Fix build/runtime API level for static exe tests.

Static executable tests need this to run correctly. They need to build
against the newest API level (there's only one libc.a, which the headers
and CRT objects need to match), but can run against any API level.

We've been getting away with this for a while because it wasn't as
strict, but libc.a now has a dependency on ELF TLS, so we need the newer
CRT objects. We were further getting away with it because --gc-sections
was stripping the ELF TLS dependency.

Bug: android/ndk#1813
Test: this is the test, now it passes
Change-Id: Icc984f9fa3dc83ecd8c3dca8789be55bcb487119

tests/device/static-executable-exceptions/jni/Application.mk

@@ -1 +1 @@
-APP_PLATFORM := android-21
+APP_PLATFORM := latest

tests/device/static-executable-exceptions/test_config.py

@@ -1,7 +1,13 @@
-def build_unsupported(test):
-    # Static executables with libc++ require targeting a new enough API level
-    # to not need libandroid_support.
-    if test.config.api < 21:
-        return f"android-{test.config.api}"
+import ndk.abis
+from ndk.test.buildtest.case import Test
 
-    return None
+
+def extra_cmake_flags() -> list[str]:
+    # Required for static executables.
+    return ["-DANDROID_PLATFORM=latest"]
+
+
+def override_runtime_minsdkversion(test: Test) -> int | None:
+    # We build as latest because static executables require that, but static executables
+    # are compatible with old OS versions.
+    return ndk.abis.min_api_for_abi(test.config.abi)

tests/device/static-executable/jni/Application.mk

@@ -0,0 +1 @@
+APP_PLATFORM := latest

tests/device/static-executable/test_config.py

@@ -1,5 +1,13 @@
-def extra_cmake_flags():
-    # Match the ndk-build test. Using libc++ here would require us to target a
-    # newer API level since static executables and libandroid_support don't
-    # mix.
-    return ["-DANDROID_STL=system"]
+import ndk.abis
+from ndk.test.buildtest.case import Test
+
+
+def extra_cmake_flags() -> list[str]:
+    # Required for static executables.
+    return ["-DANDROID_PLATFORM=latest"]
+
+
+def override_runtime_minsdkversion(test: Test) -> int | None:
+    # We build as latest because static executables require that, but static executables
+    # are compatible with old OS versions.
+    return ndk.abis.min_api_for_abi(test.config.abi)