[Feature Request] Improve visibility of error relative to missing pkg-config tool

[jim-bcom]

PROBLEM

• from a fresh environment, install remaken (brew install remaken)
• run init and profile commands
• be sure to not have pkg-config installed
• run qmake on a project with remaken deps that require the use of pkg-config (spdglog, xpcf,...).

The problem is that the command seems to have run without error.

When make is invoked to compile the project, the library's header files (e.g. xpcf) are not found, and this library is nowhere to be found on the compiler command line.

When looking more closely at the qmake command logs, we can see indications that something went wrong:

• pkg-config is not found:

 Project MESSAGE: ---- Processing spdlog 0.14.0 package ----
/bin/sh: 1: pkg-config: not found
/bin/sh: 1: pkg-config: not found

• include dirs are empty:

Project MESSAGE: ----------------------------------------------------------------
Project MESSAGE: ---- Global processing result 
Project MESSAGE:   --> [INFO] QMAKE_CXXFLAGS : 
Project MESSAGE:   -pipe
Project MESSAGE:   --> [INFO] INCLUDEPATH : 
Project MESSAGE:   
Project MESSAGE:   --> [INFO] LIBS : 
Project MESSAGE: 

Although, the sh error is explanatory, time can be lost looking for what actually happened.

SUGGESTED SOLUTION

• Handle the sh error,stop execution of qmake command and give an error message and instructions on how to resolve the issue (i.e. install pkg-config).
• (Add a kind of brew doctor command to remaken to make some checks about the environement. But maybe here it's not relevant, becausepkg-config is maybe not needed if the project only uses conan dependencies, for example, right?)

CONFIGURATION
OS: Ubuntu-22.04
remaken: 1.9.4
builddefs-qmake: 4.9.5

[stefled]

A fix has been added :
Qmake returns an error when pkg-config is needed but not found

will be available in a next release