[Buildroot] Implicit declaration of mblen

[Peter Seiderer]

Hello Kees,

On Mon, 23 Oct 2017 09:11:35 -0700 (MST), Kees van Unen <Keesvanunen at hotmail.com> wrote:

> > Copy the the make command line from the xlib_libX11, append V=1 to it, and 
> > you'll see the compilation commands. Copy the compilation command for the 
> > failing file, replace the -c with -E and the -o with some filename, so you
> > get 
> > the preprocessed file. Then in that preprocessed file check which stdlib.h
> > it 
> > includes. stdlib.h should be included from include/X11/Xlibint.h.   
> 
> Hi, I managed to get the preprocessor file (see uploaded file). It includes
> the next stdlib.h:
> 
> output/host/arm-buildroot-linux-uclibc/gnueabihf/sysroot/usr/include/stdlib.h
> 
> In this version of stdlib.h there is no reference to mblen (see uploaded
> file).
> 
> Regards,
> Kees
> 
> imCallbk.o
> <http://buildroot-busybox.2317881.n4.nabble.com/file/t2263/imCallbk.o>  
> stdlib.h
> <http://buildroot-busybox.2317881.n4.nabble.com/file/t2263/stdlib.h>  
> 

Compared against local build (git master):

seiderer at localhost:~/Work/Buildroot/build-rpi0-xlib_libX11-1.6.5-mblen-error-001> wget http://buildroot-busybox.2317881.n4.nabble.com/file/t2263/stdlib.h
seiderer at localhost:~/Work/Buildroot/build-rpi0-xlib_libX11-1.6.5-mblen-error-001> diff -u stdlib.h ./host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/stdlib.h
--- stdlib.h	2017-10-23 20:17:01.351394515 +0200
+++ ./host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include/stdlib.h	2017-10-21 23:29:09.028752219 +0200
@@ -26,6 +26,7 @@
 /* Get size_t, wchar_t and NULL from <stddef.h>.  */
 #define		__need_size_t
 #ifndef __need_malloc_and_calloc
+#  define	__need_wchar_t
 # define	__need_NULL
 #endif
 #include <stddef.h>
@@ -138,7 +139,8 @@
 #define	MB_CUR_MAX	(__ctype_get_mb_cur_max ())
 extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
 #else
-# define	MB_CUR_MAX	1
+# define	MB_CUR_MAX	(_stdlib_mb_cur_max ())
+extern size_t _stdlib_mb_cur_max (void) __THROW __wur;
 #endif
 
 
@@ -825,6 +827,29 @@
 #endif	/* use MISC || use X/Open Unix */
 
 
+__BEGIN_NAMESPACE_STD
+/* Return the length of the multibyte character
+   in S, which is no longer than N.  */
+extern int mblen (const char *__s, size_t __n) __THROW __wur;
+/* Return the length of the given multibyte character,
+   putting its `wchar_t' representation in *PWC.  */
+extern int mbtowc (wchar_t *__restrict __pwc,
+		   const char *__restrict __s, size_t __n) __THROW __wur;
+/* Put the multibyte character represented
+   by WCHAR in S, returning its length.  */
+extern int wctomb (char *__s, wchar_t __wchar) __THROW __wur;
+
+
+/* Convert a multibyte string to a wide char string.  */
+extern size_t mbstowcs (wchar_t *__restrict  __pwcs,
+			const char *__restrict __s, size_t __n) __THROW;
+/* Convert a wide char string to multibyte string.  */
+extern size_t wcstombs (char *__restrict __s,
+			const wchar_t *__restrict __pwcs, size_t __n)
+     __THROW;
+__END_NAMESPACE_STD
+
+
 #ifdef __USE_SVID
 /* Determine whether the string value of RESPONSE matches the affirmation
    or negative response expression as specified by the LC_MESSAGES category

Regards,
Peter

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