Bug 707512 - Abort Windows Pymake builds with a clearer error if MOZ_…

…OBJDIR is an MSYS style path; r=ted

client.mk

@@ -115,7 +115,7 @@ endif
 ####################################
 # Sanity checks
 
-ifneq (,$(filter MINGW%,$(shell uname -s)))
+ifneq (,$(findstring mingw,$(CONFIG_GUESS)))
 # check for CRLF line endings
 ifneq (0,$(shell $(PERL) -e 'binmode(STDIN); while (<STDIN>) { if (/\r/) { print "1"; exit } } print "0"' < $(TOPSRCDIR)/client.mk))
 $(error This source tree appears to have Windows-style line endings. To \
@@ -133,15 +133,20 @@ MOZCONFIG_LOADER := build/autoconf/mozconfig2client-mk
 MOZCONFIG_FINDER := build/autoconf/mozconfig-find 
 MOZCONFIG_MODULES := build/unix/uniq.pl
 
-
-
 run_for_side_effects := \
   $(shell $(TOPSRCDIR)/$(MOZCONFIG_LOADER) $(TOPSRCDIR) $(TOPSRCDIR)/.mozconfig.mk > $(TOPSRCDIR)/.mozconfig.out)
 
 include $(TOPSRCDIR)/.mozconfig.mk
 
 ifndef MOZ_OBJDIR
   MOZ_OBJDIR = obj-$(CONFIG_GUESS)
+else
+# On Windows Pymake builds check MOZ_OBJDIR doesn't start with "/"
+  ifneq (,$(findstring mingw,$(CONFIG_GUESS)))
+  ifeq (1_a,$(.PYMAKE)_$(firstword a$(subst /, ,$(MOZ_OBJDIR))))
+  $(error For Windows Pymake builds, MOZ_OBJDIR must be a Windows [and not MSYS] style path.)
+  endif
+  endif
 endif
 
 ifdef MOZ_BUILD_PROJECTS