patch 8.2.2056: configure fails when building with implicit-function-declaration
Problem: Configure fails when building with the
"implicit-function-declaration" error enabled, specifically on Mac.
Solution: Declear the functions like in the source code. (suggestion by
Clemens Lang, closes #7380)
diff --git a/src/configure.ac b/src/configure.ac
index 457f2b8..010cc8f 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -3593,7 +3593,15 @@
AC_MSG_CHECKING(for SVR4 ptys)
if test -c /dev/ptmx ; then
- AC_TRY_LINK([], [ptsname(0);grantpt(0);unlockpt(0);],
+ AC_TRY_LINK([
+// These should be in stdlib.h, but it depends on _XOPEN_SOURCE.
+char *ptsname(int);
+int unlockpt(int);
+int grantpt(int);
+ ], [
+ ptsname(0);
+ grantpt(0);
+ unlockpt(0);],
AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SVR4_PTYS),
AC_MSG_RESULT(no))
else