[Buildroot] [PATCH] core/br2-external: properly report unexpected errors

Yann E. MORIN yann.morin.1998 at free.fr
Sat Jan 28 10:41:32 UTC 2017

Unextected error in the br2-external script are properly caught, but
they are not reported properly, and we end up in either of two

  - the .br2-external.mk file is not generated, in which case make will
    try to find a rule to generate it (because the 'include' directive
    tries to generate missing files);

  - the .br-external.mk file is generated but does not contain the error
    variable, and thus the build might not get interrupted.

We fix that by using a trap on the pseudo ERR signal, to emit the error
variable on unexpected errors.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
 support/scripts/br2-external | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/support/scripts/br2-external b/support/scripts/br2-external
index 26bcac8..7e81608 100755
--- a/support/scripts/br2-external
+++ b/support/scripts/br2-external
@@ -40,6 +40,9 @@ main() {
     exec >"${ofile}"
+    # Trap any unexpected error to generate a meaningful error message
+    trap "error 'unexpected error while generating ${ofile}\n'" ERR
     do_validate ${@//:/ }

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