Toolchains: serialize build products when failure encountered

Author: staticfloat

.buildkite/run_bb_tests.yml

@@ -20,3 +20,5 @@ steps:
       arch: "${ARCH?}"
     soft_fail: "${SOFT_FAIL}"
     timeout_in_minutes: 120
+    artifact_paths:
+      - "BinaryBuilderToolchains.jl/test/*-files.tar.gz"

BinaryBuilderToolchains.jl/test/CToolchainTests.jl

@@ -159,6 +159,11 @@ ENV["TESTSUITE_OUTPUT_DIR"] = mktempdir(;cleanup=false)
                             p, output = capture_output(setenv(Cmd(["/bin/bash", "-c", "make clean-all && make compile-all"]), env))
                             if !success(p)
                                 println(output)
+
+                                # Tar up build products for later inspection
+                                tarball_path = joinpath(@__DIR__, "$(triplet(target))-$(vendor)-files.tar.gz")
+                                run(`tar -C $(ENV["TESTSUITE_OUTPUT_DIR"]) -czf $(tarball_path) .`)
+                                @info("Build products saved", tarball_path)
                             end
                             @test success(p)
                         end