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sectransp: add support for HTTP/2 in gcc builds

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Before this patch `--http2` did not work in gcc builds with Secure
Transport, because ALPN relied on a compiler supporting the
`HAVE_BUILTIN_AVAILABLE` aka `__builtin_available()` feature. This
is clang-specific and missing from gcc (as of gcc v14).

Add support for ALPN and HTTP/2 when this compiler feature is missing.

Also drop test exceptions from GHA/macos in CI.

Follow-up to 092f6815c8
Ref: c349bd668c #14097 (issue 15.)
Ref: #4314

Closes #16581
This commit is contained in:
Viktor Szakats 2025-03-06 00:17:08 +01:00
parent 9463769f2e
commit 2d94439eaa
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GPG key ID: B5ABD165E2AEF201
2 changed files with 8 additions and 10 deletions
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12
lib/vtls/sectransp.c
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@ -1091,10 +1091,13 @@ static CURLcode sectransp_connect_step1(struct Curl_cfilter *cf,
if(result != CURLE_OK)
return result;
if(connssl->alpn) {
#if (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) && \
defined(HAVE_BUILTIN_AVAILABLE)
if(connssl->alpn) {
if(__builtin_available(macOS 10.13.4, iOS 11, tvOS 11, *)) {
#else
if(&SSLSetALPNProtocols && &SSLCopyALPNProtocols) {
#endif
struct alpn_proto_buf proto;
size_t i;
CFStringRef cstr;
@ -1117,7 +1120,6 @@ static CURLcode sectransp_connect_step1(struct Curl_cfilter *cf,
infof(data, VTLS_INFOF_ALPN_OFFER_1STR, proto.data);
}
}
#endif
if(ssl_config->key) {
infof(data, "WARNING: SSL: CURLOPT_SSLKEY is ignored by Secure "
@ -2088,10 +2090,13 @@ check_handshake:
break;
}
if(connssl->alpn) {
#if (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) && \
defined(HAVE_BUILTIN_AVAILABLE)
if(connssl->alpn) {
if(__builtin_available(macOS 10.13.4, iOS 11, tvOS 11, *)) {
#else
if(&SSLSetALPNProtocols && &SSLCopyALPNProtocols) {
#endif
CFArrayRef alpnArr = NULL;
CFStringRef chosenProtocol = NULL;
err = SSLCopyALPNProtocols(backend->ssl_ctx, &alpnArr);
@ -2119,7 +2124,6 @@ check_handshake:
CFRelease(alpnArr);
}
}
#endif
return CURLE_OK;
}