[LLVMdev] Instrumentation with liblto and gold

[Sangmin Park]

Hi John,

Thank you for your advice.
LIBS and LDFLAGS work for the configure script,
but they gave errors in the make stage for apache and mysql.

I used either of the following ones with other flags:
- export LIBS="-L/home/sangmin/Dropbox/Falcon/bin/ -ldummy"
- export LDFLAGS="-L/home/sangmin/Dropbox/Falcon/bin/ -ldummy"

Here are the error messages:

Compile error (apache):
make[3]: Entering directory `/home/sangmin/Concurrency/apache/srclib/apr'
/bin/bash /home/sangmin/Concurrency/apache/srclib/apr/libtool --silent
--mode=link llvm-gcc -use-gold-plugin -pthread -O4 -DHAVE_CONFIG_H -DLINUX=2
-D_REENTRANT -D_GNU_SOURCE -I./include -I../include -version-info 9:5:9
-L/home/sangmin/Dropbox/Falcon/bin/ -ldummy -o libapr-0.la -rpath
/home/sangmin/Concurrency/apache-25520-llvm//lib strings/apr_cpystrn.lo
strings/apr_fnmatch.lo strings/apr_snprintf.lo <skip>
collect2: ld terminated with signal 6 [Aborted]
ld:
/home/sangmin/Dropbox/Falcon/src/llvm-2.7/include/llvm/Support/Casting.h:200:
typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X =
llvm::Instruction, Y = llvm::Value*]: Assertion `isa<X>(Val) && "cast<Ty>()
argument of incompatible type!"' failed.
Stack dump:
0. Running pass 'Function Pass Manager' on module 'ld-temp.o'.
1. Running pass 'Function pass' on function
'@apr_proc_other_child_refresh_all'

Compile error (mysql):
ake[2]: Entering directory `/home/sangmin/Concurrency/mysql/libmysql'
/bin/bash ../libtool --mode=link llvm-gcc -use-gold-plugin  -O3 -DDBUG_OFF
-O4   -L/home/sangmin/Dropbox/Falcon/bin/ -ldummy -rdynamic  -o conf_to_src
 conf_to_src.o  -lz -lcrypt -lnsl -lm
llvm-gcc -use-gold-plugin -O3 -DDBUG_OFF -O4 -rdynamic -o conf_to_src
conf_to_src.o  -L/home/sangmin/Dropbox/Falcon/bin/ -ldummy -lz -lcrypt -lnsl
-lm
collect2: ld terminated with signal 6 [Aborted]
ld:
/home/sangmin/Dropbox/Falcon/src/llvm-2.7/include/llvm/Support/Casting.h:200:
typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X =
llvm::Instruction, Y = llvm::Value*]: Assertion `isa<X>(Val) && "cast<Ty>()
argument of incompatible type!"' failed.
Stack dump:
0. Running pass 'Function Pass Manager' on module 'ld-temp.o'.
1. Running pass 'Function pass' on function '@print_arrays_for'

Any thoughts?

Thanks,
Sangmin

On Thu, Mar 24, 2011 at 7:26 PM, John Criswell <criswell at illinois.edu>wrote:

> On 3/24/11 6:23 PM, Sangmin Park wrote:
>
>> Hi,
>>
>> I need advice in instrumenting programs using liblto and gold plugin.
>> Specifically, I added my pass in tools/lto/LTOCodeGenerator.cpp.
>> My pass inserts functions (myLoad and myStore) for some load and store
>> instructions.
>> The functions exist in a library file.
>>
>> I found that the approach works for the example in the link:
>> http://llvm.org/docs/GoldPlugin.html
>> $ llvm-gcc -flto a.c -c -o a.o
>> $ ar q a.a a.o
>> $ llvm-gcc b.c -c -o b.o
>> $ llvm-gcc -use-gold-plugin a.a b.o -L<path_to_my_lib> -l<my_lib> -o main
>>
>> I also found that I can compile large programs (apache and mysql) with
>> gold plugin.
>> Here is the command:
>> $ export CC="llvm-gcc -use-gold-plugin"; export CXX="llvm-g++
>> -use-gold-plugin"; export RANLIB=/bin/true; export CFLAGS="-O4";
>> $ ./configure
>> $ make
>> $ make install
>>
>> However, I cannot compile large programs with modified liblto and gold
>> plugin.
>> That is because I have to specify the path to my library containing myLoad
>> and myStore in configure and makefile.
>>
>> Is there any fancy way to handle this problem?
>>
>
> The configure scripts might recognize the LIBS and LDFLAGS variables and
> add them to the linker options as it does for CFLAGS above.
>
> -- John T.
>
>
>> Thanks in advance.
>>
>> Sangmin
>>
>
>
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