libpcap: build with cmake

The main motivation is to drop and stop maintaining
"100-debian_shared_lib.patch".  It lacks the logic to include custom
implementation of several functions like pcap_strlcpy() which can cause
build failures when glibc is used [2]

CAN and CAN-USB support related symbols are now handled by general linux
support, see [1]

"-ffunction-sections -fdata-sections" were removed as they should help
much for shared libraries

Size comparison before and after the change

  -rw-r--r-- 1 yunion yunion 238042 Oct 18 11:42 ipkg-x86_64/libpcap/usr/lib/libpcap.so.1

  lrwxrwxrwx 1 yunion yunion     16 Oct 18 13:03 ipkg-x86_64/libpcap/usr/lib/libpcap.so.1 -> libpcap.so.1.9.1
  -rwxr-xr-x 1 yunion yunion 229867 Oct 18 13:03 ipkg-x86_64/libpcap/usr/lib/libpcap.so.1.9.1

[1] On Linux, handle all CAN captures with pcap-linux.c, in cooked mode,
    https://github.com/the-tcpdump-group/libpcap/commit/93ca5ff7030aaf1219e1de05ec89a68384bfc50b
[2] https://github.com/openwrt/packages/issues/10270

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/package/libs/libpcap/patches/102-skip-manpages.patch b/package/libs/libpcap/patches/102-skip-manpages.patch
new file mode 100644
index 0000000000..28f572c913
--- /dev/null
+++ b/package/libs/libpcap/patches/102-skip-manpages.patch
@@ -0,0 +1,75 @@
+From f172e36e436d714f4def1439b13efd147a6a8411 Mon Sep 17 00:00:00 2001
+From: Yousong Zhou <yszhou4tech@gmail.com>
+Date: Fri, 18 Oct 2019 12:43:22 +0000
+Subject: [PATCH] skip manpages
+
+---
+ CMakeLists.txt | 55 --------------------------------------------------
+ 1 file changed, 55 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 55b93f14..acf1a904 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -2397,61 +2397,6 @@ if(NOT MSVC)
+     configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpcap.pc.in ${CMAKE_CURRENT_BINARY_DIR}/libpcap.pc @ONLY)
+     install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/pcap-config DESTINATION bin)
+     install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpcap.pc DESTINATION lib/pkgconfig)
+-
+-    #
+-    # Man pages.
+-    #
+-    # For each section of the manual for which we have man pages
+-    # that require macro expansion, do the expansion.
+-    #
+-    set(MAN1 "")
+-    foreach(MANPAGE ${MAN1_NOEXPAND})
+-        set(MAN1 ${MAN1} ${CMAKE_CURRENT_SOURCE_DIR}/${MANPAGE})
+-    endforeach(MANPAGE)
+-    install(FILES ${MAN1} DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
+-
+-    set(MAN3PCAP "")
+-    foreach(MANPAGE ${MAN3PCAP_NOEXPAND})
+-        set(MAN3PCAP ${MAN3PCAP} ${CMAKE_CURRENT_SOURCE_DIR}/${MANPAGE})
+-    endforeach(MANPAGE)
+-    foreach(TEMPLATE_MANPAGE ${MAN3PCAP_EXPAND})
+-        string(REPLACE ".in" "" MANPAGE ${TEMPLATE_MANPAGE})
+-        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/${TEMPLATE_MANPAGE} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE} @ONLY)
+-        set(MAN3PCAP ${MAN3PCAP} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE})
+-    endforeach(TEMPLATE_MANPAGE)
+-    install(FILES ${MAN3PCAP} DESTINATION ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_datalink_val_to_name.3pcap pcap_datalink_val_to_description.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_dump_open.3pcap pcap_dump_fopen.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_findalldevs.3pcap pcap_freealldevs.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_geterr.3pcap pcap_perror.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_inject.3pcap pcap_sendpacket.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_list_datalinks.3pcap pcap_free_datalinks.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_list_tstamp_types.3pcap pcap_free_tstamp_types.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_loop.3pcap pcap_dispatch.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_major_version.3pcap pcap_minor_version.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_next_ex.3pcap pcap_next.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_open_dead.3pcap pcap_open_dead_with_tstamp_precision.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_open_offline.3pcap pcap_open_offline_with_tstamp_precision.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_open_offline.3pcap pcap_fopen_offline.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_open_offline.3pcap pcap_fopen_offline_with_tstamp_precision.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_tstamp_type_val_to_name.3pcap pcap_tstamp_type_val_to_description.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-    install_manpage_symlink(pcap_setnonblock.3pcap pcap_getnonblock.3pcap ${CMAKE_INSTALL_MANDIR}/man3)
+-
+-    set(MANFILE "")
+-    foreach(TEMPLATE_MANPAGE ${MANFILE_EXPAND})
+-        string(REPLACE ".manfile.in" ".${MAN_FILE_FORMATS}" MANPAGE ${TEMPLATE_MANPAGE})
+-        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/${TEMPLATE_MANPAGE} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE} @ONLY)
+-        set(MANFILE ${MANFILE} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE})
+-    endforeach(TEMPLATE_MANPAGE)
+-    install(FILES ${MANFILE} DESTINATION ${CMAKE_INSTALL_MANDIR}/man${MAN_FILE_FORMATS})
+-
+-    set(MANMISC "")
+-    foreach(TEMPLATE_MANPAGE ${MANMISC_EXPAND})
+-        string(REPLACE ".manmisc.in" ".${MAN_MISC_INFO}" MANPAGE ${TEMPLATE_MANPAGE})
+-        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/${TEMPLATE_MANPAGE} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE} @ONLY)
+-        set(MANMISC ${MANMISC} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE})
+-    endforeach(TEMPLATE_MANPAGE)
+-    install(FILES ${MANMISC} DESTINATION ${CMAKE_INSTALL_MANDIR}/man${MAN_MISC_INFO})
+ endif(NOT MSVC)
+ 
+ # uninstall target