🐛 delta fails to build with enabled lto

[Porkepix]

I used to update git-delta to latest commit for quite some time, through ArchLinux's AUR, from https://aur.archlinux.org/packages/git-delta-git
Recently, Arch changed building defaults to enable lto by default for everything.

It caused some of these packages to fail to build under lto option, and delta is one of them.

I didn't see any report of the failing build with lto so it felt like it's always worth a report, even if it's to explain that it's intended.

The build/link errors are the following ones:

[…]
   Compiling syntect v5.0.0
   Compiling git2 v0.17.2
   Compiling git-delta v0.16.5 (/home/clement/.cache/yay/git-delta-git/src/delta)
error: linking with `cc` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/usr/lib64/rustlib/x86_64-unknown-linux-gnu/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/var/lib/flatpak/exports/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl" VSLANG="1033" "cc" "-m64" "/tmp/rustckAXkMr/symbols.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.00.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.01.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.02.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.03.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.04.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.05.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.06.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.07.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.08.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.09.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.10.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.11.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.12.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.13.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.14.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.15.rcgu.o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.1pwm0cnj1ubtt639.rcgu.o" "-Wl,--as-needed" "-L" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps" "-L" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/build/onig_sys-9f4eaa7c8b8303ee/out" "-L" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/build/libgit2-sys-69c41211096908ce/out/build" "-L" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libctrlc-bbb6852a2a48df02.rlib" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libnix-2c603f546327d8b3.rlib" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libpalette-3fab71efec26a952.rlib" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libfast_srgb8-fa282ec935783f93.rlib" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libphf-c41b9af61c5b09f8.rlib" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libphf_shared-dc879fcfe3ce1d2d.rlib" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libsiphasher-4aea6efb24f6a23a.rlib" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libapprox-f681af22ad0c7065.rlib" 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"/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libarrayvec-070e05729dfc8ade.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libstd-dce4da11b2ccc789.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-c5aff1055622daf3.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libobject-9027304ca17f2680.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-c5fb359364fdb009.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-19a4ac3a15b73927.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-545ef01c478e3996.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-6ac5c2838ec4f836.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-290b884672cd911f.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-f9093be1927a1602.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-19087ab4fa333a2c.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-f66fa5fbf4547710.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libadler-d7285f96d8856fea.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-406c5a4d6fa7f15b.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-43d91895302c1941.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-8e42f4a5e7a1d2d4.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-79b317ec80906222.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-099918608866d404.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libcore-9a01eccf23a84d5b.rlib" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-dc359f8c64813cd3.rlib" "-Wl,-Bdynamic" "-lz" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/usr/lib64/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-Wl,-O1" "-nodefaultlibs"
  = note: /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/liblibgit2_sys-48f6f901be762756.rlib(libgit2_sys-48f6f901be762756.libgit2_sys.dd2e6843b1b72bd7-cgu.0.rcgu.o): in function `libgit2_sys::init::{{closure}}':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libgit2-sys-0.15.2+1.6.4/lib.rs:4243:(.text.unlikely._ZN3std10sys_common4once5futex4Once4call17h8addfb411a121b0aE+0xb0): undefined reference to `git_libgit2_init'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libgit2-sys-0.15.2+1.6.4/lib.rs:4252:(.text.unlikely._ZN3std10sys_common4once5futex4Once4call17h8addfb411a121b0aE+0x15c): undefined reference to `git_error_last'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libsyntect-eab86f2473421451.rlib(syntect-eab86f2473421451.syntect.f641a764216d1ef6-cgu.12.rcgu.o): in function `onig::syntax::Syntax::default':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/syntax.rs:97:(.text._ZN4core3ops8function6FnOnce40call_once$u7b$$u7b$vtable.shim$u7d$$u7d$17h7fa14eb015c2042fE.llvm.7893781050962898617+0x28): undefined reference to `OnigDefaultSyntax'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/syntax.rs:97:(.text._ZN9once_cell3imp17OnceCell$LT$T$GT$10initialize28_$u7b$$u7b$closure$u7d$$u7d$17h8b2bb4e58f56d232E.llvm.7893781050962898617+0x27): undefined reference to `OnigDefaultSyntax'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.1.rcgu.o): in function `<onig::match_param::MatchParam as core::default::Default>::default':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/match_param.rs:37:(.text._ZN72_$LT$onig..match_param..MatchParam$u20$as$u20$core..default..Default$GT$7default17h30dd42d2acfa5d0eE+0x3): undefined reference to `onig_new_match_param'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/match_param.rs:38:(.text._ZN72_$LT$onig..match_param..MatchParam$u20$as$u20$core..default..Default$GT$7default17h30dd42d2acfa5d0eE+0xf): undefined reference to `onig_initialize_match_param'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.1.rcgu.o): in function `<onig::match_param::MatchParam as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/match_param.rs:48:(.text._ZN71_$LT$onig..match_param..MatchParam$u20$as$u20$core..ops..drop..Drop$GT$4drop17hbaeadb2ca8e276e0E+0x5): undefined reference to `onig_free_match_param'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.2.rcgu.o): in function `<onig::region::Region as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/region.rs:208:(.text._ZN4core3ptr41drop_in_place$LT$onig..region..Region$GT$17h3d95ac49061210f2E+0x4): undefined reference to `onig_region_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.2.rcgu.o): in function `onig::region::Region::reserve':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/region.rs:81:(.text._ZN4onig6region6Region13with_capacity17ha6b46158920f961cE+0x19): undefined reference to `onig_region_resize'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.2.rcgu.o): in function `<onig::region::Region as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/region.rs:208:(.text._ZN62_$LT$onig..region..Region$u20$as$u20$core..ops..drop..Drop$GT$4drop17h0288d0a83ab14cb4E+0x4): undefined reference to `onig_region_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.2.rcgu.o): in function `onig::region::Region::clone_from_raw':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/region.rs:52:(.text._ZN59_$LT$onig..region..Region$u20$as$u20$core..clone..Clone$GT$5clone17h1438b1195e932864E+0x19): undefined reference to `onig_region_copy'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.08.rcgu.o: in function `git2::repo::Repository::discover':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/repo.rs:254:(.text._ZN4git24repo10Repository8discover17h20c779139a3cddebE+0x6b): undefined reference to `git_repository_discover'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/delta-340c855f98c02c6b.delta.f0b890de4f8c8231-cgu.08.rcgu.o: in function `git2::repo::Repository::open':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/repo.rs:137:(.text._ZN4git24repo10Repository8discover17h20c779139a3cddebE+0xda): undefined reference to `git_repository_open'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.00.rcgu.o): in function `git2::repo::Repository::find_remote':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/repo.rs:592:(.text._ZN4git24repo10Repository11find_remote17haa669d284156d8f2E+0x59): undefined reference to `git_remote_lookup'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.00.rcgu.o): in function `git2::repo::Repository::config':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/repo.rs:1062:(.text._ZN4git24repo10Repository6config17h93daff0580d2f683E+0x1b): undefined reference to `git_repository_config'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.00.rcgu.o): in function `<git2::repo::Repository as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/repo.rs:3233:(.text._ZN64_$LT$git2..repo..Repository$u20$as$u20$core..ops..drop..Drop$GT$4drop17h76d6220ef68f9b44E+0x5): undefined reference to `git_repository_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `<git2::buf::Buf as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/buf.rs:69:(.text._ZN4core3ptr35drop_in_place$LT$git2..buf..Buf$GT$17hf670157c6536d3cbE+0x2): undefined reference to `git_buf_dispose'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::Config::open':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:83:(.text._ZN4git26config6Config4open17h2133e4ab40614708E+0x7e): undefined reference to `git_config_open_ondisk'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::Config::open_default':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:97:(.text._ZN4git26config6Config12open_default17h8da040e53af389a7E+0x2d): undefined reference to `git_config_open_default'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::Config::get_bool':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:203:(.text._ZN4git26config6Config8get_bool17h1ac5d5758ca681b5E+0x58): undefined reference to `git_config_get_bool'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::Config::get_i64':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:231:(.text._ZN4git26config6Config7get_i6417h25735a2fd4cbe5c5E+0x59): undefined reference to `git_config_get_int64'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::Config::get_string':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:270:(.text._ZN4git26config6Config10get_string17hef3fe166632a5672E+0x81): undefined reference to `git_config_get_string_buf'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:275:(.text._ZN4git26config6Config10get_string17hef3fe166632a5672E+0x31b): undefined reference to `git_buf_dispose'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::Config::entries':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:336:(.text._ZN4git26config6Config7entries17h94037dc5f3ce814eE+0x5e): undefined reference to `git_config_iterator_glob_new'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:339:(.text._ZN4git26config6Config7entries17h94037dc5f3ce814eE+0x91): undefined reference to `git_config_iterator_new'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::Config::snapshot':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:458:(.text._ZN4git26config6Config8snapshot17hfb67222d8e39c709E+0x1b): undefined reference to `git_config_snapshot'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `<git2::config::Config as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:514:(.text._ZN62_$LT$git2..config..Config$u20$as$u20$core..ops..drop..Drop$GT$4drop17h637459f95eb740c0E+0x5): undefined reference to `git_config_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `<git2::config::ConfigEntry as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:637:(.text._ZN4git26config13ConfigEntries4next17h304ee4a055cba1abE+0x27): undefined reference to `git_config_entry_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `git2::config::ConfigEntries::next':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:607:(.text._ZN4git26config13ConfigEntries4next17h304ee4a055cba1abE+0x33): undefined reference to `git_config_next'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `<git2::config::ConfigEntries as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:630:(.text._ZN69_$LT$git2..config..ConfigEntries$u20$as$u20$core..ops..drop..Drop$GT$4drop17h97b93ed6ac87837aE+0x5): undefined reference to `git_config_iterator_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.08.rcgu.o): in function `<git2::config::ConfigEntry as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/config.rs:637:(.text._ZN67_$LT$git2..config..ConfigEntry$u20$as$u20$core..ops..drop..Drop$GT$4drop17ha31baffac3d896f7E+0xb): undefined reference to `git_config_entry_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.10.rcgu.o): in function `git2::error::Error::last_error':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/error.rs:58:(.text._ZN4git25error5Error10last_error17hffc08210b8b27171E+0x2a): undefined reference to `git_error_last'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/error.rs:58:(.text._ZN4git25error5Error10last_error17hffc08210b8b27171E+0x130): undefined reference to `git_error_last'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/error.rs:66:(.text._ZN4git25error5Error10last_error17hffc08210b8b27171E+0x196): undefined reference to `git_error_clear'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.13.rcgu.o): in function `<git2::buf::Buf as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/buf.rs:69:(.text._ZN56_$LT$git2..buf..Buf$u20$as$u20$core..ops..drop..Drop$GT$4drop17hc21452020d375b33E+0x2): undefined reference to `git_buf_dispose'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.15.rcgu.o): in function `git2::remote::Remote::url_bytes':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/remote.rs:146:(.text._ZN4git26remote6Remote3url17h0302733b5c0e42f5E+0xa): undefined reference to `git_remote_url'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libgit2-5c456929a04fdb71.rlib(git2-5c456929a04fdb71.git2.e001ce5ee71611f4-cgu.15.rcgu.o): in function `<git2::remote::Remote as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/git2-0.17.2/src/remote.rs:445:(.text._ZN62_$LT$git2..remote..Remote$u20$as$u20$core..ops..drop..Drop$GT$4drop17h4122e77c3d6ff90aE+0x5): undefined reference to `git_remote_free'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libsyntect-eab86f2473421451.rlib(syntect-eab86f2473421451.syntect.f641a764216d1ef6-cgu.06.rcgu.o): in function `onig::Regex::search_with_param':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:707:(.text._ZN4onig5Regex17search_with_param17h51018bce7cf2fbd3E+0x3c): undefined reference to `OnigEncodingUTF8'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:710:(.text._ZN4onig5Regex17search_with_param17h51018bce7cf2fbd3E+0x49): undefined reference to `OnigEncodingUTF8'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:723:(.text._ZN4onig5Regex17search_with_param17h51018bce7cf2fbd3E+0x1cb): undefined reference to `onig_search_with_param'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.3.rcgu.o): in function `onig::Error::new':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:166:(.text._ZN4onig5Error3new17h3f567a3a67144f30E+0x40): undefined reference to `onig_error_code_to_str'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.3.rcgu.o): in function `onig::Regex::with_options_and_encoding':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:347:(.text._ZN4onig5Regex25with_options_and_encoding17hb47373bcb270f3a5E+0x97): undefined reference to `OnigEncodingUTF8'
          /usr/bin/ld: /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:347:(.text._ZN4onig5Regex25with_options_and_encoding17hb47373bcb270f3a5E+0xad): undefined reference to `onig_new'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.3.rcgu.o): in function `onig::Error::new':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:166:(.text._ZN4onig5Regex25with_options_and_encoding17hb47373bcb270f3a5E+0x125): undefined reference to `onig_error_code_to_str'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.3.rcgu.o): in function `onig::Regex::encoding':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:824:(.text._ZN4onig5Regex8encoding17hb8a8845a051b0bd4E+0x5): undefined reference to `onig_get_encoding'
          /usr/bin/ld: /home/clement/.cache/yay/git-delta-git/src/delta/target/release/deps/libonig-45f5d891c751d818.rlib(onig-45f5d891c751d818.onig.36b05d929265f9b6-cgu.3.rcgu.o): in function `<onig::Regex as core::ops::drop::Drop>::drop':
          /home/clement/.cargo/registry/src/index.crates.io-6f17d22bba15001f/onig-6.4.0/src/lib.rs:841:(.text._ZN53_$LT$onig..Regex$u20$as$u20$core..ops..drop..Drop$GT$4drop17h6b0c38e08c6508caE+0x5): undefined reference to `onig_free'
          collect2: error: ld returned 1 exit status

  = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
  = note: use the `-l` flag to specify native libraries to link
  = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-link-libkindname)

error: could not compile `git-delta` (bin "delta") due to 1 previous error
==> ERROR: A failure occurred in build().
    Aborting...
 -> error making: git-delta-git-exit status 4
 -> Failed to install the following packages. Manual intervention is required:
git-delta-git - exit status 4

I'm not much knowledgeable of the matter, but I'm guessing issue would come from onig crate, coming from there:

onig v6.4.0
└── syntect v5.1.0
    ├── bat v0.23.0
    │   └── git-delta v0.16.5 (/home/clement/.cache/yay/git-delta-git/src/delta)
    └── git-delta v0.16.5 (/home/clement/.cache/yay/git-delta-git/src/delta)

[Bennett-Petzold]

I've also had this issue. I believe the issue is the that the library built (onig, using onig-sys, using rust-bindgen) doesn't emit lto-valid code. It needs to be built with LLVM LTO format (since that's the rustc LTO output) by setting the C compiler to clang and manually specifying some linker configuration. It builds properly on my system when I do that.

So use RUSTFLAGS="-C linker-plugin-lto -C linker=clang -C link-arg=-fuse-ld=lld" CC=clang cargo .... For the Arch Linux PKGBUILD, put this ahead of the build and test cargo invocations.

Here's a source for the rustflags combo: rust-lang/rust-bindgen#2405