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tcpdump, libpcap: simplify and fix ac_cv_linux_vers

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For some reason, tcpdump and libpcap need to have some information
about the kernel version being used. This information is passed using
the ac_cv_linux_vers autoconf variable.

However, the current value is determined using
BR2_DEFAULT_KERNEL_HEADERS which is only defined when an internal
Buildroot toolchain is used. So it would break with an external
toolchain or the Crosstool-NG backend.

According to Mike Frysinger at
http://lists.busybox.net/pipermail/buildroot/2011-January/040861.html,
this value is only used to determine if the kernel version is 0.x, 1.x
or 2.x, so passing ac_cv_linux_vers=2 is sufficient since Buildroot
only supports the 2.6 kernel anyway.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni 2011-01-25 09:46:58 +01:00 committed by Peter Korsgaard
parent 58d107ec3f
commit 4c6a451ac9
2 changed files with 2 additions and 2 deletions
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2
package/libpcap/libpcap.mk
View File

@ -14,7 +14,7 @@ LIBPCAP_INSTALL_TARGET_OPT= DESTDIR="$(TARGET_DIR)" \
LIBPCAP_INSTALL_STAGING_OPT= DESTDIR="$(STAGING_DIR)" install \
$(if $(BR2_PREFER_STATIC_LIB),,install-shared)
LIBPCAP_DEPENDENCIES:=zlib
LIBPCAP_CONF_ENV:=ac_cv_linux_vers=$(firstword $(subst .,$(space),$(firstword $(call qstrip,$(BR2_DEFAULT_KERNEL_HEADERS))))) \
LIBPCAP_CONF_ENV:=ac_cv_linux_vers=2 \
ac_cv_header_linux_wireless_h=yes # configure misdetects this
LIBPCAP_CONF_OPT:=--disable-yydebug --with-pcap=linux

2
package/tcpdump/tcpdump.mk
View File

@ -9,7 +9,7 @@
TCPDUMP_VERSION:=4.1.1
TCPDUMP_SITE:=http://www.tcpdump.org/release
TCPDUMP_SOURCE:=tcpdump-$(TCPDUMP_VERSION).tar.gz
TCPDUMP_CONF_ENV:=ac_cv_linux_vers=$(firstword $(subst .,$(space),$(firstword $(call qstrip,$(BR2_DEFAULT_KERNEL_HEADERS)))))
TCPDUMP_CONF_ENV:=ac_cv_linux_vers=2
TCPDUMP_CONF_OPT:=--without-crypto \
$(if $(BR2_PACKAGE_TCPDUMP_SMB),--enable-smb,--disable-smb)
TCPDUMP_DEPENDENCIES:=zlib libpcap