libavutil: Make avpriv_open a library-internal function on msvcrt

Add one copy of the function into each of the libraries, similarly
to what we do for log2_tab. When using static libs, only one
copy of the file_open.o object file gets included, while when
using shared libraries, each of them get a copy of its own.

This fixes DLL builds with a statically linked C runtime, where
each DLL effectively has got its own instance of the C runtime,
where file descriptors can't be shared across runtimes.

On systems not using msvcrt, the function is not duplicated.

Signed-off-by: Martin Storsjö <martin@martin.st>

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index fc1bfb2..318ed7d 100644 (file)
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -26,6 +26,8 @@ OBJS = allcodecs.o                                                      \
        raw.o                                                            \
        utils.o                                                          \
 
+OBJS-$(HAVE_MSVCRT) += file_open.o
+
 # parts needed for many different codecs
 OBJS-$(CONFIG_AANDCTTABLES)            += aandcttab.o
 OBJS-$(CONFIG_AC3DSP)                  += ac3dsp.o

diff --git a/libavcodec/file_open.c b/libavcodec/file_open.c
new file mode 100644 (file)
index 0000000..494a5d3
--- /dev/null
+++ b/libavcodec/file_open.c
@@ -0,0 +1 @@
+#include "libavutil/file_open.c"

diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index 76d11c1..8fdae2d 100644 (file)
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -7,6 +7,8 @@ HEADERS = avdevice.h                                                    \
 OBJS    = alldevices.o                                                  \
           avdevice.o                                                    \
 
+OBJS-$(HAVE_MSVCRT) += file_open.o
+
 # input/output devices
 OBJS-$(CONFIG_ALSA_INDEV)                += alsa-audio-common.o \
                                             alsa-audio-dec.o

diff --git a/libavdevice/file_open.c b/libavdevice/file_open.c
new file mode 100644 (file)
index 0000000..494a5d3
--- /dev/null
+++ b/libavdevice/file_open.c
@@ -0,0 +1 @@
+#include "libavutil/file_open.c"

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 5e2dd2a..0b788c9 100644 (file)
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -23,6 +23,8 @@ OBJS = allformats.o         \
        url.o                \
        utils.o              \
 
+OBJS-$(HAVE_MSVCRT) += file_open.o
+
 OBJS-$(CONFIG_NETWORK)                   += network.o
 OBJS-$(CONFIG_RIFFDEC)                   += riffdec.o
 OBJS-$(CONFIG_RIFFENC)                   += riffenc.o

diff --git a/libavformat/file_open.c b/libavformat/file_open.c
new file mode 100644 (file)
index 0000000..494a5d3
--- /dev/null
+++ b/libavformat/file_open.c
@@ -0,0 +1 @@
+#include "libavutil/file_open.c"

diff --git a/libavutil/internal.h b/libavutil/internal.h
index 355a42a..b18860f 100644 (file)
--- a/libavutil/internal.h
+++ b/libavutil/internal.h
@@ -196,6 +196,10 @@ void avpriv_report_missing_feature(void *avc,
 void avpriv_request_sample(void *avc,
                            const char *msg, ...) av_printf_format(2, 3);
 
+#if HAVE_MSVCRT
+#define avpriv_open ff_open
+#endif
+
 /**
  * A wrapper for open() setting O_CLOEXEC.
  */