qtcreator: Take over '-std=...' from CXXFLAGS

If the '-std=' compiler flag is set in CXXFLAGS,
take that over into the .pro files used by
Qt Creator.

This makes ClangCodeModel use the correct std version,
and e.g. know about 'std::string_view' if '-std=gnu++2a'
(or anything else indicating C++17 or higher is supported)
is used and thus avoids unnecessary errors/warnings from
being displayed.

Use a list, so other flags can easily be added later.
(It currently doesn't seem reasonable to me to just pass all
cxxflags though, since .pro files are currently only generated
per top-level module, while C++ flags can differ between
different targets in the same module).

Change-Id: Id3f3e2b9ba77e5220a17fd4796937c816979959a
Reviewed-on: https://gerrit.libreoffice.org/73677
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

1 files changed, 14 insertions, 1 deletions

diff --git a/bin/gbuild-to-ide b/bin/gbuild-to-ide
index 1365c548c218..e012c08c0828 100755
--- a/bin/gbuild-to-ide
+++ b/bin/gbuild-to-ide
@@ -1671,6 +1671,12 @@ class QtCreatorIntegrationGenerator(IdeIntegrationGenerator):
                 if ext:
                     headers_list.append(lopath(file_ + ext))
 
+            cxxflags_list = []
+            for cxxflag in lib.cxxflags:
+                # extract flag for C++ standard version
+                if cxxflag.startswith('-std'):
+                    cxxflags_list.append(cxxflag)
+
             # List all include paths
             for hdir in (lib.include + lib.include_sys):
                 hf_lopath = lopath(hdir)
@@ -1695,12 +1701,14 @@ class QtCreatorIntegrationGenerator(IdeIntegrationGenerator):
             if lib_folder in self.data_libs:
                 self.data_libs[lib_folder]['sources'] |= set(sources_list)
                 self.data_libs[lib_folder]['headers'] |= set(headers_list)
+                self.data_libs[lib_folder]['cxxflags'] |= set(cxxflags_list)
                 self.data_libs[lib_folder]['includepath'] |= set(includepath_list)
                 self.data_libs[lib_folder]['defines'] |= set(defines_list)
             else:
                 self.data_libs[lib_folder] = {
                     'sources': set(sources_list),
                     'headers': set(headers_list),
+                    'cxxflags': set(cxxflags_list),
                     'includepath': set(includepath_list),
                     'defines': set(defines_list),
                     'loc': lib.location,
@@ -1723,6 +1731,7 @@ class QtCreatorIntegrationGenerator(IdeIntegrationGenerator):
         for lib_folder in subdirs_list:
             sources_list = sorted(self.data_libs[lib_folder]['sources'])
             headers_list = sorted(self.data_libs[lib_folder]['headers'])
+            cxxflags_list = sorted(self.data_libs[lib_folder]['cxxflags'])
             includepath_list = sorted(self.data_libs[lib_folder]['includepath'])
             defines_list = sorted(self.data_libs[lib_folder]['defines'])
             lib_loc = self.data_libs[lib_folder]['loc']
@@ -1730,13 +1739,15 @@ class QtCreatorIntegrationGenerator(IdeIntegrationGenerator):
 
             sources = " \\\n".join(sources_list)
             headers = " \\\n".join(headers_list)
+            cxxflags = " \\\n".join(cxxflags_list)
             includepath = " \\\n".join(includepath_list)
             defines = " \\\n".join(defines_list)
 
             # create .pro file
             qt_pro_file = '%s/%s.pro' % (lib_loc, lib_name)
             try:
-                content = QtCreatorIntegrationGenerator.pro_template % {'sources': sources, 'headers': headers, 'includepath': includepath, 'defines': defines}
+                content = QtCreatorIntegrationGenerator.pro_template % {'sources': sources, 'headers': headers,
+                                                                        'cxxflags': cxxflags, 'includepath': includepath, 'defines': defines}
                 mode = 'w+'
                 with open(qt_pro_file, mode) as fpro:
                     fpro.write(content)
@@ -1799,6 +1810,8 @@ CONFIG += console
 CONFIG -= app_bundle
 CONFIG -= qt
 
+QMAKE_CXXFLAGS += %(cxxflags)s
+
 INCLUDEPATH += %(includepath)s
 
 SOURCES += %(sources)s