Object file has too many sections

Question

We am making heavy use of boost::serialization and templates in general. All seems to be going well.

Except, we\'ve hit a snag on our Windows builds. It seems to cau

Answer 1

The error "%B: too many sections (%d)" comes from the function coff_compute_section_file_positions() located in bfd/coffcode.h. It's produced when the output .obj file (in COFF format) contains more than 32766 sections. There is no way to avoid this error, at least not if you want to use Windows' PE/COFF object format; COFF files use only two bytes for "NumberOfSections" in the file header.

It's not clear to me why as (the GNU assembler) caps the number of sections at 32768-minus-2, instead of 65536-minus-1 (section 0 is reserved); but either way, that might not be enough if you're making heavy use of templates and your compiler implements templates via COMDAT sections.

As you've already noticed, passing /bigobj to Microsoft's compiler causes it to output a munged COFF format with up to 2³¹ sections, which "should be enough for anybody." However, the munged format is formally undocumented, and I don't see any informal documentation (blog posts or what-have-you) on the subject, so until someone with a copy of MSVC can write up a specification for /bigobj, it doesn't stand much chance of getting into the GNU tools.

IMHO, if you're trying to make a Windows build, you should just bite the bullet and use MSVC. Nobody besides Microsoft is particularly motivated to waste time wrestling with the PE/COFF format.