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A recent change in the LTO streaming arrangement means that it is now possible for machopic_select_section () to be called with a NULL value for DECL_SIZE_TYPE - corresponding to an incomplete or not-yet- laid out type. When section anchors are present, and we are generating assembler, we normally need to know the object size when choosing the section, since zero-sized objects must be placed in sections that forbid section anchors. In the current circumstance, the objective of the earlier streaming of this data is to allow nm to determine BSS c.f. Data symbols (when used with the LTO plugin). Since Darwin does not yet make use of the plugin this fix is a bit of future-proofing. We now emit the 'generic' section for the decl (absent knowing its size) - which will still be correct in determining the BSS c.f. Data case. gcc/ChangeLog: 2020-03-21 Iain Sandoe <iain@sandoe.co.uk> PR lto/94237 * config/darwin.c (darwin_mergeable_constant_section): Collect section anchor checks into the caller. (machopic_select_section): Collect section anchor checks into the determination of 'effective zero-size' objects. When the size is unknown, assume it is non-zero, and thus return the 'generic' section for the DECL.
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