Aboriginal linux/musl build fixes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

Config.in

@@ -514,6 +514,14 @@ config PIE
 
 	  Most people will leave this set to 'N'.
 
+config LINK_WITH_PTHREAD
+	bool "Link with pthread library"
+	default n
+	help
+	  On some systems, some libraries (such as crypt) also require pthread.
+
+	  Select this only if your build otherwise fails.
+
 config NOMMU
 	bool "Force NOMMU build"
 	default n

Makefile.flags

@@ -126,10 +126,12 @@ else
 LDLIBS += m
 endif
 
+ifeq ($(CONFIG_LINK_WITH_PTHREAD),y)
 PTHREAD_AVAILABLE := $(shell echo 'int main(void){return 0;}' >pthreadtest.c; $(CC) $(CFLAGS) -lpthread -o /dev/null pthreadtest.c >/dev/null 2>&1 && echo "y"; rm pthreadtest.c)
 ifeq ($(PTHREAD_AVAILABLE),y)
 LDLIBS += pthread
 endif
+endif
 
 ifeq ($(CONFIG_PAM),y)
 # libpam uses libpthread, libdl and libaudit, so for static builds busybox

applets/usage_compressed

@@ -20,6 +20,7 @@ exec >"$target.$$"
 
 echo '#define UNPACKED_USAGE "" \'
 "$loc/usage" | od -v -b \
+| grep -v '^ ' \
 | $SED -e 's/^[^ ]*//' \
 	-e 's/ //g' \
 	-e '/^$/d' \
@@ -27,6 +28,13 @@ echo '#define UNPACKED_USAGE "" \'
 	-e 's/^/"/' \
 	-e 's/$/" \\/'
 echo ''
+# "grep -v '^ '" is for toybox's od bug: od -b prints some extra lines:
+#0000000 010 000 010 000 133 055 144 146 135 040 133 055 143 040 103 117
+#         000010 000010 026533 063144 020135 026533 020143 047503
+#0000020 116 106 104 111 122 135 040 133 055 154 040 114 117 107 106 111
+#         043116 044504 056522 055440 066055 046040 043517 044506
+#0000040 114 105 135 040 133 055 141 040 101 103 124 111 117 116 106 111
+#         042514 020135 026533 020141 041501 044524 047117 044506
 
 echo '#define PACKED_USAGE \'
 ## Breaks on big-endian systems!
@@ -40,6 +48,7 @@ echo '#define PACKED_USAGE \'
 ##	-e 's/\(..\)\(..\)/0x\2,0x\1,/g'
 ##	-e 's/$/ \\/'
 "$loc/usage" | bzip2 -1 | $DD bs=2 skip=1 2>/dev/null | od -v -b \
+| grep -v '^ ' \
 | $SED -e 's/^[^ ]*//' \
 	-e 's/ //g' \
 	-e '/^$/d' \

networking/brctl.c

@@ -64,7 +64,57 @@
 #define BRCTL_USE_INTERNAL 1
 
 #if ENABLE_FEATURE_BRCTL_FANCY
-# include <linux/if_bridge.h>
+/* #include <linux/if_bridge.h>
+ * breaks on musl: we already included netinet/in.h in libbb.h,
+ * if we include <linux/if_bridge.h> here, we get this:
+ * In file included from /usr/include/linux/if_bridge.h:18,
+ *                  from networking/brctl.c:67:
+ * /usr/include/linux/in6.h:32: error: redefinition of 'struct in6_addr'
+ * /usr/include/linux/in6.h:49: error: redefinition of 'struct sockaddr_in6'
+ * /usr/include/linux/in6.h:59: error: redefinition of 'struct ipv6_mreq'
+ */
+/* From <linux/if_bridge.h> */
+#define BRCTL_GET_VERSION 0
+#define BRCTL_GET_BRIDGES 1
+#define BRCTL_ADD_BRIDGE 2
+#define BRCTL_DEL_BRIDGE 3
+#define BRCTL_ADD_IF 4
+#define BRCTL_DEL_IF 5
+#define BRCTL_GET_BRIDGE_INFO 6
+#define BRCTL_GET_PORT_LIST 7
+#define BRCTL_SET_BRIDGE_FORWARD_DELAY 8
+#define BRCTL_SET_BRIDGE_HELLO_TIME 9
+#define BRCTL_SET_BRIDGE_MAX_AGE 10
+#define BRCTL_SET_AGEING_TIME 11
+#define BRCTL_SET_GC_INTERVAL 12
+#define BRCTL_GET_PORT_INFO 13
+#define BRCTL_SET_BRIDGE_STP_STATE 14
+#define BRCTL_SET_BRIDGE_PRIORITY 15
+#define BRCTL_SET_PORT_PRIORITY 16
+#define BRCTL_SET_PATH_COST 17
+#define BRCTL_GET_FDB_ENTRIES 18
+struct __bridge_info {
+	uint64_t designated_root;
+	uint64_t bridge_id;
+	uint32_t root_path_cost;
+	uint32_t max_age;
+	uint32_t hello_time;
+	uint32_t forward_delay;
+	uint32_t bridge_max_age;
+	uint32_t bridge_hello_time;
+	uint32_t bridge_forward_delay;
+	uint8_t  topology_change;
+	uint8_t  topology_change_detected;
+	uint8_t  root_port;
+	uint8_t  stp_enabled;
+	uint32_t ageing_time;
+	uint32_t gc_interval;
+	uint32_t hello_timer_value;
+	uint32_t tcn_timer_value;
+	uint32_t topology_change_timer_value;
+	uint32_t gc_timer_value;
+};
+/* end <linux/if_bridge.h> */
 
 /* FIXME: These 4 funcs are not really clean and could be improved */
 static ALWAYS_INLINE void bb_strtotimeval(struct timeval *tv,

networking/ifplugd.c

@@ -38,7 +38,17 @@
 #include <linux/mii.h>
 #include <linux/ethtool.h>
 #ifdef HAVE_NET_ETHERNET_H
-# include <net/ethernet.h>
+/* musl breakage:
+ * In file included from /usr/include/net/ethernet.h:10,
+ *                  from networking/ifplugd.c:41:
+ * /usr/include/netinet/if_ether.h:96: error: redefinition of 'struct ethhdr'
+ *
+ * Build succeeds without it on musl. Commented it out.
+ * If on your system you need it, consider removing <linux/ethtool.h>
+ * and copy-pasting its definitions here (<linux/ethtool.h> is what pulls in
+ * conflicting definition of struct ethhdr on musl).
+ */
+/* # include <net/ethernet.h> */
 #endif
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>