Request C++17 by default, add fallback flag for now

stan-dev · May 6, 2024 · 07cb7ab · 07cb7ab
1 parent ee65daa
commit 07cb7ab
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/make/compiler_flags b/make/compiler_flags
@@ -123,8 +123,12 @@ CPPFLAGS_SUNDIALS ?= -DNO_FPRINTF_OUTPUT $(CPPFLAGS_OPTIM_SUNDIALS) $(CXXFLAGS_F
 #CPPFLAGS_GTEST ?=
 
 
-## setup compiler flags
-CXXFLAGS_LANG ?= -std=c++1y
+ifeq ($(STAN_USE_CPP14),)
+  CXXFLAGS_LANG ?= -std=c++17
+else
+  $(warning "Because STAN_USE_CPP14 is set C++14 standard is requested. This will not be possible in the next release!")
+  CXXFLAGS_LANG ?= -std=c++1y
+endif
 #CXXFLAGS_BOOST ?=
 CXXFLAGS_SUNDIALS ?= -pipe $(CXXFLAGS_OPTIM_SUNDIALS) $(CPPFLAGS_FLTO_SUNDIALS)
 #CXXFLAGS_GTEST