Fangrui Song 9d53db2aa0 [Support] Allow FileOutputBuffer::create to create an empty file ...

Size==0 triggers `assert(Size != 0)` in mapped_file_region::init.
I plan to use an empty file in D79339 (llvm-objcopy --dump-section).

According to POSIX, "If len is zero, mmap() shall fail and no mapping
shall be established." Just specialize case Size=0 to use
createInMemoryBuffer.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D79338

2020-05-05 08:11:58 -07:00

6.3 KiB

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