Makefile项目-通过“ -j”参数使用多个作业时防止构建失败

Question

I have a number of simple C++ Makefile projects using GNU Make style makefiles I've manually written, rather than using Automake or CMake. The most sophisticated mechanism in them is the use of pkginfo to get compile-time flags and include paths for a handful of third-party libraries.

I am able to greatly speed up my builds on my current hardware (Intel i7 quad core) via running make like, so, assuming 4 cores on the machine:

make -j5 -l4

However, some projects, which build fine when run serially (ie: j1), fail when I allow multiple jobs. These projects that fail are essentially a set of projects that are built in sequence from a "master" makefile, and certain dependencies are built out of order.

Assuming I have a list of projects like so:

library1 (all other projects depend on this)
library2 (all other projects depend on this)
library3 (some other projects depend on this)
example1
...
example20

Is there a simple/de-facto "standard" way of putting a marker/rule in place so that the master makefile builds the libraries first serially, then allows the remaining example projects to build in any which order?

Thank you.

Answer 1

Maybe I didn't understand, but why don't you artificially declare library 2 to depend on library 1 in the master makefile, and library 3 to depend on 1 and 2, etc. Then it should only be possible for them to build serially.

I don't know if there's a special makefile language or option for this, would be keen to learn.