Re: [Buildroot] [PATCH] package/harfbuzz: fix host build failure due to C++11

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

On Sat, 25 Dec 2021 22:46:38 +0100
Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:

> Package harfbuzz fails to build for host with error:
> ```
> ../src/hb-map.hh:67:18: error: 'is_trivially_copyable' is not a member of 'std'
>    static_assert (std::is_trivially_copyable<K>::value, "");
> ```
> 
> Only starting from gcc version 5.0 we have 'is_trivially_copyable' member
> of std. So let's depend on BR2_HOST_GCC_AT_LEAST_5 for harfbuzz. Let's
> also depend on it in pango package which is the only one which needs
> host-harfbuzz.
> 
> Fixes:
> http://autobuild.buildroot.net/results/89e1194c1659d7e1af9db8ffe5feee770c448f76
> 
> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
> ---
>  package/harfbuzz/Config.in | 6 ++++--
>  package/pango/Config.in    | 4 +++-
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/package/harfbuzz/Config.in b/package/harfbuzz/Config.in
> index 2e4219ee22..81acebce46 100644
> --- a/package/harfbuzz/Config.in
> +++ b/package/harfbuzz/Config.in
> @@ -3,6 +3,7 @@ config BR2_PACKAGE_HARFBUZZ
>  	depends on BR2_INSTALL_LIBSTDCPP
>  	depends on BR2_TOOLCHAIN_HAS_SYNC_4
>  	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
> +	depends on BR2_HOST_GCC_AT_LEAST_5 # C++11

It is kind of hard to believe that it would require gcc 5.0 on the
host, but only gcc 4.9 for the target.

Could you clarify this?

Thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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