Error note for qmake prolactin TEMPLATE = subdir

Recently, an error occurred while using qmake, prolactin, and TEMPLATE = subdir. Record for later viewing.

Project Structure:

 

 
 

  
  
project.pro 
  
  
main\ 
  
  
    \__ main.pro 
  
  
lib\ 
  
  
    \__ lib.pro 
 
 

Project. pro:

 
 

  
  
TEMPLATE  = subdirs 
  
  
SUBDIRS = main lib 
  
  
main.depends = lib
 
 

In main. pro, there is a sentence:

 

 
 

  
  
CONFIG += link_prl 
 
 

Lib. pro has the following sentence:

 

 
 

  
  
CONFIG += create_prl 
 
 

The error is:

1. lib files and dynamic libraries are generated successfully.

2. The main project does not read the content in the top 5.

 

At first, I thought it was the issue of ld during the connection period. After practice, I ruled out this possibility.

Finally, I found something strange in Makefile. Is the Makefile file corresponding to project. pro:

 

 
 

  
  
sub-main: main/$(MAKEFILE) sub-lib 
  
  
    cd main/ && $(MAKE) -f $(MAKEFILE) 
 
 

That is to say,

Fact 1: main first generates its own Makefile from main. pro, and then make sub-lib target.

At the same time, we know that

Fact 2: prolactin is read in the qmake stage.

Therefore, we can conclude that:

Inference 1: when the main qmake is executed, the library object's top 5 files and dynamic library files are not yet generated. This will inevitably cause the main to be unable to read the library generated by lib.

In fact, the final solution is helpless. In the project. pro, the order of main and lib is reversed and then compiled. Everything is normal.

This article is from the "elephant_liu" blog, please be sure to keep this source http://elephantliu.blog.51cto.com/1107116/835870