[LLVMdev] comparing .o files from different build trees

[Reed Kotler]

I've realized that it's necessary to build the recursed compiler in the 
same directory as it's previous generation (after moving the previous 
somewhere else) before doing the diff since the names of various 
generated files are embedded in the .o somtimes.

For example:

rkotler at mipsswbrd002:~/slave/recurse2be/build$ diff ../../tmp/1 ../../tmp/2
2c2
< ./tools/clang/lib/AST/Release+Asserts/ASTDumper.o:     file format 
elf32-tradbigmips
---
 > 
../../recurse3be/build/tools/clang/lib/AST/Release+Asserts/ASTDumper.o: 
     file format elf32-tradbigmips
11404c11404
<  2510 652f7265 63757273 65326265 2f627569  e/recurse2be/bui
---
 >  2510 652f7265 63757273 65336265 2f627569  e/recurse3be/bui
12379c12379
<  6200 76652f72 65637572 73653262 652f6275  ve/recurse2be/bu
---
 >  6200 76652f72 65637572 73653362 652f6275  ve/recurse3be/bu
rkotler at mipsswbrd002:~/slave/recurse2be/build$

On 04/03/2014 10:43 AM, reed kotler wrote:
> I'm trying to write a script for checking whether the compiler recursed
> properly.
>
> rkotler at mipsswbrd002:~/slave/recurse3be/build$ find . -name "*.o" -exec
> cmp '{}' ../../recurse2be/build/'{}'  \; |& tee foo.txt
>
> Is anyone else doing this?
>
> There 2 compilers, recurse 2 and recurse3 that in principle should be
> identical.
>
> Obviously if there is date and time information, miscompares can occur.
>
>
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