doc: put doxygen log file in build directory

The meson documentation states that projects should not rely upon the
custom_target build commands are run from any given directory.  Therefore,
rather than writing the standout output from doxygen to the current
directory - which could be anywhere in future, put it into the api
directory, so that it is in a known location.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

diff --git a/doc/api/generate_doxygen.sh b/doc/api/generate_doxygen.sh
index b4d66eb..1350e50 100755 (executable)
--- a/doc/api/generate_doxygen.sh
+++ b/doc/api/generate_doxygen.sh
@@ -6,8 +6,10 @@ DOXYCONF=$1
 OUTDIR=$2
 SCRIPTCSS=$3
 
+OUT_FILE=$(dirname $OUTDIR)/doxygen.out
+
 # run doxygen, capturing all the header files it processed
-doxygen "${DOXYCONF}" > doxygen.out
-echo "$OUTDIR: $(awk '/Preprocessing/ {printf("%s ", substr($2, 1, length($2) - 3))}' doxygen.out)" > $OUTDIR.d
+doxygen "${DOXYCONF}" > $OUT_FILE
+echo "$OUTDIR: $(awk '/Preprocessing/ {printf("%s ", substr($2, 1, length($2) - 3))}' $OUT_FILE)" > $OUTDIR.d
 
 "${SCRIPTCSS}" "${OUTDIR}"/doxygen.css