Bug#885428: gcc-6: Please add support for building internal libunwind
Source: gcc-6
Version: 6.4.0-11
Severity: normal
Tags: patch
User: debian-ia64@lists.debian.org
Usertags: ia64
Hi!
In order to be able to build a cross-compiler for ia64, we need
to be able to build and use the internal libunwind of gcc as the
external libunwind is not available for cross-builds.
I have added a new flag "with_unwind" which is set in debian/
rules.defs for the case when a cross-compiler is built for the
ia64 target architecture. This "with_unwind" is used in debian/
rules2 to pass either --with-system-libunwind or --with-newlib/
--without-headers to the configure script, the latter are necessary
to set inhibit_libc without which building the internal libunwind
is not possible.
I also added the internal libunwind to debian/rules.sonames and
debian/rules.d/binary-libgcc.mk to install the static and shared
libunwind libraries into libgcc if libgcc built as a shared library.
Unfortunately, I couldn't figure out a clean way to avoid the
double check for ia64-linux == $(DEB_TARGET_GNU_TYPE), but this
is the only way to make sure I'm not breaking anything outside
ia64.
With the patch applied, rebuilding src:gcc-6 provides a gcc-6-source
package which can be used successully to build the package
cross-toolchain-base-ports with the ia64 target enabled which in
turn will allow us to enable ia64 in gcc-7-cross-ports (after
this patch has been added to src:gcc-7 as well).
Thanks,
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - glaubitz@debian.org
`. `' Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
diff -Nru old/gcc-6-6.4.0/debian/rules2 new/gcc-6-6.4.0/debian/rules2
--- old/gcc-6-6.4.0/debian/rules2 2017-12-27 01:32:47.000000000 +0100
+++ new/gcc-6-6.4.0/debian/rules2 2017-12-27 01:59:43.873507119 +0100
@@ -560,7 +560,12 @@
endif
ifneq (,$(findstring ia64-linux,$(DEB_TARGET_GNU_TYPE)))
- CONFARGS += --with-system-libunwind
+ ifeq ($(with_unwind),yes)
+ CONFARGS += --with-newlib
+ CONFARGS += --without-headers
+ else
+ CONFARGS += --with-system-libunwind
+ endif
endif
ifneq (,$(findstring sh4-linux,$(DEB_TARGET_GNU_TYPE)))
diff -Nru old/gcc-6-6.4.0/debian/rules.d/binary-libgcc.mk new/gcc-6-6.4.0/debian/rules.d/binary-libgcc.mk
--- old/gcc-6-6.4.0/debian/rules.d/binary-libgcc.mk 2017-12-27 01:32:47.000000000 +0100
+++ new/gcc-6-6.4.0/debian/rules.d/binary-libgcc.mk 2017-12-27 01:10:46.587608383 +0100
@@ -265,6 +265,9 @@
$(if $(filter yes, $(with_qmath)),
$(call install_gcc_lib,libquadmath,$(QUADMATH_SONAME),$(1),$(2))
)
+ $(if $(filter yes, $(with_unwind)),
+ $(call install_gcc_lib,libunwind,$(UNWIND_SONAME),$(1),$(2))
+ )
endef
# do_gcc_devels(flavour)
diff -Nru old/gcc-6-6.4.0/debian/rules.defs new/gcc-6-6.4.0/debian/rules.defs
--- old/gcc-6-6.4.0/debian/rules.defs 2017-12-27 01:32:47.000000000 +0100
+++ new/gcc-6-6.4.0/debian/rules.defs 2017-12-27 00:51:30.727647629 +0100
@@ -1481,6 +1481,14 @@
endif
endif
+ # libunwind -----------------
+ ifneq (,$(findstring ia64-linux,$(DEB_TARGET_GNU_TYPE)))
+ with_unwind := no
+ ifeq ($(DEB_CROSS)-$(with_shared_libgcc),yes-yes)
+ with_unwind := yes
+ endif
+ endif
+
# Shared libgcc --------------------
ifneq ($(DEB_STAGE),stage1)
with_shared_libgcc := yes
diff -Nru old/gcc-6-6.4.0/debian/rules.sonames new/gcc-6-6.4.0/debian/rules.sonames
--- old/gcc-6-6.4.0/debian/rules.sonames 2017-12-27 01:32:47.000000000 +0100
+++ new/gcc-6-6.4.0/debian/rules.sonames 2017-12-27 01:09:51.136178371 +0100
@@ -38,6 +38,8 @@
echo TSAN_SONAME=$$v >> $$cache; \
v=`tail -1 $(srcdir)/libsanitizer/ubsan/libtool-version | cut -d: -f1`; \
echo UBSAN_SONAME=$$v >> $$cache; \
+ v=`tail -1 $(srcdir)/libunwind/unwind/libtool-version | cut -d: -f1`; \
+ echo UNWIND_SONAME=$$v >> $$cache; \
v=`awk -F= '/^libtool_VERSION/ {split($$2,v,":"); print v[1]}' \
$(srcdir)/libatomic/configure.ac`; \
v=1; \
@@ -84,6 +86,7 @@
LSAN_SONAME = $(call vafilt,$(SONAME_VARS),LSAN_SONAME)
TSAN_SONAME = $(call vafilt,$(SONAME_VARS),TSAN_SONAME)
UBSAN_SONAME = $(call vafilt,$(SONAME_VARS),UBSAN_SONAME)
+UNWIND_SONAME = $(call vafilt,$(SONAME_VARS),UNWIND_SONAME)
VTV_SONAME = $(call vafilt,$(SONAME_VARS),VTV_SONAME)
CILKRTS_SONAME = $(call vafilt,$(SONAME_VARS),CILKRTS_SONAME)
QUADMATH_SONAME = $(call vafilt,$(SONAME_VARS),QUADMATH_SONAME)
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