Bug 912908 - Build xpcom/sample as shared library. r=joey

xpcom/sample/Makefile.in

@@ -10,6 +10,15 @@ SHORT_LIBNAME	= xpcomsmp
 # IS_COMPONENT indicates that this makefile builds a component shared library.
 IS_COMPONENT	= 1
 
+# NOTE:
+####################################################################
+# Variable assignment(s) should be maintained within moz.build files 
+# whenever possible. Migrate existing Makefile.in content into the 
+# corresponding moz.build file, then run 'mach configure' to determine 
+# if the variable is suppported. If not supported / not yet converted- 
+# open a Build::Config bug requesting conversion of the variable.
+####################################################################
+
 # If this is Makefile builds a component, MODULE_NAME must match the module
 # name specified in NS_IMPL_NSGETMODULE
 MODULE_NAME	= nsSampleModule

xpcom/sample/moz.build

@@ -27,6 +27,10 @@ EXTRA_COMPONENTS += [
     'nsSample.manifest',
 ]
 
+# FORCE_SHARED_LIB tells the build system that this should be a shared library,
+# even in a static build.
+FORCE_SHARED_LIB = True
+
 # LIBRARY_NAME names the library generated by this makefile,
 # i.e. dist/bin/components/libxpcomsample.so
 LIBRARY_NAME = 'xpcomsample'