README.TXT
1Upgrading Libtool
2===============================================================================
3
4If 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
2510. 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.
3011. Run AutoRegen.sh to get the new macros into configure script
3112. If there are any warnings from AutoRegen.sh, go to step 9.
3213. Rebuild LLVM, making sure it reconfigures
3314. Test the JIT which uses libltdl
3415. If it all works, only THEN commit the changes.
35
36Upgrading autoconf
37===============================================================================
38
39If 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