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Avoid implicit function declarations in the configure script #111

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4 changes: 3 additions & 1 deletion autoconf/hercules.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,7 @@ AC_DEFUN([_HC_CHECK_NEED_GETOPT_WRAPPER],
Will the linker complain about duplicate
symbols for getopt? We'll soon find out!
*/
int getopt(int, char *const[], const char *);
extern char *optarg;
extern int optind;

Expand All @@ -315,6 +316,7 @@ DUPGETOPT1
needs getopt. Will linker complain about
duplicate symbols for getopt? Let's see.
*/
int getopt(int, char *const[], const char *);
extern char *optarg;
extern int optind;
extern int test2();
Expand Down Expand Up @@ -385,7 +387,7 @@ AC_DEFUN([HC_CHECK_NEED_GETOPT_OPTRESET],
[hc_cv_need_getopt_optreset],
[
AC_TRY_LINK(
[],
[int getopt(int, char *const[], const char *);],
[
extern int optreset;
optreset=1;
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1 change: 1 addition & 0 deletions configure.ac
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Expand Up @@ -1168,6 +1168,7 @@ if test "$GCC" = "yes"; then

-g -O2 -fomit-frame-pointer
*/
#include <string.h>

int foo ()
{
Expand Down