Configure failure during check for whether "objc really works" about libs-base

[gcasa]

Did you install David Chisnall's libobjc2? configure:7857: checking whether objc really works configure:7877: clang -o conftest -g -O2 -I/usr/GNUstep/Local/Library/Headers -I/usr/GNUstep/Local/Library/Headers -I/usr/GNUstep/System/Library/Headers -I/usr/GNUstep/Local/Library/Headers -x objective-c -L/usr/GNUstep/Local/Library/Libraries -L/usr/GNUstep/Local/Library/Libraries -L/usr/GNUstep/System/Library/Libraries -L/usr/GNUstep/Local/Library/Libraries conftest.c -lrt -ldl -lpthread -rdynamic -pthread -fexceptions -fobjc-runtime=gnustep-2.0 -fblocks -L/home/patryk/GNUstep/Library/Libraries -L/usr/GNUstep/Local/Library/Libraries -L/usr/GNUstep/System/Library/Libraries -lobjc -lm >&5 In file included from conftest.c:105: In file included from ././config/config.objc.m:2: ././config/objc-common.g:54:3: warning: assignment to Objective-C's isa is deprecated in favor of object_setClass() [-Wdeprecated-objc-isa-usage] obj->isa = self; ^ ~~~~~~~ object_setClass( , ) ././config/objc-common.g:47:5: note: instance variable is declared here id isa; ^ 1 warning generated. /usr/bin/ld: /usr/GNUstep/Local/Library/Libraries/libobjc.so: undefined reference to `std::__throw_length_error(char const*)' clang-10: error: linker command failed with exit code 1 (use -v to see invocation) configure:7877: $? = 1 configure: program exited with status 1 configure: failed program was:

…

On Sat, Aug 29, 2020 at 4:46 PM Patryk Laurent ***@***.***> wrote: Hello, I'm running into an error while building libs-base under Alpine linux using Clang 10. (Libobjc2 installed fine.) During ./configure for libs-base, I get the following error: *checking whether objc really works... no* But there's no further indication on what the problem is. Can anyone provide insight? Complete logs attached. Thank you, Patryk Attachments log.txt <https://github.com/gnustep/libs-base/files/5145972/log.txt> config.log.txt <https://github.com/gnustep/libs-base/files/5145973/config.log.txt> $ ./configure checking build system type... aarch64-unknown-linux-gnu [...] checking whether objc really works... no I don't seem to be able to use your Objective-C compiler to produce working binaries! Please check your Objective-C compiler installation. If you are using gcc-3.x make sure that your compiler's libgcc_s and libobjc can be found by the dynamic linker - usually that requires you to play with LD_LIBRARY_PATH or /etc/ld.so.conf. Please refer to your compiler installation instructions for more help. configure: error: The Objective-C compiler does not work or is not installed properly. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#156>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAG2JY3JWZLWWCGQZINXTLSDFSJNANCNFSM4QPGGXGQ> .

-- Gregory Casamento GNUstep Lead Developer / OLC, Principal Consultant http://www.gnustep.org - http://heronsperch.blogspot.com https://www.patreon.com/bePatron?u=352392 - Become a Patron https://gf.me/u/x8m3sx - My GNUstep GoFundMe https://teespring.com/stores/gnustep - Store

[plaurent]

That's odd. Yes I did use David's libobjc2. I used the latest from master, it seemed to build and install successfully, although there were some unfamiliar-looking warnings during libobjc2's build step (see below).

The error from libs-base ./configure makes me think it's something about Alpine linux being musl based rather than libc (?) based:

/usr/bin/ld: /usr/GNUstep/Local/Library/Libraries/libobjc.so: undefined
reference to `std::__throw_length_error(char const*)'

I'll see if there's something I can install that provides that function.

For completeness, here are the strange warnings during libobjc2 configure.

libobjc2/build/$ cmake ../ -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_ASM_COMPILER=clang -DTESTS=OFF
[...]
libobjc2/build/$ cmake --build .
[...]
[ 72%] Building ASM object CMakeFiles/objc.dir/eh_trampoline.s.o
clang-10: warning: argument unused during compilation: '-D CXA_ALLOCATE_EXCEPTION_SPECIFIER=noexcept' [-Wunused-command-line-argument]
clang-10: warning: argument unused during compilation: '-D GC_DEBUG' [-Wunused-command-line-argument]
clang-10: warning: argument unused during compilation: '-D GNUSTEP' [-Wunused-command-line-argument]
clang-10: warning: argument unused during compilation: '-D NO_LEGACY' [-Wunused-command-line-argument]
clang-10: warning: argument unused during compilation: '-D OLDABI_COMPAT=1' [-Wunused-command-line-argument]
clang-10: warning: argument unused during compilation: '-D TYPE_DEPENDENT_DISPATCH' [-Wunused-command-line-argument]
clang-10: warning: argument unused during compilation: '-D __OBJC_RUNTIME_INTERNAL__=1' [-Wunused-command-line-argument]
clang-10: warning: argument unused during compilation: '-D objc_EXPORTS' [-Wunused-command-line-argument]
[ 75%] Building C object CMakeFiles/objc.dir/NSBlocks.m.o
[...]
libobjc2/build/$ sudo -E make install

[plaurent]

It turns out under Alpine Linux I need to add the following: -lstdc++ to, e.g., LDFLAGS, to get access to that function.

Thanks, Greg!

[gcasa]

Sweet, glad you found it.

…

On Sun, Aug 30, 2020 at 2:56 PM Patryk Laurent ***@***.***> wrote: It turns out under Alpine Linux I need to add the following: -lstdc++ to, e.g., LDFLAGS, to get access to that function. Thanks, Greg! — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#156 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAG2J72YWCOFRA2DAZSYQLSDKOEPANCNFSM4QPGGXGQ> .

-- Gregory Casamento GNUstep Lead Developer / OLC, Principal Consultant http://www.gnustep.org - http://heronsperch.blogspot.com https://www.patreon.com/bePatron?u=352392 - Become a Patron https://gf.me/u/x8m3sx - My GNUstep GoFundMe https://teespring.com/stores/gnustep - Store