Set C++ 20 dialect in Conan profile

Author: bthomee

docker/debian/Dockerfile

@@ -91,6 +91,8 @@ WORKDIR /home/${NONROOT_USER}
 
 # Create a default Conan profile.
 RUN conan profile detect
+# Fix the C++ dialect.
+RUN sed -e 's|^compiler\.cppstd=.*$|compiler.cppstd=20|' ${CONAN_HOME}/profiles/default
 # Print the Conan profile to verify the configuration.
 RUN conan profile show
 
@@ -135,5 +137,7 @@ tools.build:cxxflags=['-Wno-missing-template-arg-list-after-template-kw']
 EOT
 fi
 EOF
+# Fix the C++ dialect.
+RUN sed -e 's|^compiler\.cppstd=.*$|compiler.cppstd=20|' ${CONAN_HOME}/profiles/default
 # Print the Conan profile to verify the configuration.
 RUN conan profile show

docker/rhel/Dockerfile

@@ -51,6 +51,8 @@ ENV CONAN_HOME=/home/${NONROOT_USER}/.conan2
 
 # Create a default Conan profile.
 RUN conan profile detect
+# Fix the C++ dialect.
+RUN sed -e 's|^compiler\.cppstd=.*$|compiler.cppstd=20|' ${CONAN_HOME}/profiles/default
 # Print the Conan profile to verify the configuration.
 RUN conan profile show
 
@@ -87,5 +89,7 @@ tools.build:cxxflags=['-Wno-missing-template-arg-list-after-template-kw']
 EOT
 fi
 EOF
+# Fix the C++ dialect.
+RUN sed -e 's|^compiler\.cppstd=.*$|compiler.cppstd=20|' ${CONAN_HOME}/profiles/default
 # Print the Conan profile to verify the configuration.
 RUN conan profile show

docker/ubuntu/Dockerfile

@@ -63,6 +63,8 @@ WORKDIR /home/${NONROOT_USER}
 
 # Create a default Conan profile.
 RUN conan profile detect
+# Fix the C++ dialect.
+RUN sed -e 's|^compiler\.cppstd=.*$|compiler.cppstd=20|' ${CONAN_HOME}/profiles/default
 # Print the Conan profile to verify the configuration.
 RUN conan profile show
 
@@ -98,5 +100,7 @@ tools.build:cxxflags=['-Wno-missing-template-arg-list-after-template-kw']
 EOT
 fi
 EOF
+# Fix the C++ dialect.
+RUN sed -e 's|^compiler\.cppstd=.*$|compiler.cppstd=20|' ${CONAN_HOME}/profiles/default
 # Print the Conan profile to verify the configuration.
 RUN conan profile show