cc-wrapper: -march= is not allowed on powerpc #205242
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Gcc does not allow `-march=` on PowerPC: https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/RS_002f6000-and-PowerPC-Options.html#RS_002f6000-and-PowerPC-Options Instead, `-mcpu=` should be used to set the minimum instruction set and `-mtune=` is used to optimize instruction scheduling for a specific processor. Both flags take the same set of valid values, which includes `native`. This commit causes `isGccArchSupported` to return `false` for PowerPC targets so we never pass an `-march=` flag, since that will always be rejected by gcc.
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Description of changes
Gcc does not allow
-march=on PowerPC:https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/RS_002f6000-and-PowerPC-Options.html#RS_002f6000-and-PowerPC-Options
Instead,
-mcpu=should be used to set the minimum instruction set and-mtune=is used to optimize instruction scheduling for a specific processor. Both flags take the same set of valid values, which includesnative.This commit causes
isGccArchSupportedto returnfalsefor PowerPC targets so we never pass an-march=flag, since that will always be rejected by gcc.Things done