make error: static declaration of 'isnumber' follows non-static declaration on macOS #2
Description
gcc -Wall -O3 -o subsync subsync.c
subsync.c:117:12: error: static declaration of 'isnumber' follows non-static declaration
static int isnumber(char *s);
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/_ctype.h:323:1: note:
previous definition is here
isnumber(int _c)
^
subsync.c:606:12: error: static declaration of 'isnumber' follows non-static declaration
static int isnumber(char *s)
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/_ctype.h:323:1: note:
previous definition is here
isnumber(int _c)
^
because isnumber is an BSD Library Function, see man page of isnumber on macOS:
ISDIGIT(3) BSD Library Functions Manual ISDIGIT(3)
NAME
isdigit, isnumber -- decimal-digit character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isdigit(int c);
int
isnumber(int c);
DESCRIPTION
The isdigit() function tests for a decimal digit character. Regardless of locale,
this includes the following characters only:
``0'' ``1'' ``2'' ``3'' ``4''
``5'' ``6'' ``7'' ``8'' ``9''
The isnumber() function behaves similarly to isdigit(), but may recognize additional
characters, depending on the current locale setting.
The value of the argument must be representable as an unsigned char or the value of
EOF.
RETURN VALUES
The isdigit() and isnumber() functions return zero if the character tests false and
return non-zero if the character tests true.
COMPATIBILITY
The 4.4BSD extension of accepting arguments outside of the range of the unsigned
char type in locales with large character sets is considered obsolete and may not be
supported in future releases. The iswdigit() function should be used instead.
SEE ALSO
ctype(3), isalnum_l(3), iswdigit(3), multibyte(3), ascii(7)
STANDARDS
The isdigit() function conforms to ISO/IEC 9899:1990 (``ISO C90'').
BSD May 4, 2007 BSDSuggestion: rename function isnumber to is_number_string.