For microperl, add uconfig64.sh, with values suitable for an LP64 platform.

Add instructions on how to use it to README.micro.

There's rather too much size-specific in perl's configuration to make it viable
to have a single uconfig.sh that will work "properly" on both LP32 and LP64
platforms. It seems best to ship the default as LP32 (which is correct for
Win32 (although I don't know if microperl yet builds on Win32)), and provide
just a config.sh file for LP64, as most (all?) 64 bit *nix platforms are LP64,
and can run the shell commands to generate a uconfig.h from it.

(Win64 is LLP64, so uconfig64.sh isn't going to be right for it, so the
inability of Win64 to generate uconfig.h from uconfig64.sh isn't a problem)

1 files changed, 14 insertions, 3 deletions

diff --git a/README.micro b/README.micro
index 412b95287b..c6597323c1 100644
--- a/README.micro
+++ b/README.micro
@@ -20,16 +20,27 @@ If you are still reading this and you are itching to try out microperl:
 
 	make -f Makefile.micro
 
+The defaults assume a little endian LP32 platform - ie long and pointers are
+32 bits, so sizeof(long) and sizeof(void *) are 4
+If your platform is little endian LP64 - ie long and pointers are 64 bits,
+sizeof(long) and sizeof(void *) are 8, then you first need to run
+
+	make -f Makefile.micro regen_uconfig64
+
+to generate a suitable uconfig.h
+
 If you make changes to uconfig.sh, run
 
 	make -f Makefile.micro regen_uconfig
 
-to regenerate uconfig.h.  If your compilation platform is not 32-bit
-little-endian (like x86), you might want to try
+to regenerate uconfig.h.  (or regen_uconfig64 if you're editing uconfig64.sh)
+
+
+If neither of the above default configs work on your platform, you might want
+to try
 
 	make -f Makefile.micro patch_uconfig
 
 *before* the "make -f Makefile.micro".  This tries to minimally patch
 the uconfig.sh using your *current* Perl so that your microperl has
 the correct basic types and sizes and byteorder.
-