C compiler warnings

[mickeyl]

When compiling anything that depends on swift-crypto, I get a lot of C compiler warnings:

 In file included from /home/mickey/Dokumente/late/Automotive-Swift/ELMpersonator/.build/checkouts/swift-crypto/Sources/CCryptoBoringSSL/gen/bcm/aesni-x86_64-linux.S:5:
In file included from /home/mickey/Dokumente/late/Automotive-Swift/ELMpersonator/.build/checkouts/swift-crypto/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_asm_base.h:43:
In file included from /home/mickey/Dokumente/late/Automotive-Swift/ELMpersonator/.build/checkouts/swift-crypto/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_boringssl_prefix_symbols_asm.h:16:
/home/mickey/Dokumente/late/Automotive-Swift/ELMpersonator/.build/checkouts/swift-crypto/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_boringssl_prefix_symbols.h:1421:20: warning: ISO C99 requires whitespace after the macro name [-Wc99-extensions]
#define OBJC_CLASS_$_swift_crypto_CCryptoBoringSSL_SWIFTPM_MODULE_BUNDLER_FINDER BORINGSSL_ADD_PREFIX(BORINGSSL_PREFIX, OBJC_CLASS_$_swift_crypto_CCryptoBoringSSL_SWIFTPM_MODULE_BUNDLER_FINDER)
                   ^

Would be cool, if you could silence these.

[Lukasa]

Thanks @mickeyl. Can you confirm whether this still reproduces on main? I believe #312 should have fixed this.

[mickeyl]

@Lukasa I can't build main:

In file included from /home/mickey/Documents/late/CornucopiaCore/.build/checkouts/swift-crypto/Sources/CCryptoBoringSSL/crypto/asn1/a_bitstr.cc:57:
In file included from /home/mickey/Documents/late/CornucopiaCore/.build/checkouts/swift-crypto/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_asn1.h:61:
/home/mickey/Documents/late/CornucopiaCore/.build/checkouts/swift-crypto/Sources/CCryptoBoringSSL/include/CCryptoBoringSSL_base.h:446:10: fatal error: 'memory' file not found
#include <memory>
         ^~~~~~~~
1 error generated.

[Lukasa]

Hrm, what Swift release and OS are you using?

[mickeyl]

My systems are running ZorinOS 17.2, a distribution based on Ubuntu 22.04 LTS. Interestingly, on one of those systems it compiles fine.

The system where it compiles fine is with Swift 5.10.1 from https://swiftlang.xyz (back when it was online). A Swift 5.10.1 installation using swiftly bails out w/ said error.

I can't move to Swift 6, since it introduces regressions on Linux.

[Lukasa]

That's fine, Swift 5.10 is a supported platform at the moment and will be until the release of Swift 6.2.

The likely difference here is about the C++ standard library available to the two machines. Do you know which ones each system has?

[mickeyl]

To dpkg -l|grep libstd, both systems report:

ii  libstdc++-11-dev:amd64                                 11.4.0-1ubuntu1~22.04                        amd64
ii  libstdc++6:amd64                                       12.3.0-1ubuntu1~22.04                        amd64
ii  libstdc++6:i386                                        12.3.0-1ubuntu1~22.04                        i386

This is probably not relevant, since the clang that ships with the respective swift installation has its own headers, right? If so, is there a simple way to find out which C++ standard library version clang has to its disposal by running it?

[Lukasa]

It might be easiest to run your build with swift build -v and look at the include paths to work out where it's looking.

[mickeyl]

In order to pinpoint this, I tried to compile a minimal example:

#include <memory>

int main() {
        return 0;
}

On the non-working setup, clang -v hello.cpp results in:

clang version 15.0.0 (https://github.com/apple/llvm-project.git e98989b1092ff3a72610a5be6251b010b06282f7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/mickey/.local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/home/mickey/.local/share/swiftly/toolchains/5.10.1/usr/bin/clang-15" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name hello.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -debugger-tuning=gdb -v -fcoverage-compilation-dir=/tmp -resource-dir /home/mickey/.local/share/swiftly/toolchains/5.10.1/usr/lib/clang/15.0.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++ -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/x86_64-linux-gnu -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/backward -internal-isystem /home/mickey/.local/share/swiftly/toolchains/5.10.1/usr/lib/clang/15.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -fdebug-compilation-dir=/tmp -ferror-limit 19 -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/hello-b758f4.o -x c++ hello.cpp
clang -cc1 version 15.0.0 based upon LLVM 15.0.0git default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/backward"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++
 /home/mickey/.local/share/swiftly/toolchains/5.10.1/usr/lib/clang/15.0.0/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
hello.cpp:1:10: fatal error: 'memory' file not found
#include <memory>
         ^~~~~~~~
1 error generated.

On the working setup, it results in:

clang version 15.0.0 (https://github.com/apple/llvm-project.git e98989b1092ff3a72610a5be6251b010b06282f7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/libexec/swift/5.10.1/usr/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/usr/libexec/swift/5.10.1/usr/bin/clang-15" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name hello.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -debugger-tuning=gdb -v -fcoverage-compilation-dir=/tmp -resource-dir /usr/libexec/swift/5.10.1/usr/lib/clang/15.0.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/x86_64-linux-gnu/c++/12 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/backward -internal-isystem /usr/libexec/swift/5.10.1/usr/lib/clang/15.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -fdebug-compilation-dir=/tmp -ferror-limit 19 -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/hello-bd128f.o -x c++ hello.cpp
clang -cc1 version 15.0.0 based upon LLVM 15.0.0git default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12
 /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/x86_64-linux-gnu/c++/12
 /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/backward
 /usr/libexec/swift/5.10.1/usr/lib/clang/15.0.0/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
 "/usr/bin/ld" -pie -z relro --hash-style=gnu --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /lib/x86_64-linux-gnu/Scrt1.o /lib/x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/12/crtbeginS.o -L/usr/lib/gcc/x86_64-linux-gnu/12 -L/usr/lib/gcc/x86_64-linux-gnu/12/../../../../lib64 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -L/lib -L/usr/lib /tmp/hello-bd128f.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-linux-gnu/12/crtendS.o /lib/x86_64-linux-gnu/crtn.o

I guess

ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/backward"

is the culprit here.

[mickeyl]

Nothing a simple sudo apt install libstdc++-12-dev can't fix. I'll bring it up with swiftly to check further. Sorry for the noise and thanks for the quick responses.

[oliviermartin]

FYI, I had the same issue (Ubuntu 22.04).

When I had the issue, I had:

$ sudo dpkg -l | grep libstdc
ii  libstdc++-11-dev:amd64                                  11.4.0-1ubuntu1~22.04                           amd64        GNU Standard C++ Library v3 (development files)
ii  libstdc++-11-dev-armhf-cross                            11.4.0-1ubuntu1~22.04cross1                     all          GNU Standard C++ Library v3 (development files) (armhf)
ii  libstdc++6:amd64                                        12.3.0-1ubuntu1~22.04                           amd64        GNU Standard C++ Library v3
ii  libstdc++6:i386                                         12.3.0-1ubuntu1~22.04                           i386         GNU Standard C++ Library v3
ii  libstdc++6-armhf-cross                                  12.3.0-1ubuntu1~22.04cross1                     all          GNU Standard C++ Library v3 (armhf)

I did:

$ clang++ -v
clang version 15.0.0 (https://github.com/apple/llvm-project.git 5dc9d563e5a6cd2cdd44117697dead98955ccddf)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/swift/usr/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Candidate multilib: .;@m64
Selected multilib: .;@m64

And installing the version 12 of 'libstdc++' solved my issue sudo apt install libstdc++-12-dev