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[COFF] Link crtend.o as the last object file

Authored by mstorsjo on Apr 15 2019, 3:57 AM.

Description

[COFF] Link crtend.o as the last object file

When faced with command line options such as "crtbegin.o appmain.o
-lsomelib crtend.o", GNU ld pulls in all necessary object files from
somelib before proceeding to crtend.o.

LLD operates differently, only loading object files from any
referenced static libraries after processing all input object files.

This uses a similar hack as in the ELF linker. Here, it moves crtend.o
to the end of the vector of object files. This makes sure that
terminator chunks for sections such as .eh_frame gets ordered last,
fixing DWARF exception handling for libgcc and gcc's crtend.o.

Differential Revision: https://reviews.llvm.org/D60628

llvm-svn: 358394

Details