[build] standardize on -fvisibility=hidden for all targets

Enables -fvisibility=hidden for iOS and Linux, and adds a workaround for GCC 6.3-7.1
Adds a GCC 6 build
Enables diagnostics for C files
Fixes a shadow warning in parsedate.c

1 files changed, 9 insertions, 9 deletions

diff --git a/src/parsedate/parsedate.c b/src/parsedate/parsedate.c
index 46acceed75..7228c4edbc 100644
--- a/src/parsedate/parsedate.c
+++ b/src/parsedate/parsedate.c
@@ -418,7 +418,7 @@ static time_t my_timegm(struct my_tm *tm)
 {
   static const int month_days_cumulative [12] =
     { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
-  int month, year, leap_days;
+  int month_, year, leap_days;
 
   if(tm->tm_year < 70)
     /* we don't support years before 1970 as they will cause this function
@@ -426,14 +426,14 @@ static time_t my_timegm(struct my_tm *tm)
     return -1;
 
   year = tm->tm_year + 1900;
-  month = tm->tm_mon;
-  if(month < 0) {
-    year += (11 - month) / 12;
-    month = 11 - (11 - month) % 12;
+  month_ = tm->tm_mon;
+  if(month_ < 0) {
+    year += (11 - month_) / 12;
+    month_ = 11 - (11 - month_) % 12;
   }
-  else if(month >= 12) {
-    year -= month / 12;
-    month = month % 12;
+  else if(month_ >= 12) {
+    year -= month_ / 12;
+    month_ = month_ % 12;
   }
 
   leap_days = year - (tm->tm_mon <= 1);
@@ -441,7 +441,7 @@ static time_t my_timegm(struct my_tm *tm)
                - (1969 / 4) + (1969 / 100) - (1969 / 400));
 
   return ((((time_t) (year - 1970) * 365
-            + leap_days + month_days_cumulative [month] + tm->tm_mday - 1) * 24
+            + leap_days + month_days_cumulative [month_] + tm->tm_mday - 1) * 24
            + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec;
 }