9295723079
Setup .TOC. to point to the same place for all objects. Today, the linker assumes all call relocations can use the local function entry point of imported object files. This requires a consistent pointer across all objects. This intentionally computes the .TOC. pointer in all linking configurations. In some cases the .TOC. is not used today (e.g linking position-dependent go only code). It is harmless and simple to compute in all cases, so just do it for easier maintenance. Notably, .TOC. is used in some cases when static linking is requested on ppc64le/linux: * Position-independent C code using a PC-rel relocation against .TOC.. cgo generated C object files are usually compiled PIC even if the go binary itself is not. * Anything which causes PLT stub generation. The stubs always generate a .TOC. relative relocation. * The race detector. Today, this links in an externally compiled archive which contains position-independent object files. Similarly, position-independent linking is always punted to the external linker on ppc64 today. Updates #21961 Fixes #15409 Change-Id: Ifd8294b9249e16ba8b92eaf876d15d162f9c61fd Reviewed-on: https://go-review.googlesource.com/c/go/+/304458 Reviewed-by: Cherry Mui <cherryyz@google.com> Trust: Lynn Boger <laboger@linux.vnet.ibm.com> |
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