[Bug binutils/14698] New: ar, nm and ranlib don't use gcc's liblto_plugin.so in BINDIR/../lib/bfd-plugins automatically

[markus at trippelsdorf dot de]

http://sourceware.org/bugzilla/show_bug.cgi?id=14698



             Bug #: 14698

           Summary: ar, nm and ranlib don't use gcc's liblto_plugin.so in

                    BINDIR/../lib/bfd-plugins automatically

           Product: binutils

           Version: 2.24 (HEAD)

            Status: NEW

          Severity: normal

          Priority: P2

         Component: binutils

        AssignedTo: address@hidden

        ReportedBy: address@hidden

    Classification: Unclassified





ar, nm and ranlib use the LLVMgold.so plugin automatically,

it it is found in BINDIR/../lib/bfd-plugins.

(/usr/x86_64-pc-linux-gnu/binutils-bin/lib/bfd-plugins on my system)

Unfortunately gcc's liblto_plugin is loaded automatically.



address@hidden test % cat a.c

#include <stdio.h>



extern void foo1(void);

extern void foo4(void);



void foo2(void) {

  printf("Foo2\n");

}



void foo3(void) {

  foo4();

}



int main(void) {

  foo1();

}



address@hidden test % clang -flto -c a.c -o a.o



address@hidden test % nm a.o

nm: a.o: File format not recognized



address@hidden test % sudo cp /usr/local/lib64/LLVMgold.so

/usr/x86_64-pc-linux-gnu/binutils-bin/lib/bfd-plugins



address@hidden test % nm a.o

         U foo1

00000000 T foo2

00000000 T foo3

         U foo4

00000000 T main

         U printf



address@hidden test % sudo rm

/usr/x86_64-pc-linux-gnu/binutils-bin/lib/bfd-plugins/LLVMgold.so



address@hidden test % gcc -fno-fat-lto-objects -flto a.c -c -o a.o



address@hidden test % nm a.o

0000000000000001 C __gnu_lto_slim

0000000000000001 C __gnu_lto_v1



address@hidden test % sudo cp

/usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.0/liblto_plugin.so.0.0.0

/usr/x86_64-pc-linux-gnu/binutils-bin/lib/bfd-plugins



address@hidden test % nm a.o

0000000000000001 C __gnu_lto_slim

0000000000000001 C __gnu_lto_v1



It would output the following if the gcc lto-plugin would be loaded 

automatically:



address@hidden test % nm a.o

         U foo1

00000000 T foo2

00000000 T foo3

         U foo4

00000000 T main



A fix was posted at:

http://sourceware.org/ml/binutils/2012-10/msg00080.html



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