Re: [PATCH/RFC] Makefile: do not depend on curl-config

[Junio C Hamano <gitster@pobox.com>]

Erik Faye-Lund <kusmabite@gmail.com> writes:

> MinGW builds of cURL does not ship with curl-config unless built
> with the autoconf based build system, which is not the practice
> recommended by the documentation. MsysGit has had issues with
> binaries of that sort, so it has switched away from autoconf-based
> cURL-builds.
>
> Unfortunately, broke pushing over WebDAV on Windows, because
> http-push.c depends on cURL's multi-threaded API, which we could
> not determine the presence of any more.
>
> Since troublesome curl-versions are ancient, and not even present
> in RedHat 5, let's just assume cURL is capable instead of doing a
> non-robust check.
>
> Instead, add a check for curl_multi_init to our configure-script,
> for those on ancient system. They probably already need to do the
> configure-dance anyway.
>
> Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
> ---
>
> OK, here's a proper patch. I've even tested it! ;)
>
>
>  Makefile     |  8 +++-----
>  configure.ac | 11 +++++++++++
>  2 files changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index e90f57e..f6b5847 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1133,13 +1133,11 @@ else
>  	REMOTE_CURL_NAMES = $(REMOTE_CURL_PRIMARY) $(REMOTE_CURL_ALIASES)
>  	PROGRAM_OBJS += http-fetch.o
>  	PROGRAMS += $(REMOTE_CURL_NAMES)
> -	curl_check := $(shell (echo 070908; curl-config --vernum) 2>/dev/null | sort -r | sed -ne 2p)
> -	ifeq "$(curl_check)" "070908"
> -		ifndef NO_EXPAT
> +	ifndef NO_EXPAT
> +		ifndef NO_CURL_MULTI
>  			PROGRAM_OBJS += http-push.o
>  		endif

Dave's "ask curl-config about proper compilation options if
available" and this change does *not* semantically conflict, as the
former should stress "if available" part (but note that the key word
is "should").

How old/battle tested is this change?  My inclination at this point
is to revert the merge of Dave's series from 2.0 (yes, I know we
have been looking at fixing it and I _think_ the issue of unpleasant
error message you reported can be fixed, but at this rate we would
not know if we eradicated all the issues for platforms and distros
with confidence by the final), kick it back to 'next'/'pu', and
queue this change also in 'next'/'pu' and cook them so that we can
merge them early in the 2.1 cycle.

This new makefile variable needs a comment at the top, no?

 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index f7d33da..3164b62 100644
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,10 @@ all::
 # git-http-push are not built, and you cannot use http:// and https://
 # transports (neither smart nor dumb).
 #
+# Define NO_CURL_MULTI if your libcurl is sufficiently old and lacks
+# curl_multi_init ("git http-push" to run the deprecated dumb push over
+# http/webdab will not be built).
+#
 # Define CURL_CONFIG to the path to a curl-config binary other than the
 # default 'curl-config'.  If CURL_CONFIG is unset or points to a binary that
 # is not found, defaults to the CURLDIR behavior.

-- 
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