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README.TXT

      1 Upgrading Libtool
      2 ===============================================================================
      3 
      4 If you are in the mood to upgrade libtool, you must do the following:
      5 
      6  1. Get the new version of libtool and put it in <SRC>
      7  2. configure/build/install libtool with --prefix=<PFX>
      8  3. Copy <SRC>/ltdl.m4 to llvm/autoconf/m4
      9  4. Copy <PFX>/share/aclocal/libtool.m4 to llvm/autoconf/m4/libtool.m4
     10  5. Copy <PFX>/share/libtool/ltmain.sh to llvm/autoconf/ltmain.sh
     11  6. Copy <PFX>/share/libtool/libltdl/ltdl.c to llvm/lib/System
     12  7. Copy <PFX>/share/libtool/libltdl/ltdl.h to llvm/lib/System
     13  8. Edit the ltdl.h file to #include "llvm/Config/config.h" at the very top. You
     14     might also need to resolve some compiler warnings (typically about
     15     comparison of signed vs. unsigned values). But, you won't find out about 
     16     those until you build LLVM (step 13).
     17  9. Edit the llvm/autoconf/m4/libtool.m4 file so that:
     18     a) in AC_PROB_LIBTOOL macro, the value of LIBTOOL is set to
     19        $(top_builddir)/mklib, not $(top_builddir)/libtool
     20     b) in AC_LIBTOOL_SETUP macro, the variable default_ofile is set to 
     21        "mklib" instead of "libtool"
     22     c) s/AC_ENABLE_SHARED_DEFAULT/enable_shared_default/g
     23     d) s/AC_ENABLE_STATIC_DEFAULT/enable_static_default/g
     24     e) s/AC_ENABLE_FAST_INSTALL_DEFAULT/enable_fast_install_default/g
     25 10. Run "autoupdate libtool.m4 ltdl.m4" in the llvm/autoconf/m4 directory.
     26     This should correctly update the macro definitions in the libtool m4 
     27     files to match the version of autoconf that LLVM uses. This converts
     28     AC_HELP_STRING to AS_HELP_STRING and AC_TRY_LINK to AC_LINK_IFELSE, amongst
     29     other things. You may need to manually adjust the files.
     30 11. Run AutoRegen.sh to get the new macros into configure script
     31 12. If there are any warnings from AutoRegen.sh, go to step 9.
     32 13. Rebuild LLVM, making sure it reconfigures
     33 14. Test the JIT which uses libltdl
     34 15. If it all works, only THEN commit the changes.
     35 
     36 Upgrading autoconf
     37 ===============================================================================
     38 
     39 If you are in the mood to upgrade autoconf, you should:
     40 
     41  1. Consider not upgrading.
     42  2. No really, this is a hassle, you don't want to do it.
     43  3. Get the new version of autoconf and put it in <SRC>
     44  4. configure/build/install autoconf with --prefix=<PFX>
     45  5. Run autoupdate on all the m4 macros in llvm/autoconf/m4
     46  6. Run autoupdate on llvm/autoconf/configure.ac
     47  7. Regenerate configure script with AutoRegen.sh
     48  8. If there are any warnings from AutoRegen.sh, fix them and go to step 7.
     49  9. Test, test, test.
     50