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@@ -13,10 +13,22 @@ CONNTRACK_TOOLS_DEPENDENCIES = host-pkgconf \
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CONNTRACK_TOOLS_LICENSE = GPLv2+
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CONNTRACK_TOOLS_LICENSE_FILES = COPYING
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+CONNTRACK_TOOLS_CFLAGS = $(TARGET_CFLAGS)
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+
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+# Some of conntrack-tools source files include both linux/in.h (via
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+# linux/netfilter.h for kernel headers >= 4.2) and netinet/in.h, which
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+# causes some symbol conflicts when musl is used. Defining __GLIBC__
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+# works around that issue since the kernel headers are prepared to
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+# avoid redefinition of certain symbols when they see __GLIBC__.
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+ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
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+CONNTRACK_TOOLS_CFLAGS += -D__GLIBC__
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+endif
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+
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ifeq ($(BR2_PACKAGE_LIBTIRPC),y)
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-CONNTRACK_TOOLS_CONF_ENV += \
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- CFLAGS="$(TARGET_CFLAGS) `$(PKG_CONFIG_HOST_BINARY) --cflags libtirpc`"
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+CONNTRACK_TOOLS_CFLAGS += `$(PKG_CONFIG_HOST_BINARY) --cflags libtirpc`
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CONNTRACK_TOOLS_DEPENDENCIES += libtirpc host-pkgconf
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endif
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+CONNTRACK_TOOLS_CONF_ENV = CFLAGS="$(CONNTRACK_TOOLS_CFLAGS)"
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+
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$(eval $(autotools-package))
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