Warning codes

Dear Experts,

i am very to AIX when i am trying to compile my code i am getting two warning several times like

1540-0053 (W) The declaration of a class member within the class definition must not be qualified.
"/usr/include/alloca.h", line 34.9: 1540-1401 (I) An unknown "pragma __alloca" is specified.

i am not getting what these two warnings stands for,
how to resolve them whether we can neglect them or they have any performance issue please help me to solve this.

Dear Experts,

if i have .a(archive) file, i have one.a and two.a how to create a shared object from the archive file please tell as i am getting confused with lot of options.