commit 624d3aebb6e6afadb4f35e894d11b5ebe290cd87
Author: christos <christos>
Date:   Thu May 28 11:47:03 2015 +0000

    avoid gcc-5 optimization malloc + memset = calloc (Fridolin Pokorny)

diff --git a/tc.alloc.c b/tc.alloc.c
index b9aec63..c1cb330 100644
--- a/tc.alloc.c
+++ b/tc.alloc.c
@@ -348,10 +348,13 @@ calloc(size_t i, size_t j)
 {
 #ifndef lint
     char *cp;
+    size_t k;
 
     i *= j;
     cp = xmalloc(i);
-    memset(cp, 0, i);
+    /* Stop gcc 5.x from optimizing malloc+memset = calloc */
+    k = i;
+    memset(cp, 0, k);
 
     return ((memalign_t) cp);
 #else


commit 05e7406049bd2686dee0ee8d819dcd38eb131f6f
Author: christos <christos>
Date:   Tue Jul 7 12:24:54 2015 +0000

    make k volatile to prevent gcc-5 memset() optimization (Fridolin Pokorny)

diff --git a/tc.alloc.c b/tc.alloc.c
index c1cb330..f68a8c5 100644
--- a/tc.alloc.c
+++ b/tc.alloc.c
@@ -348,7 +348,7 @@ calloc(size_t i, size_t j)
 {
 #ifndef lint
     char *cp;
-    size_t k;
+    volatile size_t k;
 
     i *= j;
     cp = xmalloc(i);


commit c43b072b89f19e9b41d45bdf3946593ae9bc6e5e
Author: christos <christos>
Date:   Mon Aug 24 07:08:42 2015 +0000

    restrict BSDWAIT to __GLIBC__ because other linux libraries (muslc) don't
    have the macros.

diff --git a/sh.proc.c b/sh.proc.c
index 76eca3b..ad07250 100644
--- a/sh.proc.c
+++ b/sh.proc.c
@@ -47,7 +47,7 @@ RCSID("$tcsh$")
 # define HZ 16
 #endif /* aiws */
 
-#if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__)
+#if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid) || defined(__GLIBC__)
 # if !defined(__ANDROID__)
 #  define BSDWAIT
 # endif
commit eab72f9797ec4faaf1fb4de491c357f194b84dd6
Author: christos <christos>
Date:   Thu Apr 14 11:09:09 2016 +0000

    GLIBC is getting rid of union wait.

diff --git a/sh.proc.c b/sh.proc.c
index ad07250..5c68409 100644
--- a/sh.proc.c
+++ b/sh.proc.c
@@ -47,11 +47,11 @@ RCSID("$tcsh$")
 # define HZ 16
 #endif /* aiws */
 
-#if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid) || defined(__GLIBC__)
-# if !defined(__ANDROID__)
+#if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid) || defined(__linux__) || defined(__GNU__)
+# if !defined(__ANDROID__) && !defined(__GLIBC__)
 #  define BSDWAIT
 # endif
-#endif /* _BSD || (IRIS4D && __STDC__) || __lucid || glibc */
+#endif /* _BSD || (IRIS4D && __STDC__) || __lucid || gnu-linux */
 #ifndef WTERMSIG
 # define WTERMSIG(w)	(((union wait *) &(w))->w_termsig)
 # ifndef BSDWAIT


diff -Nru tcsh-6.19.00.orig/config/linux tcsh-6.19.00/config/linux
--- tcsh-6.19.00.orig/config/linux	2016-09-22 17:51:43.086924218 +0200
+++ tcsh-6.19.00/config/linux	2016-09-22 17:54:16.123662001 +0200
@@ -86,11 +86,11 @@
  */
 
 #define __STRICT_ANSI__
-#ifndef _BSD_SOURCE
-# define _BSD_SOURCE
+#ifndef _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE
 #endif
-#ifndef _SVID_SOURCE
-# define _SVID_SOURCE
+#ifndef _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE
 #endif
 #ifndef _POSIX_SOURCE
 # define _POSIX_SOURCE