tidy-up: delete unused build configuration macros

Most of them feature guards:

- `CURL_INCLUDES_SYS_UIO` [1]
- `HAVE_ALLOCA_H` [2]
- `HAVE_CRYPTO_CLEANUP_ALL_EX_DATA` (unused since de71e68000c8624ea13f90b136f8734dd0fb1bdc)
- `HAVE_DLFCN_H`
- `HAVE_DLOPEN`
- `HAVE_DOPRNT`
- `HAVE_FCNTL`
- `HAVE_GETHOSTBYNAME` [3]
- `HAVE_GETOPT_H`
- `HAVE_GETPASS`
- `HAVE_GETPROTOBYNAME`
- `HAVE_GETSERVBYNAME`
- `HAVE_IDN_FREE*`
- `HAVE_INET_ADDR`
- `HAVE_IOCTL`
- `HAVE_KRB4`
- `HAVE_KRB_GET_OUR_IP_FOR_REALM`
- `HAVE_KRB_H`
- `HAVE_LDAPSSL_H`
- `HAVE_LDAP_INIT_FD`
- `HAVE_LIBDL`
- `HAVE_LIBNSL`
- `HAVE_LIBRESOLV*`
- `HAVE_LIBUCB`
- `HAVE_LL`
- `HAVE_LOCALTIME_R`
- `HAVE_MALLOC_H`
- `HAVE_MEMCPY`
- `HAVE_MEMORY_H`
- `HAVE_NETINET_IF_ETHER_H`
- `HAVE_NI_WITHSCOPEID`
- `HAVE_OPENSSL_CRYPTO_H`
- `HAVE_OPENSSL_ERR_H`
- `HAVE_OPENSSL_PEM_H`
- `HAVE_OPENSSL_PKCS12_H`
- `HAVE_OPENSSL_RAND_H`
- `HAVE_OPENSSL_RSA_H`
- `HAVE_OPENSSL_SSL_H`
- `HAVE_OPENSSL_X509_H`
- `HAVE_PEM_H`
- `HAVE_POLL`
- `HAVE_RAND_SCREEN`
- `HAVE_RAND_STATUS`
- `HAVE_RECVFROM`
- `HAVE_SETSOCKOPT`
- `HAVE_SETVBUF`
- `HAVE_SIZEOF_LONG_DOUBLE`
- `HAVE_SOCKIO_H`
- `HAVE_SOCK_OPTS`
- `HAVE_STDIO_H`
- `HAVE_STRCASESTR`
- `HAVE_STRFTIME`
- `HAVE_STRLCAT`
- `HAVE_STRNCMPI`
- `HAVE_STRNICMP`
- `HAVE_STRSTR`
- `HAVE_STRUCT_IN6_ADDR`
- `HAVE_TLD_H`
- `HAVE_TLD_STRERROR`
- `HAVE_UNAME`
- `HAVE_USLEEP`
- `HAVE_WINBER_H`
- `HAVE_WRITEV`
- `HAVE_X509_H`
- `LT_OBJDIR`
- `NEED_BASENAME_PROTO`
- `NOT_NEED_LIBNSL`
- `OPENSSL_NO_KRB5`
- `RECVFROM_TYPE*`
- `SIZEOF_LONG_DOUBLE`
- `STRERROR_R_TYPE_ARG3`
- `USE_YASSLEMUL`
- `_USRDLL` (from CMake) [4]

[1] Related parts in `m4/curl-functions.m4` and `configure.ac` might
    also be deleted.

[2] Related comment can possibly be deleted in
    `packages/vms/generate_config_vms_h_curl.com`.

[3] There are more instances of this in autotools, but I did not dare to
    touch those. Looked like it's used to detect socket support.

[4] This is necessary for MFC (Microsoft Foundation Class) DLLs to
    force linking MFC components statically to the DLL. `libcurl.dll`
    does not use MFC, so we can delete this define.
    Ref: https://docs.microsoft.com/cpp/build/regular-dlls-statically-linked-to-mfc

Script that can help finding unused settings like above:
```shell

autoheader configure.ac  # generate lib/curl_config.h.in

{
  grep -o -E    'set\([A-Z][A-Z0-9_]{3,}'          CMake/Platforms/WindowsCache.cmake | sed -E 's|set\(||g'
  grep -o -E -h '#define +[A-Z][A-Z0-9_]{3,}'      lib/config-*.h                     | sed -E 's|#define +||g'
  grep -o -E    '#cmakedefine +[A-Z][A-Z0-9_]{3,}' lib/curl_config.h.cmake            | sed -E 's|#cmakedefine +||g'
  grep -o -E    '#undef +[A-Z][A-Z0-9_]{3,}'       lib/curl_config.h.in               | sed -E 's|#undef +||g'
} | sort -u | grep -v -F 'HEADER_CURL_' | while read -r def; do
  c="$(git grep -w -F "${def}" | grep -v -E -c '(/libcurl\.tmpl|^lib/config-|^lib/curl_config\.h\.cmake|^CMakeLists\.txt|^CMake/Platforms/WindowsCache\.cmake|^packages/vms/config_h\.com|^m4/curl-functions\.m4|^acinclude\.m4|^configure\.ac)')"
  if [ "${c}" = '0' ]; then
    echo "${def}"
  fi
done
```

Reviewed-by: Daniel Stenberg
Closes #9044

1 files changed, 1 insertions, 52 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 758e7fefa..fce08996a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -327,13 +327,7 @@ if(ENABLE_THREADED_RESOLVER)
 endif()
 
 # Check for all needed libraries
-check_library_exists_concat("${CMAKE_DL_LIBS}" dlopen HAVE_LIBDL)
 check_library_exists_concat("socket" connect      HAVE_LIBSOCKET)
-check_library_exists("c" gethostbyname "" NOT_NEED_LIBNSL)
-
-if(NOT NOT_NEED_LIBNSL)
-  check_library_exists_concat("nsl"    gethostbyname  HAVE_LIBNSL)
-endif()
 
 check_function_exists(gethostname HAVE_GETHOSTNAME)
 
@@ -445,16 +439,7 @@ if(CURL_USE_OPENSSL)
   endif()
 
   set(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
-  check_include_file("openssl/crypto.h" HAVE_OPENSSL_CRYPTO_H)
-  check_include_file("openssl/err.h"    HAVE_OPENSSL_ERR_H)
-  check_include_file("openssl/pem.h"    HAVE_OPENSSL_PEM_H)
-  check_include_file("openssl/rsa.h"    HAVE_OPENSSL_RSA_H)
-  check_include_file("openssl/ssl.h"    HAVE_OPENSSL_SSL_H)
-  check_include_file("openssl/x509.h"   HAVE_OPENSSL_X509_H)
-  check_include_file("openssl/rand.h"   HAVE_OPENSSL_RAND_H)
-  check_symbol_exists(RAND_status "${CURL_INCLUDES}" HAVE_RAND_STATUS)
-  check_symbol_exists(RAND_screen "${CURL_INCLUDES}" HAVE_RAND_SCREEN)
-  check_symbol_exists(RAND_egd    "${CURL_INCLUDES}" HAVE_RAND_EGD)
+  check_symbol_exists(RAND_egd "${CURL_INCLUDES}" HAVE_RAND_EGD)
   check_symbol_exists(OPENSSL_IS_BORINGSSL "openssl/base.h" HAVE_BORINGSSL)
 
   add_definitions(-DOPENSSL_SUPPRESS_DEPRECATED)
@@ -591,7 +576,6 @@ if(NOT CURL_DISABLE_LDAP)
   # Now that we know, we're not using windows LDAP...
   if(USE_WIN32_LDAP)
     check_include_file_concat("winldap.h" HAVE_WINLDAP_H)
-    check_include_file_concat("winber.h"  HAVE_WINBER_H)
   else()
     # Check for LDAP
     set(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_LIBRARIES})
@@ -674,7 +658,6 @@ endif()
 
 if(NOT CURL_DISABLE_LDAPS)
   check_include_file_concat("ldap_ssl.h" HAVE_LDAP_SSL_H)
-  check_include_file_concat("ldapssl.h"  HAVE_LDAPSSL_H)
 endif()
 
 # Check for idn2
@@ -693,9 +676,6 @@ if(WIN32)
   endif()
 endif()
 
-# Check for symbol dlopen (same as HAVE_LIBDL)
-check_library_exists("${CURL_LIBS}" dlopen "" HAVE_DLOPEN)
-
 set(HAVE_LIBZ OFF)
 set(HAVE_ZLIB_H OFF)
 set(USE_ZLIB OFF)
@@ -966,7 +946,6 @@ if(NOT UNIX)
   check_include_file_concat("wincrypt.h"     HAVE_WINCRYPT_H)
 endif()
 
-check_include_file_concat("stdio.h"          HAVE_STDIO_H)
 check_include_file_concat("inttypes.h"       HAVE_INTTYPES_H)
 check_include_file_concat("sys/filio.h"      HAVE_SYS_FILIO_H)
 check_include_file_concat("sys/ioctl.h"      HAVE_SYS_IOCTL_H)
@@ -979,11 +958,9 @@ check_include_file_concat("sys/sockio.h"     HAVE_SYS_SOCKIO_H)
 check_include_file_concat("sys/stat.h"       HAVE_SYS_STAT_H)
 check_include_file_concat("sys/time.h"       HAVE_SYS_TIME_H)
 check_include_file_concat("sys/types.h"      HAVE_SYS_TYPES_H)
-check_include_file_concat("sys/uio.h"        HAVE_SYS_UIO_H)
 check_include_file_concat("sys/un.h"         HAVE_SYS_UN_H)
 check_include_file_concat("sys/utime.h"      HAVE_SYS_UTIME_H)
 check_include_file_concat("sys/xattr.h"      HAVE_SYS_XATTR_H)
-check_include_file_concat("alloca.h"         HAVE_ALLOCA_H)
 check_include_file_concat("arpa/inet.h"      HAVE_ARPA_INET_H)
 check_include_file_concat("arpa/tftp.h"      HAVE_ARPA_TFTP_H)
 check_include_file_concat("assert.h"         HAVE_ASSERT_H)
@@ -992,7 +969,6 @@ check_include_file_concat("fcntl.h"          HAVE_FCNTL_H)
 check_include_file_concat("idn2.h"           HAVE_IDN2_H)
 check_include_file_concat("ifaddrs.h"        HAVE_IFADDRS_H)
 check_include_file_concat("io.h"             HAVE_IO_H)
-check_include_file_concat("krb.h"            HAVE_KRB_H)
 check_include_file_concat("libgen.h"         HAVE_LIBGEN_H)
 check_include_file_concat("locale.h"         HAVE_LOCALE_H)
 check_include_file_concat("net/if.h"         HAVE_NET_IF_H)
@@ -1001,7 +977,6 @@ check_include_file_concat("netinet/in.h"     HAVE_NETINET_IN_H)
 check_include_file_concat("netinet/tcp.h"    HAVE_NETINET_TCP_H)
 check_include_file("linux/tcp.h"      HAVE_LINUX_TCP_H)
 
-check_include_file_concat("pem.h"            HAVE_PEM_H)
 check_include_file_concat("poll.h"           HAVE_POLL_H)
 check_include_file_concat("pwd.h"            HAVE_PWD_H)
 check_include_file_concat("setjmp.h"         HAVE_SETJMP_H)
@@ -1009,7 +984,6 @@ check_include_file_concat("signal.h"         HAVE_SIGNAL_H)
 check_include_file_concat("ssl.h"            HAVE_SSL_H)
 check_include_file_concat("stdbool.h"        HAVE_STDBOOL_H)
 check_include_file_concat("stdint.h"         HAVE_STDINT_H)
-check_include_file_concat("stdio.h"          HAVE_STDIO_H)
 check_include_file_concat("stdlib.h"         HAVE_STDLIB_H)
 check_include_file_concat("string.h"         HAVE_STRING_H)
 check_include_file_concat("strings.h"        HAVE_STRINGS_H)
@@ -1019,16 +993,10 @@ check_include_file_concat("termios.h"        HAVE_TERMIOS_H)
 check_include_file_concat("time.h"           HAVE_TIME_H)
 check_include_file_concat("unistd.h"         HAVE_UNISTD_H)
 check_include_file_concat("utime.h"          HAVE_UTIME_H)
-check_include_file_concat("x509.h"           HAVE_X509_H)
 
 check_include_file_concat("process.h"        HAVE_PROCESS_H)
 check_include_file_concat("stddef.h"         HAVE_STDDEF_H)
-check_include_file_concat("dlfcn.h"          HAVE_DLFCN_H)
-check_include_file_concat("malloc.h"         HAVE_MALLOC_H)
-check_include_file_concat("memory.h"         HAVE_MEMORY_H)
-check_include_file_concat("netinet/if_ether.h" HAVE_NETINET_IF_ETHER_H)
 check_include_file_concat("stdint.h"        HAVE_STDINT_H)
-check_include_file_concat("sockio.h"        HAVE_SOCKIO_H)
 check_include_file_concat("sys/utsname.h"   HAVE_SYS_UTSNAME_H)
 
 check_type_size(size_t  SIZEOF_SIZE_T)
@@ -1038,7 +1006,6 @@ check_type_size("long"  SIZEOF_LONG)
 check_type_size("short"  SIZEOF_SHORT)
 check_type_size("int"  SIZEOF_INT)
 check_type_size("__int64"  SIZEOF___INT64)
-check_type_size("long double"  SIZEOF_LONG_DOUBLE)
 check_type_size("time_t"  SIZEOF_TIME_T)
 if(NOT HAVE_SIZEOF_SSIZE_T)
   if(SIZEOF_LONG EQUAL SIZEOF_SIZE_T)
@@ -1052,7 +1019,6 @@ endif()
 
 if(HAVE_SIZEOF_LONG_LONG)
   set(HAVE_LONGLONG 1)
-  set(HAVE_LL 1)
 endif()
 
 if(NOT CMAKE_CROSSCOMPILING)
@@ -1071,37 +1037,25 @@ check_symbol_exists(fchmod        "${CURL_INCLUDES}" HAVE_FCHMOD)
 check_symbol_exists(basename      "${CURL_INCLUDES}" HAVE_BASENAME)
 check_symbol_exists(socket        "${CURL_INCLUDES}" HAVE_SOCKET)
 check_symbol_exists(select        "${CURL_INCLUDES}" HAVE_SELECT)
-check_symbol_exists(poll          "${CURL_INCLUDES}" HAVE_POLL)
 check_symbol_exists(strdup        "${CURL_INCLUDES}" HAVE_STRDUP)
-check_symbol_exists(strstr        "${CURL_INCLUDES}" HAVE_STRSTR)
 check_symbol_exists(strtok_r      "${CURL_INCLUDES}" HAVE_STRTOK_R)
-check_symbol_exists(strftime      "${CURL_INCLUDES}" HAVE_STRFTIME)
-check_symbol_exists(uname         "${CURL_INCLUDES}" HAVE_UNAME)
 check_symbol_exists(strcasecmp    "${CURL_INCLUDES}" HAVE_STRCASECMP)
 check_symbol_exists(stricmp       "${CURL_INCLUDES}" HAVE_STRICMP)
 check_symbol_exists(strcmpi       "${CURL_INCLUDES}" HAVE_STRCMPI)
-check_symbol_exists(strncmpi      "${CURL_INCLUDES}" HAVE_STRNCMPI)
 check_symbol_exists(alarm         "${CURL_INCLUDES}" HAVE_ALARM)
-if(NOT HAVE_STRNCMPI)
-  set(HAVE_STRCMPI)
-endif()
 check_symbol_exists(getppid       "${CURL_INCLUDES}" HAVE_GETPPID)
 check_symbol_exists(utimes        "${CURL_INCLUDES}" HAVE_UTIMES)
 
 check_symbol_exists(gettimeofday  "${CURL_INCLUDES}" HAVE_GETTIMEOFDAY)
-check_symbol_exists(inet_addr     "${CURL_INCLUDES}" HAVE_INET_ADDR)
 check_symbol_exists(closesocket   "${CURL_INCLUDES}" HAVE_CLOSESOCKET)
 check_symbol_exists(sigsetjmp     "${CURL_INCLUDES}" HAVE_SIGSETJMP)
 check_symbol_exists(getpass_r     "${CURL_INCLUDES}" HAVE_GETPASS_R)
 check_symbol_exists(getpwuid      "${CURL_INCLUDES}" HAVE_GETPWUID)
 check_symbol_exists(getpwuid_r    "${CURL_INCLUDES}" HAVE_GETPWUID_R)
 check_symbol_exists(geteuid       "${CURL_INCLUDES}" HAVE_GETEUID)
-check_symbol_exists(usleep        "${CURL_INCLUDES}" HAVE_USLEEP)
 check_symbol_exists(utime         "${CURL_INCLUDES}" HAVE_UTIME)
 check_symbol_exists(gmtime_r      "${CURL_INCLUDES}" HAVE_GMTIME_R)
-check_symbol_exists(localtime_r   "${CURL_INCLUDES}" HAVE_LOCALTIME_R)
 
-check_symbol_exists(gethostbyname   "${CURL_INCLUDES}" HAVE_GETHOSTBYNAME)
 check_symbol_exists(gethostbyname_r "${CURL_INCLUDES}" HAVE_GETHOSTBYNAME_R)
 
 check_symbol_exists(signal        "${CURL_INCLUDES}" HAVE_SIGNAL_FUNC)
@@ -1109,7 +1063,6 @@ check_symbol_exists(SIGALRM       "${CURL_INCLUDES}" HAVE_SIGNAL_MACRO)
 if(HAVE_SIGNAL_FUNC AND HAVE_SIGNAL_MACRO)
   set(HAVE_SIGNAL 1)
 endif()
-check_symbol_exists(uname          "${CURL_INCLUDES}" HAVE_UNAME)
 check_symbol_exists(strtoll        "${CURL_INCLUDES}" HAVE_STRTOLL)
 check_symbol_exists(_strtoi64      "${CURL_INCLUDES}" HAVE__STRTOI64)
 check_symbol_exists(strerror_r     "${CURL_INCLUDES}" HAVE_STRERROR_R)
@@ -1118,7 +1071,6 @@ check_symbol_exists(getaddrinfo    "${CURL_INCLUDES}" HAVE_GETADDRINFO)
 check_symbol_exists(freeaddrinfo   "${CURL_INCLUDES}" HAVE_FREEADDRINFO)
 check_symbol_exists(pipe           "${CURL_INCLUDES}" HAVE_PIPE)
 check_symbol_exists(ftruncate      "${CURL_INCLUDES}" HAVE_FTRUNCATE)
-check_symbol_exists(getprotobyname "${CURL_INCLUDES}" HAVE_GETPROTOBYNAME)
 check_symbol_exists(getpeername    "${CURL_INCLUDES}" HAVE_GETPEERNAME)
 check_symbol_exists(getsockname    "${CURL_INCLUDES}" HAVE_GETSOCKNAME)
 check_symbol_exists(if_nametoindex "${CURL_INCLUDES}" HAVE_IF_NAMETOINDEX)
@@ -1126,9 +1078,6 @@ check_symbol_exists(getrlimit      "${CURL_INCLUDES}" HAVE_GETRLIMIT)
 check_symbol_exists(setlocale      "${CURL_INCLUDES}" HAVE_SETLOCALE)
 check_symbol_exists(setmode        "${CURL_INCLUDES}" HAVE_SETMODE)
 check_symbol_exists(setrlimit      "${CURL_INCLUDES}" HAVE_SETRLIMIT)
-check_symbol_exists(fcntl          "${CURL_INCLUDES}" HAVE_FCNTL)
-check_symbol_exists(ioctl          "${CURL_INCLUDES}" HAVE_IOCTL)
-check_symbol_exists(setsockopt     "${CURL_INCLUDES}" HAVE_SETSOCKOPT)
 check_function_exists(mach_absolute_time HAVE_MACH_ABSOLUTE_TIME)
 check_symbol_exists(inet_pton      "${CURL_INCLUDES}" HAVE_INET_PTON)