Re: [Buildroot] [PATCH 178/178] package/imagemagick: host SVG support needs host gcc >= 4.9

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Fabrice, All,

On 2021-12-19 00:10 +0100, Fabrice Fontaine spake thusly:
> host gcc >= 4.9 is needed since bump of harfbuzz to version 3.1.2 in
> commit 6861933d22006fbe8c961a41506beac826881f33 to avoid the following
> build failure:
> 
> In file included from ../src/hb-serialize.hh:36:0,
>                  from ../src/hb-machinery.hh:37,
>                  from ../src/hb-common.cc:30:
> ../src/hb-map.hh:67:18: error: 'is_trivially_copyable' is not a member of 'std'
>    static_assert (std::is_trivially_copyable<K>::value, "");
>                   ^

Where did you see that gcc 4.9 had it? I looked at the gcc-4_9_0-release
tag in the gcc tree, and it states:

    $ git grep is_trivially_copyable
    [...]
    libstdc++-v3/include/std/type_traits:  // is_trivially_copyable (still unimplemented)

Whereas gcc 5 has a proper implementation:

    $ git grep -A1 'is_trivially_copyable' libstdc++-v3/include/std/type_traits
    libstdc++-v3/include/std/type_traits:  // is_trivially_copyable
    libstdc++-v3/include/std/type_traits-  template<typename _Tp>
    libstdc++-v3/include/std/type_traits:    struct is_trivially_copyable
    libstdc++-v3/include/std/type_traits:    : public integral_constant<bool, __is_trivially_copyable(_Tp)>
    libstdc++-v3/include/std/type_traits-    { };

I see that 6861933d2200 (package/harfbuzz: bump to version 3.1.2) stated
that the requirement on the gcc version was bumped to 4.9 from 4.8, but
I am not sure how that can be...

Giulio, where did you get the info that gcc 4.9 was required (and not a
higher version)?

Regards,
Yann E. MORIN.

> Fixes:
>  - http://autobuild.buildroot.org/results/89e1194c1659d7e1af9db8ffe5feee770c448f76
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> ---
>  package/imagemagick/Config.in.host | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/package/imagemagick/Config.in.host b/package/imagemagick/Config.in.host
> index 671b0995dc..fe0ad9a748 100644
> --- a/package/imagemagick/Config.in.host
> +++ b/package/imagemagick/Config.in.host
> @@ -17,6 +17,7 @@ if BR2_PACKAGE_HOST_IMAGEMAGICK
>  config BR2_PACKAGE_HOST_IMAGEMAGICK_SVG
>  	bool "SVG support"
>  	depends on BR2_PACKAGE_HOST_RUSTC_ARCH_SUPPORTS # host-librsvg
> +	depends on BR2_HOST_GCC_AT_LEAST_4_9 # host-pango -> host-harfbuzz
>  	help
>  	  Say 'y' here is you need ImageMagick tools (like convert)
>  	  to support SVG.
> @@ -24,4 +25,7 @@ config BR2_PACKAGE_HOST_IMAGEMAGICK_SVG
>  	  This is not enabled by default, as it brings quite a few
>  	  extra dependencies, and thus extra build time.
>  
> +comment "SVG support needs a toolchain w/ host gcc >= 4.9"
> +	depends on !BR2_HOST_GCC_AT_LEAST_4_9
> +
>  endif
> -- 
> 2.33.0
> 
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