[8u] RFR: 8206425: .gnu_debuglink sections added unconditionally when no debuginfo is stripped

[Severin Gehwolf]

Hi,

Please review this 8u-only change. JDK 10+ are not affected.

For JDK 8 builds which don't perform any debug info stripping no
.gnu_debuglink sections should get generated. The fix is to move the
objcopy --add-gnu-debuglink calls into branches which actually perform
some stripping: all_strip, min_strip. Thoughts?

Bug: https://bugs.openjdk.java.net/browse/JDK-8206425
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8206425/webrev.01/

Testing: Manually produced a build with no stripping and verified no
.gnu_debuglink sections got generated.

$ for i in $(find build/linux-x86_64-normal-server-release/images/j2sdk-image/ \
 | grep -E 'libjvm.so|libsaproc.so|libjsig.so'); do echo $i
 readelf --sections $i | grep gnu_debuglink; done
build/linux-x86_64-normal-server-release/images/j2sdk-image/jre/lib/amd64/libjsig.so
build/linux-x86_64-normal-server-release/images/j2sdk-image/jre/lib/amd64/libsaproc.so
build/linux-x86_64-normal-server-release/images/j2sdk-image/jre/lib/amd64/server/libjsig.so
build/linux-x86_64-normal-server-release/images/j2sdk-image/jre/lib/amd64/server/libjvm.so

Thanks,
Severin