FindBoost: Allow testing for multiple compiler suffixes

This is to permit VS2017 to make use of the vc141 suffix or
fall back to the compatible vc140 to use Boost libraries built
with VS2015.

Cherry picked from commit 3ca6f70f8b27c08ad3470542705701e6e8e6ea05
plus a fixup from commit 6115875bf0faef61c558e46395e67bdfd4ad48e1
for backport to CMake 3.8.

1 files changed, 30 insertions, 12 deletions

diff --git a/Modules/FindBoost.cmake b/Modules/FindBoost.cmake
index e2a5860..3059d25 100644
--- a/Modules/FindBoost.cmake
+++ b/Modules/FindBoost.cmake
@@ -127,7 +127,10 @@
 #                              ('n' tag).  Default is OFF.
 #   Boost_COMPILER           - Set to the compiler-specific library suffix
 #                              (e.g. "-gcc43").  Default is auto-computed
-#                              for the C++ compiler in use.
+#                              for the C++ compiler in use.  A list may be
+#                              used if multiple compatible suffixes should
+#                              be tested for, in decreasing order of
+#                              preference.
 #   Boost_THREADAPI          - Suffix for "thread" component library name,
 #                              such as "pthread" or "win32".  Names with
 #                              and without this suffix will both be tried.
@@ -428,7 +431,7 @@ function(_Boost_GUESS_COMPILER_PREFIX _ret)
     set(_boost_COMPILER "-ghs")
   elseif("x${CMAKE_CXX_COMPILER_ID}" STREQUAL "xMSVC")
     if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.10)
-      set(_boost_COMPILER "-vc141")
+      set(_boost_COMPILER "-vc141;-vc140")
     elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19)
       set(_boost_COMPILER "-vc140")
     elseif(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18)
@@ -902,6 +905,7 @@ function(_Boost_UPDATE_WINDOWS_LIBRARY_SEARCH_DIRS_WITH_PREBUILT_PATHS component
     endif()
     if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.10)
       list(APPEND ${componentlibvar} ${basedir}/lib${_arch_suffix}-msvc-14.1)
+      list(APPEND ${componentlibvar} ${basedir}/lib${_arch_suffix}-msvc-14.0)
     elseif(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19)
       list(APPEND ${componentlibvar} ${basedir}/lib${_arch_suffix}-msvc-14.0)
     elseif(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18)
@@ -1525,17 +1529,24 @@ foreach(COMPONENT ${Boost_FIND_COMPONENTS})
   #
   # Find RELEASE libraries
   #
-  set(_boost_RELEASE_NAMES
-    ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}-${Boost_LIB_VERSION}
-    ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}
+  unset(_boost_RELEASE_NAMES)
+  foreach(compiler IN LISTS _boost_COMPILER)
+    list(APPEND _boost_RELEASE_NAMES
+      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}-${Boost_LIB_VERSION}
+      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG} )
+  endforeach()
+  list(APPEND _boost_RELEASE_NAMES
     ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}-${Boost_LIB_VERSION}
     ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}
     ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT} )
   if(_boost_STATIC_RUNTIME_WORKAROUND)
     set(_boost_RELEASE_STATIC_ABI_TAG "-s${_boost_RELEASE_ABI_TAG}")
+    foreach(compiler IN LISTS _boost_COMPILER)
+      list(APPEND _boost_RELEASE_NAMES
+        ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
+        ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG} )
+    endforeach()
     list(APPEND _boost_RELEASE_NAMES
-      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
-      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG}
       ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
       ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG} )
   endif()
@@ -1566,18 +1577,25 @@ foreach(COMPONENT ${Boost_FIND_COMPONENTS})
   #
   # Find DEBUG libraries
   #
-  set(_boost_DEBUG_NAMES
-    ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}-${Boost_LIB_VERSION}
-    ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}
+  unset(_boost_DEBUG_NAMES)
+  foreach(compiler IN LISTS _boost_COMPILER)
+    list(APPEND _boost_DEBUG_NAMES
+      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}-${Boost_LIB_VERSION}
+      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG} )
+  endforeach()
+  list(APPEND _boost_DEBUG_NAMES
     ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}-${Boost_LIB_VERSION}
     ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}
     ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}
     ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT} )
   if(_boost_STATIC_RUNTIME_WORKAROUND)
     set(_boost_DEBUG_STATIC_ABI_TAG "-s${_boost_DEBUG_ABI_TAG}")
+    foreach(compiler IN LISTS _boost_COMPILER)
+      list(APPEND _boost_DEBUG_NAMES
+        ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
+        ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${compiler}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG} )
+    endforeach()
     list(APPEND _boost_DEBUG_NAMES
-      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
-      ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG}
       ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
       ${Boost_LIB_PREFIX}${Boost_NAMESPACE}_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG} )
   endif()