Elastic Compute Service:Build Make and CMake files for YiTian ECS migration

Add the -mabi=lp64 option in C and C++

The x86 option -m64 compiles code as 64-bit but is not supported on YiTian instances. Replace -m64 with -mabi=lp64.

Use C and C++ to forcefully add the-fsigned-char compilation option

On x86, the default char type is signed char. On YiTian instances, the default is unsigned char. Add -fsigned-char to enforce signed char during migration.

Use C and C++ to specify processor architecture options

Replace the x86 march mtune mcpu options with -march=armv8-a+sve2 -mcpu=neoverse-n1 to generate optimized binaries for the YiTian instruction set.

Example

CFLAGS before and after migration from x86 to YiTian:

Code before modification:

CFLAGS=-g3 -O2 -DNDEBUG -m64  -Wall -march=corei7

Code after modification:

# GNU Compiler Collection (GCC) 10 (suitable for Neoverse N1)
CFLAGS=-g3 -O2 -DNDEBUG -mabi=lp64 -Wall -march=armv8-a+crc+sve2 -mcpu=neoverse-n1 -fsigned-char

# GCC 11 (suitable for Neoverse N2)
CFLAGS=-g3 -O2 -DNDEBUG -mabi=lp64 -Wall -march=armv8-a+crc+sve2 -mcpu=neoverse-n2 -fsigned-char