链接到外部库(NLopt)

Question

在构建链接到NLopt库(http://ab-initio.mit.edu/wiki/index.php/NLopt)的Rcpp包方面，我需要一些帮助。

我在Windows上使用RStudio的“Build&Reload”。

包的\src文件夹中有以下文件：

• src
  • Makevars.in
  • Makevars.win
  • RcppExports.cpp
  • nlopt.h
  • nlopt.hpp
  • libnlopt.lib
  • libnlopt.def
  • libnlopt.a
  • libnlopt.dll

​

在这里，我将.lib (使用MinGW构建)和dll文件复制到\src文件夹中，希望R能够自己编译它们。然而，情况似乎并非如此，为此，我添加了一个Makevars文件，尝试链接到库。

在从RStudio运行时，我会收到以下错误消息，我猜想，它告诉我链接存在问题(cf )。)对NLop库的“未定义引用”：

安装到库‘C:/Users/g 49128/Documents/R/win- library /3.2’ 安装源代码包“NewPackage”. ** lib g++ -m64 -shared -s -libgcc -o NewPackage.dll tmp.def RcppExports.o Rcpp_project_test.o -Lc:/Temp/R/Rcpp/NewPackage/src/libnlopt.a -LC:/application/extsoft/lib/x64-LC:/application/extsoft/lib -LC:/PROGRA~1/R/R-32~1.2/bin/x64 -lR -lR未定义为`__imp_nlopt_create‘

因此，我怀疑我没有正确的马克瓦尔斯，不太熟悉这些。

通过查阅几个CRAN包，特别是nloptr，我目前对两个Makevars文件的内容的最佳猜测是：

NLOPT_HOME = c:/Temp/R/Rcpp/NewPackage/src。 KG_CFLAGS = -I"$(NLOPT_HOME)“ PKG_LIBS = -L"$(NLOPT_HOME)/libnlopt.a“

其中'libnlopt.a‘是库，环境变量'NLOPT_HOME’保存到库的路径。

有人能告诉我我在这里错过了什么吗？任何帮助都将不胜感激，谢谢。

Answer 1

非洛普包本身能够可靠地做到这一点。它使用以下Makevars.win

# Copyright (C) 2010 Jelmer Ypma. All Rights Reserved.
# This code is published under the L-GPL.
#
# File:   Makevars.win
# Author: Jelmer Ypma
# Date:   18 August 2010
#
# 09 June 2011: Windows support added thanks to Stefan Theussl and Uwe Ligges.
#               NLOPT_HOME is the directory where a working installation of 
#               NLopt is located (within subdirectories NLOPT_VERSION/R_ARCH)
# 18 November 2011: Removed NLOPT_VERSION macro and adopted some other changes
#                   proposed by Brian Ripley to make nloptr work with his new toolchain.
#                   NLopt should now be located in NLOPT_HOME/R_ARCH (i.e. without
#                   version number)
# 19 February 2013: NLopt is compiled with --with-cxx option, in order to include
#                   the StoGo algorithm. This means that we now need to link to 
#                   with -lnlopt_cxx and also link to the c++ library, -lstdc++.
# 7 November 2013: Changed PKG_CPPFLAGS to PKG_CFLAGS.
# 2 May 2014: Added quotes around include paths to allow for spaces in NLOPT_HOME.

# C Compiler options
PKG_CFLAGS = -I"$(NLOPT_HOME)$(R_ARCH)/include"
PKG_LIBS = -L"$(NLOPT_HOME)$(R_ARCH)/lib" -lnlopt_cxx

要求您拥有正确的NLOPT_HOME变量集。

您有时可以从CRAN支持站点下载相应的预构建库，但我在这里没有看到这一点。