Ubuntu上用premake编译GDAL

GDAL的编译脚本呈现出不同平台不同解决方案的百花齐放现状。我是从windows平台开始编译GDAL的，用的自然是nmake。那就是一种每个目录下都需要写makefile文件的构建方法，写的人麻烦，我因为要定制，也是不甚其烦。

基于前文：premake 在64位Ubuntu系统下编译32位GCC程序的基础，我在Ubuntu上构建了premake脚本，可以编译出debug64, debug32, release64和releae32的gdal动态和静态库。由于我所用的gdal是定制版本的，可能有所不同，下面的共参考。

创建一个config.lua脚本文件，内容如下：

-- A solution contains projects, and defines the available configurations
solution ("gdal")
configurations {"Debug64","Release64", "Debug32", "Release32"}
location "build"
includedirs
{
   "/usr/src/linux-headers-3.8.0-30-generic/include/config/pci/",
   "/usr/include/x86_64-linux-gnu/c++/4.8"
}

configuration "Debug64"
targetdir "output/linux_debug_x64"
defines
{
   "DEBUG",
   "HAVE_SSE_AT_COMPILE_TIME"
}

flags {"Symbols"}

configuration "Debug32"
targetdir "output/linux_debug_x32"
defines
{
   "DEBUG",
   "HAVE_SSE_AT_COMPILE_TIME"
}

buildoptions {"-m32"}
linkoptions {"-m32"}
flags {"Symbols"}

configuration "Release64"
targetdir "output/linux_release_x64"
defines
{
   "NDEBUG",
   "HAVE_SSE_AT_COMPILE_TIME"
}

flags {"OptimizeSize"}

configuration "Release32"
targetdir "output/linux_release_x32"
defines
{
   "NDEBUG",
   "HAVE_SSE_AT_COMPILE_TIME"
}

buildoptions {"-m32"}
linkoptions {"-m32"}
flags {"OptimizeSize"}

-- project port defines one build target
p = project("port")
basedir(p.name)
location("build/" .. p.name)
kind "SharedLib"
language "C++"
files { p.name .. "/*.h", p.name .. "/*.cpp" }

excludes 
{
   p.name .. "/cpl_vsil_stdout.cpp",
   p.name .. "/cpl_odbc.cpp",
   p.name .. "/cpl_win32ce_api.cpp",
   p.name .. "/cpl_vsil_simple.cpp",
   p.name .. "/cpl_vsil_win32.cpp",
   p.name .. "/cpl_vsil_gzip.cpp",
   p.name .. "/cpl_vsil_buffered_reader.cpp",
   p.name .. "/cpl_minizip_zip",
   p.name .. "/cpl_minizip_zip.cpp",
   p.name .. "/cpl_minizip_unzip.cpp",
   p.name .. "/xmlreformat.cpp",
   p.name .. "/cpl_vsil_tar.cpp",
   p.name .. "/cpl_quad_tree.cpp",
   p.name .. "/cpl_vsil_readahead_reader.cp",
   p.name .. "/cpl_google_oauth2.cpp",
   p.name .. "/cpl_vsil_curl.cpp",
   p.name .. "/cpl_vsil_curl_streaming.cpp",
   p.name .. "/cpl_minizip_ioapi.cpp",
   p.name .. "/cpl_vsil_abstract_archive.cpp",
   p.name .. "/cpl_vsil_cache.cpp",
   p.name .. "/cpl_spawn.cpp"
}

includedirs 
{
   "./port", 
   "./ogr", 
   "./gcore", 
   "./alg",
   "./ogr/ogrsf_frmts",
   "./frmts/zlib"
}

-- project ogr defines one build target
p = project("ogr")
basedir(p.name)
location("build/" .. p.name)
-- build .a here because nmake generats ogr.lib
kind "StaticLib"
language "C++"
files
{
   p.name .. "/*.c",
   p.name .. "/*.cpp"
}

excludes
{
   p.name .. "/ogrlinearring.cpp",
   p.name .. "/ogrutils.cpp",
   p.name .. "/ogr2gmlgeometry.cpp",
   p.name .. "/ogrmultipoint.cpp",
   p.name .. "/ogrmultipolygon.cpp",
   p.name .. "/ogrfeaturestyle.cpp",
   p.name .. "/swq_op_registrar.cpp",
   p.name .. "/ogr_api.cpp",
   p.name .. "/ogrsurface.cpp",
   p.name .. "/ogrfielddefn.cpp",
   p.name .. "/ogr_opt.cpp",
   p.name .. "/ogrmultilinestring.cpp",
   p.name .. "/ogrfeature.cpp",
   p.name .. "/swq.cpp",
   p.name .. "/ogrgeometrycollection.cpp",
   p.name .. "/ogrcurve.cpp",
   p.name .. "/gml2ogrgeometry.cpp",
   p.name .. "/ograssemblepolygon.cpp",
   p.name .. "/ogrfeaturequery.cpp",
   p.name .. "/ogrgeometry.cpp",
   p.name .. "/swq_op_general.cpp",
   p.name .. "/ogrgeometryfactory.cpp",
   p.name .. "/ogrlinestring.cpp",
   p.name .. "/swq_parser.cpp",
   p.name .. "/ogrpolygon.cpp",
   p.name .. "/swq_select.cpp",
   p.name .. "/swq_expr_node.cpp",
   p.name .. "/ogrpoint.cpp",
   p.name .. "/ogrfeaturedefn.cpp",
}

includedirs 
{
   "./port", 
   "./ogr", 
   "./gcore", 
   "./alg",
   "./ogr/ogrsf_frmts",
   "./ogrsf_frmts",
   "./frmts/gtiff/libgeotiff"
}

-- project ogr defines one build target
p = project("gcore")
basedir(p.name)
location("build/" .. p.name)
kind "SharedLib"
language "C++"
files { p.name .. "/*.h", p.name .. "/*.cpp" }

excludes
{
   p.name .. "/gdaljp2metadata.cpp",
   p.name .. "/gdaljp2box.cpp",
   p.name .. "/gdalgmlcoverage.cpp"
}

includedirs 
{
   "./port", 
   "./ogr", 
   "./gcore", 
   "./alg",
   "./ogr/ogrsf_frmts",
   "./ogrsf_frmts",
   "./frmts/gtiff"
}

-- project frmts defines one build target
-- After this last project build is finished, then link all obj and libs to library
p = project("frmts")
basedir(p.name)
location("build/" .. p.name)
kind "SharedLib"
language "C++"
files 
{
   p.name .. "/*.cpp",
   p.name .. "/jpeg/*.cpp",
   p.name .. "/jpeg/*.c",
   p.name .. "/nitf/*.cpp",
   p.name .. "/nitf/*.c",
   p.name .. "/gtiff/*.cpp",
   p.name .. "/gtiff/*.c",
   p.name .. "/gtiff/libtiff/*.c",
   p.name .. "/gtiff/libgeotiff/*.c",
   p.name .. "/jpeg/*.cpp",
   p.name .. "/jpeg/*.c",
   p.name .. "/dted/*.cpp",
   p.name .. "/dted/*.c",
   p.name .. "/zlib/*.cpp",
   p.name .. "/zlib/*.c"
}

excludes
{
   p.name .. "/nitf/rpftocdataset.cpp",
   p.name .. "/nitf/nitfdump.c",
   p.name .. "/dted/dted_test.c",
   p.name .. "/dted/dteddataset.cpp",
   p.name .. "/gtiff/libtiff/tif_print.c",
   p.name .. "/gtiff/libgeotiff/geo_trans.c",
   p.name .. "/zlib/gzio.c"
}

includedirs 
{
   "./port", 
   "./ogr", 
   "./gcore", 
   "./alg",
   "./ogr/ogrsf_frmts",
   "./frmts/zlib",
   "./frmts/jpeg/libjpeg",
   "./frmts/gtiff/libtiff",
   "./frmts/vrt",
   "./frmts/gtiff/libgeotiff",
   "./frmts/jpeg/jpeg-8c"
}

defines
{
   "FRMT_nitf",
   "DFRMT_gtiff",
   "FRMT_jpeg",
   "FRMT_dted",
   "FRMT_zlib"
}

整个设计是用一个solution包含四个project,分别对应GDAL的port, ogr, gcore和frmts目录下的代码。premake会自动为每个项目build出动态或者静态库。但是premake4还没有办法在编译时知道自己的configuration是什么（这个功能要到premake5.0才有）。为了弥补这个缺憾，我写了四个脚本，分别在最后将所有的*.o和*.a文件link成libgdal.so和libgdal.a文件。

比如rebuild_linxu_debug_32.sh文件，

export CXX=clang++
export CC=clang
rm -rf build
rm -rf output/linux_debug_x32
../../../depfiles/build/linux/premake4 --file=config.lua gmake
cd build
make config=debug32
cd -
$CXX -o output/linux_debug_x32/libgdal.so build/port/obj/Debug32/*.o output/linux_debug_x32/libogr.a build/gcore/obj/Debug32/*.o build/frmts/obj/Debug32/*.o -m32 -shared
ar -rcs output/linux_debug_x32/libgdal.a build/port/obj/Debug32/*.o output/linux_debug_x32/libogr.a build/gcore/obj/Debug32/*.o build/frmts/obj/Debug32/*.o

这里可以看到，我用的是clang编译器，去掉开头两行，就变成了gcc了。其他脚本类似。

最后有一个rebuild.sh脚本，编译出所有的版本。

rm -rf output
./rebuild_linux_debug_64.sh
./rebuild_linux_release_64.sh
./rebuild_linux_debug_32.sh
./rebuild_linux_release_32.sh

就在顶层目录下搞定，再也不需要维护那么多makefile了。