1# cbrtf.m4 serial 4 2dnl Copyright (C) 2012-2021 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_CBRTF], 8[ 9 AC_REQUIRE([gl_MATH_H_DEFAULTS]) 10 AC_REQUIRE([gl_FUNC_CBRT]) 11 12 dnl Persuade glibc <math.h> to declare cbrtf(). 13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) 14 15 dnl Test whether cbrtf() exists. Assume that cbrtf(), if it exists, is 16 dnl defined in the same library as cbrt(). 17 save_LIBS="$LIBS" 18 LIBS="$LIBS $CBRT_LIBM" 19 AC_CHECK_FUNCS([cbrtf]) 20 LIBS="$save_LIBS" 21 if test $ac_cv_func_cbrtf = yes; then 22 CBRTF_LIBM="$CBRT_LIBM" 23 dnl Also check whether it's declared. 24 dnl IRIX 6.5 has cbrtf() in libm but doesn't declare it in <math.h>. 25 AC_CHECK_DECL([cbrtf], , [HAVE_DECL_CBRTF=0], [[#include <math.h>]]) 26 save_LIBS="$LIBS" 27 LIBS="$LIBS $CBRTF_LIBM" 28 gl_FUNC_CBRTF_WORKS 29 LIBS="$save_LIBS" 30 case "$gl_cv_func_cbrtf_works" in 31 *yes) ;; 32 *) REPLACE_CBRTF=1 ;; 33 esac 34 else 35 HAVE_CBRTF=0 36 HAVE_DECL_CBRTF=0 37 fi 38 if test $HAVE_CBRTF = 0 || test $REPLACE_CBRTF = 1; then 39 dnl Find libraries needed to link lib/cbrtf.c. 40 AC_REQUIRE([gl_FUNC_FABSF]) 41 AC_REQUIRE([gl_FUNC_FREXPF]) 42 AC_REQUIRE([gl_FUNC_LDEXPF]) 43 CBRTF_LIBM= 44 dnl Append $FABSF_LIBM to CBRTF_LIBM, avoiding gratuitous duplicates. 45 case " $CBRTF_LIBM " in 46 *" $FABSF_LIBM "*) ;; 47 *) CBRTF_LIBM="$CBRTF_LIBM $FABSF_LIBM" ;; 48 esac 49 dnl Append $FREXPF_LIBM to CBRTF_LIBM, avoiding gratuitous duplicates. 50 case " $CBRTF_LIBM " in 51 *" $FREXPF_LIBM "*) ;; 52 *) CBRTF_LIBM="$CBRTF_LIBM $FREXPF_LIBM" ;; 53 esac 54 dnl Append $LDEXPF_LIBM to CBRTF_LIBM, avoiding gratuitous duplicates. 55 case " $CBRTF_LIBM " in 56 *" $LDEXPF_LIBM "*) ;; 57 *) CBRTF_LIBM="$CBRTF_LIBM $LDEXPF_LIBM" ;; 58 esac 59 fi 60 AC_SUBST([CBRTF_LIBM]) 61]) 62 63dnl Test whether cbrtf() works. 64dnl It returns wrong values on IRIX 6.5. 65AC_DEFUN([gl_FUNC_CBRTF_WORKS], 66[ 67 AC_REQUIRE([AC_PROG_CC]) 68 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles 69 AC_CACHE_CHECK([whether cbrtf works], [gl_cv_func_cbrtf_works], 70 [ 71 AC_RUN_IFELSE( 72 [AC_LANG_SOURCE([[ 73#include <math.h> 74volatile float x; 75volatile float y; 76int main () 77{ 78 extern 79 #ifdef __cplusplus 80 "C" 81 #endif 82 float cbrtf (float); 83 /* This test fails on IRIX 6.5. */ 84 x = - 0.0f; 85 y = cbrtf (x); 86 if (!(y == 0.0f)) 87 return 1; 88 return 0; 89} 90]])], 91 [gl_cv_func_cbrtf_works=yes], 92 [gl_cv_func_cbrtf_works=no], 93 [case "$host_os" in 94 irix*) gl_cv_func_cbrtf_works="guessing no";; 95 # Guess yes on native Windows. 96 mingw*) gl_cv_func_cbrtf_works="guessing yes";; 97 *) gl_cv_func_cbrtf_works="guessing yes";; 98 esac 99 ]) 100 ]) 101]) 102