[cfe-dev] Problem with relinking

[Don Hinton via cfe-dev]

Hi Tom:

I've got a smaller test case which only involves part of
clang-tools-extra.  At least it's only a few files that get relinked, but
when I make a change to an llvm file, it relinks 90+ binaries.

I only need to touch a file in my new checker to get this behavior.  If I
run ninja after touching a file, it'll recompile that file, then relink
everything in clang-tidy.  And if I run ninja again, without doing anything
else, it will relink all the same binaries:

local:/Users/dhinton/projects/llvm_project/monorepo/build/Debug $ ninja
[11/11] Linking CXX executable bin/c-index-test
local:/Users/dhinton/projects/llvm_project/monorepo/build/Debug $ ninja
[10/10] Linking CXX executable bin/c-index-test

Still now sure what's going on...




On Tue, Mar 26, 2019 at 1:49 PM Don Hinton <hintonda at gmail.com> wrote:

> <resending to list>
>
> $ cat ~/projects/misc/cmake/llvm-debug.cmake
> set(CMAKE_BUILD_TYPE Debug CACHE STRING "")
> set(LLVM_OPTIMIZED_TABLEGEN ON CACHE BOOL "")
> set(LLVM_APPEND_VC_REV OFF CACHE BOOL "")
> set(LLVM_ENABLE_PROJECTS clang clang-tools-extra libcxx libcxxabi CACHE
> STRING "")
> set(LLVM_TARGETS_TO_BUILD "X86" CACHE STRING "")
> set(LLVM_LIT_ARGS '-v' CACHE STRING "")
> find_program(GOLD NAMES gold ld.gold)
> if(GOLD)
>   set(LLVM_USE_LINKER "gold" CACHE STRING "")
> endif()
> set(CMAKE_C_FLAGS "-I/opt/local/include ${CMAKE_C_FLAGS}" CACHE STRING "")
> set(CMAKE_CXX_FLAGS "-I/opt/local/include ${CMAKE_CXX_FLAGS}" CACHE STRING
> "")
>
> $ cmake -C <path-to>/llvm-debug.cmake -GNinja <path-to-llvm>
>
>
> On Tue, Mar 26, 2019 at 1:15 PM Tom Stellard <tstellar at redhat.com> wrote:
>
>> On 03/26/2019 12:51 PM, Don Hinton via cfe-dev wrote:
>> > I've noticed that whenever I rebuild, say after updating tree or
>> switching branches, I can run ninja and everything seems to build fine.
>> However, if I rerun ninja again, without touching anything, it relinks
>> everything, but only does this once.  I've investigated a little, but don't
>> see anything obvious.
>> >
>> > Is anyone else seeing this?
>> >
>>
>> What CMake flags are you using?
>>
>> -Tom
>>
>> > I'm using the monorepo on a fully up to date Macbook Pro.
>> >
>> > thanks..
>> > don
>> >
>> >
>> > _______________________________________________
>> > cfe-dev mailing list
>> > cfe-dev at lists.llvm.org
>> > https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>> >
>>
>>
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