Add infrastructure to detect secondary compiler version information

Create a `CMAKE_<LANG>_COMPILER_VERSION_INTERNAL` variable to hold
a secondary/internal compiler version number detected at the same
time as the primary compiler version.  This will be useful for some
compilers where we need such a number to determine correct usage.

Inspired-by: Stefan Andersson <tfosm@hotmail.com>
Suggested-by: Norbert Lange <norbert.lange@andritz.com>
Issue: #17264

8 files changed, 34 insertions, 0 deletions

diff --git a/Help/manual/cmake-variables.7.rst b/Help/manual/cmake-variables.7.rst
index f94c008..2e369e3 100644
--- a/Help/manual/cmake-variables.7.rst
+++ b/Help/manual/cmake-variables.7.rst
@@ -400,6 +400,7 @@ Variables for Languages
    /variable/CMAKE_LANG_COMPILER_PREDEFINES_COMMAND
    /variable/CMAKE_LANG_COMPILER_TARGET
    /variable/CMAKE_LANG_COMPILER_VERSION
+   /variable/CMAKE_LANG_COMPILER_VERSION_INTERNAL
    /variable/CMAKE_LANG_COMPILE_OBJECT
    /variable/CMAKE_LANG_CREATE_SHARED_LIBRARY
    /variable/CMAKE_LANG_CREATE_SHARED_MODULE
diff --git a/Help/variable/CMAKE_LANG_COMPILER_VERSION_INTERNAL.rst b/Help/variable/CMAKE_LANG_COMPILER_VERSION_INTERNAL.rst
new file mode 100644
index 0000000..c3cd980
--- /dev/null
+++ b/Help/variable/CMAKE_LANG_COMPILER_VERSION_INTERNAL.rst
@@ -0,0 +1,8 @@
+CMAKE_<LANG>_COMPILER_VERSION_INTERNAL
+--------------------------------------
+
+An internal variable subject to change.
+
+This is used to identify the variant of a compiler based on an internal
+version number.  For some compilers this is needed to determine the
+correct usage.
diff --git a/Modules/CMakeCCompiler.cmake.in b/Modules/CMakeCCompiler.cmake.in
index 92259dd..8ad0c01 100644
--- a/Modules/CMakeCCompiler.cmake.in
+++ b/Modules/CMakeCCompiler.cmake.in
@@ -2,6 +2,7 @@ set(CMAKE_C_COMPILER "@CMAKE_C_COMPILER@")
 set(CMAKE_C_COMPILER_ARG1 "@CMAKE_C_COMPILER_ARG1@")
 set(CMAKE_C_COMPILER_ID "@CMAKE_C_COMPILER_ID@")
 set(CMAKE_C_COMPILER_VERSION "@CMAKE_C_COMPILER_VERSION@")
+set(CMAKE_C_COMPILER_VERSION_INTERNAL "@CMAKE_C_COMPILER_VERSION_INTERNAL@")
 set(CMAKE_C_COMPILER_WRAPPER "@CMAKE_C_COMPILER_WRAPPER@")
 set(CMAKE_C_STANDARD_COMPUTED_DEFAULT "@CMAKE_C_STANDARD_COMPUTED_DEFAULT@")
 set(CMAKE_C_COMPILE_FEATURES "@CMAKE_C_COMPILE_FEATURES@")
diff --git a/Modules/CMakeCCompilerId.c.in b/Modules/CMakeCCompilerId.c.in
index 95184c9..10f7318 100644
--- a/Modules/CMakeCCompilerId.c.in
+++ b/Modules/CMakeCCompilerId.c.in
@@ -67,6 +67,9 @@ int main(int argc, char* argv[])
 #ifdef COMPILER_VERSION_MAJOR
   require += info_version[argc];
 #endif
+#ifdef COMPILER_VERSION_INTERNAL
+  require += info_version_internal[argc];
+#endif
 #ifdef SIMULATE_ID
   require += info_simulate[argc];
 #endif
diff --git a/Modules/CMakeCXXCompiler.cmake.in b/Modules/CMakeCXXCompiler.cmake.in
index 47fc624..df57a4f 100644
--- a/Modules/CMakeCXXCompiler.cmake.in
+++ b/Modules/CMakeCXXCompiler.cmake.in
@@ -2,6 +2,7 @@ set(CMAKE_CXX_COMPILER "@CMAKE_CXX_COMPILER@")
 set(CMAKE_CXX_COMPILER_ARG1 "@CMAKE_CXX_COMPILER_ARG1@")
 set(CMAKE_CXX_COMPILER_ID "@CMAKE_CXX_COMPILER_ID@")
 set(CMAKE_CXX_COMPILER_VERSION "@CMAKE_CXX_COMPILER_VERSION@")
+set(CMAKE_CXX_COMPILER_VERSION_INTERNAL "@CMAKE_CXX_COMPILER_VERSION_INTERNAL@")
 set(CMAKE_CXX_COMPILER_WRAPPER "@CMAKE_CXX_COMPILER_WRAPPER@")
 set(CMAKE_CXX_STANDARD_COMPUTED_DEFAULT "@CMAKE_CXX_STANDARD_COMPUTED_DEFAULT@")
 set(CMAKE_CXX_COMPILE_FEATURES "@CMAKE_CXX_COMPILE_FEATURES@")
diff --git a/Modules/CMakeCXXCompilerId.cpp.in b/Modules/CMakeCXXCompilerId.cpp.in
index 6572bb3..4cb2267 100644
--- a/Modules/CMakeCXXCompilerId.cpp.in
+++ b/Modules/CMakeCXXCompilerId.cpp.in
@@ -55,6 +55,9 @@ int main(int argc, char* argv[])
 #ifdef COMPILER_VERSION_MAJOR
   require += info_version[argc];
 #endif
+#ifdef COMPILER_VERSION_INTERNAL
+  require += info_version_internal[argc];
+#endif
 #ifdef SIMULATE_ID
   require += info_simulate[argc];
 #endif
diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index cddc966..7efe739 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -108,6 +108,7 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
   set(CMAKE_${lang}_XCODE_CURRENT_ARCH "${CMAKE_${lang}_XCODE_CURRENT_ARCH}" PARENT_SCOPE)
   set(CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX "${CMAKE_${lang}_CL_SHOWINCLUDES_PREFIX}" PARENT_SCOPE)
   set(CMAKE_${lang}_COMPILER_VERSION "${CMAKE_${lang}_COMPILER_VERSION}" PARENT_SCOPE)
+  set(CMAKE_${lang}_COMPILER_VERSION_INTERNAL "${CMAKE_${lang}_COMPILER_VERSION_INTERNAL}" PARENT_SCOPE)
   set(CMAKE_${lang}_COMPILER_WRAPPER "${CMAKE_${lang}_COMPILER_WRAPPER}" PARENT_SCOPE)
   set(CMAKE_${lang}_SIMULATE_ID "${CMAKE_${lang}_SIMULATE_ID}" PARENT_SCOPE)
   set(CMAKE_${lang}_SIMULATE_VERSION "${CMAKE_${lang}_SIMULATE_VERSION}" PARENT_SCOPE)
@@ -473,6 +474,7 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
     set(COMPILER_VERSION_MINOR 0)
     set(COMPILER_VERSION_PATCH 0)
     set(COMPILER_VERSION_TWEAK 0)
+    set(COMPILER_VERSION_INTERNAL "")
     set(HAVE_COMPILER_VERSION_MAJOR 0)
     set(HAVE_COMPILER_VERSION_MINOR 0)
     set(HAVE_COMPILER_VERSION_PATCH 0)
@@ -514,6 +516,10 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
         string(REGEX REPLACE "^0+([0-9])" "\\1" COMPILER_VERSION "${CMAKE_MATCH_1}")
         string(REGEX REPLACE "\\.0+([0-9])" ".\\1" COMPILER_VERSION "${COMPILER_VERSION}")
       endif()
+      if("${info}" MATCHES "INFO:compiler_version_internal\\[([^]\"]*)\\]")
+        string(REGEX REPLACE "^0+([0-9])" "\\1" COMPILER_VERSION_INTERNAL "${CMAKE_MATCH_1}")
+        string(REGEX REPLACE "\\.0+([0-9])" ".\\1" COMPILER_VERSION_INTERNAL "${COMPILER_VERSION_INTERNAL}")
+      endif()
       foreach(comp MAJOR MINOR PATCH TWEAK)
         foreach(digit 1 2 3 4 5 6 7 8 9)
           if("${info}" MATCHES "INFO:compiler_version_${comp}_digit_${digit}\\[([0-9])\\]")
@@ -589,6 +595,7 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
       set(CMAKE_${lang}_COMPILER_ARCHITECTURE_ID "${ARCHITECTURE_ID}")
       set(MSVC_${lang}_ARCHITECTURE_ID "${ARCHITECTURE_ID}")
       set(CMAKE_${lang}_COMPILER_VERSION "${COMPILER_VERSION}")
+      set(CMAKE_${lang}_COMPILER_VERSION_INTERNAL "${COMPILER_VERSION_INTERNAL}")
       set(CMAKE_${lang}_SIMULATE_ID "${SIMULATE_ID}")
       set(CMAKE_${lang}_SIMULATE_VERSION "${SIMULATE_VERSION}")
     endif()
@@ -640,6 +647,7 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
   set(MSVC_${lang}_ARCHITECTURE_ID "${MSVC_${lang}_ARCHITECTURE_ID}"
     PARENT_SCOPE)
   set(CMAKE_${lang}_COMPILER_VERSION "${CMAKE_${lang}_COMPILER_VERSION}" PARENT_SCOPE)
+  set(CMAKE_${lang}_COMPILER_VERSION_INTERNAL "${CMAKE_${lang}_COMPILER_VERSION_INTERNAL}" PARENT_SCOPE)
   set(CMAKE_${lang}_COMPILER_WRAPPER "${COMPILER_WRAPPER}" PARENT_SCOPE)
   set(CMAKE_${lang}_SIMULATE_ID "${CMAKE_${lang}_SIMULATE_ID}" PARENT_SCOPE)
   set(CMAKE_${lang}_SIMULATE_VERSION "${CMAKE_${lang}_SIMULATE_VERSION}" PARENT_SCOPE)
diff --git a/Modules/CMakePlatformId.h.in b/Modules/CMakePlatformId.h.in
index a6a9c0a..dd77379 100644
--- a/Modules/CMakePlatformId.h.in
+++ b/Modules/CMakePlatformId.h.in
@@ -201,6 +201,15 @@ char const info_version[] = {
   ']','\0'};
 #endif
 
+/* Construct a string literal encoding the internal version number. */
+#ifdef COMPILER_VERSION_INTERNAL
+char const info_version_internal[] = {
+  'I', 'N', 'F', 'O', ':',
+  'c','o','m','p','i','l','e','r','_','v','e','r','s','i','o','n','_',
+  'i','n','t','e','r','n','a','l','[',
+  COMPILER_VERSION_INTERNAL,']','\0'};
+#endif
+
 /* Construct a string literal encoding the version number components. */
 #ifdef SIMULATE_VERSION_MAJOR
 char const info_simulate_version[] = {