Enable C99 features in C++11

[komh]

Hi/2.

Some C99 features in C++11 are not enabled. For example, INT64_C() of stdint.h and long long stuffs. Especially, long long stuffs disables _GLIBCXX_USE_C99 feature of libstdc++-v3. As a result, many C99 functions such as lldiv() are missing in std namespace. #14 is releated to this.

[komh]

Here is the patch. I've added macros to enable those features as built-in. Because we cannot fix kLIBC headers. If kLIBC headers are fixed, this patch except os_defines.h is unnecessary.

From 1e73f8d3899f95dc6664e8e5876b2ed452203a1f Mon Sep 17 00:00:00 2001
From: KO Myung-Hun <komh@chollian.net>
Date: Tue, 16 Feb 2016 15:36:58 +0900
Subject: [PATCH] OS/2: Enable C99 stuffs in C++11

C++11 supports some C99 features. However OS/2 kLIBC headers do not
support them well.

To workaround, define some feature test macros as built-in. They are

    __STDC_CONSTANT_MACROS
    __STDC_LIMIT_MACROS
    __LONG_LONG_SUPPORTED

Especially, __LONG_LONG_SUPPORTED enables _GLIBCXX_USE_C99 feature in
libstdc++-v3, which use -std=c++98 to test C99 features in C++.

    modified:   gcc/config/i386/emx.h
    modified:   libstdc++-v3/config/os/os2/os_defines.h
---
 gcc/config/i386/emx.h                   | 11 +++++++++++
 libstdc++-v3/config/os/os2/os_defines.h |  5 +++++
 2 files changed, 16 insertions(+)

diff --git a/gcc/config/i386/emx.h b/gcc/config/i386/emx.h
index 474d2ec..855297b 100644
--- a/gcc/config/i386/emx.h
+++ b/gcc/config/i386/emx.h
@@ -380,6 +380,17 @@ do {                                   \
             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
             builtin_define ("_Cdecl=__attribute__((__cdecl__))");       \
           }                                                             \
+        if (c_dialect_cxx ())                                           \
+          {                                                             \
+            if (cxx_dialect >= cxx11)                                   \
+              {                                                         \
+                builtin_define ("__STDC_CONSTANT_MACROS");              \
+                builtin_define ("__STDC_LIMIT_MACROS");                 \
+              }                                                         \
+            if (cxx_dialect >= cxx11 ||                                 \
+                flag_iso /* For _GLIBCXX_USE_C99 of libstdc++-v3) */)   \
+              builtin_define ("__LONG_LONG_SUPPORTED");                 \
+          }                                                             \
    builtin_define_std ("__KLIBC__=0");     \
    builtin_define_std ("__KLIBC_MINOR__=6");       \
    builtin_define_std ("__KLIBC_PATCHLEVEL__=3");      \
diff --git a/libstdc++-v3/config/os/os2/os_defines.h b/libstdc++-v3/config/os/os2/os_defines.h
index 50ea322..3bfe3ef 100644
--- a/libstdc++-v3/config/os/os2/os_defines.h
+++ b/libstdc++-v3/config/os/os2/os_defines.h
@@ -33,4 +33,9 @@
 // System-specific #define, typedefs, corrections, etc, go here.  This
 // file will come before all others.

+#define _GLIBCXX_USE_C99_CHECK 1
+#define _GLIBCXX_USE_C99_DYNAMIC (!(__ISO_C_VISIBLE >= 1999))
+#define _GLIBCXX_USE_C99_LONG_LONG_CHECK 1
+#define _GLIBCXX_USE_C99_LONG_LONG_DYNAMIC (_GLIBCXX_USE_C99_DYNAMIC || !defined __LONG_LONG_SUPPORTED)
+
 #endif
-- 
2.7.0

[komh]

Pushed as commit fef1630c35955e6352f9734b43d20758ce7508be.