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Subject: Re: [SG15] module source suffixes
From: Gabriel Dos Reis (gdr_at_[hidden])
Date: 2019-08-27 23:45:29

It is still not clear to me that a module interface partition needs special suffix from a primary module interface unit.
Same for implementation partition unit.

-- Gaby

| -----Original Message-----
| From: SG15 <sg15-bounces_at_[hidden]> On Behalf Of Nathan Sidwell
| via SG15
| Sent: Monday, August 26, 2019 7:19 AM
| To: sg15_at_[hidden]
| Cc: Nathan Sidwell <nathan_at_[hidden]>
| Subject: [SG15] module source suffixes
| The proposals I've seen for a suffix to denote modular interface files
| take the form of changing the traditional c++ suffixes to something else.
| 1) There's the discussion of whether the 'c' is replaced by an 'm', but
| that leads to confusion if your suffix is '.cc' (hence the clang
| approach of appending an 'm'.
| 2) It requires teaching all your tools (and users) that the new suffix
| means C++.
| 3) With a paired header file/source file source base of the form
| foo/foo.cc or foo.h/foo.cc, converting the header to an interface will
| require either renaming the stem of one of them, or teaching the build
| system that naming the object file from the stem is not right.
| These all seem somewhat awkward.
| There's also the issue of module partitions. IIUC the new suffix is to
| denote interfaceness. But module partitions also fall into the same
| boat as primary module interfaces in that regard -- they generate CMIs.
| Naming module partitions with the same suffix as primary interfaces
| seems confusing. What's been discussed about that?
| Has there been discussion of naming the module interface by prepending a
| new suffix: foo.m.cc (or foo-m.cc) This avoids the above 3 issues.
| multisuffix files do exist (foo.tar.gz), but perhaps the '-m' form may
| be more palatable?
| Further, one could use 'mp' to denote a module partition:
| foo-m.cc -- primary interface
| foo-mp.cc -- partition
| foo.cc -- implementation
| nathan
| --
| Nathan Sidwell
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