[llvm-dev] Building libjpeg-turbo with LTO

[Shishir V Jessu via llvm-dev]

To correct a typo: I am using both clang 6.0.0, and a local build of clang
10.0.0, and each result in the same error.

Best,
Shishir Jessu

On Wed, Apr 8, 2020 at 12:22 PM Shishir V Jessu <shishir.jessu at utexas.edu>
wrote:

> Hi,
>
> I have tried to build libjpeg-turbo
> <https://github.com/libjpeg-turbo/libjpeg-turbo> with LTO in LLVM, using
> both clangbut get many errors in lld that look like the following:
>
> ld: error: undefined symbol: jpeg_std_error
> >>> referenced by jcstest.c:76
> >>>               lto.tmp:(main)
>
> ld: error: undefined symbol: jpeg_CreateCompress
> >>> referenced by jcstest.c:86
> >>>               lto.tmp:(main)
>
> ld: error: undefined symbol: jpeg_set_defaults
> >>> referenced by jcstest.c:88
> >>>               lto.tmp:(main)
>
> ld: error: undefined symbol: jpeg_default_colorspace
> >>> referenced by jcstest.c:90
> >>>               lto.tmp:(main)
> >>> referenced by jcstest.c:114
> >>>               lto.tmp:(main)
>
> This only occurs when compiling with the -flto flag. Has anyone been able
> to build libjpeg-turbo with LTO? Are there any modifications I need to make
> to the makefile or other configuration in order to do so? Thanks for your
> help!
>
> Best,
> Shishir Jessu
>
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