Cannot find spec file "nano.specs" on Windows

[Sayter99]

when building cc_library target with --specs=nano.specs copts, I got the following error, although I can see the spec file under lib folder.

gcc: fatal error: cannot read spec file 'nano.specs': No such file or directory
compilation terminated.

It seems that this issue only occurs on Windows, below is my environment

os: windows11
bazel: 7.2.0
toolchain: arm_none_eabi_windows_x86_64

It was working with ea916f4724eb47de8f1c22f7fed99faa05208a1e

[hexdae]

Interesting, I wonder if the newer versions of GCC are more strict on windows, can you try using an older version (say 13.2.1) and check if the problem persists?

This commit changed the default behavior to use the latest available GCC version and it may have impacted your problem

https://github.com/hexdae/toolchains_arm_gnu/commit/7080adcae04e6398f090a3f841278325dd3ecad8

[hexdae]

Hmm, I added --specs=nano.specs to the arm-none-eabi test in this PR https://github.com/hexdae/toolchains_arm_gnu/pull/56 and it passes in CI for windows

Can you show me your BUILD file?

[Sayter99]

The culprit is this genrule I used to generate a startup object file.

genrule(
    name = "core_startup",
    srcs = ["Core/Startup/startup_stm32f429vitx.s"],
    outs = ["startup_stm32f429vitx.o"],
    cmd = "$(execpath @arm_none_eabi//:gcc) -DHAL_BOARD=3 -c -x assembler-with-cpp --specs=nano.specs -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb -o $@ $<",
    tools = ["@arm_none_eabi//:gcc"],
)

cc_binary(
    name = "core_elf",
    srcs = [
        "Core/Src/main.c",
        ":core_startup",
    ],
    additional_linker_inputs = [
        "STM32F429VITX_FLASH.ld",
    ],
    copts = common_copts(),
    linkopts = [
        "-Tja3_io/STM32F429VITX_FLASH.ld",
        "-Wl,--gc-sections",
        "-Wl,--start-group -lc -lm -lstdc++ -lsupc++ -Wl,--end-group",
    ] + common_linkopts(),
    target_compatible_with = [
        "@platforms//cpu:arm",
        "@platforms//os:none",
    ],
    visibility = ["//ja3_io:__subpackages__"],
    deps = [
        ":core_lib",
        ":ethernet_hub",
        ":inf_hal",
        ":lwip",
        ":middleware_freertos",
        ":middleware_lwip",
        ":middleware_usb_device",
        ":stm32f4xx_hal_driver",
        ":usb_device",
    ],
)

I am realizing that

1. I shouldn't put --specs=nano.specs here, instead, it should be a linkopt to the binary
2. with some changes lately, @arm_none_eabi//:gcc tool in genrule cannot access specs files (in the past, it was working), but I think it is fine, as I now refactor the above genrule by cc_library

   
   cc_library(
   name = "startup",
   srcs = ["Core/Startup/startup_stm32f429vitx.s"],
   linkopts = ["-Tja3_io/STM32F429VITX_FLASH.ld"],
   target_compatible_with = ["@platforms//os:none"],
   deps = ["STM32F429VITX_FLASH.ld"],
   alwayslink = True,
   )

cc_binary( name = "core_elf", srcs = [ "Core/Src/main.c", ], copts = common_copts(), features = ["generate_linkmap"], linkopts = [ "-Wl,--gc-sections", "-Wl,--start-group -lc -lm -lstdc++ -lsupc++ -Wl,--end-group", "--specs=nano.specs", "--specs=nosys.specs", ] + common_linkopts(), target_compatible_with = [ "@platforms//cpu:arm", "@platforms//os:none", ], visibility = ["//ja3_io:subpackages"], deps = [ ":core_lib", ":ethernet_hub", ":inf_hal", ":lwip", ":middleware_freertos", ":middleware_lwip", ":middleware_usb_device", ":startup", ":stm32f4xx_hal_driver", ":usb_device", ], )

Closing this issue as I can build my target again.