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cmd/compile: add -env key=value flag

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This flag is not terribly useful with the go command, which will pass
all environment variables through to subprocesses it invokes,
but it can be useful in other build systems, notably blaze and bazel,
to pass compiler-debugging variables like GOSSAFUNC through to
the compiler.

We have been maintaining this as a patch against Google's internal
toolchain for many years, and it has proven useful in those non-go-command
contexts.

Change-Id: Ic123193319f3c838a694eda2575347c516b85ac7
Reviewed-on: https://go-review.googlesource.com/c/go/+/507977
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
This commit is contained in:
Russ Cox 2023-07-05 15:11:41 -04:00
parent e34de96d58
commit c14655da98
1 changed files with 10 additions and 0 deletions
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10
src/cmd/compile/internal/base/flag.go
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@ -98,6 +98,7 @@ type CmdFlags struct {
DwarfLocationLists *bool "help:\"add location lists to DWARF in optimized mode\"" // &Ctxt.Flag_locationlists, set below
Dynlink *bool "help:\"support references to Go symbols defined in other shared libraries\"" // &Ctxt.Flag_dynlink, set below
EmbedCfg func(string) "help:\"read go:embed configuration from `file`\""
Env func(string) "help:\"add `definition` of the form key=value to environment\""
GenDwarfInl int "help:\"generate DWARF inline info records\"" // 0=disabled, 1=funcs, 2=funcs+formals/locals
GoVersion string "help:\"required version of the runtime\""
ImportCfg func(string) "help:\"read import configuration from `file`\""
@ -143,6 +144,14 @@ type CmdFlags struct {
}
}
func addEnv(s string) {
i := strings.Index(s, "=")
if i < 0 {
log.Fatal("-env argument must be of the form key=value")
}
os.Setenv(s[:i], s[i+1:])
}
// ParseFlags parses the command-line flags into Flag.
func ParseFlags() {
Flag.I = addImportDir
@ -158,6 +167,7 @@ func ParseFlags() {
*Flag.DwarfLocationLists = true
Flag.Dynlink = &Ctxt.Flag_dynlink
Flag.EmbedCfg = readEmbedCfg
Flag.Env = addEnv
Flag.GenDwarfInl = 2
Flag.ImportCfg = readImportCfg
Flag.CoverageCfg = readCoverageCfg