llvm-6502/test/Archive/README.txt
Rafael Espindola 250bfb1745 Remove the LLVM specific archive index.
Archive files (.a) can have a symbol table indicating which object
files in them define which symbols. The purpose of this symbol table
is to speed up linking by allowing the linker the read only the .o
files it is actually going to use instead of having to parse every
object's symbol table.

LLVM's archive library currently supports a LLVM specific format for
such table. It is hard to see any value in that now that llvm-ld is
gone:

* System linkers don't use it: GNU ar uses the same plugin as the
linker to create archive files with a regular index. The OS X ar
creates no symbol table for IL files, I assume the linker just parses
all IL files.

* It doesn't interact well with archives having both IL and native objects.

* We probably don't want to be responsible for yet another archive
format variant.

This patch then:

* Removes support for creating and reading such index from lib/Archive.
* Remove llvm-ranlib, since there is nothing left for it to do.

We should in the future add support for regular indexes to llvm-ar for
both native and IL objects. When we do that, llvm-ranlib should be
reimplemented as a symlink to llvm-ar, as it is equivalent to "ar s".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184019 91177308-0d34-0410-b5e6-96231b3b80d8
2013-06-14 23:25:53 +00:00

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test/Regression/Archive
=======================
This directory contains various tests of llvm-ar and to ensure
compatibility reading other ar(1) formats. It also provides a basic
functionality test for these tools.
There are four archives accompanying these tests:
GNU.a - constructed on Linux with GNU ar
MacOSX.a - constructed on Mac OS X with its native BSD4.4 ar
SVR4.a - constructed on Solaris with /usr/ccs/bin/ar
xpg4.a - constructed on Solaris with /usr/xpg4/bin/ar
Each type of test is run on each of these archive files. These archives each
contain four members:
oddlen - a member with an odd lengthed name and content
evenlen - a member with an even lengthed name and content
IsNAN.o - a Linux native binary
very_long_bytecode_file_name.bc - LLVM bytecode file with really long name
These files test different aspects of the archiver that should cause failures
in llvm-ar if regressions are introduced.