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static-pie for musl target (remove crt1.o) #53968
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A-linkage
Area: linking into static, shared libraries and binaries
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O-musl
Target: The musl libc
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In case anyone wants to work on this: Something like this (introducing a flag to make rustc trust the linker to include the right start files) was discussed and a (at the time working) patch for it proposed at #50105, but was scrapped (the version that eventually landed didn't include that flag anymore) because there was an easier way to fix my issue and there were concerns over adding another target feature for this. |
jonas-schievink
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A-linkage
Area: linking into static, shared libraries and binaries
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Relevant to the compiler team, which will review and decide on the PR/issue.
O-musl
Target: The musl libc
E-help-wanted
Call for participation: Help is requested to fix this issue.
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Jan 27, 2019
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RalfJung
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Jun 18, 2020
Enabling static-pie for musl and make it the default for the x86_64-unknown-linux-musl target This is a quick implementation for rust-lang#70693 Opening it as a draft PR to gather some feedback, before I put more work in it. ```console ❯ cat hello.rs fn main() { println!("main = {:#x}", &main as *const _ as usize); } ❯ /tmp/rust-musl/bin/rustc --target x86_64-unknown-linux-musl ~/hello.rs ❯ ldd hello statically linked ❯ file hello hello: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=fec5cdc170f503a712a63a6958691ce5ce433654, with debug_info, not stripped ❯ ./hello main = 0x7f233ca30008 ❯ ./hello main = 0x7f9ddc529008 ❯ ./hello main = 0x7f1e5a224008 ❯ ./hello main = 0x7f4485c7c008 ❯ /tmp/rust-musl/bin/rustc --target x86_64-unknown-linux-musl -Z print-link-args ~/hello.rs "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-Wl,--eh-frame-hdr" "-m64" "-nostdlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/rcrt1.o" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/crti.o" "-L" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib" "hello.hello.7rcbfp3g-cgu.0.rcgu.o" "hello.hello.7rcbfp3g-cgu.1.rcgu.o" "hello.hello.7rcbfp3g-cgu.2.rcgu.o" "hello.hello.7rcbfp3g-cgu.3.rcgu.o" "hello.hello.7rcbfp3g-cgu.4.rcgu.o" "hello.hello.7rcbfp3g-cgu.5.rcgu.o" "-o" "hello" "hello.1nxjf9so94czdgcz.rcgu.o" "-Wl,--gc-sections" "-static-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib" "-Wl,--start-group" "-Wl,-Bstatic" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libstd-0f9cb7646f9e2c34.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libpanic_unwind-ba857f2f2e4e7187.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libhashbrown-58ba5e25bbdf9d29.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/librustc_std_workspace_alloc-886bfe43afa847dc.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libbacktrace-fbfb8fe99f19a67b.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libbacktrace_sys-85fa859e7d364cc9.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/librustc_demangle-07ab026cd3ec0d82.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libunwind-a8ec5932d92ea864.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libcfg_if-0ba4cc2f38a198d5.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/liblibc-c1bb2b3ce4f78b7c.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/liballoc-0ff673c1cf0d451a.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/librustc_std_workspace_core-c8ff2001db856926.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libcore-2ae14177140eeca2.rlib" "-Wl,--end-group" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libcompiler_builtins-4fd81b5ce1b08a9c.rlib" "-static" "-Wl,-Bdynamic" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/crtn.o" ``` Closes rust-lang#70693 Closes rust-lang#53968
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Labels
A-linkage
Area: linking into static, shared libraries and binaries
E-help-wanted
Call for participation: Help is requested to fix this issue.
O-musl
Target: The musl libc
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
rustc explicitly adds crt1 before passing to the linker, which breaks musl-cross.
for static-pie we need to use rcrt1 instead.
Also i think crt1.o is actually wrong, since that target is supposed to support both dyn and static.
rust/src/librustc_target/spec/linux_musl_base.rs
Line 59 in b7c6e8f
any chance we can at least have a rustc arg that removes the crt? (like -nostartfiles essentially)
or a blank target that lets the user configure the rest of the target via commandline.
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