sbom/spdx file not reproducible (contains build path)

Affected to "build system" and "documentation" but unsure where it belongs to.

If I build twice qt but each time from a different location, it will have unreproducible output because the full build path is written in RelationshipComment: field

For example in
./usr/lib/i386-linux-gnu/qt-android-6.9-x86/sbom/qtdeclarative-6.9.0.spdx

Run 1:
242 RelationshipComment:·/tmp/reprotest.cX0lEL/build-experiment-1/build-experiment-1/debian/build-armeabi-v7a/qtbase/include/QtQml/qtqmlexports.h

Run 2:
242 RelationshipComment:·/builds/bastif/qt-android/debian/output/source_dir/debian/build-armeabi-v7a/qtbase/include/QtQml/qtqmlexports.h
 

Other fields also differ, but likely because the path differ. For example:

• PackageVerificationCode
• ExternalDocumentRef