[gnome-continuous-yocto/gnomeostree-3.28-rocko: 7102/8267] llvm: Raise SkipRecipe exception for unsupported architectures

[Emmanuele Bassi <ebassi src gnome org>]

commit f42754a2d87552a4b3b0b8bf5abaf22d814bf5bf
Author: Nathan Rossi <nathan nathanrossi com>
Date:   Wed Aug 2 21:09:16 2017 +1000

    llvm: Raise SkipRecipe exception for unsupported architectures
    
    When parsing this recipe on an unsupported or non-mappable architecture
    an error is generated despite no dependencies on the recipe. E.g.
    
      ERROR: .../llvm_git.bb: cannot map 'microblazeel' to a supported llvm architecture
    
    Instead of generating an error which might confuse users, raise a
    SkipRecipe exception similar to other arch-style mapping functions (e.g.
    go_map_arch). This avoids showing the error during parse, and prevents
    the use of the recipe on unsupported targets. Resulting in an error like
    so when trying to build llvm:
    
      ERROR: Nothing PROVIDES 'llvm'
      llvm was skipped: Cannot map 'microblazeel' to a supported LLVM architecture
    
    (From OE-Core rev: d796abac982f368aa088a291560b565cc47a2c27)
    
    Signed-off-by: Nathan Rossi <nathan nathanrossi com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/recipes-devtools/llvm/llvm_git.bb |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/meta/recipes-devtools/llvm/llvm_git.bb b/meta/recipes-devtools/llvm/llvm_git.bb
index 722bc53..f36e697 100644
--- a/meta/recipes-devtools/llvm/llvm_git.bb
+++ b/meta/recipes-devtools/llvm/llvm_git.bb
@@ -42,8 +42,7 @@ def get_llvm_arch(bb, d, arch_var):
     elif re.match('mips(isa|)(32|64|)(r6|)(el|)$', a): return 'Mips'
     elif re.match('p(pc|owerpc)(|64)', a):             return 'PowerPC'
     else:
-        bb.error("cannot map '%s' to a supported llvm architecture" % a)
-    return ""
+        raise bb.parse.SkipRecipe("Cannot map '%s' to a supported LLVM architecture" % a)
 
 def get_llvm_target_arch(bb, d):
     return get_llvm_arch(bb, d, 'TARGET_ARCH')