Allow disabling of internal (libdownload) code

Add a new --disable-internal-download flag to configure allowing the
internal download code to be skipped. This will be helpful on platforms that
currently don't support either libdownload or libfetch (such as Cygwin) and
for just compiling a lighter weight pacman binary.

This was made really easy by our recent refactoring of the download code
into separate internal and external functions, as well as some error code
cleanup.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 20 insertions, 3 deletions

diff --git a/configure.ac b/configure.ac
index f77614bb..3820d894 100644
--- a/configure.ac
+++ b/configure.ac
@@ -98,6 +98,11 @@ AC_ARG_WITH(db-ext,
 	AC_HELP_STRING([--with-db-ext=ext], [set the file extension used by the database]),
 	[DBEXT=$withval], [DBEXT=.db.tar.gz])
 
+# Help line for libdownload/libfetch
+AC_ARG_ENABLE(internal-download,
+	AC_HELP_STRING([--disable-internal-download], [do not build with libdownload/libfetch support]),
+	[internaldownload=$enableval], [internaldownload=yes])
+
 # Help line for documentation
 AC_ARG_ENABLE(doc,
 	AC_HELP_STRING([--disable-doc], [prevent make from looking at doc/ dir]),
@@ -137,10 +142,21 @@ AM_GNU_GETTEXT([external])
 AM_GNU_GETTEXT_VERSION(0.13.1)
 
 # Check for libarchive
-AC_CHECK_LIB([archive], [archive_read_data], , AC_MSG_ERROR([libarchive is needed to compile pacman!]))
+AC_CHECK_LIB([archive], [archive_read_data], ,
+	AC_MSG_ERROR([libarchive is needed to compile pacman!]))
 
-# Check for libdownload
-AC_CHECK_LIB([download], [downloadParseURL], , AC_MSG_ERROR([libdownload is needed to compile pacman!]))
+# Enable or disable usage of libdownload/libfetch
+AC_MSG_CHECKING(whether to link with download library)
+if test "x$internaldownload" = "xyes" ; then
+	AC_MSG_RESULT(yes)
+	AC_DEFINE([INTERNAL_DOWNLOAD], , [Use internal download library])
+	# Check for libdownload if it was actually requested
+	AC_CHECK_LIB([download], [downloadParseURL], ,
+		AC_MSG_ERROR([libdownload is needed to compile pacman!]))
+else
+	AC_MSG_RESULT(no)
+fi
+AM_CONDITIONAL(INTERNAL_DOWNLOAD, test "x$internaldownload" = "xyes")
 
 # Checks for header files.
 AC_CHECK_HEADERS([fcntl.h libintl.h limits.h locale.h string.h strings.h sys/ioctl.h sys/statvfs.h sys/time.h syslog.h wchar.h])
@@ -352,6 +368,7 @@ pacman_display_version:
 
   Compilation options:
     Run make in doc/ dir   : ${wantdoc}
+    Use download library   : ${internaldownload}
     Doxygen support        : ${usedoxygen}
     Asciidoc support       : ${useasciidoc}
     debug support          : ${debug}