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5460a16070
The _GLOBAL_OFFSET_TABLE_ in SysVr4 ELF is conventionally the base of the .got or .got.prel sections. Expressions such as _GLOBAL_OFFSET_TABLE_ - (.L1 +8) are used in assembler code to calculate offsets into the .got. At present MC outputs a R_ARM_REL32 with respect to the _GLOBAL_OFFSET_TABLE_ symbol, whereas gas outputs a R_ARM_BASE_PREL relocation with respect to the _GLOBAL_OFFSET_TABLE_ symbol. While both are correct the R_ARM_REL32 depends on the value of the _GLOBAL_OFFSET_TABLE_ symbol, wheras te R_ARM_BASE_PREL relocation is idependent of the symbol. The R_ARM_BASE_PREL is therefore slightly more robust to linker's that may not follow the conventional placement of _GLOBAL_OFFSET_TABLE_; for example LLD for some time defined _GLOBAL_OFFSET_TABLE_ to 0. Differential Revision: https://reviews.llvm.org/D46319