[PATCH 1/2] Makefile: avoid running curl-config multiple times

If the user hasn't set the CURL_LDFLAGS Makefile variable, we invoke curl-config like this:

  CURL_LIBCURL += $(shell $(CURL_CONFIG) --libs)

Because the shell function is run when the value is expanded, we invoke curl-config each time we need to link something (which generally ends up being four times for a full build).

Instead, let's use an immediate Makefile variable, which only needs expanding once. We can't combine that with the existing "+=", but since we only do this when CURL_LDFLAGS is undefined, we can just set that variable.

That also allows us to simplify our conditional a bit, since both sides will then put the result into CURL_LIBCURL. While we're touching it, let's fix the indentation to match the nearby code (we're inside an outer conditional, so everything else is indented one level).

Signed-off-by: Jeff King <peff@peff.net>
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 Makefile | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)