On IU's research systems, how can I check the library file to see if a routine exists?
A software library is a collection of professionally developed software routines available for use in your programs.
To check either an archive (.a) or a shared object
(.so) library file on Indiana
University's research computing systems, use the
nm command. For example, if you want to see if
cos is inside the /usr/lib/libm.so library,
you could give the command:
You should see results similar to this:
[593] | 8312| 936|FUNC |GLOB |0 |9 |__acos [665] | 9264| 508|FUNC |GLOB |0 |9 |__acosh [554] | 28536| 200|FUNC |GLOB |0 |9 |__cos [611] | 14240| 816|FUNC |GLOB |0 |9 |__cosh [637] | 8312| 936|FUNC |WEAK |0 |9 |acos [574] | 9264| 508|FUNC |WEAK |0 |9 |acosh [667] | 28536| 200|FUNC |WEAK |0 |9 |cos [664] | 14240| 816|FUNC |WEAK |0 |9 |coshFor /usr/lib/libm.a, use the following command:
The results should be similar to the following:
/usr/lib/libm.a[acos.o]: .acos T 0 acos D 688 12 /usr/lib/libm.a[acosh.o]: .acosh T 0 acosh D 252 12 /usr/lib/libm.a[cos.o]: .cos T 0 cos D 624 12 /usr/lib/libm.a[cosh.o]: .cosh T 0 cosh D 524 12 .cos U - .cos U - /usr/lib/libm.a[acosF.o]: ._acos T 0 _acos D 688 12 /usr/lib/libm.a[cosF.o]: ._cos T 0 _cos D 624 12 /usr/lib/libm.a[coshF.o]: ._cosh T 0 _cosh D 524 12 /usr/lib/libm.a[_qacos.o]: ._qacos T 0 .acosl T 2012 _qacos D 2132 12 acosl D 2144 12 /usr/lib/libm.a[_qcosh.o]: ._qcosh T 0 .coshl T 628 _qcosh D 752 12 coshl D 764 12 /usr/lib/libm.a[_qsincos.o]: ._qcos T 100 .cosl T 2204 _qcos D 2308 12 cosl D 2332 12You can see the cos function is in
/usr/lib/libm.so and /usr/lib/libm.a.
You can also use the ar utility to check the content
of an archive (.a) file:
The results should appear similar to this:
acos.o acosh.o cos.o cosh.o acosF.o cosF.o coshF.o _qacos.o _qcosh.o _qsincos.oOn Quarry or Big Red, if you do not know which library files to search, the following command might locate the requested routine:
findobject w_exp.oThe results should be similar to this:
w_exp.o /usr/lib/x86_64-redhat-linux3E/lib64/libm.a 64-bit w_exp.o /usr/lib/libm.a 32-bit w_exp.o /usr/lib/i386-redhat-linux3E/lib/libm.a 32-bit w_exp.o /usr/lib64/libm.a 64-bit w_exp.op /usr/lib64/libm_p.a 64-bit w_exp.o /N/soft/linux-rhel4-x86_64/gcc-4.2.2/lib/libgcj.a 32-bit w_exp.o /N/soft/linux-rhel4-x86_64/gcc-4.2.2/lib64/libgcj.a 64-bit w_exp.o /N/soft/linux-rhel4-x86_64/gcc-4.1.1/lib/libgcj.a 32-bit w_exp.o /N/soft/linux-rhel4-x86_64/gcc-4.1.1/lib64/libgcj.a 64-bitThis document was developed with support from the National Science Foundation (NSF) under Grant No. 0503697 to the University of Chicago and subcontracted to Indiana University. Additional support was provided by IU through its participation in the TeraGrid, which is supported by the NSF under Grants No. 0833618, SCI451237, SCI535258, and SCI504075. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.
Last modified on February 16, 2009.
