CI: Only run one CI job on Julia 1.9

.github/workflows/ci.yml

@@ -47,9 +47,9 @@ jobs:
       matrix:
         julia-version:
           - '1.6' # previous LTS
-          # - '1.9' # TODO: uncomment this line once we fix the tests on 1.9
           - '1.10' # current LTS
-          - '1.11'
+          - '1.11' # current stable
+          # - 'pre' # comment out when there is no pre-release available; uncomment when there is a pre-release available.
           # - 'nightly' # TODO: decide whether we want to run any CI jobs on nightly.
         julia-wordsize:
           # The value here only affects the version of Julia binary that we download.
@@ -65,7 +65,18 @@ jobs:
         coverage:
           - 'true'
           - 'false' # needed for Julia 1.9+ to test from a session using pkgimages
+        include:
+          # Julia 1.9 is no longer supported (by upstream Julia).
+          # Thus, we intentionally only run one Julia 1.9 CI job in this repo.
+          - julia-version: '1.9'
+            julia-wordsize: '64'
+            github-runner: ubuntu-latest
+            coverage: false
         exclude:
+          # For now, we'll disable testing 32-bit Julia 1.9 on all operating systems.
+          # TODO: remove the following once we fix the tests for 32-bit Julia 1.9 .
+          - julia-version: '1.9'
+            julia-wordsize: '32'
           # For now, we'll disable testing 32-bit Julia 1.9 on Windows.
           # TODO: remove the following once we fix the tests for 32-bit Julia 1.9 on Windows.
           - github-runner: windows-latest

examples/MyApp/src/MyApp.jl

@@ -5,7 +5,11 @@ using HelloWorldC_jll
 using Artifacts
 using Distributed
 using Random
-if VERSION >= v"1.7.0"
+
+# We seem to get problems with LLVMExtra_jll on Julia 1.6 and 1.9
+# Issue for 1.6: https://github.com/JuliaLang/PackageCompiler.jl/issues/706
+# There's no GitHub Issue for 1.9
+@static if (VERSION.major, VERSION.minor) ∉ ((1, 6), (1, 9),)
     using LLVMExtra_jll
 end
 
@@ -85,7 +89,7 @@ function real_main()
     @eval @everywhere using Example
     @everywhere println(Example.domath(3))
 
-    if VERSION >= v"1.7.0"
+    @static if (VERSION.major, VERSION.minor) ∉ ((1, 6), (1, 9),)
         if isfile(LLVMExtra_jll.libLLVMExtra_path)
             println("LLVMExtra path: ok!")
         else

test/runtests.jl

@@ -16,6 +16,7 @@ Base.init_depot_path()
 const is_ci = tryparse(Bool, get(ENV, "CI", "")) === true
 const is_slow_ci = is_ci && Sys.ARCH == :aarch64
 const is_julia_1_6 = VERSION.major == 1 && VERSION.minor == 6
+const is_julia_1_9 = VERSION.major == 1 && VERSION.minor == 9
 const is_julia_1_11 = VERSION.major == 1 && VERSION.minor == 11
 
 if is_ci
@@ -26,12 +27,8 @@ if is_slow_ci
     @warn "This is \"slow CI\" (`is_ci && Sys.ARCH == :aarch64`). Some tests will be skipped or modified." Sys.ARCH
 end
 
-if is_julia_1_6
-    @warn "This is Julia 1.6. Some tests will be skipped or modified." VERSION
-end
-
-if is_julia_1_11
-    @warn "This is Julia 1.11. Some tests will be skipped or modified." VERSION
+if any([is_julia_1_6, is_julia_1_9, is_julia_1_11])
+    @warn "This is Julia $(VERSION.major).$(VERSION.minor). Some tests will be skipped or modified." VERSION
 end
 
 function remove_llvmextras(project_file)
@@ -86,7 +83,7 @@ end
                 # On Julia 1.11, `incremental=false` is currently broken: https://github.com/JuliaLang/PackageCompiler.jl/issues/976
                 # So, for now, we skip the `incremental=false` tests on Julia 1.11
                 @warn "This is Julia 1.11; skipping incremental=false test due to known bug: https://github.com/JuliaLang/PackageCompiler.jl/issues/976"
-                @test_broken false
+                @test_skip false
                 continue
             end
             filter_stdlibs = (is_slow_ci ? (true, ) : (true, false))
@@ -97,8 +94,9 @@ end
             @info "starting: create_app testset" incremental filter
             tmp_app_source_dir = joinpath(tmp, "MyApp")
             cp(app_source_dir, tmp_app_source_dir)
-            if is_julia_1_6
-                # Issue #706 "Cannot locate artifact 'LLVMExtra'" on 1.6 so remove
+            if is_julia_1_6 || is_julia_1_9
+                # Julia 1.6: Issue #706 "Cannot locate artifact 'LLVMExtra'" on 1.6 so remove.
+                # Julia 1.9: There's no GitHub Issue, but it seems we hit a similar problem.
                 remove_llvmextras(joinpath(tmp_app_source_dir, "Project.toml"))
             end
             try
@@ -154,7 +152,11 @@ end
             @test occursin("From worker 4:\t8", app_output)
             @test occursin("From worker 5:\t8", app_output)
 
-            if VERSION >= v"1.7-"
+            if is_julia_1_6 || is_julia_1_9
+                # Julia 1.6: Issue #706 "Cannot locate artifact 'LLVMExtra'" on 1.6 so remove.
+                # Julia 1.9: There's no GitHub Issue, but it seems we hit a similar problem.
+                @test_skip false
+            else
                 @test occursin("LLVMExtra path: ok!", app_output)
             end
             @test occursin("micromamba_jll path: ok!", app_output)