From ce11f0fee9b9a4bfd18a4d4b9eeb276af12c5610 Mon Sep 17 00:00:00 2001
From: Thomas Roessler <roessler@does-not-exist.org>
Date: Thu, 11 May 2000 06:04:39 +0000
Subject: [PATCH] Check volatility of sig_atomic_t.

---
 acconfig.h   |  4 ++++
 configure.in | 26 ++++++++++++++++++++++++--
 globals.h    |  6 +++---
 3 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/acconfig.h b/acconfig.h
index ce77e651..f038d19c 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -175,3 +175,7 @@
 /* Define if you have resizeterm, as a function or macro.  */
 #undef HAVE_RESIZETERM
 
+/* Some systems declare sig_atomic_t as volatile, smome others -- no.
+ * This define will have value `sig_atomic_t' or `volatile sig_atomic_t'
+ * accordingly. */
+#undef SIG_ATOMIC_VOLATILE_T
diff --git a/configure.in b/configure.in
index 1c515af1..904391dc 100644
--- a/configure.in
+++ b/configure.in
@@ -217,8 +217,30 @@ AC_TYPE_SIGNAL
 
 AC_MSG_CHECKING(for sig_atomic_t in signal.h)
 AC_EGREP_HEADER(sig_atomic_t,signal.h,dnl
-  [ ac_cv_type_sig_atomic_t=yes; AC_MSG_RESULT(yes) ],dnl
-  AC_MSG_RESULT(no); AC_CHECK_TYPE(sig_atomic_t, int))
+  [
+    ac_cv_type_sig_atomic_t=yes;
+    AC_EGREP_HEADER(volatile.*sig_atomic_t,
+                    signal.h,
+                    [
+                        is_sig_atomic_t_volatile=yes;
+                        AC_MSG_RESULT([yes, volatile])
+                    ],
+                    [
+                        is_sig_atomic_t_volatile=no;
+                        AC_MSG_RESULT([yes, non volatile])
+                    ])
+  ],
+  [
+    AC_MSG_RESULT(no)
+    AC_CHECK_TYPE(sig_atomic_t, int)
+    is_sig_atomic_t_volatile=no
+  ])
+if test $is_sig_atomic_t_volatile = 'yes'
+then
+    AC_DEFINE(SIG_ATOMIC_VOLATILE_T, sig_atomic_t)
+else
+    AC_DEFINE(SIG_ATOMIC_VOLATILE_T, [volatile sig_atomic_t])
+fi
 
 AC_DECL_SYS_SIGLIST
 
diff --git a/globals.h b/globals.h
index e2d3c3a0..47c3cdfc 100644
--- a/globals.h
+++ b/globals.h
@@ -135,9 +135,9 @@ WHERE short ScoreThresholdRead;
 WHERE short ScoreThresholdFlag;
 
 /* flags for received signals */
-WHERE volatile sig_atomic_t SigAlrm INITVAL (0);
-WHERE volatile sig_atomic_t SigInt INITVAL (0);
-WHERE volatile sig_atomic_t SigWinch INITVAL (0);
+WHERE SIG_ATOMIC_VOLATILE_T SigAlrm INITVAL (0);
+WHERE SIG_ATOMIC_VOLATILE_T SigInt INITVAL (0);
+WHERE SIG_ATOMIC_VOLATILE_T SigWinch INITVAL (0);
 
 WHERE int CurrentMenu;
 
-- 
2.40.0