Toolchains: Add C++98 as a language standard.

This was curiously missing from the CompilerFlag enum, so e.g. setting
"QMAKE_CXXFLAGS += -std=c++98" in a .pro file did not have the desired
effect on higher-level code such as the code model.

Change-Id: Ia4323b699a2ccea9d3cbde10b05affe87d955277
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/plugins/projectexplorer/gcctoolchain.cpp b/src/plugins/projectexplorer/gcctoolchain.cpp
index 320bf86976..1ad40a8702 100644
--- a/src/plugins/projectexplorer/gcctoolchain.cpp
+++ b/src/plugins/projectexplorer/gcctoolchain.cpp
@@ -448,6 +448,7 @@ ToolChain::CompilerFlags GccToolChain::compilerFlags(const QStringList &cxxflags
             const QByteArray std = flag.mid(5).toLatin1();
             if (std == "c++98" || std == "c++03") {
                 flags &= ~CompilerFlags(StandardCxx11 | StandardCxx14 | StandardCxx17 | GnuExtensions);
+                flags |= StandardCxx98;
             } else if (std == "gnu++98" || std == "gnu++03") {
                 flags &= ~CompilerFlags(StandardCxx11 | StandardCxx14 | StandardCxx17);
                 flags |= GnuExtensions;