[PATCH] build: support building static library

[Chen Linxuan]

Hi,

On 2024/6/6 10:22, Gao Xiang wrote:
> Hi,
> 
> On 2024/6/6 10:13, Chen Linxuan wrote:
>> Hi Xiang!
>>
>> On 2024/5/23 16:05, Gao Xiang wrote:
>>> Hi Comix!
>>>
>>> On 2024/5/23 15:31, ComixHe wrote:
>>>> In some cases, developer may need to integrate erofs-utils into their
>>>> proejct as a static library to reduce package dependencies and
>>>> have more finer control over the feature used by the project.
>>>
>>> Thanks for sharing this.
>>>
>>>>
>>>> For exapmle, squashfuse provides a static library `libsquashfuse.a` and
>>
>> We want a static library for running fuse-erofs, maybe liberofsfuse or 
>> something like that, to make a appimage like bundle with erofs.
>>
>> For quite a long time, Appimage guys patch the fuse program of 
>> squashfs to get such a static library, and this patch is accepted by 
>> Debian.
>>
>> https://github.com/AppImageCommunity/libappimage/blob/master/src/patches/squashfuse.patch
>>
>> https://salsa.debian.org/sgmoore/squashfuse/-/commit/489b04eb7f5e45478f2ba5cd8d7173bb96
>>
>> The patch just make a binary to be a static library by changing `main` 
>> to `fusefs_main`.
>>
> 
> Since squashfs don't have any offical libsquashfs, so I guess they tried
> export the squashfuse project as a library.
> 
> But erofs-utils is quite another story since we already have an offical
> `liberofs` concept.   If you'd like to export some FUSE interface, would
> you mind moving some logic in fuse/ to lib/?  Does this way also work
> for you?

Sure.

We will send other patches later.

Thanks,
Chen Linxuan

> 
> Thanks,
> Gao Xiang
> 
> 
>> We just want to do the same thing appimage guys do to squashfs.
>>
>>>> exposes some useful functions, Appimage uses this static library to 
>>>> build
>>>> image. It could ensure that the executable image can be executed 
>>>> directly
>>>> on most linux platforms and the user doesn't need to install squashfuse
>>>> in order to execute the image.
>>>>
>>>> Signed-off-by: ComixHe <heyuming at deepin.org>
>>>> ---
>>>>   configure.ac     | 28 ++++++++++++++++++++++++++++
>>>>   dump/Makefile.am | 10 ++++++++++
>>>>   fsck/Makefile.am | 10 ++++++++++
>>>>   fuse/Makefile.am | 10 ++++++++++
>>>>   mkfs/Makefile.am | 10 ++++++++++
>>>>   5 files changed, 68 insertions(+)
>>>>
>>>> diff --git a/configure.ac b/configure.ac
>>>> index 1989bca..16ddb7c 100644
>>>> --- a/configure.ac
>>>> +++ b/configure.ac
>>>> @@ -147,6 +147,30 @@ AC_ARG_ENABLE(fuse,
>>>>      [AS_HELP_STRING([--enable-fuse], [enable erofsfuse 
>>>> @<:@default=no@:>@])],
>>>>      [enable_fuse="$enableval"], [enable_fuse="no"])
>>>> +AC_ARG_ENABLE([static-fuse],
>>>> +    [AS_HELP_STRING([--enable-static-fuse],
>>>> +                    [build erofsfuse as a static library 
>>>> @<:@default=no@:>@])],
>>>> +    [enable_static_fuse="$enableval"],
>>>> +    [enable_static_fuse="no"])
>>>> +
>>>> +AC_ARG_ENABLE([static-dump],
>>>> +    [AS_HELP_STRING([--enable-static-dump],
>>>> +                    [build dump.erofs as a static library 
>>>> @<:@default=no@:>@])],
>>>> +    [enable_static_dump="$enableval"],
>>>> +    [enable_static_dump="no"])
>>>> +
>>>> +AC_ARG_ENABLE([static-mkfs],
>>>> +    [AS_HELP_STRING([--enable-static-mkfs],
>>>> +                    [build mkfs.erofs as a static library 
>>>> @<:@default=no@:>@])],
>>>> +    [enable_static_mkfs="$enableval"],
>>>> +    [enable_static_mkfs="no"])
>>>> +
>>>> +AC_ARG_ENABLE([static-fsck],
>>>> +    [AS_HELP_STRING([--enable-static-fsck],
>>>> +                    [build fsck.erofs as a static library 
>>>> @<:@default=no@:>@])],
>>>> +    [enable_static_fsck="$enableval"],
>>>> +    [enable_static_fsck="no"])
>>>
>>> But how could we support static libraries from binaries?
>>>
>>> I guess you need static liberofs instead?
>>>
>>> Thanks,
>>> Gao Xiang
>>>
>