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Fix: Declare getopt function on older GNU libc #73

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Fix: Declare getopt function on older GNU libc #73

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9 changes: 8 additions & 1 deletion include/getopt.h
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Original file line number Diff line number Diff line change
Expand Up @@ -104,7 +104,14 @@ struct option
declaration without arguments. If it is 0, we checked and failed
to find the declaration so provide a fully prototyped one. If it
is 1, we found it so don't provide any declaration at all. */
#if !HAVE_DECL_GETOPT
/* On GNU libc <= 2,25, <unistd.h> includes <getopt.h> with __need_getopt
macro defined. That <getopt.h> is intended to be a part of GNU libc
but <unistd.h> actually includes THIS getopt.h. If HAVE_DECL_GETOPT is
defined to 1 and this file is included from GNU libc's <unistd.h>,
declaration of getopt is suppressed, causing errors on getopt callers.
To avoid not defining proper getopt declaration, we have to check
__need_getopt macro when built with GNU libc to detect this include path. */
#if !HAVE_DECL_GETOPT || (defined (__GNU_LIBRARY__) && defined (__need_getopt))
#if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)
/* Many other libraries have conflicting prototypes for getopt, with
differences in the consts, in unistd.h. To avoid compilation
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