2475707322
We want to prevent compiling something against one version of a dynamic library and then, at runtime accidentally using a different version of the dynamic library. With the old symbol-naming scheme this could not happen because every symbol had the SVH in it and you'd get an error by the dynamic linker when using the wrong version of a dylib. With the new naming scheme this isn't the case any more, so this patch adds the "link-guard" to prevent this error case. This is implemented as follows: - In every crate that we compile, we emit a function called "__rustc_link_guard_<crate-name>_<crate-svh>" - The body of this function contains calls to the "__rustc_link_guard" functions of all dependencies. - An executable contains a call to it's own "__rustc_link_guard" function. As a consequence the "__rustc_link_guard" function call graph mirrors the crate graph and the dynamic linker will fail if a wrong dylib is loaded somewhere because its "__rustc_link_guard" function will contain a different SVH in its name.
13 lines
680 B
Makefile
13 lines
680 B
Makefile
-include ../tools.mk
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all:
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-mkdir -p $(TMPDIR)/good
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-mkdir -p $(TMPDIR)/bad
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$(BARE_RUSTC) ./good/lib.rs -C prefer-dynamic --out-dir="$(TMPDIR)/good"
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$(BARE_RUSTC) ./bad/lib.rs -C prefer-dynamic --out-dir="$(TMPDIR)/bad"
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$(BARE_RUSTC) -L "$(TMPDIR)/good" -C prefer-dynamic -Crpath ./main.rs --out-dir="$(TMPDIR)"
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# This should succeed because the correct library is in LD_LIBRARY_PATH
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$(LD_LIB_PATH_ENVVAR)="$(TMPDIR)/good:$($(LD_LIB_PATH_ENVVAR))" $(TMPDIR)/main
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# This should fail because the wrong library is in LD_LIBRARY_PATH
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OUTPUT=`$(LD_LIB_PATH_ENVVAR)="$(TMPDIR)/bad:$($(LD_LIB_PATH_ENVVAR))" $(TMPDIR)/main || exit 0`
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if ["$(OUTPUT)" == "bad"]; then exit 1; fi
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