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If building libav with -MD in the cflags (for making the MSVC compiler generate code for using a dynamically linked libc), the system headers that declare strtod, snprintf and vsnprintf declare the functions as imported from a DLL. To hook up wrappers of our own for these functions, the function names are defined to avpriv_*, so that the calling code within libav calls the wrappers instead. Since these functions are declared to be imported from DLLs, the calling code expects to load them from DLL import function pointers (creating references to _imp__avpriv_strtod instead of directly to avpriv_strtod). If the libav libraries are not built as DLLs, no such function pointers (as the calling code expects) are created. The linker can fix this up automatically in some cases (producing warnings LNK4217 and LNK4049), if the object files are already included. By telling the linker to try to include those symbols (without the _imp prefix as the calling code ends up using), we get the object files included, so that the linker can do the automatic fixup. This is done via config.h, so that all (or at least most) of the object files in our libraries force including the compat files, to make sure they are included regardless of what files from our static libraries actually are included. Signed-off-by: Martin Storsjö <martin@martin.st> |
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| compat | ||
| doc | ||
| libavcodec | ||
| libavdevice | ||
| libavfilter | ||
| libavformat | ||
| libavresample | ||
| libavutil | ||
| libswscale | ||
| presets | ||
| tests | ||
| tools | ||
| .gitignore | ||
| arch.mak | ||
| avconv_filter.c | ||
| avconv_opt.c | ||
| avconv.c | ||
| avconv.h | ||
| avplay.c | ||
| avprobe.c | ||
| avserver.c | ||
| Changelog | ||
| cmdutils_common_opts.h | ||
| cmdutils.c | ||
| cmdutils.h | ||
| common.mak | ||
| configure | ||
| COPYING.GPLv2 | ||
| COPYING.GPLv3 | ||
| COPYING.LGPLv2.1 | ||
| COPYING.LGPLv3 | ||
| CREDITS | ||
| INSTALL | ||
| library.mak | ||
| LICENSE | ||
| Makefile | ||
| README | ||
| RELEASE | ||
| version.sh | ||
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.