X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=INSTALL;h=f6801f759f4b07e3bc8fdbb35c9d3e3fda59000b;hb=4e644a1e85f1b37458ab905c727b0eaa69f0e08f;hp=373a8600bf9fcce7e4c4a4c51b5a7596375c0b71;hpb=03739d21c9232cc6b91282bb1936392275192e80;p=p5sagit%2Fp5-mst-13.2.git diff --git a/INSTALL b/INSTALL index 373a860..f6801f7 100644 --- a/INSTALL +++ b/INSTALL @@ -1737,6 +1737,110 @@ break utime() so that over NFS the timestamps do not get changed =back +=head2 Cross-compilation + +Starting from Perl 5.8 Perl has the beginnings of cross-compilation +support. What is known to work is running Configure in a +cross-compilation environment and building the miniperl executable. +What is known not work work is building the perl executable because +that would require building extensions: Dynaloader statically and +File::Glob dynamically, for extensions one needs MakeMaker and +MakeMaker is not yet cross-compilation aware, and neither is +the main Makefile. + +Since the functionality is so lacking, it must be considered +highly experimental. It is so experimental that it is not even +mentioned during an interactive Configure session, a direct comand +line invocation (detailed shortly) is required to access the +functionality. + + NOTE: Perl is routinely built using cross-compilation + in the EPOC environment but the solutions from there + can't directly be used elsewhere. + +The one environment where cross-compilation has successfully been used +as of this writing is the Compaq iPAQ running ARM Linux. The build +host was Intel Linux, the networking setup was PPP + SSH. The exact +setup details are beyond the scope of this document, see +http://www.handhelds.org/ for more information. + +To run Configure in cross-compilation mode the basic switch is +C<-Dusecrosscompile>. + + sh ./Configure -des -Dusecrosscompile -D... + +This will make the cpp symbol USE_CROSS_COMPILE and the %Config +symbol C available. + +During the Configure and build, certain helper scripts will be created +into the Cross/ subdirectory. The scripts are used to execute a +cross-compiled executable, and to transfer files to and from the +target host. The execution scripts are named F and the +transfer scripts F and F. The part after the dash is +the method to use for remote execution and transfer: by default the +methods are B and B, thus making the scripts F, +F, and F. + +To configure the scripts for a target host and a directory (in which +the execution will happen and which is to and from where the transfer +happens), supply Configure with + + -Dtargethost=so.me.ho.st -Dtargetdir=/tar/get/dir + +The targethost is what e.g. ssh will use as the hostname, the targetdir +must exist (the scripts won't create it), the targetdir defaults to /tmp. +You can also specify a username to use for ssh/rsh logins + + -Dtargetuser=luser + +but in case you don't, "root" will be used. + +Because this is a cross-compilation effort, you will also need to specify +which target environment and which compilation environment to use. +This includes the compiler, the header files, and the libraries. +In the below we use the usual settings for the iPAQ cross-compilation +environment: + + -Dtargetarch=arm-linux + -Dcc=arm-linux-gcc + -Dusrinc=/skiff/local/arm-linux/include + -Dincpth=/skiff/local/arm-linux/include + -Dlibpth=/skiff/local/arm-linux/lib + +If the name of the C has the usual GNU C semantics for cross +compilers, that is, CPU-OS-gcc, the names of the C, C, and +C will also be automatically chosen to be CPU-OS-ar and so on. +(The C requires more thought and will be chosen later by Configure +as appropriate.) Also, in this case the incpth, libpth, and usrinc +will be guessed by Configure (unless explicitly set to something else, +in which case Configure's guesses with be appended). + +In addition to the default execution/transfer methods you can also +choose B for execution, and B or B for transfer, +for example: + + -Dtargetrun=rsh -Dtargetto=rcp -Dtargetfrom=cp + +Putting it all together: + + sh ./Configure -des -Dusecrosscompile \ + -Dtargethost=so.me.ho.st \ + -Dtargetdir=/tar/get/dir \ + -Dtargetuser=root \ + -Dtargetarch=arm-linux \ + -Dcc=arm-linux-gcc \ + -Dusrinc=/skiff/local/arm-linux/include \ + -Dincpth=/skiff/local/arm-linux/include \ + -Dlibpth=/skiff/local/arm-linux/lib \ + -D... + +or if you are happy with the defaults + + sh ./Configure -des -Dusecrosscompile \ + -Dtargethost=so.me.ho.st \ + -Dcc=arm-linux-gcc \ + -D... + =head1 make test This will run the regression tests on the perl you just made. If @@ -2206,6 +2310,3 @@ If you are distributing a modified version of perl (perhaps as part of a larger package) please B modify these installation instructions and the contact information to match your distribution. -=head1 LAST MODIFIED - -$Id: INSTALL,v 1.58 1999/07/23 14:43:00 doughera Exp $