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

6 files changed, 38 insertions, 1 deletions

diff --git a/test cases/common/13 pch/c/meson.build b/test cases/common/13 pch/c/meson.build
index fe4ac68..6fba15b 100644
--- a/test cases/common/13 pch/c/meson.build
+++ b/test cases/common/13 pch/c/meson.build
@@ -1,8 +1,14 @@
 cc = meson.get_compiler('c')
 cc_id = cc.get_id()
+
 if cc_id == 'lcc'
   error('MESON_SKIP_TEST: Elbrus compiler does not support PCH.')
 endif
 
+# PGI compiler only supports PCH for C++
+if cc_id == 'pgi'
+  subdir_done()
+endif
+
 exe = executable('prog', 'prog.c',
 c_pch : 'pch/prog.h')
diff --git a/test cases/common/13 pch/cpp/prog.cc b/test cases/common/13 pch/cpp/prog.cc
index 629d880..ea258c6 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;
 }
diff --git a/test cases/common/13 pch/generated/meson.build b/test cases/common/13 pch/generated/meson.build
index 1ef771b..ba06bce 100644
--- a/test cases/common/13 pch/generated/meson.build
+++ b/test cases/common/13 pch/generated/meson.build
@@ -1,9 +1,15 @@
 cc = meson.get_compiler('c')
 cc_id = cc.get_id()
+
 if cc_id == 'lcc'
   error('MESON_SKIP_TEST: Elbrus compiler does not support PCH.')
 endif
 
+# PGI compiler only supports PCH for C++
+if cc_id == 'pgi'
+  subdir_done()
+endif
+
 generated_customTarget = custom_target('makeheader',
   output: 'generated_customTarget.h',
   command : [find_program('gen_custom.py'), '@OUTPUT0@'])
diff --git a/test cases/common/13 pch/meson.build b/test cases/common/13 pch/meson.build
index 4438c9e..334afc5 100644
--- a/test cases/common/13 pch/meson.build
+++ b/test cases/common/13 pch/meson.build
@@ -1,4 +1,12 @@
-project('pch test', 'c', 'cpp')
+project('pch test', 'c', 'cpp',
+  meson_version: '>= 0.46.0')
+
+cc = meson.get_compiler('c')
+cc_id = cc.get_id()
+
+if cc_id == 'pgi'
+  error('MESON_SKIP_TEST: PGI compiler does support PCH, however, PGI cannot tolerate spaces in the --pch_dir path and Meson run_project_tests.py uses spaces in temporary build path names. If this test is run individually with no spaces in build path, it will pass.')
+endif
 
 subdir('c')
 subdir('cpp')
diff --git a/test cases/common/13 pch/mixed/meson.build b/test cases/common/13 pch/mixed/meson.build
index cbb7bac..266e7a5 100644
--- a/test cases/common/13 pch/mixed/meson.build
+++ b/test cases/common/13 pch/mixed/meson.build
@@ -1,3 +1,11 @@
+cc = meson.get_compiler('c')
+cc_id = cc.get_id()
+
+# PGI compiler only supports PCH for C++
+if cc_id == 'pgi'
+  subdir_done()
+endif
+
 exe = executable(
   'prog',
   files('main.cc', 'func.c'),
diff --git a/test cases/common/13 pch/withIncludeDirectories/meson.build b/test cases/common/13 pch/withIncludeDirectories/meson.build
index 68e544b..95f7888 100644
--- a/test cases/common/13 pch/withIncludeDirectories/meson.build
+++ b/test cases/common/13 pch/withIncludeDirectories/meson.build
@@ -1,9 +1,15 @@
 cc = meson.get_compiler('c')
 cc_id = cc.get_id()
+
 if cc_id == 'lcc'
   error('MESON_SKIP_TEST: Elbrus compiler does not support PCH.')
 endif
 
+# PGI compiler only supports PCH for C++
+if cc_id == 'pgi'
+  subdir_done()
+endif
+
 exe = executable('prog', 'prog.c',
   include_directories: 'include',
   c_pch : 'pch/prog.h')