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
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。
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# Try to find gnu scientific library GSL
# See
# and
#
#
# 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
#
#
# --------------------------------
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}")