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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
commit | 2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35 (patch) | |
tree | d325add32978dbdc1db975a438b3a77d571b1ab8 /src/doc/unstable-book/src/compiler-flags/export-executable-symbols.md | |
parent | Releasing progress-linux version 1.68.2+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.tar.xz rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.zip |
Merging upstream version 1.69.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/doc/unstable-book/src/compiler-flags/export-executable-symbols.md')
-rw-r--r-- | src/doc/unstable-book/src/compiler-flags/export-executable-symbols.md | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/doc/unstable-book/src/compiler-flags/export-executable-symbols.md b/src/doc/unstable-book/src/compiler-flags/export-executable-symbols.md new file mode 100644 index 000000000..c7f10afac --- /dev/null +++ b/src/doc/unstable-book/src/compiler-flags/export-executable-symbols.md @@ -0,0 +1,43 @@ +# `export-executable-symbols` + +The tracking issue for this feature is: [#84161](https://github.com/rust-lang/rust/issues/84161). + +------------------------ + +The `-Zexport-executable-symbols` compiler flag makes `rustc` export symbols from executables. The resulting binary is runnable, but can also be used as a dynamic library. This is useful for interoperating with programs written in other languages, in particular languages with a runtime like Java or Lua. + +For example on windows: +```rust +#[no_mangle] +fn my_function() -> usize { + return 42; +} + +fn main() { + println!("Hello, world!"); +} +``` + +A standard `cargo build` will produce a `.exe` without an export directory. When the `export-executable-symbols` flag is added + +```Bash +export RUSTFLAGS="-Zexport-executable-symbols" +cargo build +``` + +the binary has an export directory with the functions: + +```plain +The Export Tables (interpreted .edata section contents) + +... + +[Ordinal/Name Pointer] Table + [ 0] my_function + [ 1] main +``` +(the output of `objdump -x` on the binary) + +Please note that the `#[no_mangle]` attribute is required. Without it, the symbol is not exported. + +The equivalent of this flag in C and C++ compilers is the `__declspec(dllexport)` annotation or the `-rdynamic` linker flag. |