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Implement configure cache versioning for backend enabling results

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such that removing config.cache is not needed as frequently as it
is currently.  We just detect and stale the cache results for our
own backends.  If the user installs missing libraries, they still
need to remove the cache manually.

Note that everytime a change is made to configure.in and may change
the results of at least one CAIRO_BACKEND_ENABLE call, the
cairo_cache_version number should be increased.
This commit is contained in:
Behdad Esfahbod 2006-08-10 12:44:35 -04:00
parent c3c706873e
commit 24374ad613
1 changed files with 13 additions and 3 deletions
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16
configure.in
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@ -84,6 +84,14 @@ dnl ===========================================================================
PKG_PROG_PKG_CONFIG
dnl ===========================================================================
dnl
dnl cairo_cache_version should be increased every time that the backend
dnl detection stuff changes in a way that removing the config.cache file may be
dnl needed for correct operation.
dnl
m4_define(cairo_cache_version, 1)
dnl ===========================================================================
dnl
dnl Define a macro to enable backends.
@ -99,8 +107,6 @@ dnl DEFAULT is the default state of the backend:
dnl "no" for experimental backends, eg. your favorite new backend
dnl "yes" for mandatory backends, eg. png
dnl "auto" for other supported backends, eg. xlib
dnl REQUIRES is the list of pkg-config modules that should be Require'd in the
dnl backend-specific .pc file.
dnl COMMANDS are run to check whether the backend can be enabled. Their
dnl result may be cached, so user should not count on them being run.
dnl They should set use_$(NAMESPACE) to something other than yes if the
@ -117,6 +123,10 @@ AC_DEFUN([CAIRO_BACKEND_ENABLE],
if test "x$enable_$1" = xno; then
use_$1="no (disabled, use --enable-$3 to enable)"
else
if test "x$cairo_cv_backend_[]$1[]_cache_version" != "x[]cairo_cache_version"; then
# cached results for this backend (if any) are stale. force rechecking.
unset cairo_cv_backend_[]$1[]_use
fi
AC_CACHE_CHECK([for cairo's $2 backend], cairo_cv_backend_[]$1[]_use,
[echo
use_[]$1=yes
@ -128,6 +138,7 @@ AC_DEFUN([CAIRO_BACKEND_ENABLE],
$1[]_BASE=cairo
$6
cairo_cv_backend_[]$1[]_use=$use_[]$1
cairo_cv_backend_[]$1[]_cache_version=cairo_cache_version
cairo_cv_backend_[]$1[]_requires=$[]$1[]_REQUIRES
cairo_cv_backend_[]$1[]_cflags=$[]$1[]_CFLAGS
cairo_cv_backend_[]$1[]_libs=$[]$1[]_LIBS
@ -136,7 +147,6 @@ AC_DEFUN([CAIRO_BACKEND_ENABLE],
cairo_cv_backend_[]$1[]_base=$[]$1[]_BASE
AC_MSG_CHECKING([whether cairo's $2 backend could be enabled])])
# split the backend spec into its components
use_[]$1=$cairo_cv_backend_[]$1[]_use
$1[]_BASE=$cairo_cv_backend_[]$1[]_base