[swift-users] make swift compiler to use the precompiled module files

[Ramakrishna Mallireddy]

I found the the reason behind the odd behaviour, It's actually normal in my
case as my
*hsOpts*.*ResourceDir* path keeps on changing on every run during Debug
build/run process under Xcode.

*hsOpts*.*ResourceDir *path refers to a bundle inside my app. This is the
reason why I observe normal as odd behaviour.

It behaves normally, if I run the app directly on the simulator/device
irrespective of build configuration[*Debug*/*Release*].

Thanks Daniel for point to the commandline swiftc. I was able to find this
only by running swiftc with lldb & my app in Xcode simultaneously, and
keeping a Breakpoint at *Clang*::*CompilerInvocation*::*getModuleHash*()
method.

cheers
RK

On Sat, Apr 30, 2016 at 3:02 PM, Ramakrishna Mallireddy <
ramakrishna.malli at gmail.com> wrote:

> No, it doesn't happen. The same flags works fine with swiftc when using
> from command line.
>
> swiftc xcode project generated from Ninja have the same issue as I have
> i.e hash value is different for each run.
>
> LLVMTest.app is my application that is linked with swift-clang, swift-llvm
> & swift-2.2.release libraries.
>
> Following are the commandline arguments that I am using.
>
> const char *argv[] = {sourceFilePath, "-target", "arm64-apple-ios8.0",
> "-module-cache-path", [moduleCache cStringUsingEncoding:
> NSUTF8StringEncoding], "-sdk", sdkpath, "-emit-ir", "-parse-as-library",
> "-Onone", "-o", [destFilePath cStringUsingEncoding:NSUTF8StringEncoding]};
>
> The swift front-end entry call.
>
> frontend_main(llvm::ArrayRef<const char *>(argv, 13), "LLVMTest", (void
> *)(intptr_t)"");
>
> On Sat, Apr 30, 2016 at 9:35 AM, Daniel Dunbar <daniel_dunbar at apple.com>
> wrote:
>
>> If the hash value of the module is different then most likely something
>> else is going on -- are you passing any special flags or defines as part of
>> the compiler command? If you run the same command from swiftc on the
>> command line do you see the same behavior?
>>
>>  - Daniel
>>
>> On Apr 29, 2016, at 2:08 PM, Ramakrishna Mallireddy <
>> ramakrishna.malli at gmail.com> wrote:
>>
>> Every-time I run swift frontend the clang creates a new cachedir with
>> modulecache path hash(on every run the hash value is different for the same
>> input string) as the name of the dir and generates default cocoa framework
>> pcm files inside it.
>>
>> I am using the swift front-end c++ api's to compile a simple swift file.
>> If I set the -fdisable-module-hash, then pcm files are generated without
>> the hash as required under the ModuleCache Dir.
>> so problem is solved as clang now see the existing pcm files, but now I
>> hit the next hurdle.
>>
>> Now the pcm files are there in the cache, when I run the frontend again,
>> I assume clang will load the AST from the pcm files but clang *ReadAST *returns
>> with *ASTReader::OutOfDate *and as usual it calls *compileAndLoadModule *which
>> I want to avoid in the first place*.*
>>
>> Call to *CLang*::*CompilerInstance*::*ModuleManager*->*ReadAST*
>> (ModuleFileName,
>>
>>                                    serialization::MK_ImplicitModule,
>>
>>                                    ImportLoc, ARRFlags) return with
>> *ASTReader::OutOfDate*
>>
>> as *ReadASTCore*(FileName, Type, ImportLoc,  /*ImportedBy=*/nullptr,
>> Loaded, 0, 0, 0, ClientLoadCapabilities) returns with *OutOfDate.*
>>
>> These files are generated just few minutes ago, how can it be OutOfDate I
>> don't have any idea.
>>
>> File* modules.timestamp* under the ModuleCache Dir is 0 bytes.
>>
>> Thanks
>>
>> Ramakrishna
>>
>> On Fri, Apr 29, 2016 at 9:15 PM, Daniel Dunbar <daniel_dunbar at apple.com>
>> wrote:
>>
>>> Clang will cache these automatically, can you give more details on
>>> exactly what you are seeing?
>>>
>>>  - Daniel
>>>
>>> > On Apr 28, 2016, at 10:50 PM, Ramakrishna Mallireddy via swift-users <
>>> swift-users at swift.org> wrote:
>>> >
>>> > I have these precompiled module files generated every-time I run the
>>> swift compiler.
>>> >
>>> > _Builtin_stddef_max_align_t-1LMTETLX3WNFT.pcm
>>> > CFNetwork-1UTIO6DPB9R5P.pcm
>>> > CoreFoundation-CF8BGN41VJ11.pcm
>>> > CoreGraphics-3SDFP08OX46EF.pcm
>>> > CoreImage-3SDFP08OX46EF.pcm
>>> > Darwin-4F8STAM1KXDF.pcm
>>> > Foundation-2LQ7EQYFLQOP.pcm
>>> > ...etc
>>> >
>>> > How can I make the swift compiler to use these cache rather than
>>> compiling the libraries again.
>>> >
>>> > Thanks
>>> > Ramakrishna
>>> > _______________________________________________
>>> > swift-users mailing list
>>> > swift-users at swift.org
>>> > https://lists.swift.org/mailman/listinfo/swift-users
>>>
>>>
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-users/attachments/20160504/e5b00c28/attachment.html>