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由 John Bowler 提交于
1) Added the 'compile' program to the list of programs that must be cleaned in autogen.sh 2) Added 'subdir-objects' which causes .c files in sub-directories to be compiled such that the corresponding .o files are also in the sub-directory. This is because automake 1.14 warns that the current behavior of compiling to the top level directory may be removed in the future. 3) Updated dependencies on pnglibconf.h to match the new .o locations and added all the files in contrib/libtests and contrib/tools that depend on pnglibconf.h 4) Added 'BUILD_SOURCES = pnglibconf.h'; this is the automake recommended way of handling the dependencies of sources that are machine generated; unfortunately it only works if the user does 'make all' or 'make check', so the dependencies (3) are still required.
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