Make BBMASK support multiple regular expressions

index e5aeffc..ae7e4ce 100644
@@ -1142,14 +1142,14 @@
                     to "hide" these <filename>.bb</filename> and
                     <filename>.bbappend</filename> files.
                     BitBake ignores any recipe or recipe append files that
-                    match the expression.
+                    match any of the expressions.
                     It is as if BitBake does not see them at all.
                     Consequently, matching files are not parsed or otherwise
                     used by BitBake.</para>
                 <para>
-                    The value you provide is passed to Python's regular
+                    The values you provide are passed to Python's regular
                     expression compiler.
-                    The expression is compared against the full paths to
+                    The expressions are compared against the full paths to
                     the files.
                     For complete syntax information, see Python's
                     documentation at

@@ -1165,18 +1165,16 @@
      BBMASK = "meta-ti/recipes-misc/"
                     </literallayout>
                     If you want to mask out multiple directories or recipes,
-                    use the vertical bar to separate the regular expression
-                    fragments.
+                    you can specify multiple regular expression fragments.
                     This next example masks out multiple directories and
                     individual recipes:
                     <literallayout class='monospaced'>
-     BBMASK = "meta-ti/recipes-misc/|meta-ti/recipes-ti/packagegroup/"
-     BBMASK .= "|.*meta-oe/recipes-support/"
-     BBMASK .= "|.*openldap"
-     BBMASK .= "|.*opencv"
-     BBMASK .= "|.*lzma"
+     BBMASK += "/meta-ti/recipes-misc/ meta-ti/recipes-ti/packagegroup/"
+     BBMASK += "/meta-oe/recipes-support/"
+     BBMASK += "/meta-foo/.*/openldap"
+     BBMASK += "opencv.*\.bbappend"
+     BBMASK += "lzma"
                     </literallayout>
-                    Notice how the vertical bar is used to append the fragments.
                     <note>
                         When specifying a directory name, use the trailing
                         slash character to ensure you match just that directory

index 673e431..49aea7a 100644
@@ -1200,17 +1200,13 @@
 
         <glossentry id='var-BBMASK'><glossterm>BBMASK</glossterm>
             <info>
-                BBMASK[doc] = "Prevents BitBake from processing specific recipes or recipe append files. Use the BBMASK variable from within conf/local.conf."
+                BBMASK[doc] = "Prevents BitBake from processing specific recipes or recipe append files."
             </info>
             <glossdef>
                 <para role="glossdeffirst">
 <!--                <para role="glossdeffirst"><imagedata fileref="figures/define-generic.png" /> -->
                     Prevents BitBake from processing recipes and recipe
                     append files.
-                    Use the <filename>BBMASK</filename> variable from within the
-                    <filename>conf/local.conf</filename> file found
-                    in the
-                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                 </para>
 
                 <para>

@@ -1218,14 +1214,14 @@
                     to "hide" these <filename>.bb</filename> and
                     <filename>.bbappend</filename> files.
                     BitBake ignores any recipe or recipe append files that
-                    match the expression.
+                    match any of the expressions.
                     It is as if BitBake does not see them at all.
                     Consequently, matching files are not parsed or otherwise
                     used by BitBake.</para>
                 <para>
-                    The value you provide is passed to Python's regular
+                    The values you provide are passed to Python's regular
                     expression compiler.
-                    The expression is compared against the full paths to
+                    The expressions are compared against the full paths to
                     the files.
                     For complete syntax information, see Python's
                     documentation at

@@ -1241,18 +1237,16 @@
      BBMASK = "meta-ti/recipes-misc/"
                     </literallayout>
                     If you want to mask out multiple directories or recipes,
-                    use the vertical bar to separate the regular expression
-                    fragments.
+                    you can specify multiple regular expression fragments.
                     This next example masks out multiple directories and
                     individual recipes:
                     <literallayout class='monospaced'>
-     BBMASK = "meta-ti/recipes-misc/|meta-ti/recipes-ti/packagegroup/"
-     BBMASK .= "|.*meta-oe/recipes-support/"
-     BBMASK .= "|.*openldap"
-     BBMASK .= "|.*opencv"
-     BBMASK .= "|.*lzma"
+     BBMASK += "/meta-ti/recipes-misc/ meta-ti/recipes-ti/packagegroup/"
+     BBMASK += "/meta-oe/recipes-support/"
+     BBMASK += "/meta-foo/.*/openldap"
+     BBMASK += "opencv.*\.bbappend"
+     BBMASK += "lzma"
                     </literallayout>
-                    Notice how the vertical bar is used to append the fragments.
                     <note>
                         When specifying a directory name, use the trailing
                         slash character to ensure you match just that directory

index e09f7d8..a74da77 100644
@@ -91,7 +91,7 @@ BBINCLUDELOGS[doc] = "Variable that controls how BitBake displays logs on build
 BBINCLUDELOGS_LINES[doc] = "Amount of log lines printed on failure."
 BBLAYERS[doc] = "Lists the layers to enable during the build. This variable is defined in the bblayers.conf configuration file."
 BBLAYERS_NON_REMOVABLE[doc] = "Lists core layers that cannot be removed from the bblayers.conf file."
-BBMASK[doc] = "Prevents BitBake from processing specific recipes or recipe append files. Use the BBMASK variable from within conf/local.conf."
+BBMASK[doc] = "Prevents BitBake from processing specific recipes or recipe append files."
 BBPATH[doc] = "Used by BitBake to locate .bbclass and configuration files. This variable is analogous to the PATH variable."
 BBSERVER[doc] = "Points to the server that runs memory-resident BitBake."
 BINCONFIG_GLOB[doc] = "When inheriting binconfig.bbclass from a recipe, this variable specifies a wildcard for configuration scripts that need editing."

index 925270b..521cdcb 100644
@@ -1,4 +1,4 @@
-# BBMASK is a regular expression that can be used to tell BitBake to ignore
+# BBMASK contains regular expressions that can be used to tell BitBake to ignore
 # certain recipes.
 #BBMASK = ""
 

@@ -375,7 +375,7 @@
 #
 # Currently the rootfs_rpm code has a hard depends on rpmresolve:do_populate_sysroot,
 # when using rpm4 the rpmresolve code will not compile due to a missing header file.
-# That dependency needs to be removed when using RPM4, also the PREFRRED_VERSION needs
+# That dependency needs to be removed when using RPM4, also the PREFERRED_VERSION needs
 # to be set. This example shows how to enable rpm4
 # PREFERRED_VERSION_rpm = "4.11.2"
 # PREFERRED_VERSION_rpm-native = "4.11.2"

index 9c58d95..a02d143 100644
@@ -1759,11 +1759,24 @@ class CookerCollectFiles(object):
         bbmask = config.getVar('BBMASK', True)
 
         if bbmask:
+            # First validate the individual regular expressions and ignore any
+            # that do not compile
+            bbmasks = []
+            for mask in bbmask.split():
+                try:
+                    re.compile(mask)
+                    bbmasks.append(mask)
+                except sre_constants.error:
+                    collectlog.critical("BBMASK contains an invalid regular expression, ignoring: %s" % mask)
+
+            # Then validate the combined regular expressions. This should never
+            # fail, but better safe than sorry...
+            bbmask = "|".join(bbmasks)
             try:
                 bbmask_compiled = re.compile(bbmask)
             except sre_constants.error:
-                collectlog.critical("BBMASK is not a valid regular expression, ignoring.")
-                return list(newfiles), 0
+                collectlog.critical("BBMASK is not a valid regular expression, ignoring: %s" % bbmask)
+                bbmask = None
 
         bbfiles = []
         bbappend = []