File content as of revision 3:1198227e6421:

{
    "GCC_ARM": {
        "common": ["-c", "-Wall", "-Wextra",
                   "-Wno-unused-parameter", "-Wno-missing-field-initializers",
                   "-fmessage-length=0", "-fno-exceptions", "-fno-builtin",
                   "-ffunction-sections", "-fdata-sections", "-funsigned-char",
                   "-MMD", "-fno-delete-null-pointer-checks",
                   "-fomit-frame-pointer", "-O0", "-g"],
        "asm": ["-x", "assembler-with-cpp"],
        "c": ["-std=gnu99"],
        "cxx": ["-std=gnu++98", "-fno-rtti", "-Wvla"],
        "ld": ["-Wl,--gc-sections", "-Wl,--wrap,main", "-Wl,--wrap,_malloc_r",
               "-Wl,--wrap,_free_r", "-Wl,--wrap,_realloc_r",
               "-Wl,--wrap,_calloc_r", "-Wl,--wrap,exit", "-Wl,--wrap,atexit"]
    },
    "ARM": {
        "common": ["-c", "--gnu", "-Otime", "--split_sections",
                   "--apcs=interwork", "--brief_diagnostics", "--restrict",
                   "--multibyte_chars", "-O0", "-g"],
        "asm": [],
        "c": ["--md", "--no_depend_system_headers", "--c99", "-D__ASSERT_MSG"],
        "cxx": ["--cpp", "--no_rtti", "--no_vla"],
        "ld": []
    },
    "uARM": {
        "common": ["-c", "--gnu", "-Otime", "--split_sections",
                   "--apcs=interwork", "--brief_diagnostics", "--restrict",
                   "--multibyte_chars", "-O0", "-D__MICROLIB", "-g",
                   "--library_type=microlib", "-DMBED_RTOS_SINGLE_THREAD"],
        "asm": [],
        "c": ["--md", "--no_depend_system_headers", "--c99", "-D__ASSERT_MSG"],
        "cxx": ["--cpp", "--no_rtti", "--no_vla"],
        "ld": ["--library_type=microlib"]
    },
    "IAR": {
        "common": [
            "--no_wrap_diagnostics",  "-e",
            "--diag_suppress=Pa050,Pa084,Pa093,Pa082", "-On", "-r"],
        "asm": [],
        "c": ["--vla"],
        "cxx": ["--guard_calls", "--no_static_destruction"],
        "ld": ["--skip_dynamic_initialization", "--threaded_lib"]
    }
}