sanity.bbclass: Toolchain sanity checks

index 816c9c4..70bb10b 100644
@@ -11,7 +11,7 @@ TUNE_ARCH_tune-sh3 = "sh3"
 TUNE_PKGARCH_tune-sh3 = "sh3"
 PACKAGE_EXTRA_ARCHS_tune-sh3 = "sh sh3"
 
-TUNE_FEATURES_tune-sh3eb = "sh3eb"
+TUNE_FEATURES_tune-sh3eb = "sh3 bigendian"
 TUNE_ARCH_tune-sh3eb = "sh3eb"
 TUNE_PKGARCH_tune-sh3eb = "sh3eb"
 PACKAGE_EXTRA_ARCHS_tune-sh3eb = "sheb sh3eb"

index f971f23..00cfc3d 100644
@@ -18,7 +18,7 @@ TUNE_ARCH_tune-sh4 = "sh4"
 TUNE_PKGARCH_tune-sh4 = "sh4"
 PACKAGE_EXTRA_ARCHS_tune-sh4 = "sh sh4"
 
-TUNE_FEATURES_tune-sh4eb = "sh4eb"
+TUNE_FEATURES_tune-sh4eb = "sh4 bigendian"
 TUNE_ARCH_tune-sh4eb = "sh4eb"
 TUNE_PKGARCH_tune-sh4eb = "sh4eb"
 PACKAGE_EXTRA_ARCHS_tune-sh4eb = "sheb sh4eb"

@@ -28,7 +28,7 @@ TUNE_ARCH_tune-sh4a = "sh4"
 TUNE_PKGARCH_tune-sh4a = "sh4a"
 PACKAGE_EXTRA_ARCHS_tune-sh4a = "sh sh4 sh4a"
 
-TUNE_FEATURES_tune-sh4aeb = "sh4aeb"
+TUNE_FEATURES_tune-sh4aeb = "sh4a bigendian"
 TUNE_ARCH_tune-sh4aeb = "sh4eb"
 TUNE_PKGARCH_tune-sh4aeb = "sh4aeb"
 PACKAGE_EXTRA_ARCHS_tune-sh4aeb = "sheb sh4eb sh4aeb"

index 54f3727..80a3683 100644
@@ -10,7 +10,7 @@ TUNE_FEATURES_tune-xscale = "${TUNE_FEATURES_tune-armv5te} xscale"
 PACKAGE_EXTRA_ARCHS_tune-xscale = "${PACKAGE_EXTRA_ARCHS_tune-armv5te}"
 
 AVAILTUNES += "xscale-be"
-TUNE_FEATURES_tune-xscale-be = "${TUNE_FEATURES_tune-armv5teb} xscale-be"
+TUNE_FEATURES_tune-xscale-be = "${TUNE_FEATURES_tune-armv5teb} xscale bigendian"
 PACKAGE_EXTRA_ARCHS_tune-xscale-be = "${PACKAGE_EXTRA_ARCHS_tune-armv5teb}"
 
 # webkit-gtk has alignment issues with double instructions on armv5 so

index 687ddeb..ff11fec 100644
@@ -11,6 +11,72 @@ def raise_sanity_error(msg):
     
     %s""" % msg)
 
+# Check a single tune for validity.
+def check_toolchain_tune(data, tune, multilib):
+    tune_errors = []
+    if not tune or tune == "":
+        return "No tuning found for %s multilib." % multilib
+    bb.note("Sanity-checking tuning '%s' (%s) features:" % (tune, multilib))
+    features = data.getVar("TUNE_FEATURES_tune-%s" % tune, True) or ""
+    if features == '':
+        return "Tuning '%s' has no defined features, and cannot be used." % tune
+    features = features.split()
+    valid_tunes = data.getVarFlags('TUNEVALID') or ""
+    conflicts = data.getVarFlags('TUNECONFLICTS') or ""
+    split_conflicts = {}
+    for feature in features:
+        if feature in conflicts:
+            if feature not in split_conflicts:
+                split_conflicts[feature] = conflicts[feature].split()
+            for other in features:
+                if other in split_conflicts[feature]:
+                    tune_errors.append("Feature '%s' conflicts with '%s'." %
+                        ( feature, other ))
+        if feature in valid_tunes:
+            bb.note("  %s: %s" % (feature, valid_tunes[feature]))
+        else:
+            tune_errors.append("Feature '%s' is not defined." % feature)
+    whitelist = data.getVar("TUNEABI_WHITELIST", True) or ''
+    if whitelist != '':
+        override = data.getVar("TUNEABI_OVERRIDE", True) or ''
+        if not override:
+            tuneabi = data.getVar("TUNEABI_tune-%s" % tune, True) or ""
+            if tuneabi == "":
+                tuneabi = tune
+            if True not in [x in whitelist.split() for x in tuneabi.split()]:
+                tune_errors.append("Tuning '%s' (%s) cannot be used with any supported tuning/ABI." %
+                    (tune, tuneabi))
+    if tune_errors:
+        return "Tuning '%s' has the following errors:\n" + '\n'.join(tune_errors)
+
+def check_toolchain(data):
+    tune_error_set = []
+    deftune = data.getVar("DEFAULTTUNE", True)
+    tune_errors = check_toolchain_tune(data, deftune, 'default')
+    if tune_errors:
+        tune_error_set.append(tune_errors)
+
+    multilibs = data.getVar("MULTILIBS", True) or ""
+    if multilibs != "":
+        for pairs in [x.split(':') for x in multilibs.split()]:
+            if pairs[0] != 'multilib':
+                bb.warn("Got an unexpected '%s' in MULTILIBS." % pairs[0])
+            else:
+                if pairs[1] == 'lib':
+                    tune_error_set.append("The multilib 'lib' was specified, but that causes parse errors.")
+                else:
+                    tune = data.getVar("DEFAULTTUNE_virtclass-multilib-%s" % pairs[1], True)
+                    if tune == deftune:
+                        bb.warn("Multilib '%s' (%s) is also the default tuning." % (pairs[1], deftune))
+                    else:
+                        tune_errors = check_toolchain_tune(data, tune, pairs[1])
+                    if tune_errors:
+                        tune_error_set.append(tune_errors)
+    if tune_error_set:
+        return "Toolchain tunings invalid:\n" + '\n'.join(tune_error_set)
+
+    return ""
+
 def check_conf_exists(fn, data):
     bbpath = []
     fn = data.expand(fn)

@@ -327,6 +393,9 @@ def check_sanity(e):
         messages = messages + pseudo_msg + '\n'
 
     check_supported_distro(e)
+    toolchain_msg = check_toolchain(e.data)
+    if toolchain_msg != "":
+        messages = messages + toolchain_msg + '\n'
 
     # Check if DISPLAY is set if IMAGETEST is set
     if not data.getVar( 'DISPLAY', e.data, True ) and data.getVar( 'IMAGETEST', e.data, True ) == 'qemu':

index f4d6241..f41c79f 100644
@@ -34,6 +34,12 @@ TARGET_CC_ARCH[doc] = "FIXME"
 TARGET_FPU[doc] = "Floating point option (mostly for FPU-less systems), can be 'soft' or empty \
 for hardware floating point instructions."
 
+# WARNING:  Because the flags on these have semantic implecations,
+# they must not actually be defined.
+#TUNEVALID[doc] = "Descriptions of valid tuning features, stored as flags."
+#TUNEVALID[doc] = "List of conflicting features for a given feature."
+TUNEABI[doc] = "A base ABI used by a given tuning, used with prebuilt binaries."
+
 ASSUME_PROVIDED[doc] = "List of packages (recipes actually) which are assumed to be implicitly available.\
  These packages won't be built by bitbake."
 ASSUME_SHLIBS[doc] = "List of shlib:package[_version] mappings. Useful for lib packages in ASSUME_PROVIDED,\

index 6a3a63d..e4b59c9 100644
@@ -24,6 +24,10 @@ TUNEVALID[feature] - The <feature> is defined with a human readable
 explanation for what it does.  All architectural, cpu, abi, etc tuning 
 features must be defined using TUNEVALID.
 
+TUNECONFLICTS[feature] - A list of features which conflict with <feature>.
+New sanity checks will try to reject combinations in which a single
+tuning ends up with features which conflict with each other.
+
 TUNE_FEATURES - This is automatically defined as TUNE_FEATURES_tune-<tune>.
 See TUNE_FEATURES_tune-<tune> for more information.
 

index 9f03a0f..0f64562 100644
@@ -1,4 +1,5 @@
 ARMPKGSFX_DSP = "${@bb.utils.contains("TUNE_FEATURES", [ "armv5", "dsp" ], "e", "", d)}"
+TUNEVALID[dsp] = "ARM DSP functionality"
 
 require conf/machine/include/arm/arch-armv5.inc
 

index 629960d..c90aff5 100644
@@ -2,7 +2,7 @@ DEFAULTTUNE ?= "armv7a"
 
 ARMPKGARCH ?= "armv7a"
 
-TUNEVALID[armv7-a] = "Enable instructions for ARMv7-a"
+TUNEVALID[armv7a] = "Enable instructions for ARMv7-a"
 TUNE_CONFLICTS[armv7a] = "armv4 armv5 armv6 armv7"
 TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "armv7a", "-march=armv7-a -fno-tree-vectorize", "", d)}"
 MACHINEOVERRIDES .= "${@bb.utils.contains("TUNE_FEATURES", "armv7a", ":armv7a", "" ,d)}"

index a5dae88..15f67d7 100644
@@ -27,7 +27,7 @@ TUNE_ASARGS += "${@bb.utils.contains("TUNE_FEATURES", "mx32", "-x32", "", d)}"
 
 # ELF64 ABI
 TUNEVALID[m64] = "IA32e (x86_64) ELF64 standard ABI"
-TUNECONFLICT[m64] = "m32 mx32"
+TUNECONFLICTS[m64] = "m32 mx32"
 TUNE_ARCH .= "${@bb.utils.contains("TUNE_FEATURES", "m64", "${X86ARCH64}", "" ,d)}"
 TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "m64", "-m64", "", d)}"
 

index 8758ecd..9f12920 100644
@@ -12,15 +12,15 @@ TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "bigendian", "-meb", "-mel
 
 # ABI flags
 TUNEVALID[o32] = "MIPS o32 ABI"
-TUNECONFLICT[o32] = "n32 n64"
+TUNECONFLICTS[o32] = "n32 n64"
 TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "o32", "-mabi=32", "", d)}"
 
 TUNEVALID[n32] = "MIPS64 n32 ABI"
-TUNECONFLICT[n32] = "o32 n64"
+TUNECONFLICTS[n32] = "o32 n64"
 TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "n32", "-mabi=n32", "", d)}"
 
 TUNEVALID[n64] = "MIPS64 n64 ABI"
-TUNECONFLICT[n64] = "o32 n32"
+TUNECONFLICTS[n64] = "o32 n32"
 TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "n64", "-mabi=64", "", d)}"
 
 # Floating point

index 06fac8f..79bb67b 100644
@@ -1,7 +1,7 @@
 require conf/machine/include/ia32/arch-ia32.inc
 
 TUNEVALID[c3] = "VIA Cyrix III or VIA C3 specific optimizations"
-TUNECONFLICT[c3] = "m64 mx32"
+TUNECONFLICTS[c3] = "m64 mx32"
 TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "c3", "-march=c3 -mtune=c3", "", d)}"
 
 AVAILTUNES += "c3"