Fix bug #12955 with building under MSYS Bash.

 src/makefile.w32-in (globals.h, gl-stamp): Use $(SWITCHCHAR) instead
 of a literal "/".
 (gl-stamp): Invoke fc.exe directly, not through cmd.

nt/ChangeLog

+2012-11-23  Eli Zaretskii  <eliz@gnu.org>
+
+	* gmake.defs (SWITCHCHAR): Define to // under MSYS, / otherwise.
+	(Bug#12955)
+
+	* nmake.defs (SWITCHCHAR): Define to /.
+
 2012-11-23  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Assume POSIX 1003.1-1988 or later for dirent.h (Bug#12958).

nt/gmake.defs

@@ -69,10 +69,18 @@ sh_output := $(shell echo)
 ifeq "$(findstring ECHO, $(sh_output))" "ECHO"
 THE_SHELL = $(COMSPEC)$(ComSpec)
 SHELLTYPE=CMD
+SWITCHCHAR=/
 else
 USING_SH = 1
 THE_SHELL = $(SHELL)
 SHELLTYPE=SH
+# MSYS needs to double the slash in cmd-style switches to avoid
+# interpreting /x as a Posix style file name reference
+ifneq ($(MSYSTEM),)
+SWITCHCHAR=//
+else
+SWITCHCHAR=/
+endif
 endif
 
 MAKETYPE=gmake

nt/nmake.defs

@@ -22,6 +22,7 @@ all:
 
 THE_SHELL = $(COMSPEC)
 SHELLTYPE=CMD
+SWITCHCHAR=/
 
 MAKETYPE=nmake
 

src/ChangeLog

+2012-11-23  Eli Zaretskii  <eliz@gnu.org>
+
+	* makefile.w32-in (globals.h, gl-stamp): Use $(SWITCHCHAR) instead
+	of a literal "/".  (Bug#12955)
+	(gl-stamp): Invoke fc.exe directly, not through cmd.
+
 2012-11-23  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Assume POSIX 1003.1-1988 or later for dirent.h (Bug#12958).

src/makefile.w32-in

@@ -229,12 +229,12 @@ SOME_MACHINE_OBJECTS = dosfns.o msdos.o \
 obj = $(GLOBAL_SOURCES:.c=.o)
 
 globals.h: gl-stamp
-	@cmd /c rem true
+	@cmd $(SWITCHCHAR)c rem true
 
 gl-stamp: ../lib-src/$(BLD)/make-docfile.exe $(GLOBAL_SOURCES)
 	- $(DEL) gl-tmp
 	"$(THISDIR)/../lib-src/$(BLD)/make-docfile" -d . -g $(SOME_MACHINE_OBJECTS) $(obj) > gl-tmp
-	cmd /c "fc /b gl-tmp globals.h >nul 2>&1 || $(CP) gl-tmp globals.h"
+	fc.exe $(SWITCHCHAR)b gl-tmp globals.h >nul 2>&1 || $(CP) gl-tmp globals.h
 	- $(DEL) gl-tmp
 	echo timestamp > $@