PGI: cpp_pch precompiled headers functionality

* PGI C++ PCH enable

PGI compilers support precompiled headers for C++ only.
The common/13 pch test passes if run manually with no spaces in the build path.
However, since Meson run_project_tests.py makes temporary build directories
with spaces in each tests, PGI --pch_dir can't handle this and fails.
So we skip the test for PGI despite it working for usual case with no-spaces
in build dir.
Note: it's fine to have spaces in full path for sourcedir, just no spaces in
relative path to builddir.

* doc

1 files changed, 3 insertions, 0 deletions

diff --git a/test cases/common/13 pch/cpp/prog.cc b/test cases/common/13 pch/cpp/prog.cc
index 629d88077..ea258c688 100644
--- a/test cases/common/13 pch/cpp/prog.cc
+++ b/test cases/common/13 pch/cpp/prog.cc
@@ -1,8 +1,11 @@
+// Note: if using PGI compilers, you will need to add #include "prog.hh"
+// even though you're using precompiled headers.
 void func() {
     std::cout << "This is a function that fails to compile if iostream is not included."
               << std::endl;
 }
 
 int main(int argc, char **argv) {
+    func();
     return 0;
 }