I'm trying to build a wrapper around a lib written in C by having importC compile the .c files, and then providing a nice D API on top. My dub config file seems to be finding the C files to compile without issue, but it's not passing the include dirs for the preprocessor to find headers. Is there an option I'm missing or is there some way to get DUB to do this for me aside from passing like -cpp flags via dflags?

From my dub.json:

    "cSourcePaths": [
        "source/libgit2/src/",
        "source/libgit2/src/util/"
    ],
    "cImportPaths" : [
        "source/libgit2/src/util/",
        "source/libgit2/src/libgit2/"
    ],
    "importPaths" : [
        "source/libgit2/src/util/",
    ],

    "excludedSourceFiles" : [
        "source/libgit2/src/cli/*.c"
    ],

And the what dub's actually running when it preprocesses the first .c file:

/usr/bin/cc -fno-blocks -dD -Wno-builtin-macro-redefined -E -include /opt/homebrew/Cellar/ldc/1.34.0/include/dlang/ldc/importc.h source/libgit2/src/libgit2/annotated_commit.c -o /var/folders/p3/6fcprxgn0xb77hzb031vm1_m0000gn/T/itmp-ldc-de8fa3/annotated_commit.i

Which has doesn't specify any -I flags

On Wednesday, 13 September 2023 at 22:48:01 UTC, Ben Jones wrote:

Real world example from ImportC inventors or DUB maintainers would be great to have.
Thanks

On Wednesday, 13 September 2023 at 22:48:01 UTC, Ben Jones wrote:

This should have been fixed by https://github.com/dlang/dub/pull/2818, so make sure you use a recent dub version.

On Wednesday, 1 October 2025 at 10:07:48 UTC, Sergey wrote:

Filed issue
https://github.com/dlang/dub/issues/3075

On Wednesday, 1 October 2025 at 14:36:13 UTC, jmh530 wrote:

Actually planning to take this on for SAoC. I don't know how possible that would be.

Thanks!

On Wednesday, 1 October 2025 at 19:02:26 UTC, Emmanuel wrote:

I wouldn’t go too crazy. There’s a folder with simple examples already [1]. I would just do something with a simple C function that gets called in a D project (and the C function is in a separate sub folder).

[1] https://github.com/dlang/dub/tree/master/examples

On Wednesday, 1 October 2025 at 23:03:10 UTC, jmh530 wrote:

As kinke pointed out on the issue, when a prior bug got fixed a test was added that covers this. I would suggest borrowing that for the example.

On Thursday, 2 October 2025 at 18:49:51 UTC, jmh530 wrote:

Alright noted!