[PATCH] libcpp: Do not assume st_mtime has type time_t

[Shiva S]

POSIX specifies that st_mtime has type time_t, but some hosts declare
it with a different type, so its address cannot be passed to
localtime.  Copy it to a time_t first.

Bootstrapped and regression-tested on x86_64-pc-linux-gnu
(default languages, --disable-multilib), with no new regressions
relative to the unmodified baseline.

Also tested with a non-GCC, EDG-based host compiler (GNU extensions
disabled) on a non-glibc platform, where the patch resolves a build
failure.

libcpp/ChangeLog:

        * macro.cc (_cpp_builtin_macro_text) <BT_TIMESTAMP>: Copy st_mtime
        to a time_t before calling localtime.

Signed-off-by: Shiva <shivasubraman...@outlook.com>
---
 libcpp/macro.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libcpp/macro.cc b/libcpp/macro.cc
index 736c360336d..f6f2dae55a5 100644
--- a/libcpp/macro.cc
+++ b/libcpp/macro.cc
@@ -593,7 +593,10 @@ _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode 
*node,
                struct tm *tb = NULL;
                struct stat *st = _cpp_get_file_stat (file);
                if (st)
-                 tb = localtime (&st->st_mtime);
+                 {
+                   time_t mtime = st->st_mtime;
+                   tb = localtime (&mtime);
+                 }
                if (tb)
                  {
                    char *str = asctime (tb);