CONFIG_STDATOMIC_S32C1I_SPIRAM_WORKAROUND missing implementation for __atomic_test_and_set, breaks stdatomic (IDFGH-14597)

[nebkat]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

v5.4

Operating System used.

Windows

How did you build your project?

Command line with idf.py

If you are using Windows, please specify command line type.

PowerShell

What is the expected behavior?

std::atomic_flag / stdatomic.h should work with CONFIG_SPIRAM=y.

What is the actual behavior?

Linker error: undefined reference to '__atomic_test_and_set'.

Steps to reproduce.

1. Clone https://github.com/nebkat/esp-idf-stdatomic-bug
2. idf.py @profile/spiram build

Build or installation Logs.

FAILED: hello_world.elf
C:\WINDOWS\system32\cmd.exe /C "cd . && C:\Espressif\tools\xtensa-esp-elf\esp-14.2.0_20241119\xtensa-esp-elf\bin\xtensa-esp32s3-elf-g++.exe -mlongcalls  -fno-builtin-memcpy -fno-builtin-memset -fno-builtin-bzero -fno-builtin-stpcpy -fno-builtin-strncpy -Wl,--cref -Wl,--defsym=IDF_TARGET_ESP32S3=0 -Wl,--Map=C:/Espressif/frameworks/esp-idf-v5.4/examples/get-started/hello_world/build/spiram/hello_world.map -Wl,--no-warn-rwx-segments -Wl,--orphan-handling=warn -fno-rtti -fno-lto -Wl,--gc-sections -Wl,--warn-common -T esp32s3.peripherals.ld -T esp32s3.rom.ld -T esp32s3.rom.api.ld -T esp32s3.rom.bt_funcs.ld -T esp32s3.rom.libgcc.ld -T esp32s3.rom.wdt.ld -T esp32s3.rom.version.ld -T esp32s3.rom.newlib.ld -T memory.ld -T sections.ld @CMakeFiles\hello_world.elf.rsp -o hello_world.elf && cd ."
C:/Espressif/tools/xtensa-esp-elf/esp-14.2.0_20241119/xtensa-esp-elf/bin/../lib/gcc/xtensa-esp-elf/14.2.0/../../../../xtensa-esp-elf/bin/ld.exe: esp-idf/main/libmain.a(hello_world_main.c.obj):(.literal.app_main+0x0): undefined reference to `__atomic_test_and_set'
C:/Espressif/tools/xtensa-esp-elf/esp-14.2.0_20241119/xtensa-esp-elf/bin/../lib/gcc/xtensa-esp-elf/14.2.0/../../../../xtensa-esp-elf/bin/ld.exe: esp-idf/main/libmain.a(hello_world_main.c.obj): in function `app_main':
C:/Espressif/frameworks/esp-idf-v5.4/examples/get-started/hello_world/main/hello_world_main.c:12:(.text.app_main+0xc): undefined reference to `__atomic_test_and_set'
collect2.exe: error: ld returned 1 exit status

More Information.

See also:

• stdatomic.h incompatible with PSRAM (IDFGH-2549) #4635

Appears to be introduced by 4f09fba, no linker error when reverted.

[Lapshin]

@nebkat , thank you for the report. The issue #15167 has already been fixed in the master branch and backport is on its way to v5.4.
You may cherry-pick the commit 793e394 until the backport is not in place.

[nebkat]

Damn I must have never jumped to the closed issues tab to see that issue 😢 Thanks @Lapshin