Building of native image fails if `ant `clobber` has been called

[sophie-kaleba]

Linux-only (I assume)

A call to ant native after an ant clobber makes the build fail with the following error:

native:
     [exec] Error: Invalid Path entry /home/sopi/Documents/Experiments/SOMns/libs/truffle/substratevm/mxbuild/linux-amd64/SVM_HOSTED_NATIVE/linux-amd64
     [exec] Caused by: java.nio.file.NoSuchFileException: /home/sopi/Documents/Experiments/SOMns/libs/truffle/substratevm/mxbuild/linux-amd64/SVM_HOSTED_NATIVE/linux-amd64
     [exec] 

BUILD FAILED
/home/sopi/Documents/Experiments/SOMns/build.xml:544: exec returned: 1

The directory SVM_HOSTED_NATIVE is indeed missing. It is usually generated by a call to mx build in the substratevm directory.

it comes from a change made on the dev branch (the clobber command actually cleans the truffle build, along with this directory) - I assume a call to mx build for the substratevm is missing somewhere, that or clobber is being overzealous.

[smarr]

Hm, perhaps we miss a target that does that for svm.

Perhaps based on the one for truffle-libs: https://github.com/smarr/SOMns/blob/dev/build.xml#L158

[sophie-kaleba]

Actually, this line in the truffle-libs target <arg value="--no-native" unless:true="${build.native}" /> seems to prevent the build of the substratevm (see https://github.com/smarr/SOMns/blob/dev/build.xml#L164). Though I don't know why a first call to ant native does not raise the same issue.

Setting the value of build.native to true fixes the issue (ant -Dbuild.native=true native). But setting this value directly from the native target seems to be a pain because of the dependencies - I'll add a new target soon

[smarr]

There's something very broken here. Strange that it works in the CI environment.

This build.native variable isn't actually set anymore.

We may want to wrap the target as it was previously.
See this commit: be827bc