Is it feasible to install c11 c-compiler on AIX 5.3? IBM documentation only refers to AIX 7.1 and higher being supported... but would it work if I attempt to install?
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No. AIX earlier than 7.1 is end of support. Upgrade the OS.
This is implied by the xlclang announcement requiring AIX 7.1 or later.
As to other compilers, a new enough GCC supports C11. May be some work to change over if your developers and build scripts expect xlc.
John Mahowald
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I understand that any AIX earlier than 7.1 is not supported. The question was not "is it supported?" but "can I do it on AIX 5.3 by adding whatever is necessary?" It is not practical to upgrade the OS on this machine at this time. – E. Zeiger May 04 '20 at 17:37
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I will not recommend an operating system that ended support 8 years ago. You are missing security updates as well as features. – John Mahowald May 04 '20 at 19:59