Commit | Line | Data |
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005de2e8 | 1 | # log1p.m4 serial 3 |
af07e104 | 2 | dnl Copyright (C) 2012-2013 Free Software Foundation, Inc. |
005de2e8 LC |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | AC_DEFUN([gl_FUNC_LOG1P], | |
8 | [ | |
9 | m4_divert_text([DEFAULTS], [gl_log1p_required=plain]) | |
10 | AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
11 | ||
12 | dnl Persuade glibc <math.h> to declare log1p(). | |
13 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
14 | ||
15 | dnl Determine LOG1P_LIBM. | |
16 | gl_COMMON_DOUBLE_MATHFUNC([log1p]) | |
17 | ||
18 | dnl Test whether log1p() exists. | |
19 | save_LIBS="$LIBS" | |
20 | LIBS="$LIBS $LOG1P_LIBM" | |
21 | AC_CHECK_FUNCS([log1p]) | |
22 | LIBS="$save_LIBS" | |
23 | if test $ac_cv_func_log1p = yes; then | |
24 | : | |
25 | m4_ifdef([gl_FUNC_LOG1P_IEEE], [ | |
26 | if test $gl_log1p_required = ieee && test $REPLACE_LOG1P = 0; then | |
27 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
28 | AC_CACHE_CHECK([whether log1p works according to ISO C 99 with IEC 60559], | |
29 | [gl_cv_func_log1p_ieee], | |
30 | [ | |
31 | save_LIBS="$LIBS" | |
32 | LIBS="$LIBS $LOG1P_LIBM" | |
33 | AC_RUN_IFELSE( | |
34 | [AC_LANG_SOURCE([[ | |
35 | #ifndef __NO_MATH_INLINES | |
36 | # define __NO_MATH_INLINES 1 /* for glibc */ | |
37 | #endif | |
38 | #include <math.h> | |
39 | ]gl_DOUBLE_MINUS_ZERO_CODE[ | |
40 | ]gl_DOUBLE_SIGNBIT_CODE[ | |
41 | static double dummy (double x) { return 0; } | |
42 | int main (int argc, char *argv[]) | |
43 | { | |
44 | double (*my_log1p) (double) = argc ? log1p : dummy; | |
45 | /* This test fails on AIX, HP-UX 11. */ | |
46 | double y = my_log1p (minus_zerod); | |
47 | if (!(y == 0.0) || (signbitd (minus_zerod) && !signbitd (y))) | |
48 | return 1; | |
49 | return 0; | |
50 | } | |
51 | ]])], | |
52 | [gl_cv_func_log1p_ieee=yes], | |
53 | [gl_cv_func_log1p_ieee=no], | |
54 | [case "$host_os" in | |
55 | # Guess yes on glibc systems. | |
56 | *-gnu*) gl_cv_func_log1p_ieee="guessing yes" ;; | |
57 | # If we don't know, assume the worst. | |
58 | *) gl_cv_func_log1p_ieee="guessing no" ;; | |
59 | esac | |
60 | ]) | |
61 | LIBS="$save_LIBS" | |
62 | ]) | |
63 | case "$gl_cv_func_log1p_ieee" in | |
64 | *yes) ;; | |
65 | *) REPLACE_LOG1P=1 ;; | |
66 | esac | |
67 | fi | |
68 | ]) | |
69 | else | |
70 | HAVE_LOG1P=0 | |
71 | fi | |
72 | if test $HAVE_LOG1P = 0 || test $REPLACE_LOG1P = 1; then | |
73 | dnl Find libraries needed to link lib/log1p.c. | |
74 | AC_REQUIRE([gl_FUNC_ISNAND]) | |
75 | AC_REQUIRE([gl_FUNC_LOG]) | |
76 | AC_REQUIRE([gl_FUNC_ROUND]) | |
77 | LOG1P_LIBM= | |
78 | dnl Append $ISNAND_LIBM to LOG1P_LIBM, avoiding gratuitous duplicates. | |
79 | case " $LOG1P_LIBM " in | |
80 | *" $ISNAND_LIBM "*) ;; | |
81 | *) LOG1P_LIBM="$LOG1P_LIBM $ISNAND_LIBM" ;; | |
82 | esac | |
83 | dnl Append $LOG_LIBM to LOG1P_LIBM, avoiding gratuitous duplicates. | |
84 | case " $LOG1P_LIBM " in | |
85 | *" $LOG_LIBM "*) ;; | |
86 | *) LOG1P_LIBM="$LOG1P_LIBM $LOG_LIBM" ;; | |
87 | esac | |
88 | dnl Append $ROUND_LIBM to LOG1P_LIBM, avoiding gratuitous duplicates. | |
89 | case " $LOG1P_LIBM " in | |
90 | *" $ROUND_LIBM "*) ;; | |
91 | *) LOG1P_LIBM="$LOG1P_LIBM $ROUND_LIBM" ;; | |
92 | esac | |
93 | fi | |
94 | ]) |