Re: Bug#1121240: libhdf4: FTBFS on armhf (-Wincompatible-pointer-types)

On 2025-11-23 04:33, Sebastiaan Couwenberg wrote:
> Making this a warning with following does not resolve the FTBFS:
> 
>  ifneq (,$(filter $(DEB_BUILD_ARCH),armhf))
>  export DEB_CFLAGS_MAINT_APPEND = -Wno-error=incompatible-pointer-types
>  endif
> 
> It then fails due to:
> 
>  array.c:399:21: error: too many arguments to function 'xlen_funct'; expected 0, have 1
>    399 |             len += (*xlen_funct)(vp);
>        |                    ~^~~~~~~~~~~~ ~~
> 

The prototype of xlen_funct has no arguments defined. In C23 declaring a
function as int foo() is equivalent as declaring that it takes no
argument, hence calling it with arguments becomes an error. See:
https://en.wikipedia.org/wiki/C23_(C_standard_revision)#Syntax

You can either fix the code or tell the compiler to stick to older
versions of the standard, something like:

  export DEB_CFLAGS_MAINT_APPEND += -std=c17