alter targets slightly in pdf makefile

diff --git a/openpower/Makefile b/openpower/Makefile
index 1635d93a542ea92dcc2af41a058640eb80cfb3d5..450bf9511f5fc12e98abeb35ced5e642be373852 100755 (executable)
--- a/openpower/Makefile
+++ b/openpower/Makefile
@@ -242,10 +242,12 @@ tex_out/bitmanip.tex: sv/bitmanip.mdwn
                --filter pandoc_img.py \
                        -N -o tex_out/bitmanip.tex tex_out/bitmanip.mdwn
 
-pdf: simple_v_spec.tex tex
+simple_v_spec.pdf : tex simple_v_spec.tex
        pdflatex -synctex=1 -interaction=nonstopmode simple_v_spec.tex
 
-upload: tex pdf
+pdf : simple_v_spec.pdf
+
+upload : pdf
        rsync -HPavz simple_v_spec.pdf \
         libre-soc.org:/var/www/ftp.libre-riscv.org