Issue #1497 Revert "MoonchildProductions#1251 - Part 19"

"Make the unpreprocessed file script work on Solaris."

This reverts commit e51afbcc2fe7360bbcf5654f6e31752c48098ca0.

python/mozbuild/mozbuild/mach_commands.py

@@ -544,14 +544,9 @@ class Build(MachCommandBase):
         # Check if there are any unpreprocessed files in '@MOZ_OBJDIR@/dist/bin'
         # See python/mozbuild/mozbuild/preprocessor.py#L293-L309 for the list of directives
         # We skip if, ifdef, ifndef, else, elif, elifdef and elifndef, because they are never used alone
-        #
-        # The original version of this script only worked with GNU grep because of the --include flag. 
-        # Not a problem in and of itself, except that it didn't take TOOLCHAIN_PREFIX and simply assumed 
-        # all operating systems use GNU grep as the system grep (often it's called ggrep or something). 
-        # This script is a bit slower, but should do the same thing on all Unix platforms. 
-
-        grepcmd = 'find ' + self.topobjdir + '/dist/bin' + ' -name \'\*.{css,dtd,html,js,jsm,xhtml,xml,xul,manifest,properties,rdf}\' ' + '| xargs grep -E "^(#|%)(define|endif|error|expand|filter|include|literal|undef|unfilter)" '\
-                  + '| awk "/\.css:%/ || (!/\.css/ && /:#/)"'
+        grepcmd = 'grep -E -r "^(#|%)(define|endif|error|expand|filter|include|literal|undef|unfilter)" '\
+                  + '--include=\*.{css,dtd,html,js,jsm,xhtml,xml,xul,manifest,properties,rdf} '\
+                  + self.topobjdir + '/dist/bin | awk "/\.css:%/ || (!/\.css/ && /:#/)"'
         grepresult = subprocess.Popen(grepcmd, stdout=subprocess.PIPE, shell=True).communicate()[0]
         if grepresult:
             print('\nERROR: preprocessor was not applied to the following files:\n\n' + grepresult)