Export variant/features via soong_injection
Test: build/bazel/ci/bp2build.sh
Change-Id: If70043dc9d020d5f4a243ba4b192b99c9c7e8563
diff --git a/cc/config/bp2build.go b/cc/config/bp2build.go
index eca5161..73f65f5 100644
--- a/cc/config/bp2build.go
+++ b/cc/config/bp2build.go
@@ -38,6 +38,8 @@
exportedStringListVars = exportedStringListVariables{}
exportedStringVars = exportedStringVariables{}
exportedStringListDictVars = exportedStringListDictVariables{}
+ // Note: these can only contain references to other variables and must be printed last
+ exportedVariableReferenceDictVars = exportedVariableReferenceDictVariables{}
/// Maps containing variables that are dependent on the build config.
exportedConfigDependingVars = exportedConfigDependingVariables{}
@@ -62,6 +64,7 @@
type bazelConstant struct {
variableName string
internalDefinition string
+ sortLast bool
}
type exportedStringVariables map[string]string
@@ -168,6 +171,36 @@
return ret
}
+type exportedVariableReferenceDictVariables map[string]map[string]string
+
+func (m exportedVariableReferenceDictVariables) Set(k string, v map[string]string) {
+ m[k] = v
+}
+
+func (m exportedVariableReferenceDictVariables) asBazel(_ android.Config, _ exportedStringVariables,
+ _ exportedStringListVariables, _ exportedConfigDependingVariables) []bazelConstant {
+ ret := make([]bazelConstant, 0, len(m))
+ for n, dict := range m {
+ for k, v := range dict {
+ matches, err := variableReference(v)
+ if err != nil {
+ panic(err)
+ } else if !matches.matches {
+ panic(fmt.Errorf("Expected a variable reference, got %q", v))
+ } else if len(matches.fullVariableReference) != len(v) {
+ panic(fmt.Errorf("Expected only a variable reference, got %q", v))
+ }
+ dict[k] = "_" + matches.variable
+ }
+ ret = append(ret, bazelConstant{
+ variableName: n,
+ internalDefinition: starlark_fmt.PrintDict(dict, 0),
+ sortLast: true,
+ })
+ }
+ return ret
+}
+
// BazelCcToolchainVars generates bzl file content containing variables for
// Bazel's cc_toolchain configuration.
func BazelCcToolchainVars(config android.Config) string {
@@ -175,7 +208,8 @@
config,
exportedStringListDictVars,
exportedStringListVars,
- exportedStringVars)
+ exportedStringVars,
+ exportedVariableReferenceDictVars)
}
func bazelToolchainVars(config android.Config, vars ...bazelVarExporter) string {
@@ -186,7 +220,12 @@
results = append(results, v.asBazel(config, exportedStringVars, exportedStringListVars, exportedConfigDependingVars)...)
}
- sort.Slice(results, func(i, j int) bool { return results[i].variableName < results[j].variableName })
+ sort.Slice(results, func(i, j int) bool {
+ if results[i].sortLast != results[j].sortLast {
+ return !results[i].sortLast
+ }
+ return results[i].variableName < results[j].variableName
+ })
definitions := make([]string, 0, len(results))
constants := make([]string, 0, len(results))
@@ -207,6 +246,32 @@
return ret
}
+type match struct {
+ matches bool
+ fullVariableReference string
+ variable string
+}
+
+func variableReference(input string) (match, error) {
+ // e.g. "${ExternalCflags}"
+ r := regexp.MustCompile(`\${(?:config\.)?([a-zA-Z0-9_]+)}`)
+
+ matches := r.FindStringSubmatch(input)
+ if len(matches) == 0 {
+ return match{}, nil
+ }
+ if len(matches) != 2 {
+ return match{}, fmt.Errorf("Expected to only match 1 subexpression in %s, got %d", input, len(matches)-1)
+ }
+ return match{
+ matches: true,
+ fullVariableReference: matches[0],
+ // Index 1 of FindStringSubmatch contains the subexpression match
+ // (variable name) of the capture group.
+ variable: matches[1],
+ }, nil
+}
+
// expandVar recursively expand interpolated variables in the exportedVars scope.
//
// We're using a string slice to track the seen variables to avoid
@@ -216,8 +281,6 @@
// interpolation stacks are deep (n > 1).
func expandVar(config android.Config, toExpand string, stringScope exportedStringVariables,
stringListScope exportedStringListVariables, exportedVars exportedConfigDependingVariables) ([]string, error) {
- // e.g. "${ExternalCflags}"
- r := regexp.MustCompile(`\${([a-zA-Z0-9_]+)}`)
// Internal recursive function.
var expandVarInternal func(string, map[string]bool) (string, error)
@@ -225,20 +288,18 @@
var ret string
remainingString := toExpand
for len(remainingString) > 0 {
- matches := r.FindStringSubmatch(remainingString)
- if len(matches) == 0 {
+ matches, err := variableReference(remainingString)
+ if err != nil {
+ panic(err)
+ }
+ if !matches.matches {
return ret + remainingString, nil
}
- if len(matches) != 2 {
- panic(fmt.Errorf("Expected to only match 1 subexpression in %s, got %d", remainingString, len(matches)-1))
- }
- matchIndex := strings.Index(remainingString, matches[0])
+ matchIndex := strings.Index(remainingString, matches.fullVariableReference)
ret += remainingString[:matchIndex]
- remainingString = remainingString[matchIndex+len(matches[0]):]
+ remainingString = remainingString[matchIndex+len(matches.fullVariableReference):]
- // Index 1 of FindStringSubmatch contains the subexpression match
- // (variable name) of the capture group.
- variable := matches[1]
+ variable := matches.variable
// toExpand contains a variable.
if _, ok := seenVars[variable]; ok {
return ret, fmt.Errorf(