"useless" librt.so.1 dependency on Linux reported by dpkg-shlibdeps

[Baesken, Matthias]

Hi , when building Debian packages for 25 ,     a couple of messages  complaining about  “useless”  dependencies  show up .

One is about   libjvm.so depending on   librt.so.1     :

dpkg-shlibdeps: warning: package could avoid a useless dependency if
/usr/lib/jvm/jdk-25/lib/server/libjvm.so
were not linked against librt.so.1 (they use none of the library's symbols)


Looks like in old days, on old distros, this dependency was (maybe?) still useful   :

See  make/autoconf/libraries.m4  :

139   # librt for legacy clock_gettime
140   if test "x$OPENJDK_TARGET_OS" = xlinux; then
141     # Hotspot needs to link librt to get the clock_* functions.
142     # But once our supported minimum build and runtime platform
143     # has glibc 2.17, this can be removed as the functions are
144     # in libc.
145     BASIC_JVM_LIBS="$BASIC_JVM_LIBS -lrt"
146   fi


( seems some versions of  RHEL 7  / SLES 12  still had those old glibc versions)


Could we clean this up?
Or is there still some need  to  support this in jdk26  ?


Best regards, Matthias





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