Add a snapshot of build32.sh for amd64 systems. The readme and comments

describe the (severe) restrictions and future plans.

2 files changed, 66 insertions, 0 deletions

diff --git a/tools/lib32/README b/tools/lib32/README
new file mode 100644
index 0000000..d430cc2
--- /dev/null
+++ b/tools/lib32/README
@@ -0,0 +1,15 @@
+# $FreeBSD$
+
+This script is a stopgap for building tuned 32 bit (but i386 ABI compatable)
+libraries for amd64 systems.  We *know* we have things like CMOV, SSE2 etc
+so take advantage of it.
+
+At some point libc would be configured to use the fast syscall/sysret
+instructions (instead of int 0x80) since we have a known minimum feature
+set and don't have to do runtime tests for it.
+
+libpthread could use the amd64 sysarch syscalls for setting %fs/%gs
+since we don't have USER_LDT.  This would be a heck of a lot easier than
+trying to run a real i386-built libc/libpthread.
+
+Again, this hack is a stopgap until something is integrated into world.
diff --git a/tools/lib32/build32.sh b/tools/lib32/build32.sh
new file mode 100644
index 0000000..f6eed16
--- /dev/null
+++ b/tools/lib32/build32.sh
@@ -0,0 +1,51 @@
+#! /bin/sh
+# $FreeBSD$
+#
+# This script is for running on a self-hosted amd64 machine, with an up-to-date
+# world and toolchain etc.  ie: the installed world is assumed to match the sources.
+# It is rude, crude and brutal.  But its the only option for now.
+#
+# Its purpose is to build a 32 bit library set and a ld-elf32.so.1.
+
+# XXX beware.. some of the library targets have no way to disable
+# XXX installation of includes.  ie: it will re-install some files in
+# XXX /usr/include for you.
+
+mkdir /lib32
+mkdir /usr/lib32
+mkdir /usr/local/lib32
+mkdir /usr/X11R6/lib32
+
+# Set up an obj tree
+chflags -R noschg /tmp/i386
+rm -rf /tmp/i386
+
+CCARGS="-m32 -march=athlon-xp -msse2 -mfancy-math-387 -I/tmp/i386/root/usr/include -L/usr/lib32 -B/usr/lib32"
+CXXARGS="-m32 -march=athlon-xp -msse2 -mfancy-math-387 -I/tmp/i386/root/usr/include/c++/3.3 -I/tmp/i386/root/usr/include -L/usr/lib32 -B/usr/lib32"
+
+# and a place to put the alternate include tree into.
+mkdir -p /tmp/i386/root
+make -s MAKEOBJDIRPREFIX=/tmp/i386 DESTDIR=/tmp/i386/root MACHINE_ARCH=i386 hierarchy
+
+# Now build includes
+make -s MAKEOBJDIRPREFIX=/tmp/i386 DESTDIR=/tmp/i386/root MACHINE_ARCH=i386 obj
+make -s MAKEOBJDIRPREFIX=/tmp/i386 DESTDIR=/tmp/i386/root MACHINE_ARCH=i386 includes
+
+# libncurses needs a build-tools pass first.  I wish build-tools was a recursive target.
+(cd lib/libncurses; make -s MAKEOBJDIRPREFIX=/tmp/i386 build-tools)
+
+# Now the libraries.  This doesn't work for gnuregex yet. hence -k.
+# libbind is just an internal target, ignore it.
+make -s -DNO_BIND -DNOMAN -DNODOC -DNOINFO MAKEOBJDIRPREFIX=/tmp/i386 LIBDIR=/usr/lib32 SHLIBDIR=/usr/lib32 MACHINE_ARCH=i386 CC="cc $CCARGS" CXX="c++ $CXXARGS" LD="ld -m elf_i386_fbsd -Y P,/usr/lib32" -k libraries
+
+# Hack to fix gnuregex which does hacks to the -I path based on $DESTDIR.  But, we cannot
+# use DESTDIR during the libraries target, because we're just using alternate includes, not
+# an alternate install directory.
+(cd gnu/lib/libregex; make -s -DNOMAN -DNODOC -DNOINFO MAKEOBJDIRPREFIX=/tmp/i386 LIBDIR=/usr/lib32 SHLIBDIR=/usr/lib32 MACHINE_ARCH=i386 CC="cc -I/tmp/i386/root/usr/include/gnu $CCARGS" CXX="c++ $CXXARGS" LD="ld -m elf_i386_fbsd -Y P,/usr/lib32" all install)
+
+# and now that we have enough libraries, build ld-elf32.so.1
+cd libexec/rtld-elf
+make -s -DNOMAN -DNODOC -DNOINFO PROG=ld-elf32.so.1 MAKEOBJDIRPREFIX=/tmp/i386 LIBDIR=/usr/lib32 SHLIBDIR=/usr/lib32 MACHINE_ARCH=i386 CC="cc $CCARGS -DCOMPAT_32BIT" LD="ld -m elf_i386_fbsd -Y P,/usr/lib32" obj
+make -s -DNOMAN -DNODOC -DNOINFO PROG=ld-elf32.so.1 MAKEOBJDIRPREFIX=/tmp/i386 LIBDIR=/usr/lib32 SHLIBDIR=/usr/lib32 MACHINE_ARCH=i386 CC="cc $CCARGS -DCOMPAT_32BIT" LD="ld -m elf_i386_fbsd -Y P,/usr/lib32" depend
+make -s -DNOMAN -DNODOC -DNOINFO PROG=ld-elf32.so.1 MAKEOBJDIRPREFIX=/tmp/i386 LIBDIR=/usr/lib32 SHLIBDIR=/usr/lib32 MACHINE_ARCH=i386 CC="cc $CCARGS -DCOMPAT_32BIT" LD="ld -m elf_i386_fbsd -Y P,/usr/lib32" 
+make -s -DNOMAN -DNODOC -DNOINFO PROG=ld-elf32.so.1 MAKEOBJDIRPREFIX=/tmp/i386 LIBDIR=/usr/lib32 SHLIBDIR=/usr/lib32 MACHINE_ARCH=i386 CC="cc $CCARGS -DCOMPAT_32BIT" LD="ld -m elf_i386_fbsd -Y P,/usr/lib32" install