Re: [libgo, build] Use convenience libraries to create .gox files

[Ralf Wildenhues]

[ adding libtool-patches ]

* Rainer Orth wrote on Mon, Jan 31, 2011 at 03:54:29PM CET:
> GNU ld testing failed initially for the 64-bit multilib:
> 
> libtool: link: 
> /vol/gcc/obj/gcc-4.6.0-20110128/11-gcc-gas-gld-go/./gcc/collect-ld -r -o 
> crypto/libsubtle.o    --whole-archive crypto/.libs/libsubtle.a 
> --no-whole-archive
> /vol/gcc/bin/gld-2.21: Relocatable linking with relocations from format 
> elf64-x86-64-sol2 (sort/.libs/libsort.a(libsort.a.o)) to format 
> elf32-i386-sol2 (sort/libsort.o) is not supported
> make[7]: *** [sort/libsort.lo] Error 1
> 
> Ultimately, this turned out to be a libtool issue: it doesn't handle
> Solaris 2/x86 at all, and Solaris 2/SPARC with GNU ld is incomplete in
> that it doesn't account for the new *_sol2 emulations in gld 2.21.  All
> this second-guessing the compiler suggests to me that it's a bad idea to
> call the linker directly if gcc is in use.

I know libtool bashing is hitting an easy target, but IIRC we still had
user reports last year of (probably older) GCC installations where
partial linking did not work when using the gcc driver, as opposed to
using ld directly (note! for partial linking).

Anyway, I'm applying your patch to upstream Libtool, as below.

Thanks,
Ralf

2011-02-01  Rainer Orth  <ro@...>  (tiny change)

        Fix LD setting for 64-bit Solaris 2/x86.
        * libltdl/m4/libtool.m4 (_LT_ENABLE_LOCK) [*-*-solaris*):
        Determine GNU ld options for 64-bit Solaris 2/x86.  Detect gld
        2.21 _sol2 emulations.

diff --git a/libltdl/m4/libtool.m4 b/libltdl/m4/libtool.m4
index 033c9a0..5cc027b 100644
--- a/libltdl/m4/libtool.m4
+++ b/libltdl/m4/libtool.m4
@@ -1374,14 +1374,27 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
     CFLAGS="$SAVE_CFLAGS"
   fi
   ;;
-sparc*-*solaris*)
+*-*solaris*)
   # Find out which ABI we are using.
   echo 'int i;' > conftest.$ac_ext
   if AC_TRY_EVAL(ac_compile); then
     case `/usr/bin/file conftest.o` in
     *64-bit*)
       case $lt_cv_prog_gnu_ld in
-      yes*) LD="${LD-ld} -m elf64_sparc" ;;
+      yes*)
+        case $host in
+        i?86-*-solaris*)
+          LD="${LD-ld} -m elf_x86_64"
+          ;;
+        sparc*-*-solaris*)
+          LD="${LD-ld} -m elf64_sparc"
+          ;;
+        esac
+        # GNU ld 2.21 introduced _sol2 emulations.  Use them if available.
+        if ${LD-ld} -V | grep _sol2 >/dev/null 2>&1; then
+          LD="${LD-ld}_sol2"
+        fi
+        ;;
       *)
        if ${LD-ld} -64 -r -o conftest2.o conftest.o >/dev/null 2>&1; then
          LD="${LD-ld} -64"