Date: Mon, 18 Apr 2022 20:41:39 +0000
For those two options, you can also pointer them to
/interface<https://docs.microsoft.com/en-us/cpp/build/reference/interface?view=msvc-170>
/internalPartition<https://docs.microsoft.com/en-us/cpp/build/reference/internal-partition?view=msvc-170>
which are the official documentation pages. There is no “need suffix”. Sorry those two pages were missing earlier.
-- Gaby
From: Ext <ext-bounces_at_[hidden]> On Behalf Of Nicolai Josuttis via Ext
Sent: Sunday, April 17, 2022 2:24 AM
To: Gabriel Dos Reis <gdr_at_[hidden]>; ext_at_[hidden]
Cc: Nicolai Josuttis <nico_at_[hidden]>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
Awesome, thanks.
Here is what I document now:
- **Interface files** (module interface or interface partition)
need suffix `.ixx` or the option `/interface`
- **Internal partitions** need the option `/internalPartition`
(the suffix doesn't matter; they recommend the usual suffix such as .cpp).
- **Module implementation units** need no specific module treatment
(use the usual suffix with no special option such as .cpp)
- Options `/interface` and `/internalPartition` may not be used together
I also sent this to twitter because there were other answers given.
Thanks again
Nico
Am 17.04.2022 um 03:25 schrieb Gabriel Dos Reis:
[Nico]
1. still I don't know the suffix for internal partitions
I answered this (multiple times) a few months back when you asked me to review part of the chapter of your book. For internal partitions, use whatever suffix (e.g. .C, .cxx, .cpp, .cc) you use for your normal C++ source file. MSVC does not recommend nor use a distinct suffix for internal partitions; they aren’t interface source files. The “.ixx” suffix is for module interface files (primary or partitions). The suffix isn’t to make the compiler’s job easier; it is to support other tools that don’t read the content of C++ source files in order to determine whether it defines an interface or something else.
-- Gaby
From: Ext <ext-bounces_at_[hidden]><mailto:ext-bounces_at_[hidden]> On Behalf Of Nico Josuttis via Ext
Sent: Saturday, April 16, 2022 3:54 AM
To: ext_at_[hidden]<mailto:ext_at_[hidden]>; Roger Orr via Ext <ext_at_[hidden]><mailto:ext_at_[hidden]>
Cc: Nico Josuttis <nico_at_[hidden]><mailto:nico_at_[hidden]>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
Hi Roger,
I agree.
However, cmake and other tools use the command line. So, they would have these problems solved.
Even for Visual Studio, if there is support for arbitrary file extensions and no need for specific command line options, code coming from different compiler can just be used as it is.
So, programmers could have all files with suffix .cpp (as is fine for gcc) and just add them to the Visual Studio project without further action.
While of course VC++ still can reommend special suffixes like .ixx (still I don't know the suffix for internal partitions), the other compilers would not have to adopt their convention and the community will decide which suffix "wins" (as it happened with ".cpp" which came from a Microsoft, although strangly it is not used by them in a modified form for modules).
I will today publish a script that fix the problems Visual Studio has with module files for the command line. That way, programmers can write their first portable module programm... (portable in the practical not formal sense, Gaby).
As usual, correct me if I miss something.
Am 16. April 2022 12:10:03 MESZ schrieb Roger Orr via Ext <ext_at_[hidden]<mailto:ext_at_[hidden]>>:
Hello Nico,
I am slightly puzzled by the use of 'command line' and 'command' in your email.
In my own experience I suspect few of the C++ programmers I work with ever compile with a command line; they either work within an IDE or run a build script, likely using cmake. It us unclear to me what is the benefit of seeking a unified command line that most programmers are not even aware of.
Regards,
Roger.
-----Original Message-----
From: Ext [mailto:ext-bounces_at_[hidden]p.org] On Behalf Of Nico Josuttis via Ext
Sent: 16 April 2022 07:43
To: Gabriel Dos Reis; ext_at_[hidden]rg<mailto:ext_at_[hidden]>; sg15_at_[hidden]<mailto:sg15_at_[hidden]>
Cc: Nico Josuttis; Nathan Sidwell
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
Gaby,
you want me to tell programmers that we have portable examples, for which unfortunately there is not defined HOW to deal with them?
And selling this as "you can use modules in practice"? 🤔
Of course for programmers a portable program implies that
a) I don't have to rename files
b) I don't have to use different conmand-line options for files having the same suffix
c) I can compile all code with a single command
Once we have that, we can teach content and programmers will use it. So far, the clear conclusion is that you cannot use modules in practice.
It would be absolutely no problem to provide that for Visual C++. Ideally ignoring file extensions and analyze C++ file content.
Therefore, I wonder why you do not WANT that (and at the same time tell that you are interesting that modules become widely used).
And, BTW, I am desperately looking for the file extension Visual C++ expect for internal patition units
(to skip /internalPartition).
PLEASE just tell us.
Thanks
Am 15. April 2022 21:46:13 MESZ schrieb Gabriel Dos Reis <gdr_at_[hidden]<mailto:gdr_at_[hidden]>>:
Fortunately, there IS a portable C++ example of “hello world” program,
today.
*How* to compile a given source file has always depended on compilers,
their environment of invocations, and supporting toolsets. That won’t
change. And Modules don’t have a goal of changing that.
Requiring that the set of satellite files that a compiler has to produce depends solely on the contents of the source file, and not on the invocation command lines, isn’t going to work in real world, production environments. That is what build systems are for, to abstract over the details. My hope is that professional teaching of programming with modules direct C++ programmers to relying on their build systems.
We are having a conversation in SG15 about common ways of describing to
build systems what are the needs of a program and library, and let the
build system make the build happens. And that is not restricted to
modules, even though they make the conversation urgent.
-- Gaby
From: Nico Josuttis <nico_at_[hidden]<mailto:nico_at_[hidden]>>
Sent: Friday, April 15, 2022 12:05 PM
To: ext_at_[hidden]cpp.org<mailto:ext_at_[hidden]>; Gabriel Dos Reis via Ext
<ext_at_[hidden]<mailto:ext_at_[hidden]g>>; ext_at_[hidden]<mailto:ext_at_[hidden]>; sg15_at_[hidden]<mailto:sg15_at_[hidden]>
Cc: Gabriel Dos Reis <gdr_at_[hidden]<mailto:gdr_at_[hidden]>>; Nathan Sidwell <nathan_at_[hidden]<mailto:nathan_at_[hidden]>>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
haha,
I REALLY would like to have the first portable "hello module" example.
Currently, there is simply no way to have it. That's really a shame.
Am 15. April 2022 20:46:59 MESZ schrieb Gabriel Dos Reis via Ext
<ext_at_[hidden]<mailto:ext_at_[hidden]<mailto:ext_at_[hidden]%3cmailto:ext_at_[hidden]>>>:
Nathan - you recount is all correct.
I know I've mentioned it more than once, but I find it unsettling,
given there was great opposition to there being a (two way?) mapping
between file names and module names, that there is a move in the
direction of making file names 'significant'. ISTM that the desire for
bob.$REGULARSUFFIX and alice.$MODULESUFFIX is taking us all the way
back to the first objection above about having two languages.
I am not seeing any movement to make filename suffixes significant in
the linguistic interpretation, by the compiler, of the content of
source file. Maybe I am not looking right; but I would definitely
recommend against such move. There are extra linguistic considerations
that might force a toolset (not just a compiler) to require certain
suffixes, but those suffixes do not determine the meaning a C++ program
-- this is not different from compilers like GCC or MSVC refusing to
compile in default mode files ending with ".h" or similar because they
generally have other connotations.
For some reasons, the topic of the "right" suffix seems to generate
more passion than the topic of what can we do with modules, so maybe we
are already doing a lot with modules 😝
-- Gaby
-----Original Message-----
From: Ext
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Sent: Friday, April 15, 2022 11:21 AM
To: sg15_at_[hidden]ocpp.org<mailto:sg15_at_[hidden]<mailto:sg15_at_[hidden]%3cmailto:sg15_at_[hidden]>>; ext_at_[hidden]<mailto:ext_at_[hidden]<mailto:ext_at_[hidden]%3cmailto:ext_at_[hidden]>>; WG21 Tooling Study Group SG15 <tooling_at_[hidden]<mailto:tooling_at_[hidden]<mailto:tooling_at_[hidden]%3cmailto:tooling_at_[hidden]>>>
Cc: Nathan Sidwell <nathan_at_[hidden]<mailto:nathan_at_[hidden]<mailto:nathan_at_[hidden]%3cmailto:nathan_at_[hidden]>>>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
On 4/13/22 17:10, Nico Josuttis via SG15 wrote:
I should add that the fact that we need
module;
at the beginning of the global module fragment was only introduced to
let a file identify itself as module file. If we would require
different suffixes, that would not have been necessary.
But correct me if I am wrong.
I shall correct you :)
Here's the history (as I recall, all persons mentioned are real, and
not to be confused with ficticious characters)
* prior to me doing things with gcc, there was only 'module FOO;' as a
module declaration at-most once within a TU. MSVC (the only compiler
with module smarts at the time), had a flag to tell it 'this is an
interface' vs 'this is an implementation'.
* I found this unsatisfying, as it meant that there was something
outside the source tokens that told you how to interpret them. In
effect we had two languages.
* IIRC, Gaby, Jason (Merrill) and I came up with the 'export module
FOO;' vs 'module foo;' distinction. But still this could be anywhere
in the source stream. I was able to implement this functionality to a
working system.
* Daveed proposed an early signifier of 'hey, this is gonna be a
module', should the actual module declaration not be first. Hence
'module;' was born. (My understanding was that this was driven by
implementors, as they had difficulty entering a module-like mode not at
start of compilation, and indeed it was a little tricky to do that. I
do not know if this was also a user request.)
* post p1103, the requirement that everything between 'module;' and the
module decl come from #include came to be.
Hope that helps.
I know I've mentioned it more than once, but I find it unsettling,
given there was great opposition to there being a (two way?) mapping
between file names and module names, that there is a move in the
direction of making file names 'significant'. ISTM that the desire for
bob.$REGULARSUFFIX and alice.$MODULESUFFIX is taking us all the way
back to the first objection above about having two languages.
nathan
Am 13. April 2022 22:58:13 MESZ schrieb Nicolai Josuttis via Ext
<ext_at_[hidden]<mailto:ext_at_[hidden]<mailto:ext_at_[hidden]%3cmailto:ext_at_[hidden]>>>:
What I teach about modules is compelling. Programmers like and want to use it.
However, they ask how they should organize module files in
practice.
So far I cannot recommend a specific suffix (and I might never be able to do
that).
However there is one important question that IMO the standard should answer:
*Do we **/need /**different suffixes?*
I understand that a suffix discussion is only of practical value.
But IMO the standard has to give an answer here (which has nothing to do
with which suffixes are used).
Let me elaborate that in detail:
Not having a standard suffix has interesting consequences.
So far we have header files and translation units.
But once we know what a C++ translation unit is, we can just compile them
all with the same compiler options or commands. Because in practice we have
different suffixes for header and source files, we can set-up generic rules
to compile our code.
This works for any suffix, provided you know the way to tell the compiler
that we have a C++ file here:
(use /Tp with VC++ and -xc++ with gcc and you are done).
Is this still true with modules?
That is: Can we expect that identifying a file as C++ file is enough to be
able to (pre) compile it as C++ file?
Current compilers give different answers (AFAIK):
- *gcc *says the same suffix is possible. There is not special option for
modules.
I can still have my own suffixes and use -xc++ though.
- *VC++* currently requires different suffixes or different command-line
arguments.
Identifying a file as C++ file is not enough.
For example
- This is not enough: /Tp mymod.cppm
- You need: /interface /Tp mymod.cppm
I wonder whether the behavior of VC++ is standard conforming.
I see no place in the C++ standard saying that there has to be different
treatment of C++ source files to make them work.
Or do we require this somewhere?
We do not require different treatment just because we have templates,
namespaces, or exceptions used inside.
Therefore, I would expect that also using modules does not require special
handling.
(This is independent from the question whether different suffixes help to
deal with these files).
If I am right, VC++ is not standard conforming.
In any case it would help a lot to clarify:
Can all C++ source files expect that treating them the same way
works fine?
If not, we obviously need different suffixes. But then we should clearly say
so (without necessarily saying which suffix it is).
I hope this questions brings us a bit forward to be able teach the first
*portable *"hello, modules" example.
Thanks
Nico
--
________________________________
Nicolai M. Josuttis
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(sent from my mobile phone)
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Nico Josuttis
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Nico Josuttis
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Nico Josuttis
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Nicolai M. Josuttis
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Books:
C++: http://cppstd20.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppstd20.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451084019%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Eqg185snWzded0AI%2BE5unK9XkprmgyDs7UwRVT0RIQw%3D&reserved=0>, http://cppstd17.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppstd17.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451093975%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=X4mAV0NutCd7r3iFECxQS1hLSDZzYt%2BvPqec7E2WiHk%3D&reserved=0>, http://cppmove.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppmove.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451093975%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=SzrcROHy4OfW0EAqfeSzQelj%2FJzigYMjAVMeK5R4en0%3D&reserved=0>,
http://cppstdlib.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppstdlib.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451093975%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2F8AEN2Kd7LTEePvKgUOztqv3fXWrBB5Jn6x88qX3yEI%3D&reserved=0>, http://tmplbook.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftmplbook.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451103931%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=15jUsFiELxKTFyvuIDGGoAEyvobniPHdlnxVi9avqCM%3D&reserved=0>
/interface<https://docs.microsoft.com/en-us/cpp/build/reference/interface?view=msvc-170>
/internalPartition<https://docs.microsoft.com/en-us/cpp/build/reference/internal-partition?view=msvc-170>
which are the official documentation pages. There is no “need suffix”. Sorry those two pages were missing earlier.
-- Gaby
From: Ext <ext-bounces_at_[hidden]> On Behalf Of Nicolai Josuttis via Ext
Sent: Sunday, April 17, 2022 2:24 AM
To: Gabriel Dos Reis <gdr_at_[hidden]>; ext_at_[hidden]
Cc: Nicolai Josuttis <nico_at_[hidden]>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
Awesome, thanks.
Here is what I document now:
- **Interface files** (module interface or interface partition)
need suffix `.ixx` or the option `/interface`
- **Internal partitions** need the option `/internalPartition`
(the suffix doesn't matter; they recommend the usual suffix such as .cpp).
- **Module implementation units** need no specific module treatment
(use the usual suffix with no special option such as .cpp)
- Options `/interface` and `/internalPartition` may not be used together
I also sent this to twitter because there were other answers given.
Thanks again
Nico
Am 17.04.2022 um 03:25 schrieb Gabriel Dos Reis:
[Nico]
1. still I don't know the suffix for internal partitions
I answered this (multiple times) a few months back when you asked me to review part of the chapter of your book. For internal partitions, use whatever suffix (e.g. .C, .cxx, .cpp, .cc) you use for your normal C++ source file. MSVC does not recommend nor use a distinct suffix for internal partitions; they aren’t interface source files. The “.ixx” suffix is for module interface files (primary or partitions). The suffix isn’t to make the compiler’s job easier; it is to support other tools that don’t read the content of C++ source files in order to determine whether it defines an interface or something else.
-- Gaby
From: Ext <ext-bounces_at_[hidden]><mailto:ext-bounces_at_[hidden]> On Behalf Of Nico Josuttis via Ext
Sent: Saturday, April 16, 2022 3:54 AM
To: ext_at_[hidden]<mailto:ext_at_[hidden]>; Roger Orr via Ext <ext_at_[hidden]><mailto:ext_at_[hidden]>
Cc: Nico Josuttis <nico_at_[hidden]><mailto:nico_at_[hidden]>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
Hi Roger,
I agree.
However, cmake and other tools use the command line. So, they would have these problems solved.
Even for Visual Studio, if there is support for arbitrary file extensions and no need for specific command line options, code coming from different compiler can just be used as it is.
So, programmers could have all files with suffix .cpp (as is fine for gcc) and just add them to the Visual Studio project without further action.
While of course VC++ still can reommend special suffixes like .ixx (still I don't know the suffix for internal partitions), the other compilers would not have to adopt their convention and the community will decide which suffix "wins" (as it happened with ".cpp" which came from a Microsoft, although strangly it is not used by them in a modified form for modules).
I will today publish a script that fix the problems Visual Studio has with module files for the command line. That way, programmers can write their first portable module programm... (portable in the practical not formal sense, Gaby).
As usual, correct me if I miss something.
Am 16. April 2022 12:10:03 MESZ schrieb Roger Orr via Ext <ext_at_[hidden]<mailto:ext_at_[hidden]>>:
Hello Nico,
I am slightly puzzled by the use of 'command line' and 'command' in your email.
In my own experience I suspect few of the C++ programmers I work with ever compile with a command line; they either work within an IDE or run a build script, likely using cmake. It us unclear to me what is the benefit of seeking a unified command line that most programmers are not even aware of.
Regards,
Roger.
-----Original Message-----
From: Ext [mailto:ext-bounces_at_[hidden]p.org] On Behalf Of Nico Josuttis via Ext
Sent: 16 April 2022 07:43
To: Gabriel Dos Reis; ext_at_[hidden]rg<mailto:ext_at_[hidden]>; sg15_at_[hidden]<mailto:sg15_at_[hidden]>
Cc: Nico Josuttis; Nathan Sidwell
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
Gaby,
you want me to tell programmers that we have portable examples, for which unfortunately there is not defined HOW to deal with them?
And selling this as "you can use modules in practice"? 🤔
Of course for programmers a portable program implies that
a) I don't have to rename files
b) I don't have to use different conmand-line options for files having the same suffix
c) I can compile all code with a single command
Once we have that, we can teach content and programmers will use it. So far, the clear conclusion is that you cannot use modules in practice.
It would be absolutely no problem to provide that for Visual C++. Ideally ignoring file extensions and analyze C++ file content.
Therefore, I wonder why you do not WANT that (and at the same time tell that you are interesting that modules become widely used).
And, BTW, I am desperately looking for the file extension Visual C++ expect for internal patition units
(to skip /internalPartition).
PLEASE just tell us.
Thanks
Am 15. April 2022 21:46:13 MESZ schrieb Gabriel Dos Reis <gdr_at_[hidden]<mailto:gdr_at_[hidden]>>:
Fortunately, there IS a portable C++ example of “hello world” program,
today.
*How* to compile a given source file has always depended on compilers,
their environment of invocations, and supporting toolsets. That won’t
change. And Modules don’t have a goal of changing that.
Requiring that the set of satellite files that a compiler has to produce depends solely on the contents of the source file, and not on the invocation command lines, isn’t going to work in real world, production environments. That is what build systems are for, to abstract over the details. My hope is that professional teaching of programming with modules direct C++ programmers to relying on their build systems.
We are having a conversation in SG15 about common ways of describing to
build systems what are the needs of a program and library, and let the
build system make the build happens. And that is not restricted to
modules, even though they make the conversation urgent.
-- Gaby
From: Nico Josuttis <nico_at_[hidden]<mailto:nico_at_[hidden]>>
Sent: Friday, April 15, 2022 12:05 PM
To: ext_at_[hidden]cpp.org<mailto:ext_at_[hidden]>; Gabriel Dos Reis via Ext
<ext_at_[hidden]<mailto:ext_at_[hidden]g>>; ext_at_[hidden]<mailto:ext_at_[hidden]>; sg15_at_[hidden]<mailto:sg15_at_[hidden]>
Cc: Gabriel Dos Reis <gdr_at_[hidden]<mailto:gdr_at_[hidden]>>; Nathan Sidwell <nathan_at_[hidden]<mailto:nathan_at_[hidden]>>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
haha,
I REALLY would like to have the first portable "hello module" example.
Currently, there is simply no way to have it. That's really a shame.
Am 15. April 2022 20:46:59 MESZ schrieb Gabriel Dos Reis via Ext
<ext_at_[hidden]<mailto:ext_at_[hidden]<mailto:ext_at_[hidden]%3cmailto:ext_at_[hidden]>>>:
Nathan - you recount is all correct.
I know I've mentioned it more than once, but I find it unsettling,
given there was great opposition to there being a (two way?) mapping
between file names and module names, that there is a move in the
direction of making file names 'significant'. ISTM that the desire for
bob.$REGULARSUFFIX and alice.$MODULESUFFIX is taking us all the way
back to the first objection above about having two languages.
I am not seeing any movement to make filename suffixes significant in
the linguistic interpretation, by the compiler, of the content of
source file. Maybe I am not looking right; but I would definitely
recommend against such move. There are extra linguistic considerations
that might force a toolset (not just a compiler) to require certain
suffixes, but those suffixes do not determine the meaning a C++ program
-- this is not different from compilers like GCC or MSVC refusing to
compile in default mode files ending with ".h" or similar because they
generally have other connotations.
For some reasons, the topic of the "right" suffix seems to generate
more passion than the topic of what can we do with modules, so maybe we
are already doing a lot with modules 😝
-- Gaby
-----Original Message-----
From: Ext
<ext-bounces_at_[hidden]<mailto:ext-bounces_at_[hidden]<mailto:ext-bounces_at_[hidden]%3cmailto:ext-bounces_at_[hidden]>>> On Behalf Of Nathan Sidwell via Ext
Sent: Friday, April 15, 2022 11:21 AM
To: sg15_at_[hidden]ocpp.org<mailto:sg15_at_[hidden]<mailto:sg15_at_[hidden]%3cmailto:sg15_at_[hidden]>>; ext_at_[hidden]<mailto:ext_at_[hidden]<mailto:ext_at_[hidden]%3cmailto:ext_at_[hidden]>>; WG21 Tooling Study Group SG15 <tooling_at_[hidden]<mailto:tooling_at_[hidden]<mailto:tooling_at_[hidden]%3cmailto:tooling_at_[hidden]>>>
Cc: Nathan Sidwell <nathan_at_[hidden]<mailto:nathan_at_[hidden]<mailto:nathan_at_[hidden]%3cmailto:nathan_at_[hidden]>>>
Subject: Re: [isocpp-ext] [SG15] Can we expect that all C++ source files can have the same suffix?
On 4/13/22 17:10, Nico Josuttis via SG15 wrote:
I should add that the fact that we need
module;
at the beginning of the global module fragment was only introduced to
let a file identify itself as module file. If we would require
different suffixes, that would not have been necessary.
But correct me if I am wrong.
I shall correct you :)
Here's the history (as I recall, all persons mentioned are real, and
not to be confused with ficticious characters)
* prior to me doing things with gcc, there was only 'module FOO;' as a
module declaration at-most once within a TU. MSVC (the only compiler
with module smarts at the time), had a flag to tell it 'this is an
interface' vs 'this is an implementation'.
* I found this unsatisfying, as it meant that there was something
outside the source tokens that told you how to interpret them. In
effect we had two languages.
* IIRC, Gaby, Jason (Merrill) and I came up with the 'export module
FOO;' vs 'module foo;' distinction. But still this could be anywhere
in the source stream. I was able to implement this functionality to a
working system.
* Daveed proposed an early signifier of 'hey, this is gonna be a
module', should the actual module declaration not be first. Hence
'module;' was born. (My understanding was that this was driven by
implementors, as they had difficulty entering a module-like mode not at
start of compilation, and indeed it was a little tricky to do that. I
do not know if this was also a user request.)
* post p1103, the requirement that everything between 'module;' and the
module decl come from #include came to be.
Hope that helps.
I know I've mentioned it more than once, but I find it unsettling,
given there was great opposition to there being a (two way?) mapping
between file names and module names, that there is a move in the
direction of making file names 'significant'. ISTM that the desire for
bob.$REGULARSUFFIX and alice.$MODULESUFFIX is taking us all the way
back to the first objection above about having two languages.
nathan
Am 13. April 2022 22:58:13 MESZ schrieb Nicolai Josuttis via Ext
<ext_at_[hidden]<mailto:ext_at_[hidden]<mailto:ext_at_[hidden]%3cmailto:ext_at_[hidden]>>>:
What I teach about modules is compelling. Programmers like and want to use it.
However, they ask how they should organize module files in
practice.
So far I cannot recommend a specific suffix (and I might never be able to do
that).
However there is one important question that IMO the standard should answer:
*Do we **/need /**different suffixes?*
I understand that a suffix discussion is only of practical value.
But IMO the standard has to give an answer here (which has nothing to do
with which suffixes are used).
Let me elaborate that in detail:
Not having a standard suffix has interesting consequences.
So far we have header files and translation units.
But once we know what a C++ translation unit is, we can just compile them
all with the same compiler options or commands. Because in practice we have
different suffixes for header and source files, we can set-up generic rules
to compile our code.
This works for any suffix, provided you know the way to tell the compiler
that we have a C++ file here:
(use /Tp with VC++ and -xc++ with gcc and you are done).
Is this still true with modules?
That is: Can we expect that identifying a file as C++ file is enough to be
able to (pre) compile it as C++ file?
Current compilers give different answers (AFAIK):
- *gcc *says the same suffix is possible. There is not special option for
modules.
I can still have my own suffixes and use -xc++ though.
- *VC++* currently requires different suffixes or different command-line
arguments.
Identifying a file as C++ file is not enough.
For example
- This is not enough: /Tp mymod.cppm
- You need: /interface /Tp mymod.cppm
I wonder whether the behavior of VC++ is standard conforming.
I see no place in the C++ standard saying that there has to be different
treatment of C++ source files to make them work.
Or do we require this somewhere?
We do not require different treatment just because we have templates,
namespaces, or exceptions used inside.
Therefore, I would expect that also using modules does not require special
handling.
(This is independent from the question whether different suffixes help to
deal with these files).
If I am right, VC++ is not standard conforming.
In any case it would help a lot to clarify:
Can all C++ source files expect that treating them the same way
works fine?
If not, we obviously need different suffixes. But then we should clearly say
so (without necessarily saying which suffix it is).
I hope this questions brings us a bit forward to be able teach the first
*portable *"hello, modules" example.
Thanks
Nico
--
________________________________
Nicolai M. Josuttis
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(sent from my mobile phone)
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Nico Josuttis
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Nico Josuttis
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Nicolai M. Josuttis
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C++: http://cppstd20.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppstd20.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451084019%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Eqg185snWzded0AI%2BE5unK9XkprmgyDs7UwRVT0RIQw%3D&reserved=0>, http://cppstd17.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppstd17.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451093975%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=X4mAV0NutCd7r3iFECxQS1hLSDZzYt%2BvPqec7E2WiHk%3D&reserved=0>, http://cppmove.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppmove.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451093975%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=SzrcROHy4OfW0EAqfeSzQelj%2FJzigYMjAVMeK5R4en0%3D&reserved=0>,
http://cppstdlib.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcppstdlib.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451093975%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2F8AEN2Kd7LTEePvKgUOztqv3fXWrBB5Jn6x88qX3yEI%3D&reserved=0>, http://tmplbook.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftmplbook.com%2F&data=05%7C01%7Cgdr%40microsoft.com%7C47a42970c1cd4f8d1ac808da205402cf%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637857842451103931%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=15jUsFiELxKTFyvuIDGGoAEyvobniPHdlnxVi9avqCM%3D&reserved=0>
Received on 2022-04-18 20:41:48