Re: [PATCH 1/2] curl: streamline conditional compilation
On Wed, Mar 16 2022, Elia Pinto wrote:
[Meta: Please chehck the -vN and --in-reply-to options to git-format-patch et al, i.e. make a v2 a v2, and have it reply to the v1 patch or cover-letter.]
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> Earlier we introduced git-curl-compat.h that defines bunch of
> GIT_CURL_HAVE_X where X is a feature of cURL library we care about,
> to make it easily manageable to conditionally compile code against
> the version of cURL library we are given.
>
> There however are two oddball macros. Instead of checking
> GIT_CURL_HAVE_CURL_SOCKOPT_OK and using a fallback definition for
> CURL_SOCKOPT_OK macro, we just defined CURL_SOCKOPT_OK to a safe
> value when compiling against an old version that lack the symbol.
The way it was being done before was intentional & discused on list.
See my original https://lore.kernel.org/git/patch-v3-7.7-93a2775d0ee-20210730T092843Z-avarab@gmail.com/ which did it pretty much like that, and Junio's subsequent follow-up. I.e. this breadcrumb trail: https://lore.kernel.org/git/?q=CURL_SOCKOPT_OK
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> -#if LIBCURL_VERSION_NUM < 0x071505
> -#define CURL_SOCKOPT_OK 0
> +#if LIBCURL_VERSION_NUM >= 0x071505
> +#define GIT_CURL_HAVE_CURL_SOCKOPT_OK 1
> #endif
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> /**
> * CURLOPT_TCP_KEEPALIVE was added in 7.25.0, released in March 2012.
> */
> #if LIBCURL_VERSION_NUM >= 0x071900
> -#define GITCURL_HAVE_CURLOPT_TCP_KEEPALIVE 1
> +#define GIT_CURL_HAVE_CURLOPT_TCP_KEEPALIVE 1
> #endif
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> diff --git a/http.c b/http.c
> index 229da4d148..d7ad7db1d6 100644
> --- a/http.c
> +++ b/http.c
> @@ -517,7 +517,7 @@ static int has_proxy_cert_password(void)
> }
> #endif
>
> -#ifdef GITCURL_HAVE_CURLOPT_TCP_KEEPALIVE
> +#ifdef GIT_CURL_HAVE_CURLOPT_TCP_KEEPALIVE
> static void set_curl_keepalive(CURL *c)
> {Show 11 quoted lines
> curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
> @@ -536,7 +536,9 @@ static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
> rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
> if (rc < 0)
> warning_errno("unable to set SO_KEEPALIVE on socket");
> -
> +#ifndef GIT_CURL_HAVE_CURL_SOCKOPT_OK
> +#define CURL_SOCKOPT_OK 0
> +#endif
> return CURL_SOCKOPT_OK;
> }The whole point of git-curl-compat.h and its big-brother git-compat-util.h is that we'd prefer not to have such hacks inline if at all possible.
For most of the GIT_CURL_* stuff we need to since it's conditionally using symbols etc., but in this case we can just define a fallback centrally and not worry about it in the code.
So the pre-image really is much better.
Elia Pinto
