On 03.10.2019 18:13, Ilya Maximets wrote:
On 02.10.2019 20:15, William Tu wrote:
32-bit and 64-bit libunwind can not be installed at the same time.
For 32-bit build, this patch removes the 64-bit libunwind and install
32-bit version.

Tested-at: https://travis-ci.org/williamtu/ovs-travis/builds/592649311
Fixes: e2ed6fbeb18c ("fatal-signal: Catch SIGSEGV and print backtrace.")
Signed-off-by: William Tu <[email protected]>
---
  .travis/linux-prepare.sh | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/.travis/linux-prepare.sh b/.travis/linux-prepare.sh
index 70fd98f715ed..164adf7ec4f8 100755
--- a/.travis/linux-prepare.sh
+++ b/.travis/linux-prepare.sh
@@ -14,3 +14,9 @@ cd ..
  pip install --disable-pip-version-check --user six flake8 hacking
  pip install --user --upgrade docutils
+
+if [[ $BUILD_ENV =~ "-m32" ]]; then
+    # 32-bit and 64-bit libunwind can not be installed at the same time.
+    # This will remove the 64-bit libunwind and install 32-bit version.
+    sudo apt-get install -y libunwind-dev:i386
+fi


Thanks for the new version.

One thing I noticed is that without additional changes[1] this
patch just makes 'configure' script to fail the library check,
because 32bit library can't be linked with 64bit binary it checks:

     checking for unw_backtrace in -lunwind... no

But it should work as intended with the patch I posted:

[1] https://patchwork.ozlabs.org/patch/1171259/

Note that I replaced $BUILD_ENV with $M32 variable, so one of the
patches will need to be updated depending on the order of applying.
i.e. following diff should be squashed to one of them:

-if [[ $BUILD_ENV =~ "-m32" ]]; then
+if [ "$M32" ]; then

Other than that,
Acked-by: Ilya Maximets <[email protected]>


Hmm, I tried to apply this patch and check the build and it
failed:

lib/backtrace.c: In function ‘log_received_backtrace’:
lib/backtrace.c:105:23: error: format ‘%lx’ expects argument of type ‘long 
unsigned int’, but argument 4 has type ‘unw_word_t {aka unsigned int}’ 
[-Werror=format=]
             VLOG_WARN("0x%016lx <%s+0x%lx>\n",
                       ^
./include/openvswitch/vlog.h:277:41: note: in definition of macro ‘VLOG’
             vlog(&this_module, level__, __VA_ARGS__);   \

lib/backtrace.c:105:13: note: in expansion of macro ‘VLOG_WARN’
             VLOG_WARN("0x%016lx <%s+0x%lx>\n",
             ^
lib/backtrace.c:105:23: error: format ‘%lx’ expects argument of type ‘long 
unsigned int’, but argument 6 has type ‘unw_word_t {aka unsigned int}’ 
[-Werror=format=]
             VLOG_WARN("0x%016lx <%s+0x%lx>\n",
                       ^
./include/openvswitch/vlog.h:277:41: note: in definition of macro ‘VLOG’
             vlog(&this_module, level__, __VA_ARGS__);   \

lib/backtrace.c:105:13: note: in expansion of macro ‘VLOG_WARN’

             VLOG_WARN("0x%016lx <%s+0x%lx>\n",
             ^

Full log:
https://travis-ci.org/igsilya/ovs/jobs/593132451

Best regards, Ilya Maximets.
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