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meson/test cases/rust/14 external libm/rs_math.rs

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tests/rust: Add rust case linking to libm in rust static library When building on Linux, I see: rustc -C linker=cc --color=always --crate-type rlib --crate-name rs_math -g --emit dep-info=rs_math.d --emit link -L /usr/lib/x86_64-linux-gnu -o librs_math.rlib -l static=m ../rs_math.rs error: failed to add native library /usr/lib/x86_64-linux-gnu/libm.a: file too small to be an archive I think the "file too small to be an archive" message is coming from libLLVM, and is a case of LLVM not handling this type of "script archive". So, possibly this is just LLVM not handling a linking case. The rust_args usage in meson.build is invalid, but required to reproduce the issue in the test case. Perhaps meson should automatically add the library include path via the dep_m meson object, or maybe the meson.build can add the link path in a better way. Changing '-l static=m' to '-l dylib=m' appears to fix this case. (See comments in meson.build.)
2021-02-27 02:24:25 +08:00
#![crate_name = "rs_math"]
use std::os::raw::c_double;
extern "C" {
fn log2(n: c_double) -> c_double;
}
#[no_mangle]
pub extern fn rs_log2(n: c_double) -> c_double {
unsafe { log2(n) }
}