build system: drop PLATFORM_LINUX

PLATFORM_LINUX is a hidden configuration option which is disabled by
default and enabled at over a hundred locations for features that are
deemed to be Linux specific.

The only effect of PLATFORM_LINUX is to control compilation of
libbb/match_fstype.c.  This file is only needed by mount and umount.

Remove all references to PLATFORM_LINUX and compile match_fstype.c
if mount or umount is enabled.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 2 insertions, 3 deletions

diff --git a/libbb/Config.src b/libbb/Config.src
index 312aa1831..f97de8ef7 100644
--- a/libbb/Config.src
+++ b/libbb/Config.src
@@ -334,7 +334,6 @@ config FEATURE_VERBOSE_CP_MESSAGE
 config FEATURE_USE_SENDFILE
         bool "Use sendfile system call"
         default y
-        select PLATFORM_LINUX
         help
         When enabled, busybox will use the kernel sendfile() function
         instead of read/write loops to copy data between file descriptors
@@ -376,7 +375,6 @@ config FEATURE_SKIP_ROOTFS
 config MONOTONIC_SYSCALL
         bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
         default y
-        select PLATFORM_LINUX
         help
         Use clock_gettime(CLOCK_MONOTONIC) syscall for measuring
         time intervals (time, ping, traceroute etc need this).
diff --git a/libbb/Kbuild.src b/libbb/Kbuild.src
index 8c9ba8cca..676300801 100644
--- a/libbb/Kbuild.src
+++ b/libbb/Kbuild.src
@@ -112,7 +112,8 @@ lib-y += xgethostbyname.o
 lib-y += xreadlink.o
 lib-y += xrealloc_vector.o
 
-lib-$(CONFIG_PLATFORM_LINUX) += match_fstype.o
+lib-$(CONFIG_MOUNT) += match_fstype.o
+lib-$(CONFIG_UMOUNT) += match_fstype.o
 
 lib-$(CONFIG_FEATURE_UTMP) += utmp.o