Question about C++ files with GPRBUILD

Question about C++ files with GPRBUILD

[Zack Boll]

I have a directory with several C++ test driver.  For a test, my project file only includes one of the test drivers.  

for Languages use ("C++");
for Main use ("test_driver_1.cpp");
for Source_Dirs use (".");

when I go to compile the test driver from GPS, gprbuild tries to compile all C++ files in the directory.  Does anyone have an idea on why it does that and how I can fix it to only compile the relevant C++ file?

gprbuild -v -d -P/test_scripts/test_scripts.gpr -XADA_DIALECT=Ada_2012 -XARCHITECTURE=x86_64_Linux -XBUILD_FLAGS=Optimize -XELABORATION_CHECKS=Static -XCOMPILER_MULTIPROCESS=8 -XDEBUG_TARGET=local test_driver_1.cpp -s -j8



Thanks,
Zack

Re: Question about C++ files with GPRBUILD

[Egil H H]

On Tuesday, March 8, 2016 at 6:02:08 AM UTC+1, Zack Boll wrote:
> I have a directory with several C++ test driver.  For a test, my project file only includes one of the test drivers.  
> 
> for Languages use ("C++");
> for Main use ("test_driver_1.cpp");
> for Source_Dirs use (".");
 
for Source_Files use ("test_driver_1.cpp");

The default is all files in all Source_Dirs.

Re: Question about C++ files with GPRBUILD

[briot.emmanuel]

> The default is all files in all Source_Dirs.

Right, this is unfortunately needed for C and C++, since there is no clear way to compute the closure for a main (you could be using extern declarations for all subprograms, without ever using #include for instance). So gprbuild will build all project sources (either found automatically via Source_Dirs, or explicitly via Source_Files), build a library with these, and finally link the main unit using that library.