[PATCH V3] configure.ac: Fallback to older detection code if pkg-config can't find expat
peter.hutterer at who-t.net
Tue Feb 3 13:50:10 PST 2015
On Tue, Feb 03, 2015 at 12:33:35PM -0800, Bill Spitzak wrote:
> This paritally reverts commit a4afd90f9f0c27ed5f3f313b915c260673f8be34.
> On older expat versions (ie the one on Ubuntu 12.04) there is no pkg-config
> file, so fall back to a test for the header and library.
hmm, this is the first time I read this paragraph: 12.04 is almost 2 years
old now, are there any more recent examples that need this patch? If not,
I'd recommend going with "install newer expat in your prefix" than
adding build system workarounds.
> The restored test has been updated to use AC_SEARCH_LIBS.
> configure.ac | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
> diff --git a/configure.ac b/configure.ac
> index 0426b53..402de84 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -85,7 +85,14 @@ AC_ARG_WITH(icondir, [ --with-icondir=<dir> Look for cursor icons here],
> if test "x$enable_scanner" = "xyes"; then
> - PKG_CHECK_MODULES(EXPAT, [expat])
> + PKG_CHECK_MODULES(EXPAT, [expat],,
> + [AC_CHECK_HEADERS(expat.h,,
> + [AC_MSG_ERROR([Can't find expat.h. Please install expat.])])
> + SAVE_LIBS="$LIBS"
> + AC_SEARCH_LIBS(XML_ParserCreate, expat, [EXPAT_LIBS="$LIBS"],
> + [AC_MSG_ERROR([Can't find expat library. Please install expat.])])
> + LIBS="$SAVE_LIBS"
> + ])
> AC_PATH_PROG(XSLTPROC, xsltproc)
that looks correct, but the ,, almost caught me and the nesting is a bit
hard to read. How about:
PKG_CHECK_MODULES(EXPAT, [expat], HAVE_EXPAT="yes", HAVE_EXPAT="no")
if test x$HAVE_EXPAT = "xno"; then
AC_SUBST # I think you should have it explicitly here
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