From 8aaa59ec8d096d892b315c8fe691c4eca306ba01 Mon Sep 17 00:00:00 2001
From: "Z. Liu" <zhixu.liu@gmail.com>
Date: Sat, 24 Aug 2024 23:01:29 +0800
Subject: fix undesired compilation error(s) of feature test

If don't fix, the feature test will generate undesired .h which will be used
in later compilation, some will cause build failed.

see *.h{1,2} for details, run following cmd to see difference:
  diff -uprN <(more *.h1|sed 's:\.h1$:.h:g') <(more *.h2|sed 's:\.h2$:.h:g')

found by using clang 18 with CFLAGS: -Wall

link of debian's patches is: https://salsa.debian.org/debian/runit/-/tree/master/debian/patches
  0029-fix-ftbfs-with-gcc14.patch

chkshsgr.c trycpp.c trypoll.c tryshsgr.c tryulong64.c:
  error: call to undeclared function '...'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  functions are: _exit, exit, getgroups, printf, setgroups

tryflock.c trysgact.c trysgprm.c trywaitp.c:
  error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
---
 src/chkshsgr.c   | 1 +
 src/trycpp.c     | 3 +++
 src/tryflock.c   | 2 +-
 src/trypoll.c    | 1 +
 src/trysgact.c   | 2 +-
 src/trysgprm.c   | 2 +-
 src/tryshsgr.c   | 3 +++
 src/tryulong64.c | 2 ++
 src/trywaitp.c   | 2 +-
 9 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/src/chkshsgr.c b/src/chkshsgr.c
index 38c352d..a33403b 100644
--- a/src/chkshsgr.c
+++ b/src/chkshsgr.c
@@ -1,6 +1,7 @@
 /* Public domain. */
 
 #include <unistd.h>
+#include <grp.h>
 
 int main()
 {
diff --git a/src/trycpp.c b/src/trycpp.c
index e4503d4..70bc8d6 100644
--- a/src/trycpp.c
+++ b/src/trycpp.c
@@ -1,5 +1,8 @@
 /* Public domain. */
 
+#include <stdio.h>
+#include <stdlib.h>
+
 int main()
 {
 #ifdef NeXT
diff --git a/src/tryflock.c b/src/tryflock.c
index a82ffc2..68599d3 100644
--- a/src/tryflock.c
+++ b/src/tryflock.c
@@ -4,7 +4,7 @@
 #include <sys/file.h>
 #include <fcntl.h>
 
-main()
+int main()
 {
   flock(0,LOCK_EX | LOCK_UN | LOCK_NB);
 }
diff --git a/src/trypoll.c b/src/trypoll.c
index 6506617..ae36929 100644
--- a/src/trypoll.c
+++ b/src/trypoll.c
@@ -1,5 +1,6 @@
 /* Public domain. */
 
+#include <unistd.h>
 #include <sys/types.h>
 #include <fcntl.h>
 #include <poll.h>
diff --git a/src/trysgact.c b/src/trysgact.c
index e264ef2..841b88a 100644
--- a/src/trysgact.c
+++ b/src/trysgact.c
@@ -2,7 +2,7 @@
 
 #include <signal.h>
 
-main()
+int main()
 {
   struct sigaction sa;
   sa.sa_handler = 0;
diff --git a/src/trysgprm.c b/src/trysgprm.c
index a46c82c..3e78a82 100644
--- a/src/trysgprm.c
+++ b/src/trysgprm.c
@@ -2,7 +2,7 @@
 
 #include <signal.h>
 
-main()
+int main()
 {
   sigset_t ss;
  
diff --git a/src/tryshsgr.c b/src/tryshsgr.c
index c5ed6d6..1bb5f61 100644
--- a/src/tryshsgr.c
+++ b/src/tryshsgr.c
@@ -1,5 +1,8 @@
 /* Public domain. */
 
+#include <unistd.h>
+#include <grp.h>
+
 int main()
 {
   short x[4];
diff --git a/src/tryulong64.c b/src/tryulong64.c
index 003548a..a4b9839 100644
--- a/src/tryulong64.c
+++ b/src/tryulong64.c
@@ -1,5 +1,7 @@
 /* Public domain. */
 
+#include <unistd.h>
+
 int main()
 {
   unsigned long u;
diff --git a/src/trywaitp.c b/src/trywaitp.c
index 319b81f..76b3329 100644
--- a/src/trywaitp.c
+++ b/src/trywaitp.c
@@ -3,7 +3,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 
-main()
+int main()
 {
   waitpid(0,0,0);
 }
-- 
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