linux-imx: include/uapi/linux/ipu.h redefines standard integer types

ernest_tdx — Thu, 30 Apr 2026 15:30:54 GMT

Hi,

I'm using the Toradex BSP master branch to build for the Verdin iMX8MM. This BSP uses the meta-freescale layer to support the NXP SoCs. There, things are being updated to follow NXP BSP 6.18.2. In particular, imx-gst1.0-plugin is now at version "MM_04.10.03_2512_L6.18.2", and linux-imx and linux-imx-headers are now at lf-6.18.y.

When building imx-gst1.0-plugin with Yocto/OE for the verdin-imx8mm, I noticed the following build error:
MACHINE=verdin-imx8mm bitbake imx-gst1.0-plugin:

| In file included from ../sources/imx-gst1.0-plugin-4.10.3+git/libs/v4l2_core/gstimxv4l2.c:29: | /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/recipe-sysroot/usr/include/imx/linux/ipu.h:42:17: error: two or more data types in declaration specifiers | 42 | #define uint8_t unsigned char | | ^~~~~~~~ | /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/recipe-sysroot/usr/include/imx/linux/ipu.h:42:26: error: two or more data types in declaration specifiers | 42 | #define uint8_t unsigned char | | ^~~~ | /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/recipe-sysroot/usr/include/imx/linux/ipu.h:41:18: error: two or more data types in declaration specifiers | 41 | #define uint16_t unsigned short | | ^~~~~~~~ | /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/recipe-sysroot/usr/include/imx/linux/ipu.h:41:27: error: two or more data types in declaration specifiers | 41 | #define uint16_t unsigned short | | ^~~~~ | /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/recipe-sysroot/usr/include/imx/linux/ipu.h:40:18: error: two or more data types in declaration specifiers | 40 | #define uint32_t unsigned int | | ^~~~~~~~ | /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/recipe-sysroot/usr/include/imx/linux/ipu.h:40:27: error: two or more data types in declaration specifiers | 40 | #define uint32_t unsigned int | | ^~~ [...] | ninja: build stopped: subcommand failed. | INFO: autodetecting backend as ninja | INFO: calculating backend command to run: /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/recipe-sysroot-native/usr/bin/ninja -j 64 -v | WARNING: exit code 1 from a shell command. NOTE: recipe imx-gst1.0-plugin-4.10.3+git-r0: task do_compile: Failed ERROR: Task (/workdir/oe/build/../layers/meta-freescale/recipes-multimedia/gstreamer/imx-gst1.0-plugin_git.bb:do_compile) failed with exit code '1' NOTE: recipe gstreamer1.0-plugins-bad-1.26.6.imx-r0: task do_package: Succeeded NOTE: Tasks Summary: Attempted 10003 tasks of which 8796 didn't need to be rerun and 1 failed. NOTE: Writing buildhistory NOTE: Writing buildhistory took: 6 seconds Summary: 1 task failed: /workdir/oe/build/../layers/meta-freescale/recipes-multimedia/gstreamer/imx-gst1.0-plugin_git.bb:do_compile log: /workdir/oe/tmp/work/armv8a-mx8mm-tdx-linux/imx-gst1.0-plugin/4.10.3+git/temp/log.do_compile.827805 Summary: There was 1 WARNING message. Summary: There was 1 ERROR message, returning a non-zero exit code.

This happens because "include/imx/linux/ipu.h" is redefining types that are already set as a typedef in "linux/types.h", which is included by ipu.h. It is probably pure chance that this error was not triggered by a userspace program consuming this header before, due to a different include order.

The solution seems relatively straightforward to me: remove the macro defines of uint*_t, which already exist anyways. My assumption is these just remained from some historical growth but there should be no reason for them in a Linux context.

I've attached a patch with what I believe is a decent solution, on top of lf-6.18.y, which fixes my build problems. Any feedback or the integration of this patch would certainly be appreciated.

Thanks,
Ernest - Toradex

Re: linux-imx: include/uapi/linux/ipu.h redefines standard integer types

dbaluta — Fri, 08 May 2026 07:13:17 GMT

@ernest_tdx

Hello,

We have a similar patch in our lf-6.18 branch scheduled for Q2 2026 Release. Can you please test it and see if it fixes your issue?

Re: linux-imx: include/uapi/linux/ipu.h redefines standard integer types

ernest_tdx — Fri, 08 May 2026 08:59:46 GMT

Hi @dbaluta,

The patch you attached seems reasonable as well, I double checked and can confirm this patch also solves the issues.

I really appreciate NXP taking a look at the patches submitted here. If we can ever get a way to find such patches before a major release, that would of course be very helpful for us in backporting them

Thanks and kind regards,

Ernest

i.MX ProcessorsのトピックRe: linux-imx: include/uapi/linux/ipu.h redefines standard integer types

linux-imx: include/uapi/linux/ipu.h redefines standard integer types

Re: linux-imx: include/uapi/linux/ipu.h redefines standard integer types

Re: linux-imx: include/uapi/linux/ipu.h redefines standard integer types