arm-none-eabi-gcc (Arm GNU Toolchain 15.3.Rel1 (Build arm-15.149))

[patrikgafvert]

Adafruit CircuitPython 10.3.0 on 2026-09-01; Raspberry Pi Pico 2 W with rp2350a

Just what to inform to the community with the new gcc compiler you need to add this
to your compile make line.

CFLAGS="-Wno-array-bounds" make BOARD=raspberry_pi_pico2_w

Or patch the file ports/raspberrypi/Makefile

@@ -728,7 +728,8 @@
 # are compiled out.
 $(patsubst %.c,$(BUILD)/%.o,$(SRC_MBEDTLS)) $(OBJ_MBEDTLS): CFLAGS += \
 	-Wno-suggest-attribute=format \
-	-Wno-unused-but-set-variable
+	-Wno-unused-but-set-variable \
+	-Wno-array-bounds
 else
 OBJ_MBEDTLS :=
 endif

[dhalbert]

Does 15.2Rel1 not show this warning?

[patrikgafvert]

Sorry not tested the prev version.

With the new gcc, the compilation stops with this warning, so you have to disable array-bounds warnings.
To make complete compilation.

Here the error/warning message:

In file included from ../../lib/mbedtls/tf-psa-crypto/drivers/builtin/src/gcm.c:18:
In function 'mbedtls_xor_no_simd',
    inlined from 'gcm_mult_smalltable' at ../../lib/mbedtls/tf-psa-crypto/drivers/builtin/src/gcm.c:317:5:
../../lib/mbedtls/tf-psa-crypto/core/tf_psa_crypto_common.h:370:17: error: array subscript 16 is outside array bounds of 'uint64_t[2]' {aka 'long long unsigned int[2]'} [-Werror=array-bounds=]
  370 |         r[i] = a[i] ^ b[i];
      |                ~^~~
../../lib/mbedtls/tf-psa-crypto/drivers/builtin/src/gcm.c: In function 'gcm_mult_smalltable':
../../lib/mbedtls/tf-psa-crypto/drivers/builtin/src/gcm.c:304:14: note: at offset 16 into object 'u64z' of size 16
  304 |     uint64_t u64z[2];
      |              ^~~~
In function 'mbedtls_xor_no_simd',
    inlined from 'gcm_mult_smalltable' at ../../lib/mbedtls/tf-psa-crypto/drivers/builtin/src/gcm.c:317:5:
../../lib/mbedtls/tf-psa-crypto/core/tf_psa_crypto_common.h:370:14: error: array subscript 16 is outside array bounds of 'uint64_t[2]' {aka 'long long unsigned int[2]'} [-Werror=array-bounds=]
  370 |         r[i] = a[i] ^ b[i];
      |         ~~~~~^~~~~~~~~~~~~
../../lib/mbedtls/tf-psa-crypto/drivers/builtin/src/gcm.c: In function 'gcm_mult_smalltable':
../../lib/mbedtls/tf-psa-crypto/drivers/builtin/src/gcm.c:304:14: note: at offset 16 into object 'u64z' of size 16
  304 |     uint64_t u64z[2];
      |              ^~~~
cc1: all warnings being treated as errors

[dhalbert]

Thanks - I thought we were already using 15.3Rel1 but I see we are still on 15.2Rel1. I incorrectly recently updated the Learn Guide to say 15.3Rel1. [WRONG: I updated the Guide from 14.something to 15.2Rel1.]

[dhalbert]

I'll see about updating, and take your patch. Appreciate it.

[patrikgafvert]

I see this as a workaround for now until the developer of mbedtls has fixed their code.
Trying to run the latest which is the greatest.
I'm not a developer myself.
Whether it's a type casting problem or not.

Thanks a lot of a great app/program(yes I am so old).