Support native Arm32 bootstrapping

[jserv]

When bootstrapping on a native Arm32 host, qemu-arm is unnecessary. Therefore, in this configuration, we disregard ARM_EXEC.

[jserv]

@vacantron, The Raspberry Pi 3 represents a unique scenario. Its foundational architecture is rooted in Armv8-A; however, it possesses the inherent ability to directly execute Aarch32 programs. This is due to its dual support for both A64 and A32 instruction sets. Kindly verify if this examination suffices for differentiation.

[jserv]

The proposed change on an emulated Debian/Arm32 causes the following error:

tests/driver.sh: line 16:   708 Segmentation fault      "$SHECC" -o "$tmp_exe" "$tmp_in"
int main(int argc, int argv) { int x; x=0; do {x = x + 1; break;} while (1); return x; } => 1 expected, but got 0
input: /tmp/tmp.0FeGO67p2r.c
executable: /tmp/tmp.aoTvmAkSFV

[vacantron]

@vacantron, The Raspberry Pi 3 represents a unique scenario. Its foundational architecture is rooted in Armv8-A; however, it possesses the inherent ability to directly execute Aarch32 programs. This is due to its dual support for both A64 and A32 instruction sets. Kindly verify if this examination suffices for differentiation.

Yes, it works on Raspberry Pi 3B.

The proposed change on an emulated Debian/Arm32 causes the following error:

I use the image for armhf-virt on DQIB and run it on QEMU. There's no error occurred (and also on Raspberry Pi). Any further information for reproducing the error?

Also, the proposed changes should not change the behavior of shecc. Is the version correct?

[jserv]

I use the image for armhf-virt on DQIB and run it on QEMU. There's no error occurred (and also on Raspberry Pi). Any further information for reproducing the error?

Here are the steps to reproduce:

1. Fetch Debian image for armhf-virt and extract it.
2. Boot into the armhf-virt environment and run apt-get update ; apt-get dist-upgrade ; apt-get install build-essential to get latest GNU toolchain. In my case, gcc version is 13.2.0 (Debian 13.2.0-8).
3. Clone git repository of shecc and execute git checkout -b native-arm-bootstrapping origin/native-arm-bootstrapping
4. Run make config and make check
5. Then, I got the above messages.

[vacantron]

The proposed change on an emulated Debian/Arm32 causes the following error:

There's same error on the other platforms, but it only report the segmentation fault and not stop the checking. I had not noticed it until today. Fixed in #91 .