rust/src/test/run-make/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

ifdef IS_MSVC
all:
	true
else
all:
	$(RUSTC) foo.rs
	nm -g "$(call DYLIB,foo)" | $(CGREP) -v __rdl_ __rde_ __rg_ __rust_
endif
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.`

			`-include ../tools.mk`

			`ifdef IS_MSVC`
			`all:`
			`true`
			`else`
			`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_`
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			`endif`