Mercurial > gnulib
annotate m4/expm1.m4 @ 40196:e63f5d3edab5
relocatable-prog: Update documentation.
* doc/relocatable-maint.texi (Supporting Relocation): Update to match
the recent changes.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 24 Feb 2019 01:49:15 +0100 |
| parents | e2e6dc79463b |
| children |
| rev | line source |
|---|---|
|
40109
e2e6dc79463b
Defeat current GCC optimizations in math autoconf tests.
Bruno Haible <bruno@clisp.org>
parents:
40057
diff
changeset
|
1 # expm1.m4 serial 6 |
|
40057
b06060465f09
maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
parents:
19484
diff
changeset
|
2 dnl Copyright (C) 2010-2019 Free Software Foundation, Inc. |
| 16581 | 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_EXPM1], | |
| 8 [ | |
| 16588 | 9 m4_divert_text([DEFAULTS], [gl_expm1_required=plain]) |
| 16581 | 10 AC_REQUIRE([gl_MATH_H_DEFAULTS]) |
| 11 | |
| 12 dnl Persuade glibc <math.h> to declare expm1(). | |
| 13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
| 14 | |
| 15 EXPM1_LIBM= | |
| 16 AC_CACHE_CHECK([whether expm1() can be used without linking with libm], | |
| 17 [gl_cv_func_expm1_no_libm], | |
| 18 [ | |
| 19 AC_LINK_IFELSE( | |
| 20 [AC_LANG_PROGRAM( | |
| 21 [[#ifndef __NO_MATH_INLINES | |
| 22 # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 23 #endif | |
| 24 #include <math.h> | |
| 25 double (*funcptr) (double) = expm1; | |
| 26 double x;]], | |
| 27 [[return funcptr (x) > 0.5 | |
| 28 || expm1 (x) > 0.5;]])], | |
| 29 [gl_cv_func_expm1_no_libm=yes], | |
| 30 [gl_cv_func_expm1_no_libm=no]) | |
| 31 ]) | |
| 32 if test $gl_cv_func_expm1_no_libm = no; then | |
| 33 AC_CACHE_CHECK([whether expm1() can be used with libm], | |
| 34 [gl_cv_func_expm1_in_libm], | |
| 35 [ | |
| 36 save_LIBS="$LIBS" | |
| 37 LIBS="$LIBS -lm" | |
| 38 AC_LINK_IFELSE( | |
| 39 [AC_LANG_PROGRAM( | |
| 40 [[#ifndef __NO_MATH_INLINES | |
| 41 # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 42 #endif | |
| 43 #include <math.h> | |
| 44 double (*funcptr) (double) = expm1; | |
| 45 double x;]], | |
| 46 [[return funcptr (x) > 0.5 | |
| 47 || expm1 (x) > 0.5;]])], | |
| 48 [gl_cv_func_expm1_in_libm=yes], | |
| 49 [gl_cv_func_expm1_in_libm=no]) | |
| 50 LIBS="$save_LIBS" | |
| 51 ]) | |
| 52 if test $gl_cv_func_expm1_in_libm = yes; then | |
| 53 EXPM1_LIBM=-lm | |
| 54 fi | |
| 55 fi | |
| 16588 | 56 if test $gl_cv_func_expm1_no_libm = yes \ |
| 57 || test $gl_cv_func_expm1_in_libm = yes; then | |
| 58 : | |
| 59 m4_ifdef([gl_FUNC_EXPM1_IEEE], [ | |
| 60 if test $gl_expm1_required = ieee && test $REPLACE_EXPM1 = 0; then | |
|
16811
b187fc49964b
Avoid "guessing no" guesses when cross-compiling to glibc systems.
Bruno Haible <bruno@clisp.org>
parents:
16588
diff
changeset
|
61 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
| 16588 | 62 AC_CACHE_CHECK([whether expm1 works according to ISO C 99 with IEC 60559], |
| 63 [gl_cv_func_expm1_ieee], | |
| 64 [ | |
| 65 save_LIBS="$LIBS" | |
| 66 LIBS="$LIBS $EXPM1_LIBM" | |
| 67 AC_RUN_IFELSE( | |
| 68 [AC_LANG_SOURCE([[ | |
| 69 #ifndef __NO_MATH_INLINES | |
| 70 # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 71 #endif | |
| 72 #include <math.h> | |
| 73 ]gl_DOUBLE_MINUS_ZERO_CODE[ | |
| 74 ]gl_DOUBLE_SIGNBIT_CODE[ | |
| 75 static double dummy (double x) { return 0; } | |
| 76 int main (int argc, char *argv[]) | |
| 77 { | |
|
40109
e2e6dc79463b
Defeat current GCC optimizations in math autoconf tests.
Bruno Haible <bruno@clisp.org>
parents:
40057
diff
changeset
|
78 double (* volatile my_expm1) (double) = argc ? expm1 : dummy; |
| 16588 | 79 double y = my_expm1 (minus_zerod); |
| 80 if (!(y == 0.0) || (signbitd (minus_zerod) && !signbitd (y))) | |
| 81 return 1; | |
| 82 return 0; | |
| 83 } | |
| 84 ]])], | |
| 85 [gl_cv_func_expm1_ieee=yes], | |
| 86 [gl_cv_func_expm1_ieee=no], | |
|
16811
b187fc49964b
Avoid "guessing no" guesses when cross-compiling to glibc systems.
Bruno Haible <bruno@clisp.org>
parents:
16588
diff
changeset
|
87 [case "$host_os" in |
|
19479
4bc5b8cefed7
Add cross-compilation results for GNU/Hurd.
Samuel Thibault <samuel.thibault@gnu.org>
parents:
18993
diff
changeset
|
88 # Guess yes on glibc systems. |
|
4bc5b8cefed7
Add cross-compilation results for GNU/Hurd.
Samuel Thibault <samuel.thibault@gnu.org>
parents:
18993
diff
changeset
|
89 *-gnu* | gnu*) gl_cv_func_expm1_ieee="guessing yes" ;; |
|
4bc5b8cefed7
Add cross-compilation results for GNU/Hurd.
Samuel Thibault <samuel.thibault@gnu.org>
parents:
18993
diff
changeset
|
90 # Guess yes on native Windows. |
|
4bc5b8cefed7
Add cross-compilation results for GNU/Hurd.
Samuel Thibault <samuel.thibault@gnu.org>
parents:
18993
diff
changeset
|
91 mingw*) gl_cv_func_expm1_ieee="guessing yes" ;; |
|
4bc5b8cefed7
Add cross-compilation results for GNU/Hurd.
Samuel Thibault <samuel.thibault@gnu.org>
parents:
18993
diff
changeset
|
92 # If we don't know, assume the worst. |
|
4bc5b8cefed7
Add cross-compilation results for GNU/Hurd.
Samuel Thibault <samuel.thibault@gnu.org>
parents:
18993
diff
changeset
|
93 *) gl_cv_func_expm1_ieee="guessing no" ;; |
|
16811
b187fc49964b
Avoid "guessing no" guesses when cross-compiling to glibc systems.
Bruno Haible <bruno@clisp.org>
parents:
16588
diff
changeset
|
94 esac |
|
b187fc49964b
Avoid "guessing no" guesses when cross-compiling to glibc systems.
Bruno Haible <bruno@clisp.org>
parents:
16588
diff
changeset
|
95 ]) |
| 16588 | 96 LIBS="$save_LIBS" |
| 97 ]) | |
| 98 case "$gl_cv_func_expm1_ieee" in | |
| 99 *yes) ;; | |
| 100 *) REPLACE_EXPM1=1 ;; | |
| 101 esac | |
| 102 fi | |
| 103 ]) | |
| 104 else | |
| 16581 | 105 HAVE_EXPM1=0 |
| 16588 | 106 fi |
| 107 if test $HAVE_EXPM1 = 0 || test $REPLACE_EXPM1 = 1; then | |
| 16581 | 108 dnl Find libraries needed to link lib/expm1.c. |
| 109 AC_REQUIRE([gl_FUNC_ISNAND]) | |
| 110 AC_REQUIRE([gl_FUNC_EXP]) | |
| 111 AC_REQUIRE([gl_FUNC_ROUND]) | |
| 112 AC_REQUIRE([gl_FUNC_LDEXP]) | |
| 113 EXPM1_LIBM= | |
| 114 dnl Append $ISNAND_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates. | |
| 115 case " $EXPM1_LIBM " in | |
| 116 *" $ISNAND_LIBM "*) ;; | |
| 117 *) EXPM1_LIBM="$EXPM1_LIBM $ISNAND_LIBM" ;; | |
| 118 esac | |
| 119 dnl Append $EXP_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates. | |
| 120 case " $EXPM1_LIBM " in | |
| 121 *" $EXP_LIBM "*) ;; | |
| 122 *) EXPM1_LIBM="$EXPM1_LIBM $EXP_LIBM" ;; | |
| 123 esac | |
| 124 dnl Append $ROUND_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates. | |
| 125 case " $EXPM1_LIBM " in | |
| 126 *" $ROUND_LIBM "*) ;; | |
| 127 *) EXPM1_LIBM="$EXPM1_LIBM $ROUND_LIBM" ;; | |
| 128 esac | |
| 129 dnl Append $LDEXP_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates. | |
| 130 case " $EXPM1_LIBM " in | |
| 131 *" $LDEXP_LIBM "*) ;; | |
| 132 *) EXPM1_LIBM="$EXPM1_LIBM $LDEXP_LIBM" ;; | |
| 133 esac | |
| 134 fi | |
| 135 AC_SUBST([EXPM1_LIBM]) | |
| 136 ]) |