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| author | Alexandre Duret-Lutz <adl@gnu.org> | 2003-11-18 20:06:44 +0000 |
|---|---|---|
| committer | Alexandre Duret-Lutz <adl@gnu.org> | 2003-11-18 20:06:44 +0000 |
| commit | 28c655bd03f2098c66fd6bafd4d0d1cb8c171f3e (patch) | |
| tree | cbb9a60a1b855bd66320a5d72ce5abaa370404e5 /lib/ylwrap | |
| parent | 9b5e57d52c8465ea7df1af852cedeaeb0f43f748 (diff) | |
| download | automake-28c655bd03f2098c66fd6bafd4d0d1cb8c171f3e.tar.gz | |
* lib/ylwrap: Do not overwrite headers if they haven't changed.
Fix the include guard substitution.
* tests/yacc6.test: Augment to run ylwrap, and make sure it
does not needlessly update headers.
* tests/yacc8.test: Make sure headers are not needlessly updated
with ylwrap is not used. Move `test -f foo.o' into the
Makefile as `test -f foo.$(OBJEXT)' for portability.
Diffstat (limited to 'lib/ylwrap')
| -rwxr-xr-x | lib/ylwrap | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/lib/ylwrap b/lib/ylwrap index f5d0c30f6..f86e21730 100755 --- a/lib/ylwrap +++ b/lib/ylwrap @@ -1,7 +1,7 @@ #! /bin/sh # ylwrap - wrapper for lex/yacc invocations. -scriptversion=2003-11-09.00 +scriptversion=2003-11-18.20 # Copyright (C) 1996, 1997, 1998, 1999, 2001, 2002, 2003 # Free Software Foundation, Inc. @@ -149,6 +149,16 @@ if test $status -eq 0; then *) target="../$2";; esac + # We do not want to overwrite a header file if it hasn't + # changed. This avoid useless recompilations. However the + # parser itself (the first file) should always be updated, + # because it is the destination of the .y.c rule in the + # Makefile. Divert the output of all other files to a temporary + # file so we can compare them to existing versions. + if test $first = no; then + realtarget="$target" + target="tmp-`echo $target | sed s/.*[\\/]//g`" + fi # Edit out `#line' or `#' directives. # # We don't want the resulting debug information to point at @@ -165,8 +175,20 @@ if test $status -eq 0; then TARGET=`echo "$2" | sed \ -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'\ -e 's/[^ABCDEFGHIJKLMNOPQRSTUVWXYZ]/_/g'` - sed "/^#/{s,$input_rx,,;s,$from,$2,;s,$FROM,$TO,;}" "$from" >"$target" || - status=$? + + sed -e "/^#/!b" -e "s,$input_rx,," -e "s,$from,$2," \ + -e "s,$FROM,$TARGET," "$from" >"$target" || status=$? + + # Check whether header files must be updated. + if test $first = no; then + if test -f "$realtarget" && cmp -s "$realtarget" "$target"; then + echo "$2" is unchanged + rm -f "$target" + else + echo updating "$2" + mv -f "$target" "$realtarget" + fi + fi else # A missing file is only an error for the first file. This # is a blatant hack to let us support using "yacc -d". If -d |