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stdlib: Fix macro expansion producing 'defined' has undefined behavior 

The FPIOCONST_HAVE_EXTENDED_RANGE is defined as:

  #define FPIOCONST_HAVE_EXTENDED_RANGE \
    ((!defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024) \
    || __HAVE_DISTINCT_FLOAT128)

Which is undefined behavior accordingly to C Standard (Preprocessing
directives, p4).

Checked on x86_64-linux-gnu.
This commit is contained in:
Adhemerval Zanella 2022-03-09 15:36:53 -03:00
parent e57d8fc97b
commit 6c4ee1aba1
1 changed files with 6 additions and 3 deletions
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9
stdlib/fpioconst.h
View File

@ -52,9 +52,12 @@
- LDBL_MIN_EXP + 2)). When _Float128 is enabled in libm and it is
ABI-distinct from long double (e.g. on powerpc64le), we also need powers
of 10 up to floor (log_2 (FLT128_MANT_DIG - FLT128_MIN_EXP + 2)). */
#define FPIOCONST_HAVE_EXTENDED_RANGE \
((!defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024) \
|| __HAVE_DISTINCT_FLOAT128)
#if (!defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024) \
|| __HAVE_DISTINCT_FLOAT128
# define FPIOCONST_HAVE_EXTENDED_RANGE 1
#else
# define FPIOCONST_HAVE_EXTENDED_RANGE 0
#endif
#if FPIOCONST_HAVE_EXTENDED_RANGE
# define FPIOCONST_POW10_ARRAY_SIZE 15