40 lines
1.8 KiB
Makefile
40 lines
1.8 KiB
Makefile
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# Common Makefile include for Rust `run-make-fulldeps/instrument-coverage-* tests. Include this
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# file with the line:
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#
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# -include ../instrument-coverage/coverage_tools.mk
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#
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# To enable the Rust compiler option `-C link-dead-code`, also set the following variable
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# *BEFORE* the `-include` line:
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#
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# LINK_DEAD_CODE=yes
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-include ../tools.mk
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ifndef LINK_DEAD_CODE
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LINK_DEAD_CODE=no
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endif
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# ISSUE(76038): When targeting MSVC, Rust binaries built with both `-Z instrument-coverage` and
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# `-C link-dead-code` typically crash (with a seg-fault) or at best generate an empty `*.profraw`
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# file, required for coverage reports.
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#
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# Enabling `-C link-dead-code` is preferred when compiling with `-Z instrument-coverage`, so
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# `-C link-dead-code` is automatically enabled for all platform targets _except_ MSVC.
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#
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# Making the state of `-C link-dead-code` platform-dependent creates a problem for cross-platform
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# tests because the injected counters, coverage reports, and some low-level output can be different,
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# depending on the `-C link-dead-code` setting. For example, coverage reports will not report any
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# coverage for a dead code region when the `-C link-dead-code` option is disabled, but with the
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# option enabled, those same regions will show coverage counter values (of zero, of course).
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#
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# To ensure cross-platform `-Z instrument-coverage` generate consistent output, the
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# `-C link-dead-code` option is always explicitly enabled or disabled.
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#
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# Since tests that execute binaries enabled with both `-Z instrument-coverage` and
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# `-C link-dead-code` are known to fail, those tests will need the `# ignore-msvc` setting.
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#
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# If and when the above issue is resolved, the `# ignore-msvc` option can be removed, and the
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# tests can be simplified to always test with `-C link-dead-code`.
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UNAME = $(shell uname)
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