build: delete unused feature guards

- `HAVE_STRNCASECMP`
- `HAVE_TCGETATTR`
- `HAVE_TCSETATTR`

Reviewed-by: Jay Satiro
Reviewed-by: Daniel Stenberg
Closes #6645

11 files changed, 7 insertions, 133 deletions

diff --git a/CMake/Platforms/WindowsCache.cmake b/CMake/Platforms/WindowsCache.cmake
index 12cec52dc..e18399917 100644
--- a/CMake/Platforms/WindowsCache.cmake
+++ b/CMake/Platforms/WindowsCache.cmake
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -89,8 +89,6 @@ if(NOT UNIX)
     set(HAVE_INET_ADDR 1)
     set(HAVE_INET_NTOA 1)
     set(HAVE_INET_NTOA_R 0)
-    set(HAVE_TCGETATTR 0)
-    set(HAVE_TCSETATTR 0)
     set(HAVE_PERROR 1)
     set(HAVE_CLOSESOCKET 1)
     set(HAVE_SETVBUF 0)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b92c2b61..62b2235cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1005,8 +1005,6 @@ check_symbol_exists(gettimeofday  "${CURL_INCLUDES}" HAVE_GETTIMEOFDAY)
 check_symbol_exists(inet_addr     "${CURL_INCLUDES}" HAVE_INET_ADDR)
 check_symbol_exists(inet_ntoa     "${CURL_INCLUDES}" HAVE_INET_NTOA)
 check_symbol_exists(inet_ntoa_r   "${CURL_INCLUDES}" HAVE_INET_NTOA_R)
-check_symbol_exists(tcsetattr     "${CURL_INCLUDES}" HAVE_TCSETATTR)
-check_symbol_exists(tcgetattr     "${CURL_INCLUDES}" HAVE_TCGETATTR)
 check_symbol_exists(perror        "${CURL_INCLUDES}" HAVE_PERROR)
 check_symbol_exists(closesocket   "${CURL_INCLUDES}" HAVE_CLOSESOCKET)
 check_symbol_exists(setvbuf       "${CURL_INCLUDES}" HAVE_SETVBUF)
diff --git a/configure.ac b/configure.ac
index 653447476..73b7dc1ae 100755
--- a/configure.ac
+++ b/configure.ac
@@ -4493,7 +4493,6 @@ CURL_CHECK_FUNC_STRCMPI
 CURL_CHECK_FUNC_STRDUP
 CURL_CHECK_FUNC_STRERROR_R
 CURL_CHECK_FUNC_STRICMP
-CURL_CHECK_FUNC_STRNCASECMP
 CURL_CHECK_FUNC_STRNCMPI
 CURL_CHECK_FUNC_STRNICMP
 CURL_CHECK_FUNC_STRSTR
diff --git a/lib/config-os400.h b/lib/config-os400.h
index b8676113d..67fbc41d8 100644
--- a/lib/config-os400.h
+++ b/lib/config-os400.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -352,12 +352,6 @@
 /* Define if you have the <sys/ioctl.h> header file. */
 #define HAVE_SYS_IOCTL_H
 
-/* Define if you have the `tcgetattr' function. */
-#undef HAVE_TCGETATTR
-
-/* Define if you have the `tcsetattr' function. */
-#undef HAVE_TCSETATTR
-
 /* Define if you have the <termios.h> header file. */
 #undef HAVE_TERMIOS_H
 
diff --git a/lib/config-plan9.h b/lib/config-plan9.h
index cc8adde72..f33d3f66b 100644
--- a/lib/config-plan9.h
+++ b/lib/config-plan9.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -173,7 +173,6 @@
 #define HAVE_STRCASECMP 1
 #define HAVE_STRDUP 1
 #define HAVE_STRING_H 1
-#define HAVE_STRNCASECMP 1
 #define HAVE_STRSTR 1
 #define HAVE_STRTOK_R 1
 #define HAVE_STRTOLL 1
diff --git a/lib/config-riscos.h b/lib/config-riscos.h
index 9b5f8da92..43b1deb6d 100644
--- a/lib/config-riscos.h
+++ b/lib/config-riscos.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -329,12 +329,6 @@
 /* Define if you have the <sys/types.h> header file. */
 #define HAVE_SYS_TYPES_H
 
-/* Define if you have the `tcgetattr' function. */
-#define HAVE_TCGETATTR
-
-/* Define if you have the `tcsetattr' function. */
-#define HAVE_TCSETATTR
-
 /* Define if you have the <termios.h> header file. */
 #define HAVE_TERMIOS_H
 
diff --git a/lib/config-vxworks.h b/lib/config-vxworks.h
index 73edd530b..8ae8ab10b 100644
--- a/lib/config-vxworks.h
+++ b/lib/config-vxworks.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -568,9 +568,6 @@
 /* Define to 1 if you have the `strlcpy' function. */
 /* #undef HAVE_STRLCPY */
 
-/* Define to 1 if you have the strncasecmp function. */
-#define HAVE_STRNCASECMP 1
-
 /* Define to 1 if you have the strncmpi function. */
 /* #undef HAVE_STRNCMPI */
 
diff --git a/lib/config-win32.h b/lib/config-win32.h
index 3f8b78a2b..a464fbf5a 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -258,9 +258,6 @@
 /* Define if you have the stricmp function. */
 #define HAVE_STRICMP 1
 
-/* Define if you have the strncasecmp function. */
-/* #define HAVE_STRNCASECMP 1 */
-
 /* Define if you have the strnicmp function. */
 #define HAVE_STRNICMP 1
 
@@ -273,12 +270,6 @@
 #define HAVE_STRTOLL 1
 #endif
 
-/* Define if you have the tcgetattr function. */
-/* #define HAVE_TCGETATTR 1 */
-
-/* Define if you have the tcsetattr function. */
-/* #define HAVE_TCSETATTR 1 */
-
 /* Define if you have the utime function. */
 #ifndef __BORLANDC__
 #define HAVE_UTIME 1
diff --git a/lib/config-win32ce.h b/lib/config-win32ce.h
index 906083694..7f59fd562 100644
--- a/lib/config-win32ce.h
+++ b/lib/config-win32ce.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -205,9 +205,6 @@
 /* Define if you have the stricmp function. */
 /* #define HAVE_STRICMP 1 */
 
-/* Define if you have the strncasecmp function. */
-/* #define HAVE_STRNCASECMP 1 */
-
 /* Define if you have the strnicmp function. */
 /* #define HAVE_STRNICMP 1 */
 
@@ -219,12 +216,6 @@
 #define HAVE_STRTOLL 1
 #endif
 
-/* Define if you have the tcgetattr function.  */
-/* #define HAVE_TCGETATTR 1 */
-
-/* Define if you have the tcsetattr function.  */
-/* #define HAVE_TCSETATTR 1 */
-
 /* Define if you have the utime function */
 #define HAVE_UTIME 1
 
diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index 4c61a02c6..744406711 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -659,9 +659,6 @@
 /* Define to 1 if you have the `strlcpy' function. */
 #cmakedefine HAVE_STRLCPY 1
 
-/* Define to 1 if you have the strncasecmp function. */
-#cmakedefine HAVE_STRNCASECMP 1
-
 /* Define to 1 if you have the strncmpi function. */
 #cmakedefine HAVE_STRNCMPI 1
 
diff --git a/m4/curl-functions.m4 b/m4/curl-functions.m4
index 58a3cf443..fc4d6b2d0 100644
--- a/m4/curl-functions.m4
+++ b/m4/curl-functions.m4
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -6687,90 +6687,6 @@ AC_DEFUN([CURL_CHECK_FUNC_STRICMP], [
   fi
 ])
 
-dnl CURL_CHECK_FUNC_STRNCASECMP
-dnl -------------------------------------------------
-dnl Verify if strncasecmp is available, prototyped, and
-dnl can be compiled. If all of these are true, and
-dnl usage has not been previously disallowed with
-dnl shell variable curl_disallow_strncasecmp, then
-dnl HAVE_STRNCASECMP will be defined.
-
-AC_DEFUN([CURL_CHECK_FUNC_STRNCASECMP], [
-  AC_REQUIRE([CURL_INCLUDES_STRING])dnl
-  #
-  tst_links_strncasecmp="unknown"
-  tst_proto_strncasecmp="unknown"
-  tst_compi_strncasecmp="unknown"
-  tst_allow_strncasecmp="unknown"
-  #
-  AC_MSG_CHECKING([if strncasecmp can be linked])
-  AC_LINK_IFELSE([
-    AC_LANG_FUNC_LINK_TRY([strncasecmp])
-  ],[
-    AC_MSG_RESULT([yes])
-    tst_links_strncasecmp="yes"
-  ],[
-    AC_MSG_RESULT([no])
-    tst_links_strncasecmp="no"
-  ])
-  #
-  if test "$tst_links_strncasecmp" = "yes"; then
-    AC_MSG_CHECKING([if strncasecmp is prototyped])
-    AC_EGREP_CPP([strncasecmp],[
-      $curl_includes_string
-    ],[
-      AC_MSG_RESULT([yes])
-      tst_proto_strncasecmp="yes"
-    ],[
-      AC_MSG_RESULT([no])
-      tst_proto_strncasecmp="no"
-    ])
-  fi
-  #
-  if test "$tst_proto_strncasecmp" = "yes"; then
-    AC_MSG_CHECKING([if strncasecmp is compilable])
-    AC_COMPILE_IFELSE([
-      AC_LANG_PROGRAM([[
-        $curl_includes_string
-      ]],[[
-        if(0 != strncasecmp(0, 0, 0))
-          return 1;
-      ]])
-    ],[
-      AC_MSG_RESULT([yes])
-      tst_compi_strncasecmp="yes"
-    ],[
-      AC_MSG_RESULT([no])
-      tst_compi_strncasecmp="no"
-    ])
-  fi
-  #
-  if test "$tst_compi_strncasecmp" = "yes"; then
-    AC_MSG_CHECKING([if strncasecmp usage allowed])
-    if test "x$curl_disallow_strncasecmp" != "xyes"; then
-      AC_MSG_RESULT([yes])
-      tst_allow_strncasecmp="yes"
-    else
-      AC_MSG_RESULT([no])
-      tst_allow_strncasecmp="no"
-    fi
-  fi
-  #
-  AC_MSG_CHECKING([if strncasecmp might be used])
-  if test "$tst_links_strncasecmp" = "yes" &&
-     test "$tst_proto_strncasecmp" = "yes" &&
-     test "$tst_compi_strncasecmp" = "yes" &&
-     test "$tst_allow_strncasecmp" = "yes"; then
-    AC_MSG_RESULT([yes])
-    AC_DEFINE_UNQUOTED(HAVE_STRNCASECMP, 1,
-      [Define to 1 if you have the strncasecmp function.])
-    curl_cv_func_strncasecmp="yes"
-  else
-    AC_MSG_RESULT([no])
-    curl_cv_func_strncasecmp="no"
-  fi
-])
-
 
 dnl CURL_CHECK_FUNC_STRNCMPI
 dnl -------------------------------------------------