Building the v1.5 branch on Linux with the Solaris Studio 12.2 compilers I see the following failure:
"[srcdir]/opal/event/event.h", line 797: Error: Type name expected instead of "u_char". "[srcdir]/opal/event/event.h", line 798: Error: Type name expected instead of "u_char". "[srcdir]/opal/event/event.h", line 1184: Error: "," expected instead of "*".
Where line 1184 is a prototype containing "u_char *".

As far as I can find, only several files below opal/event/ contain any use of "u_char".
There is a typedef for u_char in hwloc, but no use that I could see.

To the best of my knowledge u_char is NOT defined by any standard, and thus there is no particular header one can reliably find it in. The alternatives, of course are "unsigned char" or "uint8_t" (defined in stdint.h).

I had a look at the trunk and VISUALLY is appears the same problem exists in:
   opal/event/event.h
   opal/mca/event/libevent2013/libevent/event.h
However, my testing is currently confined to the v1.5 branch in the hopes of finally getting the next 1.5.5rc out the door.

-Paul

--
Paul H. Hargrove                          phhargr...@lbl.gov
Future Technologies Group
HPC Research Department                   Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900

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