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Solaris 2.5 supports the following standards and specifications:

XPG4

The X/Open Portability Guide, Issue 4 (XPG4) specification contains internationalized utilities, headers, and interfaces.

If the behavior required by XPG4 utilities conflicts with existing Solaris behavior, the original Solaris version is not changed. Rather, a new version that is XPG4-compliant can be found in /usr/xpg4/bin. Therefore, when setting the PATH (sh or ksh) or path (csh) environment variables, /usr/xpg4/bin should precede any other directories in which XPG4 utilities are found, such as /usr/bin, /bin, /usr/ucb and /usr/ccs/bin for applications that want to take advantage of XPG4 features. Note that XPG4 includes all of the utilities in IEEE Std 1003.2-1992 and IEEE Std 1003.2a-1992 (together, commonly called POSIX.2).

An XPG4-compliant implementation must include an ANSI X3.159-1989 (ANSI C Language) standard conforming compilation system and the cc and c89 utilities. Solaris 2.5 was tested with the cc and c89 utilities and the compilation system in the SPROcc package provided by SPARCompilertm C 4.0 in the SPARC environment and ProCompilertm 3.0.1 (it is expected that a patch will be needed for the 2.5 FCS release) in the x86 environment. As specified by XPG4, applications must define the _XOPEN_VERSION macro to have value 4 before including any headers specified by XPG4 to get the features specified by XPG4. When cc is used to link applications, /usr/ccs/lib/values-xpg4.o must be specified on any link/load command line.

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