commit 4482d0009a99b1773f2426479b666b08f57af9d5
Author: Mark Wielaard <mark@klomp.org>
Date:   Thu Feb 15 14:44:18 2018 +0100

    Include sys/ptrace.h as early as possible.
    
    On some systems, at least on Fedora 27 ppc64le with glibc 2.26-24 and
    kernel 4.14.18-300, including sys/ptrace.h late (after signal.h or
    sys/wait.h for example) will cause issues and produce errors like:
    
    In file included from /usr/include/asm/sigcontext.h:12:0,
                     from /usr/include/bits/sigcontext.h:30,
                     from /usr/include/signal.h:287,
                     from /usr/include/sys/wait.h:36,
                     from linux-pid-attach.c:38:
    /usr/include/sys/ptrace.h:73:3: error: expected identifier before numeric constant
       PTRACE_GETREGS = 12,
       ^
    
    Swapping the include order fixes these issues.
    
    Signed-off-by: Mark Wielaard <mark@klomp.org>

diff --git a/backends/ppc_initreg.c b/backends/ppc_initreg.c
index 69d623b..3e4432f 100644
--- a/backends/ppc_initreg.c
+++ b/backends/ppc_initreg.c
@@ -30,13 +30,14 @@
 # include <config.h>
 #endif
 
-#include "system.h"
 #include <stdlib.h>
 #if defined(__powerpc__) && defined(__linux__)
-# include <sys/user.h>
 # include <sys/ptrace.h>
+# include <sys/user.h>
 #endif
 
+#include "system.h"
+
 #define BACKEND ppc_
 #include "libebl_CPU.h"
 
diff --git a/libdwfl/linux-pid-attach.c b/libdwfl/linux-pid-attach.c
index e6a5c41..2ab4109 100644
--- a/libdwfl/linux-pid-attach.c
+++ b/libdwfl/linux-pid-attach.c
@@ -35,7 +35,6 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <sys/wait.h>
 #include <dirent.h>
 #include <unistd.h>
 
@@ -43,6 +42,7 @@
 
 #include <sys/ptrace.h>
 #include <sys/syscall.h>
+#include <sys/wait.h>
 
 static bool
 linux_proc_pid_is_stopped (pid_t pid)
diff --git a/tests/backtrace-child.c b/tests/backtrace-child.c
index 2c27414..9c6ba94 100644
--- a/tests/backtrace-child.c
+++ b/tests/backtrace-child.c
@@ -81,7 +81,6 @@
 #include <config.h>
 #include <assert.h>
 #include <stdlib.h>
-#include <signal.h>
 #include <errno.h>
 #include <string.h>
 #include <pthread.h>
@@ -100,6 +99,7 @@ main (int argc __attribute__ ((unused)), char **argv)
 
 #else /* __linux__ */
 #include <sys/ptrace.h>
+#include <signal.h>
 
 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
 #define NOINLINE_NOCLONE __attribute__ ((noinline, noclone))
diff --git a/tests/backtrace-dwarf.c b/tests/backtrace-dwarf.c
index 2dc8a9a..7ff826c 100644
--- a/tests/backtrace-dwarf.c
+++ b/tests/backtrace-dwarf.c
@@ -17,7 +17,6 @@
 
 #include <config.h>
 #include <assert.h>
-#include <signal.h>
 #include <inttypes.h>
 #include <stdio_ext.h>
 #include <locale.h>
@@ -25,7 +24,6 @@
 #include <error.h>
 #include <unistd.h>
 #include <sys/types.h>
-#include <sys/wait.h>
 #include ELFUTILS_HEADER(dwfl)
 
 #ifndef __linux__
@@ -40,6 +38,8 @@ main (int argc __attribute__ ((unused)), char **argv)
 
 #else /* __linux__ */
 #include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <signal.h>
 
 #define main cleanup_13_main
 #include "cleanup-13.c"