Cannot recognized some armv7 Android devices

[yrom]

I'm using Flutter 1.12.13. My Flutter app crashes on some user's devices caused by Unrecognized ARM CPU architecture:

E Dart : ../../third_party/dart/runtime/vm/cpu_arm.cc: 181: error: Unrecognized ARM CPU architecture.

The Flutter 1.12.13 depends on a4911c6.
Related issue flutter/flutter#47819.

And I notice that code of cpu_arm.cc:

sdk/runtime/vm/cpu_arm.cc

Lines 174 to 176 in a4911c6

	} else if (CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv7") ||
	CpuInfo::FieldContains(kCpuInfoModel, "ARMv7")) {
	arm_version_ = ARMv7;

...has a little difference between thecpufeatures/cpu-features.c in Android NDK souces which detecting armv7 architecture from the "CPU Architecture" field:

       char* cpuArch = extract_cpuinfo_field(cpuinfo, cpuinfo_len, "CPU architecture");

        if (cpuArch != NULL) {
            char*  end;
            long   archNumber;
            int    hasARMv7 = 0;

            D("found cpuArch = '%s'\n", cpuArch);

            /* read the initial decimal number, ignore the rest */
            archNumber = strtol(cpuArch, &end, 10);

            /* Note that ARMv8 is upwards compatible with ARMv7. */
            if (end > cpuArch && archNumber >= 7) {
                hasARMv7 = 1;
            }

           //...omitted 

            if (hasARMv7) {
                g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_ARMv7;
            }

Also, I'm curious why Dart VM does not use cpu_features for detection.

[ghost]

This issue was moved by keertip to flutter/flutter#48347.