[Buildroot] [PATCH v1 2/2] package/pipewire: fix uclibc compile (getrandom related)

[Yann E. MORIN]

Peter, All,

On 2021-05-12 22:42 +0200, Peter Seiderer spake thusly:
> The getrandom() detection from meson.build failes with the following error
> message:
> 
>   .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:27:35: error: unknown type name 'size_t'
>      27 | extern int getrandom(void *__buf, size_t count, unsigned int flags)
>         |                                   ^~~~~~
>   .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:8:1: note: 'size_t' is defined in header '<stddef.h>'; did you forget to '#include <stddef.h>'?
> 
> Fix it by adding stddef.h include to the meson getrandom() detection.
> 
> Fixes:
> 
>   - http://autobuild.buildroot.net/results/7e131bec458bf5c263ee1858d38ed5dc3cf704a6
> 
>   ../src/pipewire/impl-core.c:54:9: error: conflicting types for ‘getrandom’
>      54 | ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
>         |         ^~~~~~~~~
>   In file included from ../src/pipewire/impl-core.c:34:
>   .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:27:12: note: previous declaration of ‘getrandom’ was here
>      27 | extern int getrandom(void *__buf, size_t count, unsigned int flags)
>         |            ^~~~~~~~~
> 
> Signed-off-by: Peter Seiderer <ps.report at gmx.net>
> ---
> Notes:
>   - maybe this failure is more a uclibc defect (missing include in
>     sys/random.h) and should be fixed there?

Maybe, indeed. Can you see with them if they need a fix in their
headers?

However, there are uClibc-ng versions out there that will lack this
missing include, so we have to cater for them.

Applied to next, thanks.

Regards,
Yann E. MORIN.

>   - fix for same/similare failure was suggested already here [1] (by
>     adding -D_GNU_SOURCE), and suggestd patch is accepted/merged upstream
>     and is already present in the 0.3.27 source code, but did not fix
>     the failure...
> 
> [1] https://patchwork.ozlabs.org/project/buildroot/patch/20210504211016.1216759-1-fontaine.fabrice@gmail.com/
> ---
>  ...n-fix-getrandom-detection-for-uclibc.patch | 49 +++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 package/pipewire/0002-meson-fix-getrandom-detection-for-uclibc.patch
> 
> diff --git a/package/pipewire/0002-meson-fix-getrandom-detection-for-uclibc.patch b/package/pipewire/0002-meson-fix-getrandom-detection-for-uclibc.patch
> new file mode 100644
> index 0000000000..e902869ce9
> --- /dev/null
> +++ b/package/pipewire/0002-meson-fix-getrandom-detection-for-uclibc.patch
> @@ -0,0 +1,49 @@
> +From a36bc959768e100d2d72e027746e3a9d95cf29af Mon Sep 17 00:00:00 2001
> +From: Peter Seiderer <ps.report at gmx.net>
> +Date: Wed, 12 May 2021 22:08:39 +0200
> +Subject: [PATCH] meson: fix getrandom detection for uclibc
> +MIME-Version: 1.0
> +Content-Type: text/plain; charset=UTF-8
> +Content-Transfer-Encoding: 8bit
> +
> +The getrandom() detection from meson.build failes with the following error
> +message:
> +
> +  .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:27:35: error: unknown type name 'size_t'
> +     27 | extern int getrandom(void *__buf, size_t count, unsigned int flags)
> +        |                                   ^~~~~~
> +  .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:8:1: note: 'size_t' is defined in header '<stddef.h>'; did you forget to '#include <stddef.h>'?
> +
> +Fix it by adding stddef.h include to the meson getrandom() detection.
> +
> +Fixes:
> +
> +  ../src/pipewire/impl-core.c:54:9: error: conflicting types for ‘getrandom’
> +     54 | ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
> +        |         ^~~~~~~~~
> +  In file included from ../src/pipewire/impl-core.c:34:
> +  .../host/x86_64-buildroot-linux-uclibc/sysroot/usr/include/sys/random.h:27:12: note: previous declaration of ‘getrandom’ was here
> +     27 | extern int getrandom(void *__buf, size_t count, unsigned int flags)
> +        |            ^~~~~~~~~
> +
> +Signed-off-by: Peter Seiderer <ps.report at gmx.net>
> +---
> + meson.build | 2 +-
> + 1 file changed, 1 insertion(+), 1 deletion(-)
> +
> +diff --git a/meson.build b/meson.build
> +index 03a9d174..01b4c7c8 100644
> +--- a/meson.build
> ++++ b/meson.build
> +@@ -274,7 +274,7 @@ if cc.has_function('memfd_create', prefix : '#include <sys/mman.h>', args : [ '-
> +   cdata.set('HAVE_MEMFD_CREATE', 1)
> + endif
> + 
> +-if cc.has_function('getrandom', prefix : '#include <sys/random.h>', args : [ '-D_GNU_SOURCE' ])
> ++if cc.has_function('getrandom', prefix : '#include <stddef.h>\n#include <sys/random.h>', args : [ '-D_GNU_SOURCE' ])
> +   cdata.set('HAVE_GETRANDOM', 1)
> + endif
> + 
> +-- 
> +2.31.1
> +
> -- 
> 2.31.1
> 
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