Mercurial > ecos
annotate README.host @ 2925:7cbaadc92c67
* services/objloader/current/src/objloader.c,
services/objloader/current/src/objelf.c
services/objloader/current/include/objelf.h: Fixed a memory leak where a
library section was loaded but memory allocated was not released. This
bug was reported by Davy Wouters on the eCos list. Added minor cosmetics
and a number of CYG_ASSERT and if() to test the values returned by
cyg_ldr_load_elf_section()
* services/objloader/current/cdl/objloader.cdl: Eliminate workarounds for
file path handling issue in obsolete Cygwin tclsh. Use ACTUAL_CFLAGS for
robustness.
* fs/rom/current/cdl/romfs.cdl: Eliminate workarounds for file path handling
issue in obsolete Cygwin tclsh. Build the mk_romfs tool with higher
priority than the custom rules which use it.
| author | jld |
|---|---|
| date | Fri, 09 Oct 2009 13:53:09 +0000 |
| parents | 87c2e2ce3904 |
| children |
| rev | line source |
|---|---|
| 290 | 1 eCos Host-side Software |
| 2 ======================= | |
| 3 | |
| 4 This README file only describes the eCos host-side software. For | |
| 5 details of the eCos target-side software or the required toolchains, | |
| 6 please see other documentation. A good starting point is | |
| 2538 | 7 http://sourceware.com/ecos |
| 290 | 8 |
| 9 There are two categories of host-side software. The host subdirectory | |
| 10 contains generic software, primarily related to the eCos configuration | |
| 11 technology. All eCos users will need to use some of this technology to | |
| 12 configure and build eCos, either using pre-built binaries or by | |
| 13 building the host-side software from source. The generic software | |
| 14 should be portable to a wide range of host platforms. | |
| 15 | |
| 16 There is also package-specific host-side software. Much of this is I/O | |
| 17 related. For example the generic USB-slave package contains some | |
| 18 programs related to testing; a test application is run on a target | |
| 19 with suitable USB slave-side hardware, and needs to interact with | |
| 20 another program running on the USB host; the latter is | |
| 21 package-specific host-side software and can be found in the | |
| 22 subdirectory packages/io/usb/slave. Code like this may have | |
| 23 significant platform dependencies and may only work on a single | |
| 24 platform or on a small number of platforms. There may also be | |
| 25 special requirements, for example it may be necessary to install some | |
| 26 programs suid root so that they have appropriate access to the | |
| 27 hardware. | |
| 28 | |
| 29 | |
| 30 The host subdirectory includes the following: | |
| 31 | |
| 32 infra/ | |
| 33 This is an implementation of the eCos infrastructure that can be | |
| 34 used on the host-side, and provides assertion, tracing and | |
| 35 testcase support. | |
| 36 | |
| 37 NOTE: the eCos infrastructure facilities are not especially | |
| 38 well-suited to host-side development, in particular they are not | |
| 39 C++-oriented. There are plans to remove the current infrastructure | |
| 40 completely and replace it with something more suitable. People | |
| 41 planning new projects should be aware of this, and may wish to | |
| 42 avoid using the current infrastructure. | |
| 43 | |
| 44 libcdl/ | |
| 45 The CDL library lies at the heart of the eCos configuration | |
| 46 technology. | |
| 47 | |
| 48 tools/configtool/ | |
| 49 The sources to the various configuration tools can be found here. | |
| 50 | |
| 51 tools/configtool/common/common/ | |
| 52 Contains sources related to makefile generation, shared by the | |
| 53 command line and graphical tools. | |
| 54 | |
| 55 tools/configtool/standalone/common/ | |
| 56 Contains the command line ecosconfig tool. | |
| 57 | |
| 58 tools/configtool/standalone/wxwin/ | |
| 59 Contains sources for the wxWindows-based, Linux and Windows graphical | |
| 2771 | 60 configuration tool. The Windows version is built with cygwin g++. |
| 290 | 61 |
| 62 tools/configtool/common/win32/ | |
| 63 tools/configtool/standalone/win32/ | |
| 64 Contains sources for the older, MFC-based, Windows-only graphical | |
| 2771 | 65 configuration tool. This can only be built with Visual C++. |
| 290 | 66 |
| 67 The two graphical configuration tools have their own build procedures, | |
| 2771 | 68 described in tools/configtool/standalone/wxwin/README.txt and |
| 290 | 69 tools/configtool/standalone/win32/ReadMe respectively. |
| 70 | |
| 71 Package-specific host-side code lives in the host subdirectory of the | |
| 72 appropriate package, for example packages/io/usb/slave/<version>/host. | |
| 73 Most packages only provide target-side code and hence will not have a | |
| 74 host subdirectory. Users can install various packages from a variety | |
| 75 of sources, and where a package does have host-side software the | |
| 76 package documentation should be consulted for further information. | |
| 77 | |
| 78 | |
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79 Installing on Linux, Other Unix Systems, and Cygwin |
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80 --------------------------------------------------- |
| 290 | 81 |
| 82 Both generic host-side software (infra, libcdl and ecosconfig) and | |
| 83 package-specific software can be built with the conventional | |
| 84 "configure/make/make install" sequence. However the code does not | |
| 85 conform fully to GNU coding standards so some operations such as "make | |
| 86 dist" are not supported. There is limited support for DejaGnu-based | |
| 87 testing. | |
| 88 | |
| 89 Much of the host-side software has a dependency on Tcl. This is not | |
| 90 supplied with the sources since many users will already have a | |
|
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91 suitable installation, for example it is shipped as standard with all |
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92 major Linux distributions. The generic host-side software should work |
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93 with any release of Tcl from 8.0 onwards. The package-specific |
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94 software requires a more recent version, 8.3 or later. If no suitable |
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95 Tcl installation is available then the configure step will still |
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96 succeed but some of the package-specific software will not be built. |
| 290 | 97 |
| 98 There are two main approaches to building the host-side software: | |
| 99 | |
| 100 1) build the generic and the package-specific code in one build tree. | |
| 101 This uses the top-level configure script. The script automatically | |
| 102 invokes the configure script in the main host subdirectory. In | |
| 103 addition it searches the packages hierarchy for host subdirectories | |
| 104 containing their own configure scripts and will invoke those. | |
| 105 | |
| 106 Note: the search for host subdirectories happens during configure | |
| 107 time, not during the make. If new packages with host-side code are | |
| 108 added to the repository then it will be necessary to re-run the | |
| 109 toplevel configure script. | |
| 110 | |
| 111 2) build the generic code in one build tree, using the configure | |
| 112 script in the toplevel's host subdirectory. Then build some or all | |
| 113 of the package-specific code in separate build trees, using the | |
| 114 configure scripts in each package's host subdirectory. | |
| 115 | |
| 116 The first approach is generally simpler. However some of the | |
| 117 package-specific code requires special installation, for example a | |
| 118 program may have to be installed suid root so that it has the right | |
| 119 privileges to access hardware, and hence the "make install" step has | |
| 120 to be run by the superuser. Also some of the package-specific code is | |
| 121 rather specialized and may be of no interest to many users. For | |
| 122 example, the USB testing code is only useful when developing | |
| 123 USB-based applications. Hence some users may prefer the second | |
| 124 approach, building just the generic code and a subset of the | |
| 125 package-specific code. | |
| 126 | |
| 127 It is necessary to use a separate build tree rather than build | |
| 128 directly in the source tree. This is enforced by the configure scripts. | |
| 129 | |
| 130 $ mkdir build | |
| 131 $ cd build | |
| 132 | |
| 133 The next step is to run the desired configure script. To build all | |
| 134 the host-side software this means the toplevel configure script: | |
| 135 | |
| 136 $ <path>/configure <args> | |
| 137 | |
| 138 Alternatively to build just the generic host-side software, use the | |
| 139 configure script in the host subdirectory. | |
| 140 | |
| 141 $ mkdir host | |
| 142 $ cd host | |
| 143 $ <path>/host/configure <args> | |
| 144 | |
| 145 Or, to build just one package's host-side code: | |
| 146 | |
| 147 $ mkdir -p packages/io/usb/slave/current/host | |
| 148 $ cd packages/io/usb/slave/current/host | |
| 149 $ <path>/packages/io/usb/slave/current/host/configure <args> | |
| 150 | |
| 151 (It is not actually necessary to use the same directory structure in | |
| 152 the build tree as in the source tree, but doing so can avoid | |
| 153 confusion). | |
| 154 | |
| 155 A list of all the command-line options can be obtained by running | |
| 156 "configure --help". The most important ones are as follows: | |
| 157 | |
| 158 1) --prefix. This can be used to specify the location of the install | |
| 159 tree, defaulting to /usr/local, so the ecosconfig program ends up | |
| 160 in /usr/local/bin/ecosconfig and the CDL library ends up in | |
| 161 /usr/local/lib/libcdl.a. If an alternative location is preferred | |
| 162 this can be specified with --prefix, for example: | |
| 163 | |
| 164 $ <path>/configure --prefix=/usr/local/ecos <args> | |
| 165 | |
| 166 2) --enable-debug. By default all assertions and tracing are disabled. | |
| 167 When debugging any of the generic host-side software these should | |
| 168 be enabled. Some package-specific code may not have any extra | |
| 169 debug support, in which case --enable-debug would be ignored. | |
| 170 | |
| 171 $ <path>/configure --enable-debug | |
| 172 | |
| 173 It is also possible to control most of the assertion and tracing | |
| 174 macros at a finer grain. This is intended mainly for use by the | |
| 175 developers. | |
| 176 | |
| 177 --disable-asserts disable all assertions | |
| 178 --disable-preconditions disable a subset of the assertions | |
| 179 --disable-postconditions disable a subset of the assertions | |
| 180 --disable-invariants disable a subset of the assertions | |
| 181 --disable-loopinvariants disable a subset of the assertions | |
| 182 --disable-tracing disable tracing | |
| 183 --disable-fntracing disable function entry/exit tracing | |
| 184 | |
| 185 3) --with-tcl=<path> | |
| 186 --with-tcl-version=<number> | |
| 2538 | 187 --with-tk=<path> |
| 290 | 188 |
| 189 The host-side tools have a dependency on Tcl, which is not supplied | |
| 190 with the sources because many people will already have a suitable | |
| 191 installation. Specifically it is necessary to have the header file | |
| 192 tcl.h and appropriate libraries such that -ltcl will work - this | |
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193 can involve either static or shared libraries. Some tools may require |
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194 Tk as well as Tcl. |
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195 |
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196 Unfortunately there is considerable variation in Tcl installations. |
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197 In theory all Tcl installations have a file tclConfig.sh which |
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198 defines exactly how to compile and link code that uses Tcl, and Tk |
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199 has a similar file tkConfig.sh. The eCos configure scripts look for |
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200 these files, first in $(prefix)/lib, then in /usr/lib. If the system |
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201 already has a Tcl installation in /usr then the configure script will |
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202 automatically find /usr/lib/tclConfig.sh and it is not necessary |
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203 to pass additional options when configuring the eCos host-side |
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204 software. Alternatively, if for example you have installed a more |
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205 recent version of Tcl/Tk in the same place that you want to install the |
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206 eCos software, e.g. /usr/local, then $(prefix)/lib/tclConfig.sh |
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207 will be read in. |
| 290 | 208 |
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209 It is also possible that a more recent version of Tcl has been installed |
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210 in a different location. For example, you may wish to install the eCos host |
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211 tools in /opt/ecos but use a version of Tcl installed in /usr/local. The |
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212 eCos configure scripts need to be told explicitly where to look for |
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213 the Tcl: |
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214 |
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215 $ <path>/configure --with-tcl=/usr/local ... |
| 290 | 216 |
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217 Some systems, for example Debian Linux 3.0, do not install tclConfig.sh |
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218 in /usr/lib because that makes it more difficult to have several different |
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219 versions of Tcl installed at the same time. Instead tclConfig.sh is found |
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220 in a versioned directory such as /usr/lib/tcl8.3. Since several versions |
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221 may be installed the desired one must be specified explicitly. |
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222 |
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223 $ <path>/configure --with-tcl-version=8.3 |
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224 |
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225 The --with-tcl and --with-tcl-version options are combined to give a search path: |
| 290 | 226 |
| 2538 | 227 <with-tcl>/lib/tclConfig.sh |
| 228 <with-tcl>/lib/tcl<vsn>/tclConfig.sh | |
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229 <prefix>/lib/tclConfig.sh |
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230 <prefix>/lib/tcl<vsn>/tclConfig.sh |
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231 /usr/lib/tclConfig.sh |
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232 /usr/lib/tcl<vsn>/tclConfig.sh |
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233 |
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234 If tclConfig.sh cannot be found in any of these places then it is assumed |
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235 that Tcl has not been properly installed and the eCos configure script will |
| 2538 | 236 fail. |
| 290 | 237 |
| 2538 | 238 To search for Tk the configure scripts use much the same rules as |
| 239 for Tcl. It is also possible to specify a path using the --with-tk | |
| 240 option, useful if for some reason Tk has been installed in a | |
| 241 different location from Tcl. There is no --with-tk-version: it is | |
| 242 assumed that the same version should be used for both Tcl and Tk. | |
| 290 | 243 |
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244 Again, the configure scripts must be able to find tkConfig.sh |
| 290 | 245 |
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246 Once tclConfig.sh and tkConfig.sh have been found and read in, the eCos |
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247 configure scripts should have all the information needed to compile and |
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248 link code that uses Tcl. First the location of key headers such as |
| 2538 | 249 <tcl.h> is needed. A tclConfig.sh file may define TCL_INCLUDE_SPEC |
| 250 or TCL_INC_DIR to give a specific location, otherwise the header | |
| 251 files should be in $(TCL_PREFIX)/include. If <tcl.h> cannot be | |
| 252 found then the eCos configure scripts will fail. | |
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253 |
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254 Next it is necessary to work out how to link applications with Tcl. This |
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255 information should be provided by a tclConfig.sh variable TCL_LIB_SPEC. |
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256 Unfortunately not all Tcl installations set this, for example the cygwin |
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257 Tcl 8.4 release. If TCL_LIB_SPEC is not defined then instead the |
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258 configure script will look for a library libtcl<vsn>.a, where <vsn> is |
| 2538 | 259 specified using --with-tcl-version, then for a library libtcl.a. |
| 260 tclConfig.sh may also list additional libraries in TCL_LIBS and | |
| 261 additional linker flags in TCL_LD_FLAGS. | |
| 262 | |
| 263 For Tk the relevant tkConfig.sh settings are TK_INCLUDE_SPEC or | |
| 264 TK_INC_DIR, TK_XINCLUDES, TK_LIB_SPEC, and TK_LIBS. | |
| 265 | |
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266 |
| 290 | 267 Following the configure step the build tree should be set up |
| 268 correctly. All that remains is the actual build and install: | |
| 269 | |
| 270 $ make | |
| 271 $ make install | |
| 272 | |
| 273 This should result in an ecosconfig executable, plus appropriate | |
| 274 libraries and header files. If the install prefix is a system | |
| 275 location, for example /usr/local/, then "make install" will normally | |
| 276 require root privileges. Also some of the package-specific software | |
| 277 has special installation requirements, for example programs that need | |
| 278 to be installed suid root, and this will also need root privileges. | |
| 279 | |
| 280 | |
| 281 Installing with Visual C++ | |
| 282 -------------------------- | |
| 283 | |
| 284 Under Windows it is possible to build the generic host-side software | |
| 285 (infra, libcdl and ecosconfig) with Visual C++ but this is deprecated. | |
| 286 Building with g++ under cygwin is preferred. | |
| 287 | |
| 288 It is still necessary to run the configure script and a suitable make | |
| 289 utility. That requires a shell and a Unix-like environment, as | |
| 290 provided by cygwin. The Visual C++ compiler cl.exe needs to be on the | |
| 291 shell's search path, and some environment variables such as INCLUDE | |
| 292 and LIB may need to be set to point at the Visual C++ installation - | |
| 293 the details may vary depending on the version of the compiler. Then | |
| 294 the configure command should be run like this: | |
| 295 | |
| 296 $ CC=cl CXX=cl <path>/host/configure <args> | |
| 297 | |
| 298 Note that the path should be a cygwin path: cygwin mount points are | |
| 299 accepted and forward slashes should be used. The various configure | |
| 300 scripts now detect that Visual C++ should be used, and adapt | |
| 301 accordingly. | |
| 302 | |
| 303 Depending on what cygwin mount points are set up, /usr/local may or | |
| 304 may not be an appropriate install location for VC++ applications. | |
| 305 If not, the install location should be specified with --prefix: | |
| 306 | |
| 307 $ CC=cl CXX=cl <path>/configure --prefix=<install-path> <args> | |
| 308 | |
| 309 It is also necessary to use the right version of Tcl. For a VC++ build | |
| 310 the cygwin release of Tcl should not be used. Instead a suitable | |
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311 prebuilt Tcl package can be obtained from http://www.tcl.tk/. |
| 290 | 312 It is necessary to tell the configure script where this has been |
| 313 installed, for example: | |
| 314 | |
| 315 $ CC=cl CXX=cl <path>/configure --prefix=<install-path> \ | |
| 316 --with-tcl=/cygdrive/d/local/scriptics/Tcl/tcl8.1 <args> | |
| 317 | |
| 318 The library name will be of the form tcl81.lib, and there will not be | |
| 319 a symbolic link from tcl.lib to the appropriate version. It will be | |
| 320 necessary to specify the Tcl version explicitly since the default | |
| 321 version is currently 8.0. | |
| 322 | |
| 323 $ CC=cl CXX=cl <path>/configure --prefix=<install-path> \ | |
| 324 --with-tcl=/d/local/scriptics/Tcl/tcl8.1 --with-tcl-version=81 <args> | |
| 325 | |
| 326 Following a successful configure, the tools can be built and installed | |
| 327 in the normal fashion: | |
| 328 | |
| 329 $ make | |
| 330 $ make install | |
| 331 | |
| 332 | |
| 333 More Information | |
| 334 ================ | |
| 335 | |
| 2538 | 336 Please see the eCos web site, http://sourceware.com/ecos/, for |
| 290 | 337 further details. This includes the FAQ, a form for reporting problems, |
| 338 and details of the various mailing lists | |
| 339 (http://sources.redhat.com/ecos/intouch.html) At the time of writing | |
| 340 there are no separate mailing lists for the eCos host-side sources, | |
| 2538 | 341 the main mailing list ecos-discuss@sourceware.com should be used |
| 290 | 342 instead. |
| 343 | |
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344 // ####ECOSDOCCOPYRIGHTBEGIN#### |
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345 // =============================================================== |
| 2771 | 346 // Copyright (C) 2000, 2001, 2002, 2009 Free Software Foundation, Inc. |
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347 // This material may be distributed only subject to the terms |
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348 // and conditions set forth in the Open Publication License, v1.0 |
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349 // or later (the latest version is presently available at |
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350 // http://www.opencontent.org/openpub/) |
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351 // Distribution of the work or derivative of the work in any |
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352 // standard (paper) book form is prohibited unless prior |
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353 // permission obtained from the copyright holder |
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354 // =============================================================== |
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355 // ####ECOSDOCCOPYRIGHTEND#### |