The attached C++ file has these lines ...

struct tag_name
{
    int field;
    int array[100];
};

__attribute__((section("section_name")))
struct tag_name instance;

The customer expects section_name to be uninitialized. Build it and inspect the resulting assembly code ...

% tiarmclang -S cppfile.cpp

% findstr section_name cppfile.s
        .section        section_name,"aw",%progbits

Because of %progbits, and not %nobits, section_name is initialized.

Because it is initialized, when the executable file is converted to TI-TXT format, a large number of 0's is emitted for the memory where this section is allocated.