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build: disable TCP_NODELAY for emscripten

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In WebAssembly, using `TCP_NODELAY` fails with:
```
* Could not set TCP_NODELAY: Protocol not available
```

Add a new feature macro in `curl_setup.h` telling whether `TCP_NODELAY`
is known to be supported at runtime, when defined at compile-time.

Keep `TCP_NODELAY` guards at their current positions to ensure the
necessary headers (e.g. `netinet/tcp.h` and `netinet/in.h`) define it.

Reported-by: Jeroen Ooms
Fixes #17974
Closes #18155
This commit is contained in:
Viktor Szakats 2025-08-03 23:48:53 +02:00
parent 74ba04f5b2
commit 06c12cc08b
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GPG key ID: B5ABD165E2AEF201
4 changed files with 11 additions and 6 deletions
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2
lib/cf-socket.c
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@ -109,7 +109,7 @@ static void set_ipv6_v6only(curl_socket_t sockfd, int on)
static void tcpnodelay(struct Curl_easy *data, curl_socket_t sockfd)
{
#ifdef TCP_NODELAY
#if defined(TCP_NODELAY) && defined(CURL_TCP_NODELAY_SUPPORTED)
curl_socklen_t onoff = (curl_socklen_t) 1;
int level = IPPROTO_TCP;
char buffer[STRERROR_LEN];