RISCV compressed instruction mode renamed between 5.x and 6.x

[peace-maker]

Work environment

Questions	Answers
System Capstone runs on OS/arch/bits	Ubuntu x86_64
Capstone module affected	riscv
Source of Capstone	pip
Version/git commit	6.0.0a9

Expected behavior

Code using the CS_MODE_RISCVC constant in capstone 5 fails to compile against capstone 6. The constant was renamed to CS_MODE_RISCV_C in #2756

V5:

capstone/include/capstone/capstone.h

Lines 222 to 224 in e17ee44

	CS_MODE_RISCV32 = 1 << 0, ///< RISCV RV32G
	CS_MODE_RISCV64 = 1 << 1, ///< RISCV RV64G
	CS_MODE_RISCVC = 1 << 2, ///< RISCV compressed instructure mode

V6:

capstone/include/capstone/capstone.h

Lines 259 to 261 in 8b2772f

	CS_MODE_RISCV32 = 1 << 0, ///< RISCV RV32G
	CS_MODE_RISCV64 = 1 << 1, ///< RISCV RV64G
	CS_MODE_RISCV_C = 1 << 2, ///< RISCV compressed instructure mode

There is no CAPSTONE_RISCV_COMPAT_HEADER define to bring back the old name similar to the one for Aarch64 and systemz. The code is expected to compile.

cstest has a legacy mapping for the old name

capstone/suite/cstest/include/test_mapping.h

Lines 172 to 176 in 8b2772f

	{ .str = "CS_MODE_RISCV32", .val = CS_MODE_RISCV32 },
	{ .str = "CS_MODE_RISCV64", .val = CS_MODE_RISCV64 },
	{ .str = "CS_MODE_RISCVC", .val = CS_MODE_RISCV_C },
	{ .str = "CS_MODE_RISCV_A", .val = CS_MODE_RISCV_A },
	{ .str = "CS_MODE_RISCV_C", .val = CS_MODE_RISCV_C },

Actual behavior

The CS_MODE_RISCVC name is not found, compilation aborts. Similarly in the Python bindings.

Steps to reproduce the behavior

(Testing with Python due to JonathanSalwan/ROPgadget#223)

from capstone import *
print(CS_MODE_RISCVC)

[Rot127]

@moste00 Could you please extend the compatibility header generator for that case.
We also use it for AArch64 and SystemZ.
@peace-maker If you find more of those issues please let use know.

[namhyung]

Hello, this also breaks Linux perf tools.

https://lore.kernel.org/r/20260713-perf_fix_capstone_build-v1-1-796ea08c04db@arm.com

[Rot127]

Either me or @moste00 will fix it in the next days with a compatibility header.
I put it on my "notify me daily until it is done" todo list.

[moste00]

Hello, sorry for not responding quickly

I will do this either today or tomorrow. Thank you all for reporting..

@Rot127 @namhyung @peace-maker

[moste00]

@Rot127 please see the linked PR

[Rot127]

Will draft a patch release tomorrow.