Experimental Physics and
Industrial Control System

Dear EPICS experts,

I'm confused with libca.so (Channel Access) dependency on readline:

.../base-3.15.9% ldd lib/linux-x86_64/libca.so.3.15.9
	linux-vdso.so.1 =>  (0x00007ffedfcf0000)
	libCom.so.3.15.9 => /tmp/x/base-3.15.9/lib/linux-x86_64/libCom.so.3.15.9 (0x00007fcd4fd3e000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fcd4faf5000)
	libreadline.so.6 => /lib64/libreadline.so.6 (0x00007fcd4f8af000)
	^^^^^^^^^^^^^^^^
	librt.so.1 => /lib64/librt.so.1 (0x00007fcd4f6a7000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007fcd4f4a2000)
	libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fcd4f199000)
	libm.so.6 => /lib64/libm.so.6 (0x00007fcd4ee97000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fcd4ec80000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fcd4e8bf000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fcd5021d000)
	libtinfo.so.5 => /lib64/libtinfo.so.5 (0x00007fcd4e695000)


The same applies to libcas.so (Portable Channel Access):

.../base-3.15.9% ldd lib/linux-x86_64/libcas.so.3.15.9
	linux-vdso.so.1 =>  (0x00007fff46ff3000)
	libca.so.3.15.9 => /tmp/x/base-3.15.9/lib/linux-x86_64/libca.so.3.15.9 (0x00007f133ec63000)
	libgdd.so.3.15.9 => /tmp/x/base-3.15.9/lib/linux-x86_64/libgdd.so.3.15.9 (0x00007f133ea2e000)
	libCom.so.3.15.9 => /tmp/x/base-3.15.9/lib/linux-x86_64/libCom.so.3.15.9 (0x00007f133e7ba000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f133e572000)
	libreadline.so.6 => /lib64/libreadline.so.6 (0x00007f133e32b000)
	^^^^^^^^^^^^^^^^
	librt.so.1 => /lib64/librt.so.1 (0x00007f133e123000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007f133df1f000)
	libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f133dc15000)
	libm.so.6 => /lib64/libm.so.6 (0x00007f133d913000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f133d6fd000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f133d33b000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f133f112000)
	libtinfo.so.5 => /lib64/libtinfo.so.5 (0x00007f133d111000)

Is this really required or is it a known bug?

Interestingly, 7.0.7 is free of this problem:

.../base-7.0.7% ldd ./lib/linux-x86_64/libca.so.4.14.2
	linux-vdso.so.1 =>  (0x00007ffe3e124000)
	libCom.so.3.22.0 => /tmp/x/base-7.0.7/lib/linux-x86_64/libCom.so.3.22.0 (0x00007f0268bd2000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f0268989000)
	librt.so.1 => /lib64/librt.so.1 (0x00007f0268781000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007f026857d000)
	libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f0268273000)
	libm.so.6 => /lib64/libm.so.6 (0x00007f0267f71000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f0267d5b000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f0267999000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f02690b1000)

With best regards,
Dmitry

Replies:

Re: Why does libca.so depend on libreadline.so? Michael Davidsaver via Tech-talk

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