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Status Delivered
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on May 17, 2023

RELATED IDEAS

(TPFUG) Support generating a compiler warning if iostream is included in a build

With GCC 7, including iostream results in a global object being instantiated regardless of whether it is actually used. This drives substantial (approx 5% measured) overhead at runtime.  GCC 4.6 included a specific mod to defer instantiation until actual use, but the mod was not carried forward to GCC 7 and having to continuously carry forward a mod like this in future compiler versions is not ideal.

Given inclusion of iostream when not even needed has such an impact on runtime CPU, we would like the lab to enhance tooling to support generation of a compiler warning if iostream is used in a build. This will allow us to scrutinize all usage and remove all unnecessary calls. The support should probably be disabled by default but should be easily enabled if a customer wishes to use it. If enabled, the support would need to offer a means (e.g. a macro) of overriding the warning so that cases that truly need iostream can be compiled RC=0.

Idea priority High
  • Guest
    Reply
    |     Jul 31, 2023
    This is available with z/TPF APAR PJ47102.

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