Fix imaging value for generating sysimages for multiple targets

src/jitlayers.h

@@ -73,7 +73,7 @@ GlobalVariable *jl_emit_RTLD_DEFAULT_var(Module *M) JL_NOTSAFEPOINT;
 DataLayout jl_create_datalayout(TargetMachine &TM) JL_NOTSAFEPOINT;
 
 static inline bool imaging_default() JL_NOTSAFEPOINT {
-    return jl_options.image_codegen || (jl_generating_output() && jl_options.use_pkgimages);
+    return jl_options.image_codegen || (jl_generating_output() && (!jl_options.incremental || jl_options.use_pkgimages));
 }
 
 struct OptimizationOptions {

test/cmdlineargs.jl

@@ -726,6 +726,37 @@ let exename = `$(Base.julia_cmd()) --startup-file=no --color=no`
     end
 end
 
+# Object file with multiple cpu targets
+@testset "Object file for multiple microarchitectures" begin
+    julia_path = joinpath(Sys.BINDIR, Base.julia_exename())
+    outputo_file = tempname()
+    write(outputo_file, "1")
+    object_file = tempname() * ".o"
+
+    # This is to test that even with `pkgimages=no`, we can create object file
+    # with multiple cpu-targets
+    # The cmd is checked for `--object-o` as soon as it is run. So, to avoid long
+    # testing times, intentionally don't pass `--sysimage`; when we reach the
+    # corresponding error, we know that `check_cmdline` has already passed
+    let v = readchomperrors(`$julia_path
+        --cpu-target='native;native'
+        --output-o=$object_file $outputo_file
+        --pkgimages=no`)
+
+        @test v[1] == false
+        @test v[2] == ""
+        @test !contains(v[3], "More than one command line CPU targets specified")
+        @test v[3] == "ERROR: File \"boot.jl\" not found"
+    end
+
+    # This is to test that with `pkgimages=yes`, multiple CPU targets are parsed.
+    # We intentionally fail fast due to a lack of an `--output-o` flag.
+    let v = readchomperrors(`$julia_path --cpu-target='native;native' --pkgimages=yes`)
+        @test v[1] == false
+        @test v[2] == ""
+        @test contains(v[3], "More than one command line CPU targets specified")
+    end
+end
 
 # Find the path of libjulia (or libjulia-debug, as the case may be)
 # to use as a dummy shlib to open