Re: building with llvm16 pkg fails in tests

Ronald Klop <ronald_at_FreeBSD.org> wrote on
Date: Thu, 17 Aug 2023 10:45:06 UTC :

> To save time on my Raspberry Pi I would like to build FreeBSD using a llvm pkg instead of llvm in the tree.
> 
> My /etc/make.conf:
> WITHOUT_TOOLCHAIN=yes
> LD=/usr/local/llvm16/bin/ld.lld
> CC=/usr/local/llvm16/bin/clang
> CXX=/usr/local/llvm16/bin/clang++
> CPP=/usr/local/llvm16/bin/clang-cpp
> OBJCOPY=/usr/local/llvm16/bin/llvm-objcopy
> 
> #WITHOUT_CLEAN=yes

More normal would likely be something like (but
expressed just in command line notation below):

make -j$(sysctl -n hw.ncpu) CROSS_TOOLCHAIN=llvm16 WITHOUT_TOOLCHAIN=yes buildworld buildkernel

The CROSS_TOOLCHAIN hook is already present and
avoids needing the explicit assignments to LD, CC,
CXX, CPP, and OBJCOPY . (Those presume the host is
compatible with the target, by the way. See below
for notation that does not presume such --but
allows such.)

For reference, CROSS_TOOLCHAIN=llvm16 uses:

# more /usr/local/share/toolchains/llvm16.mk
XCC=/usr/local/bin/clang16
XCXX=/usr/local/bin/clang++16
XCPP=/usr/local/bin/clang-cpp16
XLD=/usr/local/bin/ld.lld16
CROSS_BINUTILS_PREFIX=/var/empty
X_COMPILER_TYPE=clang

that is installed as part of devel/llvm16 .


> This fails in:
> 
> /usr/local/llvm16/bin/clang++ -O2 -pipe -fno-common -fPIE -Wno-format-zero-length -nobuiltininc -idirafter /usr/local/llvm16/lib/clang/16/include -fstack-protector-strong -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter -Wcast-align -Wchar-subscripts -Wdate-time -Wmissing-variable-declarations -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -Wno-error=unused-but-set-parameter -O0 -g0 -Qunused-arguments -I/usr/obj/usr/src/amd64.amd64/tmp/usr/include/private -I/usr/src/contrib/googletest/googlemock/include -I/usr/src/contrib/googletest/googlemock -I/usr/src/contrib/googletest/googletest/include -I/usr/src/contrib/googletest/googletest -I/usr/obj/usr/src/amd64.amd64/tmp/usr/include/private -DGTEST_HAS_POSIX_RE=1 -DGTEST_HAS_PTHREAD=1 -DGTEST_HAS_STREAM_REDIRECTION=1 -frtti -Wno-deprecated-copy -Wno-signed-unsigned-wchar -DGTEST_HAS_POSIX_RE=1 -DGTEST_HAS_PTHREAD=1 -DGTEST_HAS_STREAM_REDIRECTION=1 -frtti -Wno-deprecated-copy -Wno-signed-unsigned-wchar -fPIE -std=c++14 -Wno-deprecated-copy -Wno-error=inconsistent-missing-override -Wno-error=missing-variable-declarations -Wno-error=sign-compare -Wno-error=unused-parameter -Wno-c++11-extensions -Wl,-zrelro -pie --ld-path=/usr/local/llvm16/bin/ld.lld -o gmock-actions_test gmock-actions_test.o -lprivategmock_main -lprivategmock -lprivategtest
> ld.lld: error: undefined symbol: testing::internal::DeathTest::Create(char const*, testing::Matcher<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&>, char const*, int, testing::internal::DeathTest**)
> >>> referenced by gmock-actions_test.cc
> >>> gmock-actions_test.o:(testing::(anonymous namespace)::BuiltInDefaultValueDeathTest_IsUndefinedForReferences_Test::TestBody())
> >>> referenced by gmock-actions_test.cc
> >>> gmock-actions_test.o:(testing::(anonymous namespace)::BuiltInDefaultValueDeathTest_IsUndefinedForReferences_Test::TestBody())
> >>> referenced by gmock-actions_test.cc
> >>> gmock-actions_test.o:(testing::(anonymous namespace)::BuiltInDefaultValueDeathTest_IsUndefinedForNonDefaultConstructibleType_Test::TestBody())
> >>> referenced 4 more times
> 
> ld.lld: error: undefined symbol: testing::Expectation::Expectation(std::__1::shared_ptr<testing::internal::ExpectationBase> const&)

I'm not making claims about the specifics of this error
being produced vs. not the "more normal" way. But it would
be worth a try.

> Any thoughts on how to fix this?
> Compiling with the in tree llvm does work properly.
> 
> NB: building 14-CURRENT in a 14-CURRENT jail on 13.2-RELEASE. And this example is my test on amd64 to make it work before I will do this in the slow RPI4.



===
Mark Millard
marklmi at yahoo.com