RFR(XXS): 8205916: [test] Fix jdk/tools/launcher/RunpathTest to handle both, RPATH and RUNPATH (original) (raw)

Martin Buchholz martinrb at google.com
Wed Jun 27 14:45:08 UTC 2018

Looks good to me!

On Wed, Jun 27, 2018 at 3:26 AM, Volker Simonis <volker.simonis at gmail.com> wrote:

Hi,

can I please have a review for the following tiny test fix (I'm actually not sure which would be the appropriate mailing list for this fix so please redirect if necessary): http://cr.openjdk.java.net/~simonis/webrevs/2018/8205916/ https://bugs.openjdk.java.net/browse/JDK-8205916 The test currently only checks for RPATH in the dynamic section of the launcher, but some linkers / Linux distributions (notably SLES) use RUNPATH instead. Following are the gory details: The test jdk/tools/launcher/RunpathTest.java checks that the java launcher on Linux and Solaris has the correct RPATH path baked into the executable. Unfortunately, the situation with RPATH is a little weird: - in order to bake a runtime path into a dynamically linked library or executable one has to use the "-rpath " linker option (from the C/C++ compiler this is usually available as "-Wl,-rpath,"). - depending on the dynamic linker version and Linux distribution, the "-rpath" linker option adds either a "RPATH" entry (Ubuntu 16.04, RHEL 7.4) or a "RUNPATH" entry (SLES 12.1, SLES 15) or both entries together (SLES 11.3) to the dynamic section of the shared library/executable. - the semantics of "RPATH" and "RUNPATH" are slightly different: "RPATH" is evaluated at runtime before LDLIBRARYPATH (if "RUNPATH" isn't present) while "RUNPATH" is evaluated after LDLIBRARYPATH (i.e. RUNPATH can be overridden at runtime by setting LDLIBRARYPATH). - "RPATH" is considered obsolete and should be replaced by "RUNPATH" according to the man-page of "ld.so (8)". - the linker option "--enable-new-dtags"/"--disable-new-dtags" (or the corresponding compiler flags "-Wl,--enable-new-dtags"/"-Wl,--disable-new-dtags") can be used to enforce the generation of "RUNPATH"/"RPATH" respectively (except for systems like SLES 11.3 where "--enable-new-dtags" generates both "RPATH" and "RUNPATH" while "--disable-new-dtags" only generates "RPATH"). But this issue is not about fixing the build so to cut a long story short - the test RunpathTest.java should be able to handle both runtime path variants equally well. This can be easily achieved by extending the match pattern from ".*RPATH.\$ORIGIN/../lib." to ".*R(UN)?PATH.\$ORIGIN/../lib." Thank you and best regards, Volker

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