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Recognize RISCV_WITH_RVV env var on RISC-V to set WITH_RVV cmake var #218

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merged 8 commits into from
Sep 23, 2024
Merged

Recognize RISCV_WITH_RVV env var on RISC-V to set WITH_RVV cmake var #218

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3a1ea59
Basic idea for `rvv-off` feature
EliahKagan Sep 7, 2024
d76bc6d
Also recognize an environment variable
EliahKagan Sep 7, 2024
377b942
Document that `rvv-off` feature is experimental and needs `cmake`
EliahKagan Sep 8, 2024
a8c813e
Document `RVV_OFF` environment variable in `rvv-off` comments
EliahKagan Sep 8, 2024
7579d46
Remove `rvv-off` feature
EliahKagan Sep 22, 2024
dbbe477
Use `RISCV_WITH_RVV` as the env var, taking ON/OFF values
EliahKagan Sep 22, 2024
66df3f5
Say why it occasionally makes sense to force RVV off
EliahKagan Sep 22, 2024
8636464
Fix up the environment variable string conversion
EliahKagan Sep 22, 2024
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Also recognize an environment variable 
To aid in testing, and possibly as something that should even be
kept in some form, this checks if an `RVV_OFF` environment variable
is set and, if so, behaves as though the `rvv-off` feature is
enabled, whether that feature is actually enabled or not.
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@EliahKagan
EliahKagan committed Sep 22, 2024
commit d76bc6d74e92fc21653906fe2ec1d3d342fbf887
2 changes: 1 addition & 1 deletion zng/cmake.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@ pub fn build_zlib_ng(target: &str, compat: bool) {
.define("WITH_DFLTCC_INFLATE", "1")
.cflag("-DDFLTCC_LEVEL_MASK=0x7e");
}
if cfg!(feature = "rvv-off") && target.contains("riscv64") {
if target.contains("riscv64") && (cfg!(feature = "rvv-off") || env::var_os("RVV_OFF").is_some()) {
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Generally I prefer "positive" features over "negative" features. By this I mean that the feature sounds like it adds something rather than taking something away.

For example, you could name the environment variable WITH_RVV and allowing the values ON and OFF. This would be familiar to someone who knows the zlib-ng build. It would allow forcing the use of RVV if there was ever a case where it was disabled.

You could name the feature with-rvv. However this would require the default to compile without RVV. This has the advantage of working in more places, at the cost of behaving differently to the default behavior of zlib-ng.

cmake.define("WITH_RVV", "OFF");
}
if target == "i686-pc-windows-msvc" {
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