rust/tests/run-make-fulldeps/cdylib-fewer-symbols/Makefile

# Test that allocator-related symbols don't show up as exported from a cdylib as
# they're internal to Rust and not part of the public ABI.

include ../tools.mk

# ignore-windows
# FIXME: The __rdl_ and __rust_ symbol still remains, no matter using MSVC or GNU
# See https://github.com/rust-lang/rust/pull/46207#issuecomment-347561753

all:
	$(RUSTC) foo.rs
	nm -g "$(call DYLIB,foo)" | $(CGREP) -v __rdl_ __rde_ __rg_ __rust_
rustc: Handle some libstd symbole exports better Right now symbol exports, particularly in a cdylib, are handled by assuming that `pub extern` combined with `#[no_mangle]` means "export this". This isn't actually what we want for some symbols that the standard library uses to implement itself, for example symbols related to allocation. Additionally other special symbols like `rust_eh_personallity` have no need to be exported from cdylib crate types (only needed in dylib crate types). This commit updates how rustc handles these special symbols by adding to the hardcoded logic of symbols like `rust_eh_personallity` but also adding a new attribute, `#[rustc_std_internal_symbol]`, which forces the export level to be considered the same as all other Rust functions instead of looking like a C function. The eventual goal here is to prevent functions like `__rdl_alloc` from showing up as part of a Rust cdylib as it's just an internal implementation detail. This then further allows such symbols to get gc'd by the linker when creating a cdylib. 2017-11-01 15:16:36 -05:00			`# Test that allocator-related symbols don't show up as exported from a cdylib as`
			`# they're internal to Rust and not part of the public ABI.`

Diagnose missing includes in run-make tests 2022-08-22 19:00:00 -05:00			`include ../tools.mk`
rustc: Handle some libstd symbole exports better Right now symbol exports, particularly in a cdylib, are handled by assuming that `pub extern` combined with `#[no_mangle]` means "export this". This isn't actually what we want for some symbols that the standard library uses to implement itself, for example symbols related to allocation. Additionally other special symbols like `rust_eh_personallity` have no need to be exported from cdylib crate types (only needed in dylib crate types). This commit updates how rustc handles these special symbols by adding to the hardcoded logic of symbols like `rust_eh_personallity` but also adding a new attribute, `#[rustc_std_internal_symbol]`, which forces the export level to be considered the same as all other Rust functions instead of looking like a C function. The eventual goal here is to prevent functions like `__rdl_alloc` from showing up as part of a Rust cdylib as it's just an internal implementation detail. This then further allows such symbols to get gc'd by the linker when creating a cdylib. 2017-11-01 15:16:36 -05:00
use ignore directives for run-make tests This makes the tests easier to read, and makes it possible to tell which tests aren't being run on the host platform. Fixes #56704. 2019-01-06 15:27:57 -06:00			`# ignore-windows`
Disable the cdylib-fewer-symbols test for all Windows (test was broken). 2017-11-28 09:38:04 -06:00			`# FIXME: The __rdl_ and __rust_ symbol still remains, no matter using MSVC or GNU`
			`# See https://github.com/rust-lang/rust/pull/46207#issuecomment-347561753`
use ignore directives for run-make tests This makes the tests easier to read, and makes it possible to tell which tests aren't being run on the host platform. Fixes #56704. 2019-01-06 15:27:57 -06:00
rustc: Handle some libstd symbole exports better Right now symbol exports, particularly in a cdylib, are handled by assuming that `pub extern` combined with `#[no_mangle]` means "export this". This isn't actually what we want for some symbols that the standard library uses to implement itself, for example symbols related to allocation. Additionally other special symbols like `rust_eh_personallity` have no need to be exported from cdylib crate types (only needed in dylib crate types). This commit updates how rustc handles these special symbols by adding to the hardcoded logic of symbols like `rust_eh_personallity` but also adding a new attribute, `#[rustc_std_internal_symbol]`, which forces the export level to be considered the same as all other Rust functions instead of looking like a C function. The eventual goal here is to prevent functions like `__rdl_alloc` from showing up as part of a Rust cdylib as it's just an internal implementation detail. This then further allows such symbols to get gc'd by the linker when creating a cdylib. 2017-11-01 15:16:36 -05:00			`all:`
			`$(RUSTC) foo.rs`
Replace most call to grep in run-make by a script that cat the input. Introduced a new src/etc/cat-and-grep.sh script (called in run-make as $(CGREP)), which prints the input and do a grep simultaneously. This is mainly used to debug spurious failures in run-make, such as the sanitizer error in #45810, as well as real errors such as #46126. 2017-11-23 09:19:50 -06:00			`nm -g "$(call DYLIB,foo)" \| $(CGREP) -v __rdl_ __rde_ __rg_ __rust_`