lldb not working when C module includes a header outside of it's /include dir

Andrey_Fidrya · November 9, 2016, 7:48pm

Hi All,

When C module includes a header outside of module's include/ directory and
not residing in /usr/local/include or /usr/include, lldb stops showing variable
values for the entire application.

I've created a ticket with a test project and additional details in the bug tracker,
any help is appreciated:

github.com/apple/llvm-project

[SR-3169] lldb stops working when C module includes a header outside of module's include/ dir

opened 07:39PM - 09 Nov 16 UTC

closed 10:11PM - 29 Apr 17 UTC

swift-ci

bug LLDB for Swift

| | | |------------------|-----------------|… |Previous ID | SR-3169 | |Radar | None | |Original Reporter | zmeyc (JIRA User) | |Type | Bug | |Status | Closed | |Resolution | Invalid | <details> <summary>Environment</summary> OS X, Xcode 8.2 beta (8C23) </details> <details> <summary>Additional Detail from JIRA</summary> | | | |------------------|-----------------| |Votes | 0 | |Component/s | LLDB for Swift | |Labels | Bug | |Assignee | None | |Priority | Medium | md5: ff8ca5b36378a02cd00801a6b06efbbc </details> **relates to**: * [SR-2192](https://bugs.swift.org/browse/SR-2192) Swift's LLDB cannot import system modules and prevents debugging * [SR-2764](https://bugs.swift.org/browse/SR-2764) LLDB fails to to import a Clang module imported into Swift **Issue Description:** When C module references a header outside of module's include/ directory, lldb stops showing variable values for the entire application. **UPDATE** debugging works if C module is in a separate repository. So, this problem is only present if there are two modules in same repo's Sources/ dir. I reproduced this with a minimal example. Steps to reproduce: ``` java git clone https://github.com/zmeyc/lldbtest open lldbtest.xcodeproj ``` Choose Main target, put the breakpoint at print() in main.swift. Run the app. In Debugger, choose "Show all variables". Value of variable "i" won't be printed. In lldb, type "p i", which will produce: ``` java (lldb) p i warning: Swift error in module Main. Debug info from this module will be unavailable in the debugger. error: in auto-import: failed to get module 'Main' from AST context: ``` Detailed description: I created a Swift app with the following structure: ``` java lldbtest ThirdParty thirdpartylib.h - a header file from some third-party library. Source CLib - a C module which includes <thirdpartylib.h> and exposes it to Swift code. Main - main.swift which calls a function from thirdpartylib ``` The app compiles and works fine from console: ``` java swift build -Xcc -I"$(shell pwd)/ThirdParty" ``` If you want to regenerate the xcodeproj: ``` java rm -rf lldbtest.xcodeproj swift package generate-xcodeproj open lldbtest.xcodeproj Select "Main" target -> Build Settings. Add "$(SRCROOT)/ThirdParty" to Header Search Paths. Add "$(SRCROOT)/Sources/CLib" to Import Paths. ``` The app will now compile and run, but debugging won't work.

Andrey

Andrey_Fidrya · November 10, 2016, 7:39pm

Hi All,

Update: I've found that debugging works if C module is in a separate repository. So, this problem is only present if there are two modules in Sources/ dir of the same repo. It doesn't matter if headers are located in /usr/local/include or in other location.

Andrey

···

On 09 Nov 2016, at 22:48, Andrey Fidrya <af@zabiyaka.com> wrote:

Hi All,

When C module includes a header outside of module's include/ directory and
not residing in /usr/local/include or /usr/include, lldb stops showing variable
values for the entire application.

I've created a ticket with a test project and additional details in the bug tracker,
any help is appreciated:
[SR-3169] lldb stops working when C module includes a header outside of module's include/ dir · Issue #4577 · apple/llvm-project · GitHub

Andrey

Jim_Ingham · November 10, 2016, 8:56pm

Could you put the working example in the bug as well?

Jim

···

On Nov 10, 2016, at 11:39 AM, Andrey Fidrya via swift-users <swift-users@swift.org> wrote:

Hi All,

Update: I've found that debugging works if C module is in a separate repository. So, this problem is only present if there are two modules in Sources/ dir of the same repo. It doesn't matter if headers are located in /usr/local/include or in other location.

Andrey

On 09 Nov 2016, at 22:48, Andrey Fidrya <af@zabiyaka.com> wrote:

Hi All,

When C module includes a header outside of module's include/ directory and
not residing in /usr/local/include or /usr/include, lldb stops showing variable
values for the entire application.

I've created a ticket with a test project and additional details in the bug tracker,
any help is appreciated:
[SR-3169] lldb stops working when C module includes a header outside of module's include/ dir · Issue #4577 · apple/llvm-project · GitHub

Andrey

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