From: Dima Kogan <dkogan@debian.org>
Date: Fri, 31 Jan 2020 00:55:26 +0100
Subject: 0003-If-building-with-double-precision-namespace-all-libr

I want to produce libraries with different filenames if we're building
double-precision-enabled libraries. This makes it possible to ship both builds
to the users, and to let them decide which they want based on the filename. I do
this by overriding the CMake library-defining and library-using functions
(add_library, target_link_libraries, ...) to add a suffix to the
double-precision libraries
---
 CMakeLists.txt  | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 bullet.pc.cmake |  2 +-
 2 files changed, 81 insertions(+), 4 deletions(-)

Index: bullet/CMakeLists.txt
===================================================================
--- bullet.orig/CMakeLists.txt
+++ bullet/CMakeLists.txt
@@ -1,4 +1,81 @@
-cmake_minimum_required(VERSION 2.4.3)
+cmake_minimum_required(VERSION 3.3)
+
+# I want to produce libraries with different filenames if we're building
+# double-precision-enabled libraries. This makes it possible to ship both builds
+# to the users, and to let them decide which they want based on the filename. I
+# do this by overriding the CMake library-defining and library-using functions
+# (add_library, target_link_libraries, ...) to add a suffix to the
+# double-precision libraries
+IF (USE_DOUBLE_PRECISION)
+  set( lib_type_suffix "-float64" )
+else()
+  set( lib_type_suffix "" )
+endif()
+set( libs_in_this_project 
+  "BulletRobotics"
+  "ConvexDecomposition"
+  "GIMPACTUtils"
+  "GIMPACTUtilsHACD"
+  "BlenderSerialize"
+  "BulletFileLoader"
+  "BulletDNA"
+  "Bullet3Collision"
+  "Bullet3Common"
+  "Bullet3Dynamics"
+  "Bullet3Geometry"
+  "Bullet3OpenCL_clew"
+  "Bullet2FileLoader"
+  "BulletCollision"
+  "BulletDynamics"
+  "BulletInverseDynamics"
+  "BulletSoftBody"
+  "LinearMath"
+  "BulletInverseDynamicsUtils"
+  "BulletWorldImporter"
+  "BulletXmlWorldImporter"
+  "HACD"
+  )
+function(add_library)
+  SET( _lib_here ${ARGV0} )
+  LIST(REMOVE_AT ARGN 0)
+  _add_library("${_lib_here}${lib_type_suffix}" ${ARGN})
+endfunction()
+function(SET_TARGET_PROPERTIES)
+  SET( _lib_here ${ARGV0} )
+  LIST(REMOVE_AT ARGN 0)
+  _SET_TARGET_PROPERTIES("${_lib_here}${lib_type_suffix}" ${ARGN})
+endfunction()
+function(TARGET_LINK_LIBRARIES)
+  SET(_libs_suffixed "")
+  FOREACH(f ${ARGN})
+    if (${f} IN_LIST libs_in_this_project)
+      LIST(APPEND _libs_suffixed "${f}${lib_type_suffix}")
+    else()
+      LIST(APPEND _libs_suffixed "${f}")
+    endif()
+  ENDFOREACH(f)
+  _TARGET_LINK_LIBRARIES(${_libs_suffixed})
+endfunction()
+function(INSTALL)
+  SET(_install_args "")
+  FOREACH(f ${ARGN})
+    if (${f} IN_LIST libs_in_this_project)
+      LIST(APPEND _install_args "${f}${lib_type_suffix}")
+    else()
+      LIST(APPEND _install_args "${f}")
+    endif()
+  ENDFOREACH(f)
+  _INSTALL(${_install_args})
+endfunction()
+
+
+
+
+
+
+
+
+
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
 cmake_policy(SET CMP0017 NEW)
 #this line has to appear before 'PROJECT' in order to be able to disable incremental linking
@@ -472,10 +549,10 @@ IF(INSTALL_LIBS)
 	SET(INCLUDE_INSTALL_DIR "include/bullet/" CACHE PATH "The subdirectory to the header prefix")
 	SET(PKGCONFIG_INSTALL_PREFIX "lib${LIB_SUFFIX}/pkgconfig/" CACHE STRING "Base directory for pkgconfig files")
 	IF(NOT MSVC)
-	  CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/bullet.pc.cmake ${CMAKE_CURRENT_BINARY_DIR}/bullet.pc @ONLY)
+	  CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/bullet.pc.cmake ${CMAKE_CURRENT_BINARY_DIR}/bullet${lib_type_suffix}.pc @ONLY)
   	INSTALL(
 		FILES
-		${CMAKE_CURRENT_BINARY_DIR}/bullet.pc
+		${CMAKE_CURRENT_BINARY_DIR}/bullet${lib_type_suffix}.pc
 		DESTINATION
 		${PKGCONFIG_INSTALL_PREFIX})
 	ENDIF(NOT MSVC)
Index: bullet/bullet.pc.cmake
===================================================================
--- bullet.orig/bullet.pc.cmake
+++ bullet/bullet.pc.cmake
@@ -7,5 +7,5 @@ Name: bullet
 Description: Bullet Continuous Collision Detection and Physics Library
 Version: @BULLET_VERSION@
 Requires:
-Libs: -L${libdir} -lBulletSoftBody -lBulletDynamics -lBulletCollision -lLinearMath
+Libs: -L${libdir} -lBulletSoftBody@lib_type_suffix@ -lBulletDynamics@lib_type_suffix@ -lBulletCollision@lib_type_suffix@ -lLinearMath@lib_type_suffix@
 Cflags: @BULLET_DOUBLE_DEF@ -I${includedir} -I${prefix}/include