Merge 'pkg/fix/blacklist-llvm' (RIOT-OS#9734)

pkg/jerryscript/Makefile.include

@@ -1,2 +1,8 @@
 INCLUDES += -I$(PKGDIRBASE)/jerryscript/jerry-core/include
 INCLUDES += -I$(PKGDIRBASE)/jerryscript/jerry-ext/include
+
+ifneq (,$(filter cortex-m%,$(CPU_ARCH)))
+  # There is a linking issue to `_setjmp()` and `stderr` when compiling
+  # for Cortex-M with LLVM/clang
+  TOOLCHAINS_BLACKLIST += llvm
+endif

pkg/libcose/Makefile.include

@@ -10,3 +10,9 @@ endif
 
 # Declare pseudomodules here to be selfcontained
 PSEUDOMODULES += libcose_crypt_%
+
+ifneq (,$(filter cortex-m0%,$(CPU_ARCH)))
+  # There is a problem with the LLVM assembler, the M0(+) instruction set, and
+  # the assembly part of this package
+  TOOLCHAINS_BLACKLIST += llvm
+endif

pkg/micro-ecc/Makefile.include

@@ -1 +1,7 @@
 INCLUDES += -I$(PKGDIRBASE)/micro-ecc
+
+ifneq (,$(filter cortex-m0%,$(CPU_ARCH)))
+  # LLVM/clang can't handle the inline assembler instructions on M0 in this
+  # package
+  TOOLCHAINS_BLACKLIST += llvm
+endif

pkg/openthread/Makefile.include

@@ -8,3 +8,9 @@ ifneq (,$(filter openthread_contrib,$(USEMODULE)))
   DIRS += $(OPENTHREAD_DIR)/contrib
   DIRS += $(OPENTHREAD_DIR)/contrib/netdev
 endif
+
+ifneq (,$(filter cortex-m0%,$(CPU_ARCH)))
+  # There are problem with unused `-mcpu...` arguments in clang and with
+  # ranlib + LLVM/clang in this package with Cortex-M
+  TOOLCHAINS_BLACKLIST += llvm
+endif