GCC fails to address files under long paths with UCRT

[stephanosio]

From #969 (comment):

Reverting "workaround for issue wih gdb/mingw" and making GCC build with the sdk-build MinGW toolchain seems to have made GCC misbehave for some Xtensa targets:

2025-07-22T12:27:55.7140088Z INFO    - The following issues were found (showing the top 10 items):
2025-07-22T12:27:55.7141297Z INFO    - 1) cpp.libcxx.glibcxx.picolibc on esp32_devkitc/esp32/procpu error (Build failure - error: bits/c++config.h: No such file or directory)
2025-07-22T12:27:55.7142281Z INFO    - 2) cpp.libcxx.glibcxx.picolibc on esp32s2_saola/esp32s2 error (Build failure - error: bits/c++config.h: No such file or directory)
2025-07-22T12:27:55.7143236Z INFO    - 3) cpp.libcxx.glibcxx.picolibc on esp32s3_devkitm/esp32s3/procpu error (Build failure - error: bits/c++config.h: No such file or directory)
2025-07-22T12:27:55.7144628Z INFO    - 4) cpp.libcxx.glibcxx.picolibc on imx8mp_evk/mimx8ml8/adsp error (Build failure - error: bits/c++config.h: No such file or directory)
2025-07-22T12:27:55.7145943Z INFO    - 5) cpp.libcxx.glibcxx.picolibc on intel_adsp/ace15_mtpm error (Build failure - error: bits/c++config.h: No such file or directory)
2025-07-22T12:27:55.7147144Z INFO    - 6) cpp.libcxx.glibcxx.picolibc on intel_adsp/cavs25 error (Build failure - error: bits/c++config.h: No such file or directory)

2025-07-22T11:32:32.0268762Z INFO    -  82/261 intel_adsp/cavs25         cpp.libcxx.glibcxx.picolibc                        �[31mERROR�[39m Build failure (build <zephyr/gnu>)
...
025-07-22T11:32:32.3706139Z -- Found GnuLd: C:/a/sdk-ng/sdk-ng/tools/zephyr-sdk-0.18.0-alpha4-23-g42bacb6/gnu/xtensa-intel_tgl_adsp_zephyr-elf/xtensa-intel_tgl_adsp_zephyr-elf/bin/ld.bfd.exe (found version "2.43.1")
2025-07-22T11:32:32.3707500Z -- The C compiler identification is GNU 14.3.0
2025-07-22T11:32:32.3708066Z -- The CXX compiler identification is GNU 14.3.0
2025-07-22T11:32:32.3708604Z -- The ASM compiler identification is GNU
2025-07-22T11:32:32.3709488Z -- Found assembler: S:/gnu/xtensa-intel_tgl_adsp_zephyr-elf/bin/xtensa-intel_tgl_adsp_zephyr-elf-gcc.exe
...
2025-07-22T11:32:32.3731686Z [14/160] Building CXX object CMakeFiles/app.dir/src/main.cpp.obj
2025-07-22T11:32:32.3732117Z 
2025-07-22T11:32:32.3732404Z FAILED: [code=1] CMakeFiles/app.dir/src/main.cpp.obj 
2025-07-22T11:32:32.3732807Z 
2025-07-22T11:32:32.3751930Z ccache S:\gnu\xtensa-intel_tgl_adsp_zephyr-elf\bin\xtensa-intel_tgl_adsp_zephyr-elf-g++.exe -DKERNEL -DK_HEAP_MEM_POOL_SIZE=0 -DPICOLIBC_LONG_LONG_PRINTF_SCANF -DTC_RUNID=cde2bf9719f72d1338d8b04cb0e20184 -D__LINUX_ERRNO_EXTENSIONS__ -D__ZEPHYR__=1 -IC:/a/sdk-ng/sdk-ng/test/twister-out/twister_links/test_167/zephyr/include/generated/zephyr -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/include -IC:/a/sdk-ng/sdk-ng/test/twister-out/twister_links/test_167/zephyr/include/generated -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/soc/intel/intel_adsp -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/soc/intel/intel_adsp/common -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/soc/intel/intel_adsp/common/include -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/soc/intel/intel_adsp/cavs -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/soc/intel/intel_adsp/cavs/include -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/soc/intel/intel_adsp/cavs/include/cavs25 -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/subsys/testsuite/include -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/subsys/testsuite/coverage -IC:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/subsys/testsuite/ztest/include -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/ti/mspm0/source/ti/devices/msp/. -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/ti/mspm0/source/ti/devices/msp/m0p -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/ti/mspm0/source/ti/devices/msp/peripherals -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/ti/mspm0/source/ti/devices/msp/peripherals/m0p -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/ti/mspm0/source/ti/devices/msp/peripherals/m0p/sysctl -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/xtensa/include -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/xtensa/XTENSA_HAL -IC:/a/sdk-ng/sdk-ng/zephyrproject/modules/hal/xtensa/zephyr/soc/intel_tgl_adsp -isystem C:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/lib/libc/common/include -fno-strict-aliasing -Werror -O2 -fcheck-new -std=c++17 -Wno-register -fno-rtti -imacros C:/a/sdk-ng/sdk-ng/test/twister-out/twister_links/test_167/zephyr/include/generated/zephyr/autoconf.h -fno-common -g -gdwarf-4 -fdiagnostics-color=always --sysroot=S://gnu/xtensa-intel_tgl_adsp_zephyr-elf/xtensa-intel_tgl_adsp_zephyr-elf -imacros C:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/include/zephyr/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wdouble-promotion -Wpointer-arith -Wexpansion-to-defined -Wno-unused-but-set-variable -fno-pic -fno-pie -fno-asynchronous-unwind-tables -fno-reorder-functions --param=min-pagesize=0 -fno-defer-pop -fmacro-prefix-map=C:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/tests/lib/cpp/libcxx=CMAKE_SOURCE_DIR -fmacro-prefix-map=C:/a/sdk-ng/sdk-ng/zephyrproject/zephyr=ZEPHYR_BASE -fmacro-prefix-map=C:/a/sdk-ng/sdk-ng/zephyrproject=WEST_TOPDIR -ffunction-sections -fdata-sections -mlongcalls -specs=picolibc.specs -MD -MT CMakeFiles/app.dir/src/main.cpp.obj -MF CMakeFiles\app.dir\src\main.cpp.obj.d -o CMakeFiles/app.dir/src/main.cpp.obj -c C:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/tests/lib/cpp/libcxx/src/main.cpp
2025-07-22T11:32:32.3771425Z 
2025-07-22T11:32:32.3772486Z In file included from C:/a/sdk-ng/sdk-ng/tools/zephyr-sdk-0.18.0-alpha4-23-g42bacb6/gnu/xtensa-intel_tgl_adsp_zephyr-elf/xtensa-intel_tgl_adsp_zephyr-elf/include/c++/14.3.0/compare:36,
2025-07-22T11:32:32.3774630Z                  from C:/a/sdk-ng/sdk-ng/tools/zephyr-sdk-0.18.0-alpha4-23-g42bacb6/gnu/xtensa-intel_tgl_adsp_zephyr-elf/xtensa-intel_tgl_adsp_zephyr-elf/include/c++/14.3.0/array:38,
2025-07-22T11:32:32.3776251Z                  from C:/a/sdk-ng/sdk-ng/zephyrproject/zephyr/tests/lib/cpp/libcxx/src/main.cpp:7:
2025-07-22T11:32:32.3778118Z C:/a/sdk-ng/sdk-ng/tools/zephyr-sdk-0.18.0-alpha4-23-g42bacb6/gnu/xtensa-intel_tgl_adsp_zephyr-elf/xtensa-intel_tgl_adsp_zephyr-elf/include/c++/14.3.0/bits/version.h:49:10: fatal error: bits/c++config.h: No such file or directory
2025-07-22T11:32:32.3779739Z    49 | #include <bits/c++config.h>
2025-07-22T11:32:32.3780220Z       |          ^~~~~~~~~~~~~~~~~~
2025-07-22T11:32:32.3780670Z compilation terminated.

Full log: https://github.com/zephyrproject-rtos/sdk-ng/actions/runs/16438257464/job/46465635676

This is a long path issue. The issue is locally reproducible on a Windows 10 22H2 machine; moving the toolchain directory to a shorter path makes the compilation succeed.

Based on https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry, enabling system-wide long path support (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem\LongPathsEnabled=1) and patching the GCC executable manifest makes it work with longer paths.