kc3-lang/gnulib/doc/posix-headers/float.texi

• Show log

  Commit

• Hash : 3d1b90b4
  Author :
  Date : 2024-12-27T23:14:08
  

  Rename module float to float-h.
  
  * modules/float-h: Renamed from modules/float.
  * modules/float-h-tests: Renamed from modules/float-tests.
  * modules/float-h-c++-tests: Renamed from modules/float-c++-tests.
  * tests/test-float-h.c: Renamed from tests/test-float.c.
  * tests/test-float-h-c++.cc: Renamed from tests/test-float-c++.cc.
  * tests/test-float-h-c++2.cc: Renamed from tests/test-float-c++2.cc.
  * doc/posix-headers/float.texi: Update.
  * modules/* (Depends-on): Update.
  * modules/float: New file.
  

Download

• doc/posix-headers/float.texi

• @node float.h
  @section @file{float.h}
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/float.h.html}
  
  Gnulib module: float-h
  @mindex float-h
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  The conversion from @code{int} to @code{long double} in incorrect on some
  platforms:
  glibc 2.7 on Linux/SPARC64.
  @item
  The values of @code{LDBL_*} macros are incorrect on some platforms:
  On OpenBSD 4.0 and MirBSD 10, they are the same as the values of the
  @code{DBL_*} macros, although @samp{long double} is a larger type than
  @samp{double}.
  On FreeBSD/x86 6.4, they represent the incorrect 53-bit precision assumptions
  in the compiler, not the real 64-bit precision at runtime.
  On Linux/PowerPC with GCC 4.4, and on AIX 7.1 with GCC 4.2,
  they don't reflect the ``double double'' representation of @code{long double}
  correctly.
  @item
  The macros
  @code{FLT_HAS_SUBNORM}, @code{FLT_DECIMAL_DIG}, @code{FLT_TRUE_MIN},
  @code{DBL_HAS_SUBNORM}, @code{DBL_DECIMAL_DIG}, @code{DBL_TRUE_MIN},
  @code{LDBL_HAS_SUBNORM}, @code{LDBL_DECIMAL_DIG}, @code{LDBL_TRUE_MIN},
  that were added in ISO C 11, are missing on some platforms:
  gcc 4.5.4, clang 7, Solaris 11.3 with Sun C.
  @item
  The macro @code{LDBL_DECIMAL_DIG} is missing on some platforms:
  MSVC 14.
  @item
  The value of macro @code{FLT_TRUE_MIN} is not a @code{float} on some platforms:
  AIX 7.1 with xlc.
  @item
  The macros
  @code{FLT_IS_IEC_60559}, @code{FLT_NORM_MAX}, @code{FLT_SNAN},
  @code{DBL_IS_IEC_60559}, @code{DBL_NORM_MAX}, @code{DBL_SNAN},
  @code{LDBL_IS_IEC_60559}, @code{LDBL_NORM_MAX}, @code{LDBL_SNAN},
  that were added in ISO C 23, are missing on some platforms:
  gcc 14 without @code{-std=c23} or @code{-std=gnu23}, clang 18, musl libc 1.2.5, AIX 7.3 with xlclang, Solaris 11.3 with Sun C, MSVC 14.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  The macro @code{FLT_ROUNDS} is a constant expression and does not represent
  the current rounding mode on some platforms:
  glibc 2.11, HP-UX 11, mingw.
  @item
  The value of @code{FLT_TRUE_MIN} is not a constant on some platforms:
  FreeBSD/x86.
  @item
  The values of @code{FLT_SNAN}, @code{DBL_SNAN}, @code{LDBL_SNAN} are not
  constants on some platforms:
  AIX 7.3 with xlclang, and all platforms which use the gnulib replacements.
  @end itemize
  

Download