Package: gcc-4.2 Version: 4.2-20070627-1 Severity: normal Tags: patch On Thu, 28 Jun 2007 14:47:55 +0200 Martin Michlmayr <tbm@cyrius.com> wrote: > Throughout the development of GCC 4.2, we regularly recompiled the > entire Debian archive with development snapshots of GCC to make sure > that we'd end up with a reliable compiler. We have done regular > rebuilds on IA64 and AMD64, and we have tested almost every > architecture at some point during the development phase of 4.2 (the > exception being hppa and m68k, as well as non-Linux platforms). We > now have a compiler with relatively few known issues. One issue that arose during DebConf7 relates to an upstream behaviour of gcc that is not working inside the debian packaging code. Emdebian has been building cross-compiler toolchains for some time but in order to be able to build all Emdebian packages from source, we need to be able to cross build gcc, not to provide a cross compiler but to provide some core libraries - specifically libgcc1 and libstsdc++6-foo - cross built for a different host. e.g. Build=amd64|i386|powerpc Host=arm Target=arm compared to build=amd64|i386|powerpc host=amd64|i386|powerpc target=arm for a standard cross-compiler. As host==target this isn't a full canadian cross, more of a reverse cross. A normal arm-linux-gnu-gcc etc. toolchain is used to build these packages. The attached patches to debian/rules.defs and debian/rules2 provide support for these builds as well as outline support for a full canadian cross build. --- System information. --- Architecture: amd64 Kernel: Linux 2.6.21-1-amd64 Debian Release: lenny/sid 500 unstable www.linux.codehelp.co.uk 500 unstable www.emdebian.org 500 unstable ftp.uk.debian.org --- Package information. --- Depends (Version) | Installed ======================================-+-====================== gcc-4.2-base (= 4.2-20070627-1) | 4.2-20070627-1 cpp-4.2 (= 4.2-20070627-1) | 4.2-20070627-1 binutils (>= 2.17cvs20070426) | 2.17cvs20070426-8 libgcc1 (>= 1:4.2-20070627-1) | 1:4.2-20070627-1 libgomp1 (>= 4.2-20070627-1) | 4.2-20070627-1 libc6 (>= 2.5-5) | 2.5-11 -- Neil Williams ============= http://www.data-freedom.org/ http://www.nosoftwarepatents.com/ http://www.linux.codehelp.co.uk/
--- gcc-4.2.old/debian/rules.defs 2007-06-29 12:34:25.000000000 +0100 +++ gcc-4.2.cross/debian/rules.defs 2007-06-29 16:10:04.000000000 +0100 @@ -66,6 +66,28 @@ endif # --------------------------------------------------------------------------- +# full canadian +# typical cross-compiler +# reverse cross (built to run on the target) +# native +# +# build != host && host == target : reverse cross (REVERSE_CROSS == yes) +# build == host && host != target : typical cross (DEB_CROSS == yes) +# build != host && host != target : canadian (DEB_CROSS == yes) +# build == host && host == target : native +ifneq ($(DEB_BUILD_GNU_TYPE), $(DEB_HOST_GNU_TYPE)) + ifneq ($(DEB_HOST_GNU_TYPE), $(DEB_TARGET_GNU_TYPE)) + DEB_CROSS = yes + else + REVERSE_CROSS = yes + endif + else + ifneq ($(DEB_HOST_GNU_TYPE), $(DEB_TARGET_GNU_TYPE)) + DEB_CROSS = yes + endif +endif + +# --------------------------------------------------------------------------- # which binary packages are built? # cross compiler support. If GCC_TARGET is set, then it's the architecture @@ -75,8 +97,7 @@ $(error GCC_TARGET value "$(GCC_TARGET)" is not a valid Debian architecture) endif -ifneq ($(DEB_HOST_GNU_TYPE),$(DEB_TARGET_GNU_TYPE)) - DEB_CROSS = yes +ifdef DEB_CROSS # TP: Target Prefix. Used primarily as a prefix for cross tool # names (e.g. powerpc-linux-gcc). # TS: Target Suffix. Used primarily at the end of cross compiler @@ -700,6 +721,9 @@ ifdef DEB_CROSS with_check := disabled for cross compiler package endif +ifdef REVERSE_CROSS + with_check := disabled for reverse cross build +endif check_no_systems := hurd-i386 ifneq (, $(filter $(DEB_TARGET_GNU_SYSTEM),$(check_no_systems))) with_check := disabled for $(DEB_TARGET_GNU_SYSTEM)
--- gcc-4.2.old/debian/rules2 2007-06-29 12:34:25.000000000 +0100
+++ gcc-4.2.cross/debian/rules2 2007-06-29 16:03:57.000000000 +0100
@@ -535,7 +535,9 @@
$(build_stamp): $(configure_stamp) $(build_locale_stamp)
dh_testdir
rm -f bootstrap-protocol
+# DEB_CROSS is never set if REVERSE_CROSS is set and vice-versa.
ifndef DEB_CROSS
+ifndef REVERSE_CROSS
ifeq ($(with_java),yes)
ifeq ($(with_native_ecj),yes)
: # prepare the standalone ecj jar
@@ -608,6 +610,7 @@
) 2>&1 | tee bootstrap-protocol
s=`cat status`; rm -f status; test $$s -eq 0
endif
+endif
-chmod 755 $(srcdir)/contrib/warn_summary
if [ -x $(srcdir)/contrib/warn_summary ]; then \
rm -f bootstrap-summary; \
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