Versioned CRT objects are built with correct __ANDROID_API__
Background: `min_sdk_version` of a crt object is the oldest SDK version
that the crt object supports. When it's set to for example 16, Soong
creates a number of versioned variants of the crt object starting from
16 to the latest version. The variant for version X is provided to NDK
clients having `min_sdk_version` set to X.
Problem: all versioned variants of a crt object were built with `-target
<arch>-linux-android16`. Therefore they all have been with `#define __ANDROID_API__
16`. This is because the mutated variants still have the same
min_sdk_version property and the clang triple follows min_sdk_version,
not sdk_version. This is too conservative and against our intention to
provide the latest crt object that matches with the min_sdk_version of
the client.
In the other hand, the platform(non-sdk) variant of the crt object
doesn't have such a problem. min_sdk_version is completely ignored.
However, this is a bug and will be fixed by aosp/1640364. As a side
effect of the fixing, the platform variant will begin to built with a
very old __ANDROID_API__ which unnecessarily turns off the new platform
features like the TLS segment over-alignment.
This change fixes the problems:
* For the versioned variants of crt objects, we set both
`min_sdk_version` and `sdk_versio` to the version that the variant is
created for.
* For the platform variant of crt objects, `min_sdk_version` is force
reset to "current".
Bug: 183191008
Test: m
Change-Id: I8c9d0fcea816de8cd1532dac4a47eee4f726c037
diff --git a/cc/cc.go b/cc/cc.go
index cab7459..cb845a4 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -1363,6 +1363,19 @@
if ver == "apex_inherit" || ver == "" {
ver = ctx.sdkVersion()
}
+ // For crt objects, the meaning of min_sdk_version is very different from other types of
+ // module. For them, min_sdk_version defines the oldest version that the build system will
+ // create versioned variants for. For example, if min_sdk_version is 16, then sdk variant of
+ // the crt object has local variants of 16, 17, ..., up to the latest version. sdk_version
+ // and min_sdk_version properties of the variants are set to the corresponding version
+ // numbers. However, the platform (non-sdk) variant of the crt object is left untouched.
+ // min_sdk_version: 16 doesn't actually mean that the platform variant has to support such
+ // an old version. Since the variant is for the platform, it's preferred to target the
+ // latest version.
+ if ctx.mod.SplitPerApiLevel() && !ctx.isSdkVariant() {
+ ver = strconv.Itoa(android.FutureApiLevelInt)
+ }
+
// Also make sure that minSdkVersion is not greater than sdkVersion, if they are both numbers
sdkVersionInt, err := strconv.Atoi(ctx.sdkVersion())
minSdkVersionInt, err2 := strconv.Atoi(ver)
@@ -1933,9 +1946,14 @@
return nil
}
if m.UseSdk() {
+ // Choose the CRT that best satisfies the min_sdk_version requirement of this module
+ minSdkVersion := m.MinSdkVersion()
+ if minSdkVersion == "" || minSdkVersion == "apex_inherit" {
+ minSdkVersion = m.SdkVersion()
+ }
return []blueprint.Variation{
{Mutator: "sdk", Variation: "sdk"},
- {Mutator: "version", Variation: m.SdkVersion()},
+ {Mutator: "version", Variation: minSdkVersion},
}
}
return []blueprint.Variation{