xgcc: avoid libc.so mix between gcc and binutils-ld linker plugin
Without the change when I attempt to built `nixpkgs` with weekly `gcc-13` (it pulls in `flex` as a build input`) I am getting build failure related to glibc mix caused by glibc loading: ...-binutils-patchelfed-ld-2.40/bin/ld: ...-xgcc-13.0.0/libexec/gcc/x86_64-unknown-linux-gnu/13.0.1/liblto_plugin.so: error loading plugin: ...-bootstrap-tools/lib/libpthread.so.0: undefined symbol: __libc_vfork, version GLIBC_PRIVATE The change disables LTO plugin entirely to avoid loading of `glibc` mix.
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@ -341,6 +341,13 @@ in
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#
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name = "xgcc";
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# xgcc uses ld linked against nixpkgs' glibc and gcc built
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# against bootstrapTools glibc. We can't allow loading
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# $out/libexec/gcc/x86_64-unknown-linux-gnu/13.0.1/liblto_plugin.so
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# to mix libc.so:
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# ...-binutils-patchelfed-ld-2.40/bin/ld: ...-xgcc-13.0.0/libexec/gcc/x86_64-unknown-linux-gnu/13.0.1/liblto_plugin.so:
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# error loading plugin: ...-bootstrap-tools/lib/libpthread.so.0: undefined symbol: __libc_vfork, version GLIBC_PRIVATE
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enableLTO = false;
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})).overrideAttrs (a: {
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# This signals to cc-wrapper (as overridden above in this file) to add `--sysroot`
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