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targets: add CPU property everywhere

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This is for consistency with Clang, which always adds a CPU flag even if
it's not specified in CFLAGS.

This commit also adds some tests to make sure the Clang target-cpu
matches the CPU property in the JSON files.

This does have an effect on the generated binaries. The effect is very
small though: on average just 0.2% increase in binary size, apparently
because Cortex-M3 and Cortex-M4 are compiled a bit differently. However,
when rebased on top of https://github.com/tinygo-org/tinygo/pull/2218
(minsize), the difference drops to -0.1% (a slight decrease on average).
This commit is contained in:
Ayke van Laethem
2021-11-01 19:11:04 +01:00
committed by Ron Evans
parent c2165f74d8
commit 29206cf0a4
21 changed files with 174 additions and 28 deletions
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compileopts/config.go
+13
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@@ -220,6 +220,19 @@ func (c *Config) CFlags() []string {
cflags = append(cflags, "-O"+c.Options.Opt)
// Set the LLVM target triple.
cflags = append(cflags, "--target="+c.Triple())
// Set the -mcpu (or similar) flag.
if c.Target.CPU != "" {
if c.GOARCH() == "amd64" || c.GOARCH() == "386" {
// x86 prefers the -march flag (-mcpu is deprecated there).
cflags = append(cflags, "-march="+c.Target.CPU)
} else if strings.HasPrefix(c.Triple(), "avr") {
// AVR MCUs use -mmcu instead of -mcpu.
cflags = append(cflags, "-mmcu="+c.Target.CPU)
} else {
// The rest just uses -mcpu.
cflags = append(cflags, "-mcpu="+c.Target.CPU)
}
}
return cflags
}