Allow unusual ways of specifying compiler output file

Some compilers do not use the typical -c -o foo.o style.
This allows compiler-specific equivalents to be set by the
configure script.

Originally committed as revision 19409 to svn://svn.ffmpeg.org/ffmpeg/trunk

common.mak

@@ -21,7 +21,7 @@ ALLFFLIBS = avcodec avdevice avfilter avformat avutil postproc swscale
 CPPFLAGS += -DHAVE_AV_CONFIG_H -I$(BUILD_ROOT_REL) -I$(SRC_PATH)
 
 %.o: %.c
-	$(CC) $(CPPFLAGS) $(CFLAGS) $(LIBOBJFLAGS) -c -o $@ $<
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LIBOBJFLAGS) -c $(CC_O) $<
 
 %.o: %.S
 	$(AS) $(CPPFLAGS) $(CFLAGS) $(LIBOBJFLAGS) -c -o $@ $<

configure

@@ -1263,6 +1263,8 @@ SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
 SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
 LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
 
+CC_O='-o $@'
+
 host_cflags='-O3 -g -Wall'
 host_libs='-lm'
 
@@ -2493,6 +2495,7 @@ enabled stripping &&
 
 echo "CPPFLAGS?=$CPPFLAGS" >> config.mak
 echo "CFLAGS=$CFLAGS" >> config.mak
+echo "CC_O=$CC_O" >> config.mak
 echo "LDFLAGS=$LDFLAGS" >> config.mak
 echo "FFSERVERLDFLAGS=$FFSERVERLDFLAGS" >> config.mak
 echo "SHFLAGS=$SHFLAGS" >> config.mak