在Ubuntu Linux下创建使用GSL函数库的工程

在Ubuntu Linux下创建使用GSL函数库的工程

GSL是一个开源的，用C／C++写成的数学函数库，非常流行也非常实用。

我们用cmake 创建 Makefile 文件，熟悉cmake的朋友应该知道，cmake可以直接产生MS studio， Eclipse，QT 等开发环境的工程文件。这里我们产生通用的Makfile文件。

Ubuntu 14.04 下载、安装、配置的相关知识

Ubuntu 14.04系统下载地址：

Windows 7下硬盘安装Ubuntu 14.04图文教程

1. 在Ubuntu Linux下安装GSL：
  打开Synaptic Package Manager， 安装libgsl0-dev 和libgsl0ldbl

2.  创建FindGSL.cmake 文件，然后将FindGSL.cmake 移动到 "/usr/share/cmake-2.8/Modules"
COMMENTS: .cmake文件很重要，是CMakeLists.txt中findpackage命令的基础，如果没有Find*.cmake文件，在cmake执行findpackage命令是会报错的。

---------------------------------------------------------------------------------------

# Try to find gnu scientific library GSL
# See
# http://www.gnu.org/software/gsl/  and
# http://gnuwin32.sourceforge.net/packages/gsl.htm
#
# Once run this will define:
#
# GSL_FOUND      = system has GSL lib
#
# GSL_LIBRARIES  = full path to the libraries
#    on Unix/Linux with additional linker flags from "gsl-config --libs"
#
# CMAKE_GSL_CXX_FLAGS  = Unix compiler flags for GSL, essentially "`gsl-config --cxxflags`"
#
# GSL_INCLUDE_DIR      = where to find headers
#
# GSL_LINK_DIRECTORIES = link directories, useful for rpath on Unix
# GSL_EXE_LINKER_FLAGS = rpath on Unix
#
# Felix Woelk 07/2004
# Jan Woetzel
#
# www.mip.informatik.uni-kiel.de
# --------------------------------

IF(WIN32)
# JW tested with gsl-1.8, Windows XP, MSVS 7.1, MSVS 8.0
SET(GSL_POSSIBLE_ROOT_DIRS
${GSL_ROOT_DIR}
$ENV{GSL_ROOT_DIR}
${GSL_DIR}
${GSL_HOME}
$ENV{GSL_DIR}
$ENV{GSL_HOME}
$ENV{EXTERN_LIBS_DIR}/gsl
$ENV{EXTRA}
# "C:/home/jw/source2/gsl-1.8"
)
FIND_PATH(GSL_INCLUDE_DIR
NAMES gsl/gsl_cdf.h gsl/gsl_randist.h
PATHS ${GSL_POSSIBLE_ROOT_DIRS}
PATH_SUFFIXES include
DOC "GSL header include dir"
)

FIND_LIBRARY(GSL_GSL_LIBRARY
NAMES gsl libgsl
PATHS  ${GSL_POSSIBLE_ROOT_DIRS}
PATH_SUFFIXES lib
DOC "GSL library dir" )

FIND_LIBRARY(GSL_GSLCBLAS_LIBRARY
NAMES gslcblas libgslcblas
PATHS  ${GSL_POSSIBLE_ROOT_DIRS}
PATH_SUFFIXES lib
DOC "GSL cblas library dir" )

SET(GSL_LIBRARIES ${GSL_GSL_LIBRARY})

#MESSAGE("DBG\n"
#  "GSL_GSL_LIBRARY=${GSL_GSL_LIBRARY}\n"
#  "GSL_GSLCBLAS_LIBRARY=${GSL_GSLCBLAS_LIBRARY}\n"
#  "GSL_LIBRARIES=${GSL_LIBRARIES}")

 

ELSE(WIN32)

IF(UNIX)
SET(GSL_CONFIG_PREFER_PATH
 "$ENV{GSL_DIR}/bin"
 "$ENV{GSL_DIR}"
 "$ENV{GSL_HOME}/bin"
 "$ENV{GSL_HOME}"
 CACHE STRING "preferred path to GSL (gsl-config)")
FIND_PROGRAM(GSL_CONFIG gsl-config
 ${GSL_CONFIG_PREFER_PATH}
 /usr/bin/
 )
# MESSAGE("DBG GSL_CONFIG ${GSL_CONFIG}")

IF (GSL_CONFIG)

 MESSAGE(STATUS "GSL using gsl-config ${GSL_CONFIG}")
 # set CXXFLAGS to be fed into CXX_FLAGS by the user:
 EXEC_PROGRAM(${GSL_CONFIG}
  ARGS --cflags
  OUTPUT_VARIABLE  GSL_CXX_FLAGS )
 #SET(GSL_CXX_FLAGS "`${GSL_CONFIG} --cflags`")

 # set INCLUDE_DIRS to prefix+include
 EXEC_PROGRAM(${GSL_CONFIG}
  ARGS --prefix
  OUTPUT_VARIABLE GSL_PREFIX)
 SET(GSL_INCLUDE_DIR ${GSL_PREFIX}/include CACHE STRING INTERNAL)

 # set link libraries and link flags

 #SET(GSL_LIBRARIES "`${GSL_CONFIG} --libs`")

 # extract link dirs for rpath
 EXEC_PROGRAM(${GSL_CONFIG}
  ARGS --libs
  OUTPUT_VARIABLE  GSL_CONFIG_LIBS )
 SET(GSL_LIBRARIES "${GSL_CONFIG_LIBS}")

 # split off the link dirs (for rpath)
 # use regular expression to match wildcard equivalent "-L*"
 # with  is a space or a semicolon
 STRING(REGEX MATCHALL "[-][L]([^ ;])+"
  GSL_LINK_DIRECTORIES_WITH_PREFIX
  "${GSL_CONFIG_LIBS}" )
 #      MESSAGE("DBG  GSL_LINK_DIRECTORIES_WITH_PREFIX=${GSL_LINK_DIRECTORIES_WITH_PREFIX}")

 # remove prefix -L because we need the pure directory for LINK_DIRECTORIES

 IF (GSL_LINK_DIRECTORIES_WITH_PREFIX)
  STRING(REGEX REPLACE "[-][L]" "" GSL_LINK_DIRECTORIES ${GSL_LINK_DIRECTORIES_WITH_PREFIX} )
 ENDIF (GSL_LINK_DIRECTORIES_WITH_PREFIX)
 SET(GSL_EXE_LINKER_FLAGS "-Wl,-rpath,${GSL_LINK_DIRECTORIES}" CACHE STRING INTERNAL)
 #      MESSAGE("DBG  GSL_LINK_DIRECTORIES=${GSL_LINK_DIRECTORIES}")
 #      MESSAGE("DBG  GSL_EXE_LINKER_FLAGS=${GSL_EXE_LINKER_FLAGS}")

 #      ADD_DEFINITIONS("-DHAVE_GSL")
 #      SET(GSL_DEFINITIONS "-DHAVE_GSL")
 MARK_AS_ADVANCED(
  GSL_CXX_FLAGS
  GSL_INCLUDE_DIR
  GSL_LIBRARIES
  GSL_LINK_DIRECTORIES
  GSL_DEFINITIONS
)
 MESSAGE(STATUS "Using GSL from ${GSL_PREFIX}")

ELSE(GSL_CONFIG)

 INCLUDE(UsePkgConfig) #needed for PKGCONFIG(...)

 MESSAGE(STATUS "GSL using pkgconfig")
 #      PKGCONFIG(gsl includedir libdir linkflags cflags)
 PKGCONFIG(gsl GSL_INCLUDE_DIR GSL_LINK_DIRECTORIES GSL_LIBRARIES GSL_CXX_FLAGS)
 IF(GSL_INCLUDE_DIR)
MARK_AS_ADVANCED(
    GSL_CXX_FLAGS
    GSL_INCLUDE_DIR
    GSL_LIBRARIES
    GSL_LINK_DIRECTORIES
)

 ELSE(GSL_INCLUDE_DIR)
MESSAGE("FindGSL.cmake: gsl-config/pkg-config gsl not found. Please set it manually. GSL_CONFIG=${GSL_CONFIG}")
 ENDIF(GSL_INCLUDE_DIR)

ENDIF(GSL_CONFIG)

ENDIF(UNIX)
ENDIF(WIN32)

 

IF(GSL_LIBRARIES)
IF(GSL_INCLUDE_DIR OR GSL_CXX_FLAGS)

SET(GSL_FOUND 1)

ENDIF(GSL_INCLUDE_DIR OR GSL_CXX_FLAGS)
ENDIF(GSL_LIBRARIES)

 

# ==========================================
IF(NOT GSL_FOUND)
# make FIND_PACKAGE friendly
IF(NOT GSL_FIND_QUIETLY)
IF(GSL_FIND_REQUIRED)
 MESSAGE(FATAL_ERROR "GSL required, please specify it's location.")
ELSE(GSL_FIND_REQUIRED)
 MESSAGE(STATUS      "ERROR: GSL was not found.")
ENDIF(GSL_FIND_REQUIRED)
ENDIF(NOT GSL_FIND_QUIETLY)
ENDIF(NOT GSL_FOUND)

-----------------------------------------------------------------------------------------

3. 准备工作做完，下面开始创建我们自己的程序。
创建hello.c
-----------------------------------------------
#include 
#include 
 int main (void) 
{ 
 double x = 5.0; 
 double y = gsl_sf_bessel_J0 (x); 
 printf ("J0(%g) = %.18e\n", x, y); 
 return 0; 
}
-----------------------------------------------
创建CMakeLists.txt
-----------------------------------------------------

cmake_minimum_required (VERSION 2.8)
project(hello)
 
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}")
 
find_package(GSL REQUIRED)
include_directories(${GSL_INCLUDE_DIRES} ${GSLCBLAS_INCLUDE_DIRS})
link_libraries(${GSL_LIBRARIES} ${GSLBLAS_LIBRARIES})
 
target_link_libraries (${GSL_LIBRARIES} ${GSLBLAS_LIBRARIES})
add_executable(hello hello.c)
-----------------------------------------------------
cmake . && make

就会产生可执行文件 “hello”