IAR build fixes before 1.1.0/4.1.0/3.6.6: framework support

[gilles-peskine-arm]

Fix the build of the library and the unit tests with IAR.

Also fix a problem with the structure of test helper code that I introduced in #279 and which is causing me a problem in a security fix: part of test_common.h should have been in tests/src, not tests/include/test.

PR checklist

• changelog not required because: I don't think we should make any official promise that the IAR build is fixed since it isn't validated by a CI job
• development PR provided IAR build fixes after 4.1.0 mbedtls#10635
• TF-PSA-Crypto PR provided Backport 1.1: IAR build fixes after 1.1.0 TF-PSA-Crypto#708
• framework PR provided IAR build fixes before 1.1.0/4.1.0/3.6.6: framework support #289
• 3.6 PR provided Backport 3.6: IAR build fixes after 3.6.6 mbedtls#10636
• tests built (but did not link) the library, the unit test support code and the unit tests (but not the programs) in the baremetal config with IAR 9.40 for Arm

[Copilot]

Pull request overview

This PR fixes IAR build issues for the library/unit tests by restructuring test build-configuration includes and adding IAR-specific compatibility knobs in the test harness.

Changes:

• Introduce tests/include/test/build_info.h and switch test headers to include it (instead of test_common.h) for consistent build configuration and private-access support.
• Move C-file-only setup into tests/src/test_common.h and ensure test .c files include it first.
• Add IAR-specific defines and warning suppression for successful compilation with IAR.

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/src/threading_helpers.c	Include test_common.h first for consistent compiler/test setup.
tests/src/test_memory.c	Include test_common.h first for consistent compiler/test setup.
tests/src/test_common.h	Add IAR _DLIB_FILE_DESCRIPTOR define; include test/build_info.h for test build config.
tests/src/random.c	Include test_common.h first for consistent compiler/test setup.
tests/src/psa_memory_poisoning_wrappers.c	Include test_common.h first for consistent compiler/test setup.
tests/src/psa_exercise_key.c	Include test_common.h; suppress an IAR-specific diagnostic.
tests/src/psa_crypto_stubs.c	Include test_common.h first for consistent compiler/test setup.
tests/src/psa_crypto_helpers.c	Include test_common.h first for consistent compiler/test setup.
tests/src/pk_helpers.c	Include test_common.h first for consistent compiler/test setup.
tests/src/helpers.c	Include test_common.h first for consistent compiler/test setup.
tests/src/fake_external_rng_for_test.c	Include test_common.h first for consistent compiler/test setup.
tests/src/bignum_helpers.c	Replace direct private-access define with test_common.h include.
tests/src/bignum_codepath_check.c	Include test_common.h first for consistent compiler/test setup.
tests/src/asn1_helpers.c	Include test_common.h first for consistent compiler/test setup.
tests/include/test/threading_helpers.h	Switch to including new build_info.h (test header build config).
tests/include/test/random.h	Switch to including new build_info.h (test header build config).
tests/include/test/psa_memory_poisoning_wrappers.h	Switch to including new build_info.h (test header build config).
tests/include/test/psa_helpers.h	Switch to including new build_info.h (test header build config).
tests/include/test/psa_exercise_key.h	Switch to including new build_info.h (test header build config).
tests/include/test/psa_crypto_helpers.h	Switch to including new build_info.h (test header build config).
tests/include/test/pk_helpers.h	Switch to including new build_info.h (test header build config).
tests/include/test/memory.h	Switch to including new build_info.h (test header build config).
tests/include/test/macros.h	Switch to including new build_info.h (test header build config).
tests/include/test/helpers.h	Switch to including new build_info.h (test header build config).
tests/include/test/fake_external_rng_for_test.h	Switch to including new build_info.h (test header build config).
tests/include/test/constant_flow.h	Switch to including new build_info.h (test header build config).
tests/include/test/build_info.h	New header centralizing test header build configuration and private-access enablement.
tests/include/test/bignum_helpers.h	Switch to including new build_info.h (test header build config).
tests/include/test/bignum_codepath_check.h	Switch to including new build_info.h (test header build config).
tests/include/test/asn1_helpers.h	Switch to including new build_info.h (test header build config).
tests/include/test/arguments.h	Switch to including new build_info.h (test header build config).

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[valeriosetti]

The only current failure on the CI (DTLS proxy: 3d, gnutls client, fragmentation, nbio=2) looks spurious and changes look good to me, so I approve

[gilles-peskine-arm]

I've restarted the CI since we want to see it pass.

[bjwtaylor]

Looks good as long as we can get the CI to pass.