change the iconv configuration option names to be more verbose.

CMakeLists.txt

@@ -448,7 +448,7 @@ set_option(SDL_DIRECTFB            "Use DirectFB video driver" OFF)
 dep_option(SDL_DIRECTFB_SHARED     "Dynamically load directfb support" ON "SDL_DIRECTFB" OFF)
 set_option(SDL_DUMMYVIDEO          "Use dummy video driver" ON)
 dep_option(SDL_IBUS                "Enable IBus support" ON ${UNIX_SYS} OFF)
-set_option(SDL_ICONV               "Use iconv() from system-installed libraries" ON)
+set_option(SDL_SYSTEM_ICONV        "Use iconv() from system-installed libraries" ON)
 set_option(SDL_OPENGL              "Include OpenGL support" ON)
 set_option(SDL_OPENGLES            "Include OpenGL ES support" ON)
 set_option(SDL_PTHREADS            "Use POSIX threads for multi-threading" ${SDL_PTHREADS_ENABLED_BY_DEFAULT})
@@ -1024,15 +1024,17 @@ if(SDL_LIBC)
       endif()
     endif()
 
-    if(SDL_ICONV)
+    if(SDL_SYSTEM_ICONV)
       check_library_exists(iconv iconv_open "" HAVE_LIBICONV)
       if(HAVE_LIBICONV)
         list(APPEND EXTRA_LIBS iconv)
         set(HAVE_ICONV 1)
+        set(HAVE_SYSTEM_ICONV TRUE)
       else()
         check_library_exists(c iconv_open "" HAVE_BUILTIN_ICONV)
         if(HAVE_BUILTIN_ICONV)
           set(HAVE_ICONV 1)
+          set(HAVE_SYSTEM_ICONV TRUE)
         endif()
       endif()
     endif()

configure

@@ -840,7 +840,7 @@ enable_largefile
 enable_assertions
 enable_dependency_tracking
 enable_libc
-enable_iconv
+enable_system_iconv
 enable_gcc_atomics
 enable_atomic
 enable_audio
@@ -1632,7 +1632,7 @@ Optional Features:
   --enable-dependency-tracking
                           Use gcc -MMD -MT dependency tracking [default=yes]
   --enable-libc           Use the system C library [default=yes]
-  --enable-iconv          Use iconv() from system-installed libraries
+  --enable-system-iconv   Use iconv() from system-installed libraries
                           [default=yes]
   --enable-gcc-atomics    Use gcc builtin atomics [default=yes]
   --enable-atomic         Enable the atomic operations subsystem [default=yes]
@@ -18680,12 +18680,12 @@ else $as_nop
 fi
 
 
-# Check whether --enable-iconv was given.
+# Check whether --enable-system-iconv was given.
-if test ${enable_iconv+y}
+if test ${enable_system_iconv+y}
 then :
-  enableval=$enable_iconv;
+  enableval=$enable_system_iconv;
 else $as_nop
-  enable_iconv=yes
+  enable_system_iconv=yes
 fi
 
 
@@ -19896,7 +19896,7 @@ then :
 fi
 
 
-    if test x$enable_iconv = xyes; then
+    if test x$enable_system_iconv = xyes; then
         { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for iconv_open in -liconv" >&5
 printf %s "checking for iconv_open in -liconv... " >&6; }
 if test ${ac_cv_lib_iconv_iconv_open+y}
@@ -28983,7 +28983,7 @@ printf "%s\n" "#define SDL_VIDEO_RENDER_OGL_ES2 1" >>confdefs.h
         SUMMARY_video="${SUMMARY_video} uikit"
         have_video=yes
         EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"
-        if test x$enable_iconv = xyes; then
+        if test x$enable_system_iconv = xyes; then
             EXTRA_LDFLAGS="$EXTRA_LDFLAGS -liconv"
         fi
         EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lobjc"
@@ -29282,7 +29282,7 @@ printf "%s\n" "#define SDL_TIMER_UNIX 1" >>confdefs.h
 
         # Set up the core platform files
         SOURCES="$SOURCES $srcdir/src/core/os2/*.c"
-        if test x$enable_iconv = xyes; then
+        if test x$enable_system_iconv = xyes; then
             if test x$ac_cv_func_iconv != xyes -o x$ac_cv_header_iconv_h != xyes; then
                 SOURCES="$SOURCES $srcdir/src/core/os2/geniconv/*.c"
             fi

configure.ac

@@ -319,9 +319,9 @@ AC_ARG_ENABLE(libc,
               , enable_libc=yes)
 
 dnl See whether we are allowed to use libiconv
-AC_ARG_ENABLE(iconv,
+AC_ARG_ENABLE(system-iconv,
-[AS_HELP_STRING([--enable-iconv], [Use iconv() from system-installed libraries [default=yes]])],
+[AS_HELP_STRING([--enable-system-iconv], [Use iconv() from system-installed libraries [default=yes]])],
-              , enable_iconv=yes)
+              , enable_system_iconv=yes)
 
 if test x$enable_libc = xyes; then
     AC_DEFINE(HAVE_LIBC, 1, [ ])
@@ -353,7 +353,7 @@ dnl Checks for library functions.
     AC_CHECK_LIB(m, pow, [LIBS="$LIBS -lm"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"])
     AC_CHECK_FUNCS(acos acosf asin asinf atan atanf atan2 atan2f ceil ceilf copysign copysignf cos cosf exp expf fabs fabsf floor floorf trunc truncf fmod fmodf log logf log10 log10f lround lroundf pow powf round roundf scalbn scalbnf sin sinf sqrt sqrtf tan tanf)
 
-    if test x$enable_iconv = xyes; then
+    if test x$enable_system_iconv = xyes; then
         AC_CHECK_LIB(iconv, iconv_open, [LIBS="$LIBS -liconv"; EXTRA_LDFLAGS="$EXTRA_LDFLAGS -liconv"])
         AC_CHECK_FUNCS(iconv)
     fi
@@ -4306,7 +4306,7 @@ dnl BeOS support removed after SDL 2.0.1. Haiku still works.  --ryan.
         SUMMARY_video="${SUMMARY_video} uikit"
         have_video=yes
         EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lm"
-        if test x$enable_iconv = xyes; then
+        if test x$enable_system_iconv = xyes; then
             EXTRA_LDFLAGS="$EXTRA_LDFLAGS -liconv"
         fi
         EXTRA_LDFLAGS="$EXTRA_LDFLAGS -lobjc"
@@ -4571,7 +4571,7 @@ dnl BeOS support removed after SDL 2.0.1. Haiku still works.  --ryan.
 
         # Set up the core platform files
         SOURCES="$SOURCES $srcdir/src/core/os2/*.c"
-        if test x$enable_iconv = xyes; then
+        if test x$enable_system_iconv = xyes; then
             if test x$ac_cv_func_iconv != xyes -o x$ac_cv_header_iconv_h != xyes; then
                 SOURCES="$SOURCES $srcdir/src/core/os2/geniconv/*.c"
             fi