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stdbuf: add feat_external_stdbuf
Fixes https://github.com/uutils/coreutils/issues/6591 "feat_external_stdbuf": use an external libstdbuf.so for stdbuf instead of embedding it into the stdbuf binary. There are 2 use-cases: 1. Installation of uutils-coreutils using cargo install (e.g. from crates.io which supports only "cargo install" as installation method). In this case, installing libstdbuf.so is impossible, because "cargo install" installs only binary programs (no cdylib), thus libstdbuf.so must be embedded into stdbuf and written to /tmp at runtime. This is a hack, and may not work on some platforms, e.g. because the SELinux permissions may not allow stdbuf to write to /tmp, /tmp may be read-only, libstdbuf.so may not work at all without SELinux labels, etc. 2. Installation of uutils-coreutils using an external tool, e.g. dpkg/apt on debian. In this case, libstdbuf.so should be installed separately to its correct location and the environment variable LIBSTDBUF_PATH configures the installation path during the build. E.g. LIBSTDBUF_PATH="/lib/libstdbuf.so" Signed-off-by: Etienne Cordonnier <ecordonnier@snap.com>
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@ -37,6 +37,9 @@ test_risky_names = []
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# * only build `uudoc` when `--feature uudoc` is activated
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uudoc = ["zip", "dep:uuhelp_parser"]
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## features
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## Optional feature for stdbuf
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# "feat_external_libstdbuf" == use an external libstdbuf.so for stdbuf instead of embedding it
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feat_external_libstdbuf = ["stdbuf/feat_external_libstdbuf"]
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# "feat_acl" == enable support for ACLs (access control lists; by using`--features feat_acl`)
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# NOTE:
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# * On linux, the posix-acl/acl-sys crate requires `libacl` headers and shared library to be accessible in the C toolchain at compile time.
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