cmake : add an option to use libtcmlloc (a faster malloc implementation

than glibc)

CMakeLists.txt

@@ -83,6 +83,7 @@ opt(SGEOM "Enable SGEOM interface to OCC (experimental)" OFF)
 opt(SLEPC "Enable SLEPc eigensolvers (required for conformal compounds)" ${DEFAULT})
 opt(SOLVER "Enable built-in finite element solvers (required for compounds)" ${DEFAULT})
 opt(TAUCS "Enable Taucs linear solver (alternative to PETSc)" ${DEFAULT})
+opt(TCMALLOC "Enable libtcmalloc, a fast malloc implementation but that does not release memory" OFF)
 opt(TETGEN "Enable Tetgen 3D initial mesh generator" ${DEFAULT})
 opt(TETGEN_OLD "Enable older version of Tetgen" OFF)
 opt(VORO3D "Enable Voro3D (for hex meshing, experimental)" ${DEFAULT})
@@ -389,6 +390,14 @@ if(ENABLE_BLAS_LAPACK)
   endif(BLAS_LAPACK_LIBRARIES)
 endif(ENABLE_BLAS_LAPACK)
 
+if(ENABLE_TCMALLOC)
+  find_library(TCMALLOC tcmalloc)
+  if(TCMALLOC)
+    set_config_option(HAVE_TCMALLOC "TCMalloc")
+    list(APPEND EXTERNAL_LIBRARIES ${TCMALLOC})
+  endif(TCMALLOC)
+endif(ENABLE_TCMALLOC)
+
 add_subdirectory(Common)
 add_subdirectory(Numeric)
 add_subdirectory(Geo)