1 # ====================================================================
5 # Maths library compatibility related configuration data
7 # ====================================================================
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40 # ====================================================================
41 ######DESCRIPTIONBEGIN####
44 # Original data: jlarmour
48 #####DESCRIPTIONEND####
50 # ====================================================================
52 cdl_interface CYGINT_LIBM_COMPAT {
53 requires 1 == CYGINT_LIBM_COMPAT
56 cdl_option CYGSEM_LIBM_COMPAT_IEEE_ONLY {
59 implements CYGINT_LIBM_COMPAT
61 The math library can be hard-coded to only
62 behave in one compatibility mode - IEEE. This
63 cannot be changed at run-time. IEEE mode is the
64 most minimal of the compatibility modes, and so
65 this will best help code size and speed, as well
66 as omitting the code for other compatibility
67 modes. If not defined, the math library can be
68 set at run-time to any of the supported
72 cdl_component CYGNUM_LIBM_COMPATIBILITY {
73 display "Default mode"
76 implements CYGINT_LIBM_COMPAT
77 legal_values { "POSIX" "IEEE" "XOPEN" "SVID" }
78 default_value { "POSIX" }
79 define CYGPKG_LIBM_COMPATIBILITY_DEFAULT
81 If you want to have support for more than one
82 compatibility mode settable at run-time, rather
83 than hard-coded IEEE mode, this component lets
84 you choose which mode should be the default."
86 cdl_option CYGNUM_LIBM_COMPAT_DEFAULT {
87 display "Numeric representation"
90 CYGNUM_LIBM_COMPATIBILITY == "POSIX" ? "CYGNUM_LIBM_COMPAT_POSIX" :\
91 CYGNUM_LIBM_COMPATIBILITY == "IEEE" ? "CYGNUM_LIBM_COMPAT_IEEE" :\
92 CYGNUM_LIBM_COMPATIBILITY == "XOPEN" ? "CYGNUM_LIBM_COMPAT_XOPEN" :\
93 CYGNUM_LIBM_COMPATIBILITY == "SVID" ? "CYGNUM_LIBM_COMPAT_SVID" :\
97 This option automatically defines the default compatibility
98 mode for numeric representation in terms of the values used
99 to set that mode at run-time."
103 cdl_option CYGFUN_LIBM_SVID3_scalb {
104 display "SVID3-style scalb()"
107 SVID3 defined the scalb() function as double
108 scalb(double, double) rather than double
109 scalb(double, int) which is used by IBM, DEC, and
110 probably others. Enabling this option chooses
111 the (double, double) version. Note there is a
112 function double scalbn(double, int) which is
113 unaffected by this choice."
116 cdl_option CYGSYM_LIBM_NO_XOPEN_SVID_NAMESPACE_POLLUTION {
117 display "Reduce namespace pollution"
120 If you do not want to use either the X/Open or
121 SVID3 compatibility modes, you may want to define
122 this option to reduce the chance of namespace
123 pollution. This is particularly likely to occur
124 here as these standards define symbols with
125 names that often appear in applications, such as
126 exception, DOMAIN, OVERFLOW, etc. If your
127 application also used these names, it may cause
131 cdl_option CYGSEM_LIBM_USE_STDERR {
132 display "Output to stderr for math errors"
133 requires !CYGSEM_LIBM_COMPAT_IEEE_ONLY
134 requires CYGPKG_LIBC_STDIO
137 The SVID3 standard says that error
138 messages should be output on the stderr console
139 output stream. This option allows this ability
140 to be explicitly controlled. However, this still
141 only has an effect in SVID3 compatibility mode."