In C11, provide macros FLT_DECIMAL_DIG, DBL_DECIMAL_DIG, and LDBL_DECIMAL_DIG in <float.h>.

Patch by Jorge Teixeira!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@260577 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Headers/float.h

@@ -68,6 +68,9 @@
 #    undef FLT_TRUE_MIN
 #    undef DBL_TRUE_MIN
 #    undef LDBL_TRUE_MIN
+#    undef FLT_DECIMAL_DIG
+#    undef DBL_DECIMAL_DIG
+#    undef LDBL_DECIMAL_DIG
 #  endif
 #endif
 
@@ -119,6 +122,9 @@
 #  define FLT_TRUE_MIN __FLT_DENORM_MIN__
 #  define DBL_TRUE_MIN __DBL_DENORM_MIN__
 #  define LDBL_TRUE_MIN __LDBL_DENORM_MIN__
+#  define FLT_DECIMAL_DIG __FLT_DECIMAL_DIG__
+#  define DBL_DECIMAL_DIG __DBL_DECIMAL_DIG__
+#  define LDBL_DECIMAL_DIG __LDBL_DECIMAL_DIG__
 #endif
 
 #endif /* __FLOAT_H */

test/Headers/float.c

+// RUN: %clang_cc1 -fsyntax-only -verify -std=c89 -ffreestanding %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c99 -ffreestanding %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c11 -ffreestanding %s
+// expected-no-diagnostics
+
+/* Basic conformance checks against the N1570 draft of C11 Std. */
+/*
+    5.2.4.2.2p11, pp. 30
+*/
+#include <float.h>
+
+#ifndef FLT_RADIX
+    #error "Mandatory macro FLT_RADIX is missing."
+#elif   FLT_RADIX < 2
+    #error "Mandatory macro FLT_RADIX is invalid."
+#endif
+
+
+#ifndef FLT_MANT_DIG
+    #error "Mandatory macro FLT_MANT_DIG is missing."
+#elif   FLT_MANT_DIG < 1
+    #error "Mandatory macro FLT_MANT_DIG is invalid."
+#endif
+#ifndef DBL_MANT_DIG
+    #error "Mandatory macro DBL_MANT_DIG is missing."
+#elif   DBL_MANT_DIG < 1
+    #error "Mandatory macro DBL_MANT_DIG is invalid."
+#endif
+#ifndef LDBL_MANT_DIG
+    #error "Mandatory macro LDBL_MANT_DIG is missing."
+#elif   LDBL_MANT_DIG < 1
+    #error "Mandatory macro LDBL_MANT_DIG is invalid."
+#endif
+#if ((FLT_MANT_DIG > DBL_MANT_DIG) || (DBL_MANT_DIG > LDBL_MANT_DIG))
+    #error "Mandatory macros {FLT,DBL,LDBL}_MANT_DIG are invalid."
+#endif
+
+
+#if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
+    #ifndef FLT_DECIMAL_DIG
+        #error "Mandatory macro FLT_DECIMAL_DIG is missing."
+    #elif   FLT_DECIMAL_DIG < 6
+        #error "Mandatory macro FLT_DECIMAL_DIG is invalid."
+    #endif
+    #ifndef DBL_DECIMAL_DIG
+        #error "Mandatory macro DBL_DECIMAL_DIG is missing."
+    #elif   DBL_DECIMAL_DIG < 10
+        #error "Mandatory macro DBL_DECIMAL_DIG is invalid."
+    #endif
+    #ifndef LDBL_DECIMAL_DIG
+        #error "Mandatory macro LDBL_DECIMAL_DIG is missing."
+    #elif   LDBL_DECIMAL_DIG < 10
+        #error "Mandatory macro LDBL_DECIMAL_DIG is invalid."
+    #endif
+    #if ((FLT_DECIMAL_DIG > DBL_DECIMAL_DIG) || (DBL_DECIMAL_DIG > LDBL_DECIMAL_DIG))
+        #error "Mandatory macros {FLT,DBL,LDBL}_DECIMAL_DIG are invalid."
+    #endif
+#else
+    #ifdef FLT_DECIMAL_DIG
+        #error "Macro FLT_DECIMAL_DIG should not be defined."
+    #endif
+    #ifdef DBL_DECIMAL_DIG
+        #error "Macro DBL_DECIMAL_DIG should not be defined."
+    #endif
+    #ifdef LDBL_DECIMAL_DIG
+        #error "Macro LDBL_DECIMAL_DIG should not be defined."
+    #endif
+#endif
+
+
+#ifndef DECIMAL_DIG
+    #error "Mandatory macro DECIMAL_DIG is missing."
+#elif   DECIMAL_DIG < 10
+    #error "Mandatory macro DECIMAL_DIG is invalid."
+#endif
+
+
+#ifndef FLT_DIG
+    #error "Mandatory macro FLT_DIG is missing."
+#elif   FLT_DIG < 6
+    #error "Mandatory macro FLT_DIG is invalid."
+#endif
+#ifndef DBL_DIG
+    #error "Mandatory macro DBL_DIG is missing."
+#elif   DBL_DIG < 10
+    #error "Mandatory macro DBL_DIG is invalid."
+#endif
+#ifndef LDBL_DIG
+    #error "Mandatory macro LDBL_DIG is missing."
+#elif   LDBL_DIG < 10
+    #error "Mandatory macro LDBL_DIG is invalid."
+#endif
+#if ((FLT_DIG > DBL_DIG) || (DBL_DIG > LDBL_DIG))
+    #error "Mandatory macros {FLT,DBL,LDBL}_DIG, are invalid."
+#endif
+
+
+#ifndef FLT_MIN_EXP
+    #error "Mandatory macro _MIN_EXP is missing."
+#elif   FLT_MIN_EXP > -2
+    #error "Mandatory macro _MIN_EXP is invalid."
+#endif
+#ifndef DBL_MIN_EXP
+    #error "Mandatory macro DBL_MIN_EXP is missing."
+#elif   DBL_MIN_EXP > -2
+    #error "Mandatory macro DBL_MIN_EXP is invalid."
+#endif
+#ifndef LDBL_MIN_EXP
+    #error "Mandatory macro LDBL_MIN_EXP is missing."
+#elif   LDBL_MIN_EXP > -2
+    #error "Mandatory macro LDBL_MIN_EXP is invalid."
+#endif
+#if ((FLT_MIN_EXP < DBL_MIN_EXP) || (DBL_MIN_EXP < LDBL_MIN_EXP))
+    #error "Mandatory macros {FLT,DBL,LDBL}_MIN_EXP are invalid."
+#endif
+
+
+#ifndef FLT_MIN_10_EXP
+    #error "Mandatory macro FLT_MIN_10_EXP is missing."
+#elif   FLT_MIN_10_EXP > -37
+    #error "Mandatory macro FLT_MIN_10_EXP is invalid."
+#endif
+#ifndef DBL_MIN_10_EXP
+    #error "Mandatory macro DBL_MIN_10_EXP is missing."
+#elif   DBL_MIN_10_EXP > -37
+    #error "Mandatory macro DBL_MIN_10_EXP is invalid."
+#endif
+#ifndef LDBL_MIN_10_EXP
+    #error "Mandatory macro LDBL_MIN_10_EXP is missing."
+#elif   LDBL_MIN_10_EXP > -37
+    #error "Mandatory macro LDBL_MIN_10_EXP is invalid."
+#endif
+#if ((FLT_MIN_10_EXP < DBL_MIN_10_EXP) || (DBL_MIN_10_EXP < LDBL_MIN_10_EXP))
+    #error "Mandatory macros {FLT,DBL,LDBL}_MIN_10_EXP are invalid."
+#endif
+
+
+#ifndef FLT_MAX_EXP
+    #error "Mandatory macro FLT_MAX_EXP is missing."
+#elif   FLT_MAX_EXP < 2
+    #error "Mandatory macro FLT_MAX_EXP is invalid."
+#endif
+#ifndef DBL_MAX_EXP
+    #error "Mandatory macro DBL_MAX_EXP is missing."
+#elif   DBL_MAX_EXP < 2
+    #error "Mandatory macro DBL_MAX_EXP is invalid."
+#endif
+#ifndef LDBL_MAX_EXP
+    #error "Mandatory macro LDBL_MAX_EXP is missing."
+#elif   LDBL_MAX_EXP < 2
+    #error "Mandatory macro LDBL_MAX_EXP is invalid."
+#endif
+#if ((FLT_MAX_EXP > DBL_MAX_EXP) || (DBL_MAX_EXP > LDBL_MAX_EXP))
+    #error "Mandatory macros {FLT,DBL,LDBL}_MAX_EXP are invalid."
+#endif
+
+
+#ifndef FLT_MAX_10_EXP
+    #error "Mandatory macro FLT_MAX_10_EXP is missing."
+#elif   FLT_MAX_10_EXP < 37
+    #error "Mandatory macro FLT_MAX_10_EXP is invalid."
+#endif
+#ifndef DBL_MAX_10_EXP
+    #error "Mandatory macro DBL_MAX_10_EXP is missing."
+#elif   DBL_MAX_10_EXP < 37
+    #error "Mandatory macro DBL_MAX_10_EXP is invalid."
+#endif
+#ifndef LDBL_MAX_10_EXP
+    #error "Mandatory macro LDBL_MAX_10_EXP is missing."
+#elif   LDBL_MAX_10_EXP < 37
+    #error "Mandatory macro LDBL_MAX_10_EXP is invalid."
+#endif
+#if ((FLT_MAX_10_EXP > DBL_MAX_10_EXP) || (DBL_MAX_10_EXP > LDBL_MAX_10_EXP))
+    #error "Mandatory macros {FLT,DBL,LDBL}_MAX_10_EXP are invalid."
+#endif
+
+
+/* Internal consistency checks */
+_Static_assert(FLT_RADIX == __FLT_RADIX__, "");
+
+_Static_assert(FLT_MANT_DIG == __FLT_MANT_DIG__, "");
+_Static_assert(DBL_MANT_DIG == __DBL_MANT_DIG__, "");
+_Static_assert(LDBL_MANT_DIG == __LDBL_MANT_DIG__, "");
+
+#if __STDC_VERSION__ >= 201112L || !defined(__STRICT_ANSI__)
+_Static_assert(FLT_DECIMAL_DIG == __FLT_DECIMAL_DIG__, "");
+_Static_assert(DBL_DECIMAL_DIG == __DBL_DECIMAL_DIG__, "");
+_Static_assert(LDBL_DECIMAL_DIG == __LDBL_DECIMAL_DIG__, "");
+#endif
+
+_Static_assert(DECIMAL_DIG == __DECIMAL_DIG__, "");
+
+_Static_assert(FLT_DIG == __FLT_DIG__, "");
+_Static_assert(DBL_DIG == __DBL_DIG__, "");
+_Static_assert(LDBL_DIG == __LDBL_DIG__, "");
+
+_Static_assert(FLT_MIN_EXP == __FLT_MIN_EXP__, "");
+_Static_assert(DBL_MIN_EXP == __DBL_MIN_EXP__, "");
+_Static_assert(LDBL_MIN_EXP == __LDBL_MIN_EXP__, "");
+
+_Static_assert(FLT_MIN_10_EXP == __FLT_MIN_10_EXP__, "");
+_Static_assert(DBL_MIN_10_EXP == __DBL_MIN_10_EXP__, "");
+_Static_assert(LDBL_MIN_10_EXP == __LDBL_MIN_10_EXP__, "");
+
+_Static_assert(FLT_MAX_EXP == __FLT_MAX_EXP__, "");
+_Static_assert(DBL_MAX_EXP == __DBL_MAX_EXP__, "");
+_Static_assert(LDBL_MAX_EXP == __LDBL_MAX_EXP__, "");
+
+_Static_assert(FLT_MAX_10_EXP == __FLT_MAX_10_EXP__, "");
+_Static_assert(DBL_MAX_10_EXP == __DBL_MAX_10_EXP__, "");
+_Static_assert(LDBL_MAX_10_EXP == __LDBL_MAX_10_EXP__, "");