GNU C Library master sources branch master updated. glibc-2.28.9000-6-gf6dcefb

[jsm28 at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=f6dcefbe607e7c190388c11db0a80a80e6ce9686

commit f6dcefbe607e7c190388c11db0a80a80e6ce9686
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Aug 1 22:22:00 2018 +0000

    Fix math/test-misc.c for undefined fenv.h macros.
    
    math/test-misc.c contains some code that uses fenv.h macros
    FE_UNDERFLOW, FE_OVERFLOW and FE_UPWARD without being conditional on
    those macros being defined.
    
    That would normally break the build for configurations (typically
    soft-float) not defining those macros.  However, the code in question
    is inside LDBL_MANT_DIG > DBL_MANT_DIG conditionals.  And, while we
    have configurations lacking rounding mode and exception support where
    LDBL_MANT_DIG > DBL_MANT_DIG (soft-float MIPS64 and RISC-V), those
    configurations currently define the fenv.h macros in question even for
    soft-float.
    
    There may be some case for defining those macros in cases where a
    soft-float compilation could use a hard-float libm (where both
    soft-float and hard-float can use the same ABI, as on ARM and RISC-V,
    for example).  But MIPS is not such a case - the hard-float and
    soft-float ABIs are incompatible - and thus I am testing a patch to
    stop defining those macros for soft-float MIPS (motivated by reducing
    the extent to which architectures need their own definitions of
    math-tests.h macros - if lack of rounding mode / exception support can
    be determined by the lack of macros in fenv.h, that avoids the need
    for math-tests.h to declare that lack as well).  Introducing a case of
    LDBL_MANT_DIG > DBL_MANT_DIG without these macros defined shows up the
    problem with math/test-misc.c.  This patch then fixes that problem by
    adding appropriate conditionals.
    
    Tested for MIPS64 in conjunction with changes to stop defining the
    macros in question in bits/fenv.h for soft-float.
    
    	* math/test-misc.c (do_test) [LDBL_MANT_DIG > DBL_MANT_DIG]: Make
    	code using FE_UNDERFLOW conditional on [FE_UNDERFLOW], code using
    	FE_OVERFLOW conditional on [FE_OVERFLOW] and code using FE_UPWARD
    	conditional on [FE_UPWARD].

diff --git a/ChangeLog b/ChangeLog
index dc3a445..d8994e7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2018-08-01  Joseph Myers  <joseph@codesourcery.com>
+
+	* math/test-misc.c (do_test) [LDBL_MANT_DIG > DBL_MANT_DIG]: Make
+	code using FE_UNDERFLOW conditional on [FE_UNDERFLOW], code using
+	FE_OVERFLOW conditional on [FE_OVERFLOW] and code using FE_UPWARD
+	conditional on [FE_UPWARD].
+
 2018-08-01  Paul Eggert  <eggert@cs.ucla.edu>
 
 	regex: fix memory leak in Gnulib
diff --git a/math/test-misc.c b/math/test-misc.c
index c5cfb34..963e1e7 100644
--- a/math/test-misc.c
+++ b/math/test-misc.c
@@ -976,11 +976,13 @@ do_test (void)
 	puts ("scalbl (LDBL_MIN, 2147483647) returns -Inf");
 	result = 1;
       }
+# ifdef FE_UNDERFLOW
     else if (fetestexcept (FE_UNDERFLOW))
       {
 	puts ("scalbl (LDBL_MIN, 2147483647) raises underflow exception");
 	result = 1;
       }
+# endif
 
     feclearexcept (FE_ALL_EXCEPT);
     r = scalbl (LDBL_MAX, -2147483647);
@@ -994,11 +996,13 @@ do_test (void)
 	puts ("scalbl (LDBL_MAX, -2147483647) returns -Inf");
 	result = 1;
       }
+# ifdef FE_OVERFLOW
     else if (fetestexcept (FE_OVERFLOW))
       {
 	puts ("scalbl (LDBL_MAX, -2147483647) raises overflow exception");
 	result = 1;
       }
+# endif
   }
 #endif
 
@@ -1178,6 +1182,7 @@ do_test (void)
 	}
     }
 
+#  ifdef FE_UPWARD
   volatile long double ld7 = nextafterl (0.0L, 1.0L);
   volatile double d7;
   (void) &ld7;
@@ -1195,6 +1200,7 @@ do_test (void)
       else
 	puts ("ignoring this failure");
     }
+#  endif
 # endif
 #endif
 

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog        |    7 +++++++
 math/test-misc.c |    6 ++++++
 2 files changed, 13 insertions(+), 0 deletions(-)


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