Warning: conditional outside an IT block for Thumb.

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Hi all,

I am seeing a flood of warnings when compiling openvdb+tbb on Debian/armel:

[...]
 [  2%] Building CXX object
openvdb/openvdb/CMakeFiles/openvdb_shared.dir/io/Archive.cc.o
 cd /<<PKGBUILDDIR>>/obj-arm-linux-gnueabi/openvdb/openvdb &&
/usr/bin/c++ -DBOOST_ALL_NO_LIB -DBOOST_IOSTREAMS_DYN_LINK
-DOPENVDB_DLL -DOPENVDB_PRIVATE -DOPENVDB_USE_LOG4CPLUS
-Dopenvdb_shared_EXPORTS -I/<<PK
GBUILDDIR>>/openvdb/openvdb/..
-I/<<PKGBUILDDIR>>/obj-arm-linux-gnueabi/openvdb/openvdb
-I/<<PKGBUILDDIR>>/obj-arm-linux-gnueabi/openvdb/openvdb/openvdb
-I/<<PKGBUILDDIR>>/openvdb/openvdb/. -I/usr/include/Imat
h -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong
-Wformat -Werror=format-security -Wno-psabi -fvisibility=hidden
-fvisibility-inlines-hidden -Wa,-mimplicit-it=thumb -Wdate-time
-D_FORTIFY
_SOURCE=2 -fPIC -std=c++17 -MD -MT
openvdb/openvdb/CMakeFiles/openvdb_shared.dir/Grid.cc.o -MF
CMakeFiles/openvdb_shared.dir/Grid.cc.o.d -o
CMakeFiles/openvdb_shared.dir/Grid.cc.o -c /<<PKGBUILDDIR>>/openvdb/o
penvdb/Grid.cc
 cd /<<PKGBUILDDIR>>/obj-arm-linux-gnueabi/openvdb/openvdb &&
/usr/bin/c++ -DBOOST_ALL_NO_LIB -DBOOST_IOSTREAMS_DYN_LINK
-DOPENVDB_DLL -DOPENVDB_PRIVATE -DOPENVDB_USE_LOG4CPLUS
-Dopenvdb_shared_EXPORTS -I/<<PK
GBUILDDIR>>/openvdb/openvdb/..
-I/<<PKGBUILDDIR>>/obj-arm-linux-gnueabi/openvdb/openvdb
-I/<<PKGBUILDDIR>>/obj-arm-linux-gnueabi/openvdb/openvdb/openvdb
-I/<<PKGBUILDDIR>>/openvdb/openvdb/. -I/usr/include/Imat
h -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong
-Wformat -Werror=format-security -Wno-psabi -fvisibility=hidden
-fvisibility-inlines-hidden -Wa,-mimplicit-it=thumb -Wdate-time
-D_FORTIFY
_SOURCE=2 -fPIC -std=c++17 -MD -MT
openvdb/openvdb/CMakeFiles/openvdb_shared.dir/io/Archive.cc.o -MF
CMakeFiles/openvdb_shared.dir/io/Archive.cc.o.d -o
CMakeFiles/openvdb_shared.dir/io/Archive.cc.o -c /<<PKGBU
ILDDIR>>/openvdb/openvdb/io/Archive.cc
/tmp/ccFlliCl.s: Assembler messages:
/tmp/ccFlliCl.s:294: Warning: conditional outside an IT block for Thumb.
/tmp/ccFlliCl.s:338: Warning: conditional outside an IT block for Thumb.
[...]

There are so many warnings that it eventually times out the compilation.

I could not find a way to tell gcc not to print a warning. Is there a
way to remove this warning ?

For reference the very large log:

* https://buildd.debian.org/status/fetch.php?pkg=openvdb&arch=armel&ver=9.1.0-4&stamp=1661358853&raw=0

Thanks much,
-- 
Mathieu



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