Fix test builds with C++11

include/fmt/format.h

@@ -3645,7 +3645,7 @@ FMT_END_NAMESPACE
 
 #define FMT_STRING(s) [] { \
     struct S : fmt::format_string { \
-      static FMT_CONSTEXPR auto data() { return s; } \
+      static FMT_CONSTEXPR decltype(s) data() { return s; } \
       static FMT_CONSTEXPR size_t size() { return sizeof(s); } \
     }; \
     return S{}; \

test/CMakeLists.txt

@@ -7,7 +7,6 @@
 # at http://code.google.com/p/googletest/wiki/FAQ for more details.
 add_library(gmock STATIC
   gmock-gtest-all.cc gmock/gmock.h gtest/gtest.h gtest/gtest-spi.h)
-target_compile_options(gmock PUBLIC ${CPP14_FLAG})
 target_compile_definitions(gmock PUBLIC GTEST_HAS_STD_WSTRING=1)
 target_include_directories(gmock PUBLIC .)
 
@@ -94,12 +93,6 @@ add_fmt_test(util-test mock-allocator.h)
 add_fmt_test(custom-formatter-test)
 #add_fmt_test(ranges-test)
 
-# Enable stricter options for one test to make sure that the header is free of
-# warnings.
-if (FMT_PEDANTIC AND MSVC)
-  target_compile_options(format-test PRIVATE /W4)
-endif ()
-
 if (HAVE_OPEN)
   add_fmt_executable(posix-mock-test
     posix-mock-test.cc ../src/format.cc ${TEST_MAIN_SRC})
@@ -126,7 +119,6 @@ endif ()
 check_cxx_compiler_flag(-fno-exceptions HAVE_FNO_EXCEPTIONS_FLAG)
 if (HAVE_FNO_EXCEPTIONS_FLAG)
   add_library(noexception-test ../src/format.cc)
-  target_compile_options(noexception-test PUBLIC ${CPP14_FLAG})
   target_include_directories(
     noexception-test PRIVATE ${PROJECT_SOURCE_DIR}/include)
   target_compile_options(noexception-test PRIVATE -fno-exceptions)
@@ -136,7 +128,6 @@ if (FMT_PEDANTIC)
   # Test that the library compiles without windows.h.
   if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
     add_library(no-windows-h-test ../src/format.cc)
-    target_compile_options(no-windows-h-test PUBLIC ${CPP14_FLAG})
     target_include_directories(
       no-windows-h-test PRIVATE ${PROJECT_SOURCE_DIR}/include)
     target_compile_definitions(no-windows-h-test PRIVATE FMT_USE_WINDOWS_H=0)
@@ -150,7 +141,7 @@ if (FMT_PEDANTIC)
     --build-makeprogram ${CMAKE_MAKE_PROGRAM}
     --build-options
     "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
-    "-DCPP14_FLAG=${CPP14_FLAG}"
+    "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
     "-DSUPPORTS_USER_DEFINED_LITERALS=${SUPPORTS_USER_DEFINED_LITERALS}")
 
   # test if the targets are findable from the build directory
@@ -163,7 +154,7 @@ if (FMT_PEDANTIC)
     --build-makeprogram ${CMAKE_MAKE_PROGRAM}
     --build-options
     "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
-    "-DCPP14_FLAG=${CPP14_FLAG}"
+    "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
     "-DFMT_DIR=${PROJECT_BINARY_DIR}"
     "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
 
@@ -177,6 +168,6 @@ if (FMT_PEDANTIC)
     --build-makeprogram ${CMAKE_MAKE_PROGRAM}
     --build-options
     "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
-    "-DCPP14_FLAG=${CPP14_FLAG}"
+    "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
     "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
 endif ()

test/add-subdirectory-test/CMakeLists.txt

@@ -5,11 +5,9 @@ project(fmt-test)
 add_subdirectory(../.. fmt)
 
 add_executable(library-test "main.cc")
-target_compile_options(library-test PUBLIC ${CPP14_FLAG})
 target_link_libraries(library-test fmt::fmt)
 
 if (TARGET fmt::fmt-header-only)
   add_executable(header-only-test "main.cc")
-  target_compile_options(header-only-test PUBLIC ${CPP14_FLAG})
   target_link_libraries(header-only-test fmt::fmt-header-only)
 endif ()

test/compile-test/CMakeLists.txt

@@ -4,7 +4,6 @@ cmake_minimum_required(VERSION 2.8)
 
 include(CheckCXXSourceCompiles)
 set(CMAKE_REQUIRED_INCLUDES ${CMAKE_CURRENT_SOURCE_DIR}/../../include)
-set(CMAKE_REQUIRED_FLAGS ${CPP14_FLAG})
 
 function (generate_source result fragment)
   set(${result} "

test/find-package-test/CMakeLists.txt

@@ -5,11 +5,9 @@ project(fmt-test)
 find_package(FMT REQUIRED)
 
 add_executable(library-test main.cc)
-target_compile_options(library-test PUBLIC ${CPP14_FLAG})
 target_link_libraries(library-test fmt::fmt)
 
 if (TARGET fmt::fmt-header-only)
   add_executable(header-only-test main.cc)
-  target_compile_options(header-only-test PUBLIC ${CPP14_FLAG})
   target_link_libraries(header-only-test fmt::fmt-header-only)
 endif ()