Treat all targets serially at the toplevel. This allows

to specify
  nice gmake --jobs all check
and go to lunch, while a multiprocessor machine
will build everything using spare resources
and check the result thereafter.
Since concurrency of make is not restricted
in subdirectories, this should be a nearly
optimal way to do it.

Also teach the user about a configure switch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47715 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/Makefile b/Makefile
index d9786d2ac051cdd61f25df5115684557a4d5e254..837c2d7222847470a6eb120ba7be97a3d61119d6 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -113,7 +113,8 @@ all::
 ifeq ($(BuildMode),Debug)
        $(Echo) '*****' Note: Debug build can be 10 times slower than an
        $(Echo) '*****' optimized build. Use 'make ENABLE_OPTIMIZED=1' to
-       $(Echo) '*****' make an optimized build.
+       $(Echo) '*****' make an optimized build. Alternatively you can
+       $(Echo) '*****' configure with --enable-optimized.
 endif
 
 check-llvm2cpp:
@@ -143,3 +144,7 @@ build-for-llvm-top:
 
 .PHONY: srpm rpm
 
+# declare all targets at this level to be serial:
+
+.NOTPARALLEL:
+