)/library/msgs" "$(SCRIPT_INSTALL_DIR)/msgs"
 
 #---------------------------------------------------------------------
diff --git a/win/rules.vc b/win/rules.vc
index 865b10d..c30b1cd 100644
--- a/win/rules.vc
+++ b/win/rules.vc
@@ -27,18 +27,6 @@ _INSTALLDIR	= C:\Program Files\Tcl
 _INSTALLDIR	= $(INSTALLDIR:/=\)
 !endif
 
-!ifndef MACHINE
-!if "$(CPU)" == "" || "$(CPU)" == "i386"
-MACHINE		= IX86
-!else
-MACHINE         = $(CPU)
-!endif
-!endif
-
-!ifndef CFG_ENCODING
-CFG_ENCODING	= \"cp1252\"
-!endif
-
 #----------------------------------------------------------
 # Set the proper copy method to avoid overwrite questions
 # to the user when copying files and selecting the right
@@ -64,6 +52,51 @@ ERRNULL = >NUL # Win9x shell cannot redirect stderr
 !endif
 MKDIR   = mkdir
 
+#------------------------------------------------------------------------------
+# Determine the host and target architectures and compiler version.
+#------------------------------------------------------------------------------
+
+_HASH=^#
+_VC_MANIFEST_EMBED_EXE=
+_VC_MANIFEST_EMBED_DLL=
+VCVER=0
+!if ![echo VCVERSION=_MSC_VER > vercl.x] \
+    && ![echo $(_HASH)if defined(_M_IX86) >> vercl.x] \
+    && ![echo ARCH=IX86 >> vercl.x] \
+    && ![echo $(_HASH)elif defined(_M_AMD64) >> vercl.x] \
+    && ![echo ARCH=AMD64 >> vercl.x] \
+    && ![echo $(_HASH)endif >> vercl.x] \
+    && ![echo VCVERSION=_MSC_VER >> vercl.x] \
+    && ![cl -nologo -TC -P vercl.x $(ERRNULL)]
+!include vercl.i
+!if ![echo VCVER= ^\> vercl.vc] \
+    && ![set /a $(VCVERSION) / 100 - 6 >> vercl.vc]
+!include vercl.vc
+!endif
+!endif
+!if ![del /q/f vercl.x vercl.i vercl.vc]
+!endif
+
+!if ![reg query HKLM\Hardware\Description\System\CentralProcessor\0 /v Identifier | findstr /i x86]
+NATIVE_ARCH=IX86
+!else
+NATIVE_ARCH=AMD64
+!endif
+
+# Since MSVC8 we must deal with manifest resources.
+!if $(VCVERSION) >= 1400
+_VC_MANIFEST_EMBED_EXE=if exist $@.manifest mt -nologo -manifest $@.manifest -outputresource:$@;1
+_VC_MANIFEST_EMBED_DLL=if exist $@.manifest mt -nologo -manifest $@.manifest -outputresource:$@;2
+!endif
+
+!ifndef MACHINE
+MACHINE=$(ARCH)
+!endif
+
+!ifndef CFG_ENCODING
+CFG_ENCODING	= \"cp1252\"
+!endif
+
 !message ===============================================================================
 
 #----------------------------------------------------------
@@ -176,36 +209,6 @@ LINKERFLAGS     =-ltcg
 !endif
 
 #----------------------------------------------------------
-# MSVC8 (ships with Visual Studio 2005) generates a manifest
-# file that we should link into the binaries. This is how.
-#----------------------------------------------------------
-
-_VC_MANIFEST_EMBED_EXE=
-_VC_MANIFEST_EMBED_DLL=
-VCVER=0
-!if ![echo VCVERSION=_MSC_VER > vercl.x] \
-    && ![cl -nologo -TC -P vercl.x $(ERRNULL)]
-!include vercl.i
-!if $(VCVERSION) >= 1600
-VCVER=10
-!elseif $(VCVERSION) >= 1500
-VCVER=9
-!elseif $(VCVERSION) >= 1400
-VCVER=8
-!elseif $(VCVERSION) >= 1300
-VCVER=7
-!elseif $(VCVERSION) >= 1200
-VCVER=6
-!endif
-!endif
-
-# Since MSVC8 we must deal with manifest resources.
-!if $(VCVERSION) >= 1400
-_VC_MANIFEST_EMBED_EXE=if exist $@.manifest mt -nologo -manifest $@.manifest -outputresource:$@;1
-_VC_MANIFEST_EMBED_DLL=if exist $@.manifest mt -nologo -manifest $@.manifest -outputresource:$@;2
-!endif
-
-#----------------------------------------------------------
 # Decode the options requested.
 #----------------------------------------------------------
 
@@ -667,6 +670,7 @@ TK_INCLUDES     = -I"$(_TKDIR)\generic" -I"$(_TKDIR)\win" -I"$(_TKDIR)\xlib"
 !message *** Suffix for binaries will be '$(SUFX)'
 !message *** Optional defines are '$(OPTDEFINES)'
 !message *** Compiler version $(VCVER). Target machine is $(MACHINE)
+!message *** Host architecture is $(NATIVE_ARCH)
 !message *** Compiler options '$(COMPILERFLAGS) $(OPTIMIZATIONS) $(DEBUGFLAGS) $(WARNINGS)'
 !message *** Link options '$(LINKERFLAGS)'
 
-- 
1.7.4.msysgit.0