docs: bump minimal GNU Make version to 3.81

Since 2014, you can't successfully build kernels with GNU Make version
3.80. Example errors:

  $ git describe
  v4.11
  $ make --version | head -1
  GNU Make 3.80
  $ make defconfig
    HOSTCC  scripts/basic/fixdep
  scripts/Makefile.host:135: *** missing separator.  Stop.
  make: *** [defconfig] Error 2
  $ make ARCH=arm64 help
  arch/arm64/Makefile:43: *** unterminated call to function `warning': missing `)'.  Stop.
  $ make help >/dev/null
  ./Documentation/Makefile.sphinx:25: Extraneous text after `else' directive
  ./Documentation/Makefile.sphinx:31: *** only one `else' per conditional.  Stop.
  make: *** [help] Error 2

The first breakage was introduced by commit c8589d1e9e ("kbuild:
handle multi-objs dependency appropriately").  Since then (i.e. v3.18),
GNU Make 3.80 has not been able to compile the kernel, but nobody has
ever complained aboutt (or noticed) it.

Even GNU Make 3.81 is more than 10 years old.  It would not hurt to
match the documentation with reality instead of fixing makefiles.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Masahiro Yamada 2017-05-07 00:39:17 +09:00 коммит произвёл Linus Torvalds
Родитель 394e4f5d58
Коммит 37d69ee308
1 изменённых файлов: 1 добавлений и 1 удалений

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@ -30,7 +30,7 @@ you probably needn't concern yourself with isdn4k-utils.
Program Minimal version Command to check the version
====================== =============== ========================================
GNU C 3.2 gcc --version
GNU make 3.80 make --version
GNU make 3.81 make --version
binutils 2.12 ld -v
util-linux 2.10o fdformat --version
module-init-tools 0.9.10 depmod -V