[core] Y2038: use _TIME_BITS=64 on 32-bit glibc

Y2038: use _TIME_BITS=64 on 32-bit glibc platforms

reference:
https://www.phoronix.com/scan.php?page=news_item&px=Glibc-More-Y2038-Work

SConstruct

@@ -294,6 +294,7 @@ if env['CC'] == 'gcc':
 	env.Append(CCFLAGS = Split('-pipe -Wall -O2 -g -W -pedantic -Wunused -Wshadow -std=gnu99'))
 
 env.Append(CPPFLAGS = [
+	'-D_TIME_BITS=64',
 	'-D_FILE_OFFSET_BITS=64',
 	'-D_LARGEFILE_SOURCE',
 	'-D_LARGE_FILES',

configure.ac

@@ -1553,7 +1553,7 @@ AC_ARG_ENABLE([lfs],
 )
 AC_MSG_RESULT([$ENABLE_LFS])
 if test "$ENABLE_LFS" = yes; then
-  CPPFLAGS="${CPPFLAGS} -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGE_FILES"
+  CPPFLAGS="${CPPFLAGS} -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGE_FILES"
   AC_SYS_LARGEFILE
 fi
 

src/CMakeLists.txt

@@ -11,7 +11,7 @@ include(FindPkgConfig)
 
 include(LighttpdMacros)
 
-add_definitions(-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGE_FILES -D_DEFAULT_SOURCE)
+add_definitions(-D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGE_FILES -D_DEFAULT_SOURCE)
 
 # default to ON
 set(CMAKE_POSITION_INDEPENDENT_CODE ON CACHE BOOL "Default value for ``POSITION_INDEPENDENT_CODE`` of targets.")

src/first.h

@@ -21,6 +21,16 @@
 #define _Float32  float
 #endif
 
+/* enable glibc Y2038 64-bit time_t (where available on 32-bit systems) */
+#ifdef _ILP32
+#ifndef _TIME_BITS
+#define _TIME_BITS 64
+#endif
+#ifndef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 64
+#endif
+#endif
+
 
 #include <sys/types.h>
 #include <stddef.h>
@@ -60,6 +70,8 @@
  #elif defined(__TIMESIZE)
   #if __TIMESIZE == 64
    #define HAS_TIME_BITS64 1
+  #elif defined(__USE_TIME_BITS64)
+   #define HAS_TIME_BITS64 1
   #else
    #define HAS_TIME_BITS64 0
   #endif
@@ -70,6 +82,7 @@
    #define HAS_TIME_BITS64 0
   #endif
  #elif defined(_ILP32) \
+   && !defined(__USE_TIME_BITS64) \
    && !defined(__NetBSD__) && !defined(__OpenBSD__) \
    && (!defined(__FreeBSD__) || !defined(__i386__)) \
    && !(defined(__APPLE__) && defined(__MACH__))

src/meson.build

@@ -8,6 +8,7 @@ include_base_paths = [
 ]
 
 defs = [
+	'-D_TIME_BITS=64',
 	'-D_FILE_OFFSET_BITS=64',
 	'-D_LARGEFILE_SOURCE',
 	'-D_LARGE_FILES',