Enable build on IBM i platform (#1630)

* No perfstat for IBM i (OS400) AIX variant
* Allow for future IBM i to identify as 'os400'

2 files changed, 11 insertions, 2 deletions

diff --git a/configure.py b/configure.py
index 0393cdd..529c0e9 100755
--- a/configure.py
+++ b/configure.py
@@ -60,6 +60,8 @@ class Platform(object):
             self._platform = 'netbsd'
         elif self._platform.startswith('aix'):
             self._platform = 'aix'
+        elif self._platform.startswith('os400'):
+            self._platform = 'os400'
         elif self._platform.startswith('dragonfly'):
             self._platform = 'dragonfly'
 
@@ -97,6 +99,9 @@ class Platform(object):
     def is_aix(self):
         return self._platform == 'aix'
 
+    def is_os400_pase(self):
+        return self._platform == 'os400' or os.uname().sysname.startswith('OS400')
+
     def uses_usr_local(self):
         return self._platform in ('freebsd', 'openbsd', 'bitrig', 'dragonfly', 'netbsd')
 
@@ -536,7 +541,7 @@ if platform.is_msvc():
 else:
     libs.append('-lninja')
 
-if platform.is_aix():
+if platform.is_aix() and not platform.is_os400_pase():
     libs.append('-lperfstat')
 
 all_targets = []
diff --git a/src/util.cc b/src/util.cc
index f80616b..666cf9d 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -45,7 +45,7 @@
 #elif defined(__SVR4) && defined(__sun)
 #include <unistd.h>
 #include <sys/loadavg.h>
-#elif defined(_AIX)
+#elif defined(_AIX) && !defined(__PASE__)
 #include <libperfstat.h>
 #elif defined(linux) || defined(__GLIBC__)
 #include <sys/sysinfo.h>
@@ -562,6 +562,10 @@ double GetLoadAverage() {
 
   return posix_compatible_load;
 }
+#elif defined(__PASE__)
+double GetLoadAverage() {
+  return -0.0f;
+}
 #elif defined(_AIX)
 double GetLoadAverage() {
   perfstat_cpu_total_t cpu_stats;