build and test in c++11 and in c++98 mode

test/CMakeLists.txt

@@ -10,7 +10,9 @@ add_library(gmock STATIC
   ${FMT_GMOCK_DIR}/gmock-gtest-all.cc ${FMT_GMOCK_DIR}/gmock/gmock.h
   ${FMT_GMOCK_DIR}/gtest/gtest.h ${FMT_GMOCK_DIR}/gtest/gtest-spi.h)
 target_include_directories(gmock PUBLIC ${FMT_GMOCK_DIR})
-target_compile_options(gmock PUBLIC ${CPP11_FLAG})
+if (FMT_USE_CPP11)
+  target_compile_options(gmock PUBLIC ${CPP11_FLAG})
+endif ()
 
 find_package(Threads)
 if (Threads_FOUND)
@@ -112,18 +114,6 @@ if (HAVE_FNO_EXCEPTIONS_FLAG)
 endif ()
 
 if (FMT_PEDANTIC)
-  # syntax test which checks if the library builds in gnu++98 mode
-  file(GLOB test_src *.cc *.h)
-  file(GLOB lib_src ../cppformat/*.cc ../cppformat/*.h)
-  add_library(testformat STATIC ${test_src} ${lib_src})
-  target_include_directories(testformat PRIVATE .. ../gmock)
-  target_compile_definitions(testformat PRIVATE
-    FMT_USE_FILE_DESCRIPTORS=$<BOOL:${HAVE_OPEN}>)
-  check_cxx_compiler_flag(-std=gnu++98 HAVE_STD_GNUPP98_FLAG)
-  if (HAVE_STD_GNUPP98_FLAG)
-    target_compile_options(testformat PRIVATE -std=gnu++98)
-  endif ()
-
   # Test that the library compiles without windows.h.
   if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
     add_library(no-windows-h-test ../cppformat/format.cc)