[Buildroot] [PATCH] package/qt5/qt5base: do not link against host libatomic when building host tools within qt5* target packages

[Quentin Schulz]

qt5declarative builds qmltyperegistrar for the host as part of its build
process.
When building qt target packages (which is the case for qt5declarative),
-spec devices/linux-buildroot-g++ is passed to qmake in QT5_QMAKE
variable and this spec currently has -latomic in its LIBS.

This -latomic makes it to the build of the host build of
qmltyperegistrar which is not useful.

This was discovered on Fedora 34 where libatomic is not pulled with gcc
package, therefore was missing on the host machine.

This makes sure that -latomic is not added for host build of qt
packages.

Fixes: 7d286be4f9 ("package/qt5base: link with -latomic when needed")

Cc: Quentin Schulz <foss at 0leil.net>
Suggested-by: Arnout Vandecappelle <arnout at mind.be>
Signed-off-by: Quentin Schulz <quentin.schulz at theobroma-systems.com>
---
 package/qt5/qt5base/qt5base.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/qt5/qt5base/qt5base.mk b/package/qt5/qt5base/qt5base.mk
index 8b55aa3098..9da3de468a 100644
--- a/package/qt5/qt5base/qt5base.mk
+++ b/package/qt5/qt5base/qt5base.mk
@@ -277,7 +277,7 @@ QT5BASE_ARCH_CONFIG_FILE = $(@D)/mkspecs/devices/linux-buildroot-g++/arch.conf
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 # Qt 5.8 needs atomics, which on various architectures are in -latomic
 define QT5BASE_CONFIGURE_ARCH_CONFIG
-	printf 'LIBS += -latomic\n' >$(QT5BASE_ARCH_CONFIG_FILE)
+	printf '!host_build { \n LIBS += -latomic\n }' >$(QT5BASE_ARCH_CONFIG_FILE)
 endef
 endif
 
-- 
2.31.1