Re: [Buildroot] [PATCH 1/1] package/icu: needs C++17

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Bernd,

On Sat,  3 Jan 2026 16:49:04 +0100
Bernd Kuhls <bernd@kuhls.net> wrote:

> Buildroot commit dcee99507c6767230fd1faeeefe95f5662eb03a3 bumped icu from
> version 73-2 to 77-1.
> 
> Upstream raised the minimum C++ requirement to C++17 in version 75-1:
> 
> https://github.com/unicode-org/icu/releases/tag/release-75-1
> https://icu.unicode.org/download/75
> "C++ code now requires C++17 [...]"
> 
> This commit switches the minimum gcc version to 7.
> 
> No autobuilder errors were recorded which relate to the gcc version used.
> 
> Signed-off-by: Bernd Kuhls <bernd@kuhls.net>

Thanks, I did test and indeed the build fails with gcc 6.x, but works
with gcc 7.x, so I've applied, but I had to make quite a few additional
tweaks:

diff --git a/package/gerbera/Config.in b/package/gerbera/Config.in
index 3372d86fba..c5f7cf9cd1 100644
--- a/package/gerbera/Config.in
+++ b/package/gerbera/Config.in
@@ -3,6 +3,7 @@ config BR2_PACKAGE_GERBERA
        depends on BR2_USE_MMU # fork()
        depends on BR2_TOOLCHAIN_HAS_ATOMIC
        depends on BR2_TOOLCHAIN_HAS_THREADS
+       depends on BR2_HOST_GCC_AT_LEAST_7 # icu
        depends on BR2_TOOLCHAIN_GCC_AT_LEAST_8 # C++17 filesystem
        depends on BR2_INSTALL_LIBSTDCPP
        depends on !BR2_STATIC_LIBS
@@ -28,9 +29,10 @@ config BR2_PACKAGE_GERBERA
 
          https://gerbera.io
 
-comment "gerbera needs a toolchain w/ C++, dynamic library, threads, wchar, gcc >= 8"
+comment "gerbera needs a toolchain w/ C++, dynamic library, threads, wchar, gcc >= 8, host gcc >= 7"
        depends on BR2_USE_MMU
        depends on BR2_TOOLCHAIN_HAS_ATOMIC
        depends on !BR2_INSTALL_LIBSTDCPP || BR2_STATIC_LIBS || \
                !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR || \
-               !BR2_TOOLCHAIN_GCC_AT_LEAST_8
+               !BR2_TOOLCHAIN_GCC_AT_LEAST_8 || \
+               !BR2_HOST_GCC_AT_LEAST_7
diff --git a/package/icu/Config.in b/package/icu/Config.in
index 542acc4187..f5686085dd 100644
--- a/package/icu/Config.in
+++ b/package/icu/Config.in
@@ -3,7 +3,7 @@ config BR2_PACKAGE_ICU
        depends on BR2_INSTALL_LIBSTDCPP
        depends on BR2_USE_WCHAR
        depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # C++17
-       depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # C++17
+       depends on BR2_HOST_GCC_AT_LEAST_7 # host-icu
        depends on BR2_TOOLCHAIN_HAS_THREADS
        # icu does some funky things by generating by itself an ELF
        # file, and it cannot easily be changed to generate FLAT
diff --git a/package/qt5/qt5webengine/Config.in b/package/qt5/qt5webengine/Config.in
index 0dd1483c57..2c16d819d2 100644
--- a/package/qt5/qt5webengine/Config.in
+++ b/package/qt5/qt5webengine/Config.in
@@ -10,10 +10,11 @@ config BR2_PACKAGE_QT5WEBENGINE_ARCH_SUPPORTS
        depends on !BR2_BINFMT_FLAT # qt5base-icu
        depends on BR2_USE_MMU # libglib2, qt5base-dbus
 
-comment "qt5webengine needs udev /dev management and a glibc toolchain w/ host gcc >= 7, threads, wchar"
+comment "qt5webengine needs udev /dev management and a glibc toolchain w/ gcc >= 7, threads, wchar, host gcc >= 7"
        depends on BR2_PACKAGE_QT5WEBENGINE_ARCH_SUPPORTS
        depends on !BR2_PACKAGE_HAS_UDEV || !BR2_TOOLCHAIN_USES_GLIBC || \
                !BR2_HOST_GCC_AT_LEAST_7 || \
+               !BR2_TOOLCHAIN_GCC_AT_LEAST_7 || \
                !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR
 
 comment "qt5webengine needs an OpenGL and EGL-capable backend"
@@ -24,6 +25,7 @@ config BR2_PACKAGE_QT5WEBENGINE
        bool "qt5webengine"
        depends on BR2_PACKAGE_QT5WEBENGINE_ARCH_SUPPORTS
        depends on BR2_TOOLCHAIN_USES_GLIBC # execinfo.h, mallinfo
+       depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # qt5base-icu
        depends on BR2_HOST_GCC_AT_LEAST_7 # qt5base-icu
        depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL # libvpx
        depends on BR2_USE_WCHAR # libglib2

Thanks a lot for having looked into this, much appreciated!

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