FindBoost: Add suport for custom namespaces

When building boost with an alternate namespace the libraries generated
will have a different naming convention.  This is often done to ensure
no symbol conflicts with external libraries built against a different
version of boost.  If the namespace used is "myprivateboost::" instead
of "boost::" then the libraries built will be named myprivateboost_foo
instead of boost_foo.  Add an option to specify a custom namespace used
to alter the library names that get searched for.

2 files changed, 42 insertions, 25 deletions

diff --git a/Help/release/dev/Boost_NAMESPACE.rst b/Help/release/dev/Boost_NAMESPACE.rst
new file mode 100644
index 0000000..434db29
--- /dev/null
+++ b/Help/release/dev/Boost_NAMESPACE.rst
@@ -0,0 +1,5 @@
+Boost_NAMESPACE
+---------------
+
+* The :module:`FindBoost` module learned a new ``Boost_NAMESPACE``
+  option to change the ``boost`` prefix on library names.
diff --git a/Modules/FindBoost.cmake b/Modules/FindBoost.cmake
index 945694d..a57e12c 100644
--- a/Modules/FindBoost.cmake
+++ b/Modules/FindBoost.cmake
@@ -99,6 +99,9 @@
 #   Boost_THREADAPI          - Suffix for "thread" component library name,
 #                              such as "pthread" or "win32".  Names with
 #                              and without this suffix will both be tried.
+#   Boost_NAMESPACE          - Alternate namespace used to build boost with
+#                              e.g. if set to "myboost", will search for
+#                              myboost_thread instead of boost_thread.
 #
 # Other variables one may set to control this module are::
 #
@@ -736,10 +739,24 @@ else()
 endif()
 
 # ------------------------------------------------------------------------
+#  Prefix initialization
+# ------------------------------------------------------------------------
+
+set(Boost_LIB_PREFIX "")
+if ( WIN32 AND Boost_USE_STATIC_LIBS AND NOT CYGWIN)
+  set(Boost_LIB_PREFIX "lib")
+endif()
+
+if ( NOT Boost_NAMESPACE )
+  set(Boost_NAMESPACE "boost")
+endif()
+
+# ------------------------------------------------------------------------
 #  Suffix initialization and compiler suffix detection.
 # ------------------------------------------------------------------------
 
 set(_Boost_VARS_NAME
+  Boost_NAMESPACE
   Boost_COMPILER
   Boost_THREADAPI
   Boost_USE_DEBUG_PYTHON
@@ -752,11 +769,6 @@ set(_Boost_VARS_NAME
 _Boost_CHANGE_DETECT(_Boost_CHANGE_LIBNAME ${_Boost_VARS_NAME})
 
 # Setting some more suffixes for the library
-set(Boost_LIB_PREFIX "")
-if ( WIN32 AND Boost_USE_STATIC_LIBS AND NOT CYGWIN)
-  set(Boost_LIB_PREFIX "lib")
-endif()
-
 if (Boost_COMPILER)
   set(_boost_COMPILER ${Boost_COMPILER})
   if(Boost_DEBUG)
@@ -966,18 +978,18 @@ foreach(COMPONENT ${Boost_FIND_COMPONENTS})
   # Find RELEASE libraries
   #
   set(_boost_RELEASE_NAMES
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}-${Boost_LIB_VERSION}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}-${Boost_LIB_VERSION}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_ABI_TAG}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT} )
+    ${Boost_LIB_PREFIX}${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}
+    ${Boost_LIB_PREFIX}${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}")
     list(APPEND _boost_RELEASE_NAMES
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG}
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_RELEASE_STATIC_ABI_TAG} )
+      ${Boost_LIB_PREFIX}${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()
   if(Boost_THREADAPI AND ${COMPONENT} STREQUAL "thread")
      _Boost_PREPEND_LIST_WITH_THREADAPI(_boost_RELEASE_NAMES ${_boost_RELEASE_NAMES})
@@ -1001,19 +1013,19 @@ foreach(COMPONENT ${Boost_FIND_COMPONENTS})
   # Find DEBUG libraries
   #
   set(_boost_DEBUG_NAMES
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}-${Boost_LIB_VERSION}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}-${Boost_LIB_VERSION}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_ABI_TAG}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}
-    ${Boost_LIB_PREFIX}boost_${COMPONENT} )
+    ${Boost_LIB_PREFIX}${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}
+    ${Boost_LIB_PREFIX}${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}")
     list(APPEND _boost_DEBUG_NAMES
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_COMPILER}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG}
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG}-${Boost_LIB_VERSION}
-      ${Boost_LIB_PREFIX}boost_${COMPONENT}${_boost_MULTITHREADED}${_boost_DEBUG_STATIC_ABI_TAG} )
+      ${Boost_LIB_PREFIX}${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()
   if(Boost_THREADAPI AND ${COMPONENT} STREQUAL "thread")
      _Boost_PREPEND_LIST_WITH_THREADAPI(_boost_DEBUG_NAMES ${_boost_DEBUG_NAMES})
@@ -1086,7 +1098,7 @@ if(Boost_FOUND)
       "${Boost_ERROR_REASON} Boost libraries:\n")
     foreach(COMPONENT ${_Boost_MISSING_COMPONENTS})
       set(Boost_ERROR_REASON
-        "${Boost_ERROR_REASON}        boost_${COMPONENT}\n")
+        "${Boost_ERROR_REASON}        ${Boost_NAMESPACE}_${COMPONENT}\n")
     endforeach()
 
     list(LENGTH Boost_FIND_COMPONENTS Boost_NUM_COMPONENTS_WANTED)