lib: skip compiling code with features disabled

In non-SSL, non-SSH, non-H3, non-AppleSecTrust builds.

Also:
- drop unused internal macro `SSL_SYSTEM_VERIFIER`.

Closes curl#20587

Author: vszakats

lib/vquic/vquic.c

@@ -22,32 +22,35 @@
  *
  ***************************************************************************/
 #include "../curl_setup.h"
+#include "../urldata.h"
+#include "vquic.h"
+
+#include "../curl_trc.h"
+
+#if !defined(CURL_DISABLE_HTTP) && defined(USE_HTTP3)
 
 #ifdef HAVE_NETINET_UDP_H
 #include <netinet/udp.h>
 #endif
+
 #ifdef USE_NGHTTP3
 #include <nghttp3/nghttp3.h>
 #endif
-#include "../urldata.h"
+
 #include "../bufq.h"
 #include "../curlx/dynbuf.h"
 #include "../curlx/fopen.h"
 #include "../cfilters.h"
-#include "../curl_trc.h"
 #include "curl_ngtcp2.h"
 #include "curl_quiche.h"
 #include "../multiif.h"
 #include "../progress.h"
 #include "../rand.h"
-#include "vquic.h"
 #include "vquic_int.h"
 #include "../curlx/strerr.h"
 #include "../curlx/strparse.h"
 
 
-#if !defined(CURL_DISABLE_HTTP) && defined(USE_HTTP3)
-
 #define NW_CHUNK_SIZE     (64 * 1024)
 #define NW_SEND_CHUNKS    1
 

lib/vquic/vquic_int.h

@@ -25,10 +25,10 @@
  ***************************************************************************/
 #include "../curl_setup.h"
 
-#include "../bufq.h"
-
 #ifdef USE_HTTP3
 
+#include "../bufq.h"
+
 #define MAX_PKT_BURST         10
 #define MAX_UDP_PAYLOAD_SIZE  1452
 
@@ -121,8 +121,6 @@ CURLcode vquic_recv_packets(struct Curl_cfilter *cf,
                             size_t max_pkts,
                             vquic_recv_pkts_cb *recv_cb, void *userp);
 
-#endif /* !USE_HTTP3 */
-
 #ifdef USE_NGTCP2
 struct ngtcp2_mem;
 struct ngtcp2_mem *Curl_ngtcp2_mem(void);
@@ -132,4 +130,6 @@ struct nghttp3_mem;
 struct nghttp3_mem *Curl_nghttp3_mem(void);
 #endif
 
+#endif /* !USE_HTTP3 */
+
 #endif /* HEADER_CURL_VQUIC_QUIC_INT_H */

lib/vssh/ssh.h

@@ -24,13 +24,16 @@
  *
  ***************************************************************************/
 #include "../curl_setup.h"
+#include "../urldata.h"
 
 extern const struct Curl_protocol Curl_protocol_sftp;
 extern const struct Curl_protocol Curl_protocol_scp;
 
 extern const struct Curl_scheme Curl_scheme_sftp;
 extern const struct Curl_scheme Curl_scheme_scp;
 
+#ifdef USE_SSH
+
 #ifdef USE_LIBSSH2
 #include <libssh2.h>
 #include <libssh2_sftp.h>
@@ -236,8 +239,6 @@ struct ssh_conn {
 
 #endif /* USE_LIBSSH2 */
 
-#ifdef USE_SSH
-
 #ifdef CURLVERBOSE
 const char *Curl_ssh_statename(sshstate state);
 #else
@@ -255,11 +256,10 @@ void Curl_ssh_cleanup(void);
 void Curl_ssh_version(char *buffer, size_t buflen);
 void Curl_ssh_attach(struct Curl_easy *data,
                      struct connectdata *conn);
-#else
-/* for non-SSH builds */
+#else /* !USE_SSH */
 #define Curl_ssh_cleanup()
 #define Curl_ssh_attach(x, y)
 #define Curl_ssh_init() 0
-#endif
+#endif /* USE_SSH */
 
 #endif /* HEADER_CURL_SSH_H */

lib/vssh/vssh.c

@@ -22,10 +22,11 @@
  *
  ***************************************************************************/
 #include "../curl_setup.h"
-
-#include "vssh.h"
 #include "ssh.h"
+
 #ifdef USE_SSH
+
+#include "vssh.h"
 #include "../curlx/strparse.h"
 #include "../curl_trc.h"
 #include "../escape.h"

lib/vssh/vssh.h

@@ -25,6 +25,8 @@
  ***************************************************************************/
 #include "../curl_setup.h"
 
+#ifdef USE_SSH
+
 #include "../urldata.h"
 
 CURLcode Curl_getworkingpath(struct Curl_easy *data,
@@ -36,5 +38,5 @@ CURLcode Curl_get_pathname(const char **cpp, char **path, const char *homedir);
 CURLcode Curl_ssh_range(struct Curl_easy *data,
                         const char *range, curl_off_t filesize,
                         curl_off_t *startp, curl_off_t *sizep);
-
+#endif /* USE_SSH */
 #endif /* HEADER_CURL_VSSH_VSSH_H */

lib/vtls/apple.c

@@ -40,19 +40,15 @@
 
 #include "../curl_setup.h"
 
+#ifdef USE_APPLE_SECTRUST
+
 #include "../urldata.h"
 #include "../cfilters.h"
 #include "../curl_trc.h"
 #include "vtls.h"
 #include "apple.h"
 
-#ifdef USE_APPLE_SECTRUST
 #include <Security/Security.h>
-#endif
-
-
-#ifdef USE_APPLE_SECTRUST
-#define SSL_SYSTEM_VERIFIER
 
 #if (defined(MAC_OS_X_VERSION_MAX_ALLOWED) &&   \
      MAC_OS_X_VERSION_MAX_ALLOWED >= 101400) || \

lib/vtls/schannel_verify.c

@@ -30,6 +30,7 @@
 #include "../curl_setup.h"
 
 #ifdef USE_SCHANNEL
+
 #ifndef USE_WINDOWS_SSPI
 #error "cannot compile Schannel support without SSPI."
 #endif

lib/vtls/vtls.c

@@ -147,7 +147,7 @@ static const struct alpn_spec ALPN_SPEC_H2_H11 = {
 static const struct alpn_spec ALPN_SPEC_H11_H2 = {
   { ALPN_HTTP_1_1, ALPN_H2 }, 2
 };
-#endif
+#endif /* USE_HTTP2 */
 
 #if !defined(CURL_DISABLE_HTTP) || !defined(CURL_DISABLE_PROXY)
 static const struct alpn_spec *alpn_get_spec(http_majors wanted,

lib/vtls/vtls_int.h

@@ -25,13 +25,13 @@
  ***************************************************************************/
 #include "../curl_setup.h"
 
+#ifdef USE_SSL
+
 #include "../cfilters.h"
 #include "../select.h"
 #include "../urldata.h"
 #include "vtls.h"
 
-#ifdef USE_SSL
-
 struct Curl_ssl;
 struct ssl_connect_data;
 struct Curl_ssl_session;

lib/vtls/vtls_scache.h

@@ -25,11 +25,11 @@
  ***************************************************************************/
 #include "../curl_setup.h"
 
+#ifdef USE_SSL
+
 #include "../cfilters.h"
 #include "../urldata.h"
 
-#ifdef USE_SSL
-
 struct Curl_cfilter;
 struct Curl_easy;
 struct Curl_ssl_scache;