Disable warning 4127 under msvc-12.0 and earlier

This reverts commit 40fda50ae1.

.github/workflows/ci.yml

@@ -628,7 +628,7 @@ jobs:
             os: windows-11-arm
 
     runs-on: ${{matrix.os}}
-    timeout-minutes: 45
+    timeout-minutes: 60
 
     steps:
       - name: Setup Boost

include/boost/core/lightweight_test.hpp

@@ -551,22 +551,15 @@ inline void lwt_init()
 #define BOOST_TEST_ALL_EQ(begin1, end1, begin2, end2) ( ::boost::detail::test_all_eq_impl(BOOST_LIGHTWEIGHT_TEST_OSTREAM, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, begin1, end1, begin2, end2) )
 #define BOOST_TEST_ALL_WITH(begin1, end1, begin2, end2, predicate) ( ::boost::detail::test_all_with_impl(BOOST_LIGHTWEIGHT_TEST_OSTREAM, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, begin1, end1, begin2, end2, predicate) )
 
-#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1900)
-// The usual idiom for multiline macros. But disabled for MSVC versions
-// prior to 2015, which would emit a "conditional expression is constant"
-// warning that we could not silence with a _Pragma, despite this being
-// the same thing described here:
-//
-// <https://learn.microsoft.com/en-us/cpp/preprocessor/pragma-directives-and-the-pragma-keyword?view=msvc-140>.
-//
-   #define BOOST_LWT_DETAIL_DO_WHILE_FALSE( x ) do { x } while (false)
+#if defined(BOOST_MSVC) && BOOST_MSVC < 1900
+# define BOOST_LWT_DETAIL_WHILE_FALSE __pragma(warning(push)) __pragma(warning(disable:4127)) while(false) __pragma(warning(pop))
 #else
-   #define BOOST_LWT_DETAIL_DO_WHILE_FALSE( x ) x
+# define BOOST_LWT_DETAIL_WHILE_FALSE while(false)
 #endif
 
 #ifndef BOOST_NO_EXCEPTIONS
    #define BOOST_TEST_THROWS( EXPR, EXCEP )                              \
-      BOOST_LWT_DETAIL_DO_WHILE_FALSE(                                   \
+      do {                                                               \
          try {                                                           \
             EXPR;                                                        \
             ::boost::detail::throw_failed_impl                           \
@@ -579,15 +572,14 @@ inline void lwt_init()
             ::boost::detail::throw_failed_impl                           \
             (#EXPR, #EXCEP, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
          }                                                               \
-      )
-   //
+      } BOOST_LWT_DETAIL_WHILE_FALSE
 #else
-   #define BOOST_TEST_THROWS( EXPR, EXCEP ) BOOST_LWT_DETAIL_DO_WHILE_FALSE((void)0;)
+   #define BOOST_TEST_THROWS( EXPR, EXCEP ) do {} BOOST_LWT_DETAIL_WHILE_FALSE
 #endif
 
 #ifndef BOOST_NO_EXCEPTIONS
 #  define BOOST_TEST_NO_THROW(EXPR)                                        \
-     BOOST_LWT_DETAIL_DO_WHILE_FALSE(                                      \
+    do {                                                                   \
         try {                                                              \
             EXPR;                                                          \
         } catch (const std::exception& e) {                                \
@@ -597,10 +589,9 @@ inline void lwt_init()
             ::boost::detail::no_throw_failed_impl                          \
             (#EXPR, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION);           \
         }                                                                  \
-    )
-    //
+    } BOOST_LWT_DETAIL_WHILE_FALSE
 #else
-#  define BOOST_TEST_NO_THROW(EXPR) BOOST_LWT_DETAIL_DO_WHILE_FALSE(EXPR;)
+#  define BOOST_TEST_NO_THROW(EXPR) do { EXPR; } BOOST_LWT_DETAIL_WHILE_FALSE
 #endif
 
 #endif // #ifndef BOOST_CORE_LIGHTWEIGHT_TEST_HPP