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arm: support softfloat in GOARM environment variable

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This adds softfloat support to GOARM, as proposed here:
https://github.com/golang/go/issues/61588

This is similar to https://github.com/tinygo-org/tinygo/pull/4189 but
with a few differences:

  * It is based on the work to support MIPS softfloat.
  * It fixes the issue that the default changed to softfloat everywhere.
    This PR defaults to softfloat on ARMv5 and hardfloat on ARMv6 and
    ARMv7.
  * It also compiles the C libraries (compiler-rt, musl) using the same
    soft/hard floating point support. This is important because
    otherwise a GOARM=7,softfloat binary could still contain hardware
    floating point instructions.
This commit is contained in:
Ayke van Laethem
2024-07-31 14:17:24 +02:00
committed by Ron Evans
parent a35b983a5d
commit 4dc07d6cc3
3 changed files with 60 additions and 8 deletions
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builder/builder_test.go
+6 -3
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@@ -53,9 +53,12 @@ func TestClangAttributes(t *testing.T) {
for _, options := range []*compileopts.Options{
{GOOS: "linux", GOARCH: "386"},
{GOOS: "linux", GOARCH: "amd64"},
{GOOS: "linux", GOARCH: "arm", GOARM: "5"},
{GOOS: "linux", GOARCH: "arm", GOARM: "6"},
{GOOS: "linux", GOARCH: "arm", GOARM: "7"},
{GOOS: "linux", GOARCH: "arm", GOARM: "5,softfloat"},
{GOOS: "linux", GOARCH: "arm", GOARM: "6,softfloat"},
{GOOS: "linux", GOARCH: "arm", GOARM: "7,softfloat"},
{GOOS: "linux", GOARCH: "arm", GOARM: "5,hardfloat"},
{GOOS: "linux", GOARCH: "arm", GOARM: "6,hardfloat"},
{GOOS: "linux", GOARCH: "arm", GOARM: "7,hardfloat"},
{GOOS: "linux", GOARCH: "arm64"},
{GOOS: "linux", GOARCH: "mips", GOMIPS: "hardfloat"},
{GOOS: "linux", GOARCH: "mipsle", GOMIPS: "hardfloat"},