integrate jemalloc into cmake build

well that was painful

CMakeLists.txt

@@ -25,7 +25,8 @@ if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
         endif()
     endif()
 
-    execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
+    execute_process(
+        COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
         WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
         OUTPUT_VARIABLE neo_GIT_REVISION
         ERROR_QUIET
@@ -36,6 +37,8 @@ if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
     endif()
 endif()
 
+include(./contrib/jemalloc.cmake)
+
 add_subdirectory(src)
 
 add_subdirectory(demo)

contrib/jemalloc.cmake

@@ -0,0 +1,35 @@
+# See the end of this file for copyright and license terms.
+
+set(JEMALLOC_SRCDIR "${CMAKE_SOURCE_DIR}/contrib/jemalloc")
+set(JEMALLOC_PREFIX "${CMAKE_BINARY_DIR}/contrib/jemalloc")
+
+include(ExternalProject)
+ExternalProject_Add(
+    libjemalloc
+    SOURCE_DIR ${JEMALLOC_SRCDIR}
+    TMP_DIR ${JEMALLOC_PREFIX}
+    STAMP_DIR ${JEMALLOC_PREFIX}
+    CONFIGURE_COMMAND ${JEMALLOC_SRCDIR}/autogen.sh --without-export --enable-static --disable-cxx --srcdir ${JEMALLOC_SRCDIR} --prefix=${JEMALLOC_PREFIX} --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
+    PREFIX ${JEMALLOC_SRCDIR}
+    BUILD_COMMAND make build_lib_static
+    BUILD_IN_SOURCE 1
+    BUILD_BYPRODUCTS ${JEMALLOC_PREFIX}/lib/libjemalloc.a
+)
+
+add_library(jemalloc STATIC IMPORTED GLOBAL)
+add_dependencies(jemalloc libjemalloc)
+set_property(
+    TARGET jemalloc
+    PROPERTY IMPORTED_LOCATION ${JEMALLOC_PREFIX}/lib/libjemalloc.a
+)
+
+# This file is part of libneo.
+# Copyright (c) 2021 Fefie <owo@fef.moe>.
+#
+# libneo is non-violent software: you may only use, redistribute,
+# and/or modify it under the terms of the CNPLv6+ as found in
+# the LICENSE file in the source code root directory or at
+# <https://git.pixie.town/thufie/CNPL>.
+#
+# libneo comes with ABSOLUTELY NO WARRANTY, to the extent
+# permitted by applicable law.  See the CNPLv6+ for details.

src/CMakeLists.txt

@@ -5,6 +5,8 @@ add_library(neo)
 add_compile_options(-nostdlib -nodefaultlibs)
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -nostdlib")
 
+target_link_libraries(neo PRIVATE jemalloc)
+
 configure_file(
     ./include/neo/buildconfig.h.in
     ${CMAKE_BINARY_DIR}/include/neo/buildconfig.h