bp2build remove "-std" from cflags
Soong overrides "-std" flags when provided via cppflags or conlyflags;
however, any user-provided "-std=" cflag will be overridden by Soong's
std flag handling.
For Bazel, we _always_ allow user to override via user provided flags.
To prevent conflicts, we remove the silently ignored values from
Android.bp files in the bp2build conversion.
Test: build/bazel/ci/bp2build.sh
Test: build/bazel/ci/mixed_droid.sh
Change-Id: I4c33b2ae593a7ff3ff8e3ad15ef3461354fc0c83
diff --git a/cc/bp2build.go b/cc/bp2build.go
index fad40be..2119ee4 100644
--- a/cc/bp2build.go
+++ b/cc/bp2build.go
@@ -162,7 +162,7 @@
attrs := staticOrSharedAttributes{}
setAttrs := func(axis bazel.ConfigurationAxis, config string, props StaticOrSharedProperties) {
- attrs.Copts.SetSelectValue(axis, config, props.Cflags)
+ attrs.Copts.SetSelectValue(axis, config, parseCommandLineFlags(props.Cflags, filterOutStdFlag))
attrs.Srcs.SetSelectValue(axis, config, android.BazelLabelForModuleSrc(ctx, props.Srcs))
attrs.System_dynamic_deps.SetSelectValue(axis, config, bazelLabelForSharedDeps(ctx, props.System_shared_libs))
@@ -279,9 +279,18 @@
protoSrcs bazel.LabelListAttribute
}
-func parseCommandLineFlags(soongFlags []string) []string {
+type filterOutFn func(string) bool
+
+func filterOutStdFlag(flag string) bool {
+ return strings.HasPrefix(flag, "-std=")
+}
+
+func parseCommandLineFlags(soongFlags []string, filterOut filterOutFn) []string {
var result []string
for _, flag := range soongFlags {
+ if filterOut != nil && filterOut(flag) {
+ continue
+ }
// Soong's cflags can contain spaces, like `-include header.h`. For
// Bazel's copts, split them up to be compatible with the
// no_copts_tokenization feature.
@@ -308,10 +317,14 @@
ca.absoluteIncludes.SetSelectValue(axis, config, props.Include_dirs)
ca.localIncludes.SetSelectValue(axis, config, localIncludeDirs)
- ca.copts.SetSelectValue(axis, config, parseCommandLineFlags(props.Cflags))
- ca.asFlags.SetSelectValue(axis, config, parseCommandLineFlags(props.Asflags))
- ca.conlyFlags.SetSelectValue(axis, config, parseCommandLineFlags(props.Conlyflags))
- ca.cppFlags.SetSelectValue(axis, config, parseCommandLineFlags(props.Cppflags))
+ // In Soong, cflags occur on the command line before -std=<val> flag, resulting in the value being
+ // overridden. In Bazel we always allow overriding, via flags; however, this can cause
+ // incompatibilities, so we remove "-std=" flags from Cflag properties while leaving it in other
+ // cases.
+ ca.copts.SetSelectValue(axis, config, parseCommandLineFlags(props.Cflags, filterOutStdFlag))
+ ca.asFlags.SetSelectValue(axis, config, parseCommandLineFlags(props.Asflags, nil))
+ ca.conlyFlags.SetSelectValue(axis, config, parseCommandLineFlags(props.Conlyflags, nil))
+ ca.cppFlags.SetSelectValue(axis, config, parseCommandLineFlags(props.Cppflags, nil))
ca.rtti.SetSelectValue(axis, config, props.Rtti)
}