Fix non-Linux builds

Various tools are Linuxish and should thus only attempted to build on
Linux only. Some features are also Linux-only.

Also, libresolv is used on all GNU platforms, notably GNU/Hurd and
GNU/kfreeBSD.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

24 files changed, 28 insertions, 0 deletions

diff --git a/util-linux/acpid.c b/util-linux/acpid.c
index 00613f8..7bce8ab 100644
--- a/util-linux/acpid.c
+++ b/util-linux/acpid.c
@@ -9,6 +9,7 @@
 //config:config ACPID
 //config:	bool "acpid (9 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	acpid listens to ACPI events coming either in textual form from
 //config:	/proc/acpi/event (though it is marked deprecated it is still widely
diff --git a/util-linux/blkdiscard.c b/util-linux/blkdiscard.c
index 7ac8045..2291eec 100644
--- a/util-linux/blkdiscard.c
+++ b/util-linux/blkdiscard.c
@@ -8,6 +8,7 @@
 //config:config BLKDISCARD
 //config:	bool "blkdiscard (4.3 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	blkdiscard discards sectors on a given device.
 
diff --git a/util-linux/blkid.c b/util-linux/blkid.c
index 4a82077..008ae5d 100644
--- a/util-linux/blkid.c
+++ b/util-linux/blkid.c
@@ -9,6 +9,7 @@
 //config:config BLKID
 //config:	bool "blkid (12 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	select VOLUMEID
 //config:	help
 //config:	Lists labels and UUIDs of all filesystems.
diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index 6670b84..5da887f 100644
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -11,6 +11,7 @@
 //config:config DMESG
 //config:	bool "dmesg (3.7 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	dmesg is used to examine or control the kernel ring buffer. When the
 //config:	Linux kernel prints messages to the system log, they are stored in
diff --git a/util-linux/fdisk.c b/util-linux/fdisk.c
index 20e7d56..e9ebbd5 100644
--- a/util-linux/fdisk.c
+++ b/util-linux/fdisk.c
@@ -10,6 +10,7 @@
 //config:config FDISK
 //config:	bool "fdisk (37 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	The fdisk utility is used to divide hard disks into one or more
 //config:	logical disks, which are generally called partitions. This utility
diff --git a/util-linux/findfs.c b/util-linux/findfs.c
index f5621a1..7ca9dc9 100644
--- a/util-linux/findfs.c
+++ b/util-linux/findfs.c
@@ -10,6 +10,7 @@
 //config:config FINDFS
 //config:	bool "findfs (12 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	select VOLUMEID
 //config:	help
 //config:	Prints the name of a filesystem with given label or UUID.
diff --git a/util-linux/freeramdisk.c b/util-linux/freeramdisk.c
index 309169d..d27113d 100644
--- a/util-linux/freeramdisk.c
+++ b/util-linux/freeramdisk.c
@@ -11,6 +11,7 @@
 //config:config FDFLUSH
 //config:	bool "fdflush (1.3 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	fdflush is only needed when changing media on slightly-broken
 //config:	removable media drives. It is used to make Linux believe that a
@@ -23,6 +24,7 @@
 //config:config FREERAMDISK
 //config:	bool "freeramdisk (1.3 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Linux allows you to create ramdisks. This utility allows you to
 //config:	delete them and completely free all memory that was used for the
diff --git a/util-linux/fsfreeze.c b/util-linux/fsfreeze.c
index 6e2ff0a..fb0b3c4 100644
--- a/util-linux/fsfreeze.c
+++ b/util-linux/fsfreeze.c
@@ -7,6 +7,7 @@
 //config:config FSFREEZE
 //config:	bool "fsfreeze (3.5 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	select LONG_OPTS
 //config:	help
 //config:	Halt new accesses and flush writes on a mounted filesystem.
diff --git a/util-linux/fstrim.c b/util-linux/fstrim.c
index 6d67300..12bab40 100644
--- a/util-linux/fstrim.c
+++ b/util-linux/fstrim.c
@@ -10,6 +10,7 @@
 //config:config FSTRIM
 //config:	bool "fstrim (4.4 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Discard unused blocks on a mounted filesystem.
 
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index 723b095..2edadfa 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -9,6 +9,7 @@
 //config:config HWCLOCK
 //config:	bool "hwclock (5.8 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	The hwclock utility is used to read and set the hardware clock
 //config:	on a system. This is primarily used to set the current time on
diff --git a/util-linux/ionice.c b/util-linux/ionice.c
index 82bd309..b30d5f7 100644
--- a/util-linux/ionice.c
+++ b/util-linux/ionice.c
@@ -9,6 +9,7 @@
 //config:config IONICE
 //config:	bool "ionice (3.8 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Set/set program io scheduling class and priority
 //config:	Requires kernel >= 2.6.13
diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index 24f7a23..ec0cf04 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -9,6 +9,7 @@
 //config:config LOSETUP
 //config:	bool "losetup (5.5 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	losetup is used to associate or detach a loop device with a regular
 //config:	file or block device, and to query the status of a loop device. This
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index ebdc0c2..f6de7ad 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -10,6 +10,7 @@
 //config:config MDEV
 //config:	bool "mdev (17 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	mdev is a mini-udev implementation for dynamically creating device
 //config:	nodes in the /dev directory.
diff --git a/util-linux/mkfs_ext2.c b/util-linux/mkfs_ext2.c
index fcf374b..892b086 100644
--- a/util-linux/mkfs_ext2.c
+++ b/util-linux/mkfs_ext2.c
@@ -10,6 +10,7 @@
 //config:config MKE2FS
 //config:	bool "mke2fs (10 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Utility to create EXT2 filesystems.
 //config:
diff --git a/util-linux/mkfs_vfat.c b/util-linux/mkfs_vfat.c
index 8213719..5136446 100644
--- a/util-linux/mkfs_vfat.c
+++ b/util-linux/mkfs_vfat.c
@@ -10,6 +10,7 @@
 //config:config MKDOSFS
 //config:	bool "mkdosfs (7.2 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Utility to create FAT32 filesystems.
 //config:
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 4e65b6b..e3aeda6 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -20,6 +20,7 @@
 //config:config MOUNT
 //config:	bool "mount (23 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	All files and filesystems in Unix are arranged into one big directory
 //config:	tree. The 'mount' utility is used to graft a filesystem onto a
diff --git a/util-linux/nsenter.c b/util-linux/nsenter.c
index 1aa045b..8652e80 100644
--- a/util-linux/nsenter.c
+++ b/util-linux/nsenter.c
@@ -9,6 +9,7 @@
 //config:config NSENTER
 //config:	bool "nsenter (6.5 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Run program with namespaces of other processes.
 
diff --git a/util-linux/pivot_root.c b/util-linux/pivot_root.c
index ecc8911..41f29da 100644
--- a/util-linux/pivot_root.c
+++ b/util-linux/pivot_root.c
@@ -11,6 +11,7 @@
 //config:config PIVOT_ROOT
 //config:	bool "pivot_root (1.1 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	The pivot_root utility swaps the mount points for the root filesystem
 //config:	with some other mounted filesystem. This allows you to do all sorts
diff --git a/util-linux/setarch.c b/util-linux/setarch.c
index cf8ef00..57051a6 100644
--- a/util-linux/setarch.c
+++ b/util-linux/setarch.c
@@ -9,6 +9,7 @@
 //config:config SETARCH
 //config:	bool "setarch (3.6 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	The linux32 utility is used to create a 32bit environment for the
 //config:	specified program (usually a shell). It only makes sense to have
@@ -18,12 +19,14 @@
 //config:config LINUX32
 //config:	bool "linux32 (3.3 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Alias to "setarch linux32".
 //config:
 //config:config LINUX64
 //config:	bool "linux64 (3.3 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Alias to "setarch linux64".
 
diff --git a/util-linux/setpriv.c b/util-linux/setpriv.c
index 6904cf0..bfe2c7a 100644
--- a/util-linux/setpriv.c
+++ b/util-linux/setpriv.c
@@ -9,6 +9,7 @@
 //config:config SETPRIV
 //config:	bool "setpriv (6.6 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	select LONG_OPTS
 //config:	help
 //config:	Run a program with different Linux privilege settings.
diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index e2ff4b5..567869c 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -9,6 +9,7 @@
 //config:config SWAPON
 //config:	bool "swapon (15 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	Once you have created some swap space using 'mkswap', you also need
 //config:	to enable your swap space with the 'swapon' utility. The 'swapoff'
@@ -35,6 +36,7 @@
 //config:config SWAPOFF
 //config:	bool "swapoff (14 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:
 //config:config FEATURE_SWAPONOFF_LABEL
 //config:	bool "Support specifying devices by label or UUID"
diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index 901c0b8..f610022 100644
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -9,6 +9,7 @@
 //config:config SWITCH_ROOT
 //config:	bool "switch_root (5.5 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	The switch_root utility is used from initramfs to select a new
 //config:	root device. Under initramfs, you have to use this instead of
diff --git a/util-linux/uevent.c b/util-linux/uevent.c
index db11746..bd39c3a 100644
--- a/util-linux/uevent.c
+++ b/util-linux/uevent.c
@@ -6,6 +6,7 @@
 //config:config UEVENT
 //config:	bool "uevent (3.1 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	help
 //config:	uevent is a netlink listener for kernel uevent notifications
 //config:	sent via netlink. It is usually used for dynamic device creation.
diff --git a/util-linux/unshare.c b/util-linux/unshare.c
index 06b9380..156a96d 100644
--- a/util-linux/unshare.c
+++ b/util-linux/unshare.c
@@ -9,6 +9,7 @@
 //config:config UNSHARE
 //config:	bool "unshare (7.2 kb)"
 //config:	default y
+//config:	select PLATFORM_LINUX
 //config:	depends on !NOMMU
 //config:	select LONG_OPTS
 //config:	help