diff --git a/ACE/include/makeinclude/platform_clang_common.GNU b/ACE/include/makeinclude/platform_clang_common.GNU
index 667d394e1da0e..0f53f913a3951 100644
--- a/ACE/include/makeinclude/platform_clang_common.GNU
+++ b/ACE/include/makeinclude/platform_clang_common.GNU
@@ -30,7 +30,6 @@ else
 endif
 
 CXX_VERSION := $(shell $(CXX_FOR_VERSION_TEST) -dumpversion)
-
 CXX_FULL_VERSION := $(shell $(CXX_FOR_VERSION_TEST) --version)
 
 # Only modify LDFLAGS if DLD has been set.
diff --git a/ACE/include/makeinclude/platform_g++_common.GNU b/ACE/include/makeinclude/platform_g++_common.GNU
index 6ce9bc5ce2433..7f6b8e7252f18 100644
--- a/ACE/include/makeinclude/platform_g++_common.GNU
+++ b/ACE/include/makeinclude/platform_g++_common.GNU
@@ -59,20 +59,18 @@ else
   CXX_FOR_VERSION_TEST ?= $(CXX)
 endif
 
-CXX_VERSION := $(shell $(CXX_FOR_VERSION_TEST) -dumpversion)
-CXX_MACHINE := $(shell $(CXX_FOR_VERSION_TEST) -dumpmachine)
-ifeq (cmd,$(findstring cmd,$(SHELL)))
-CXX_MAJOR_VERSION := $(firstword $(subst ., ,$(CXX_VERSION)))
-else
-CXX_MAJOR_VERSION := $(shell $(CXX_FOR_VERSION_TEST) -dumpversion | sed -e 's/[^0-9\.]//g' | sed -e 's/\..*$$//')
+ifndef CXX_VERSION
+  CXX_VERSION := $(shell $(CXX_FOR_VERSION_TEST) -dumpversion)
 endif
-ifeq (cmd,$(findstring cmd,$(SHELL)))
-CXX_MINOR_VERSION := $(word 2,$(subst ., ,$(CXX_VERSION)))
-else
-CXX_MINOR_VERSION := $(shell $(CXX_FOR_VERSION_TEST) -dumpversion | sed -e 's/[^0-9\.]//g' | sed -e 's/^[0-9]*\.//' | sed -e 's/\..*$$//')
+ifndef CXX_MACHINE
+  CXX_MACHINE := $(shell $(CXX_FOR_VERSION_TEST) -dumpmachine)
+endif
+ifndef CXX_FULL_VERSION
+  CXX_FULL_VERSION := $(shell $(CXX_FOR_VERSION_TEST) --version)
 endif
 
-CXX_FULL_VERSION := $(shell $(CXX_FOR_VERSION_TEST) --version)
+CXX_MAJOR_VERSION := $(firstword $(subst ., ,$(CXX_VERSION)))
+CXX_MINOR_VERSION := $(word 2,$(subst ., ,$(CXX_VERSION)))
 
 # Minimum C++ level is now C++17, gcc until version 11 have an older version as default
 ifeq ($(CXX_MAJOR_VERSION),7)
diff --git a/ACE/include/makeinclude/platform_gcc_clang_common.GNU b/ACE/include/makeinclude/platform_gcc_clang_common.GNU
index 214da114ec62a..62c9dc23bf3fd 100644
--- a/ACE/include/makeinclude/platform_gcc_clang_common.GNU
+++ b/ACE/include/makeinclude/platform_gcc_clang_common.GNU
@@ -55,8 +55,6 @@ else ifeq ($(c++20),1)
   CCFLAGS += -std=c++20
 else ifeq ($(c++17),1)
   CCFLAGS += -std=c++17
-else ifeq ($(c++14),1)
-  CCFLAGS += -std=c++14
 endif
 
 # If no option has been specified, set templates to automatic
diff --git a/ACE/include/makeinclude/platform_linux.GNU b/ACE/include/makeinclude/platform_linux.GNU
index 466fb28661369..574a65462685f 100644
--- a/ACE/include/makeinclude/platform_linux.GNU
+++ b/ACE/include/makeinclude/platform_linux.GNU
@@ -10,16 +10,11 @@ else
   CXX_FOR_VERSION_TEST ?= g++
 endif
 
-CXX_FULL_VERSION := $(shell $(CXX_FOR_VERSION_TEST) --version)
-CXX_VERSION := $(shell $(CXX_FOR_VERSION_TEST) -dumpversion)
-
-ifeq (Ubuntu, $(findstring Ubuntu,$(LSB_RELEASE_ID)))
-  ifeq (7.10, $(findstring 7.10,$(LSB_RELEASE_RELEASE)))
-    no_hidden_visibility ?= 1
-  endif
-  ifeq (7.04, $(findstring 7.04,$(LSB_RELEASE_RELEASE)))
-    no_hidden_visibility ?= 1
-  endif
+ifndef CXX_FULL_VERSION
+  CXX_FULL_VERSION := $(shell $(CXX_FOR_VERSION_TEST) --version)
+endif
+ifndef CXX_VERSION
+  CXX_VERSION := $(shell $(CXX_FOR_VERSION_TEST) -dumpversion)
 endif
 
 ifeq ($(buildbits),32)
@@ -52,15 +47,8 @@ endif
 #
 include $(ACE_ROOT)/include/makeinclude/platform_g++_common.GNU
 
-# TAO with GCC 4.0.2 and -O3 seems to result in runtime issues, for example
-# the ForwardRequest PI test will fail. For GCC 4.0.2 we default to -O2
-ifeq ($(CXX_VERSION),4.0.2)
-  OCFLAGS ?= -O2
-  OCCFLAGS ?=-O2
-else
-  OCFLAGS ?= -O3
-  OCCFLAGS ?= -O3
-endif
+OCFLAGS ?= -O3
+OCCFLAGS ?= -O3
 
 #### GNU gas has a string limit of 4096 characters.  On Alphas,
 #### builds will fail due to running over that limit.  There are
diff --git a/ACE/include/makeinclude/platform_linux_clang.GNU b/ACE/include/makeinclude/platform_linux_clang.GNU
index 2f251d0858675..4eaf019d9d5d8 100644
--- a/ACE/include/makeinclude/platform_linux_clang.GNU
+++ b/ACE/include/makeinclude/platform_linux_clang.GNU
@@ -12,12 +12,7 @@ endif
 ifndef CXX_VERSION
   CXX_VERSION := $(shell $(CXX) -dumpversion)
 endif
-ifeq (cmd,$(findstring cmd,$(SHELL)))
 CXX_MAJOR_VERSION := $(firstword $(subst ., ,$(CXX_VERSION)))
-else
-CXX_MAJOR_DOT = $(word $2,$(subst ., ,$1))
-CXX_MAJOR_VERSION := $(call CXX_MAJOR_DOT,$(CXX_VERSION),1)
-endif
 
 # clang 16 and newer default to C++17
 ifeq ($(CXX_MAJOR_VERSION),$(filter $(CXX_MAJOR_VERSION),4 5 6 7 8 9 10 11 12 13 14 15))
@@ -47,8 +42,6 @@ else ifeq ($(c++20),1)
   CCFLAGS += -std=c++20
 else ifeq ($(c++17),1)
   CCFLAGS += -std=c++17
-else ifeq ($(c++14),1)
-  CCFLAGS += -std=c++14
 endif
 
 ifeq ($(no_deprecated),1)