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The "Sun"(now Oracle) compilers, debugger, and other tools are part of what is now called Oracle Solaris Studio.
You can download it here for free:
Click the "downloads" tab.
The current release is Studio 12.3, which includes C 5.12.
For Solaris, you should get the package version and install it via the automatic installer. (A tarball version is available, but you can't update a tarball version.)