Switch _PICO_EXIT to __PICO_EXIT

Use __ namespace for config options.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

CMakeLists.txt

@@ -159,7 +159,7 @@ if(NOT DEFINED __IO_FLOAT_EXACT)
   option(__IO_FLOAT_EXACT "Provide exact binary/decimal conversion for printf/scanf" ON)
 endif()
 
-set(_PICO_EXIT 1)
+set(__PICO_EXIT 1)
 
 if(NOT DEFINED __ASSERT_VERBOSE)
   option(__ASSERT_VERBOSE "Assert provides verbose information" ON)

meson.build

@@ -1384,7 +1384,7 @@ if mb_capable
   conf_data.set('__MB_EXTENDED_CHARSETS_JIS', mb_jis_charsets)
 endif
 
-conf_data.set('_PICO_EXIT', picoexit)
+conf_data.set('__PICO_EXIT', picoexit)
 if not picoexit
   conf_data.set('_ATEXIT_DYNAMIC_ALLOC', newlib_atexit_dynamic_alloc)
   conf_data.set('_GLOBAL_ATEXIT', get_option('newlib-global-atexit'))

picolibc.h.in

@@ -106,7 +106,7 @@
 /* The newlib version in string format. */
 #define _NEWLIB_VERSION "@NEWLIB_VERSION@"
 
-#cmakedefine _PICO_EXIT
+#cmakedefine __PICO_EXIT
 
 /* The Picolibc minor version number. */
 #define _PICOLIBC_MINOR__ @PROJECT_VERSION_MINOR@