X-Git-Url: https://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=aclocal.m4;h=72954be317dfd8af79b8199fd7a656b4cfcb8872;hb=3183ac61c6bf0a75ee65dc8cbebf54f7c143df46;hp=320cb18f7e6e0e3b4b8e6b0176701cc189ab370e;hpb=79b07cae47a6fa064aa4d2ea70fe930884751eb4;p=ncurses.git

diff --git a/aclocal.m4 b/aclocal.m4
index 320cb18f..72954be3 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -29,7 +29,7 @@ dnl***************************************************************************
 dnl
 dnl Author: Thomas E. Dickey 1995-on
 dnl
-dnl $Id: aclocal.m4,v 1.1004 2022/02/05 17:48:07 tom Exp $
+dnl $Id: aclocal.m4,v 1.1007 2022/07/27 23:34:31 tom Exp $
 dnl Macros used in NCURSES auto-configuration script.
 dnl
 dnl These macros are maintained separately from NCURSES.  The copyright on
@@ -6094,7 +6094,7 @@ CF_UPPER(cf_map_lib_basename,$2)
 eval $1="\$${cf_map_lib_basename}_NAME"
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MATH_LIB version: 10 updated: 2020/12/31 18:40:20
+dnl CF_MATH_LIB version: 11 updated: 2022/07/27 19:01:48
 dnl -----------
 dnl Checks for libraries.  At least one UNIX system, Apple Macintosh
 dnl Rhapsody 5.5, does not have -lm.  We cannot use the simpler
@@ -6104,18 +6104,42 @@ AC_DEFUN([CF_MATH_LIB],
 AC_CACHE_CHECK(if -lm needed for math functions,
 	cf_cv_need_libm,[
 	AC_TRY_LINK([
-	#include <stdio.h>
-	#include <stdlib.h>
-	#include <math.h>
+		#include <stdio.h>
+		#include <stdlib.h>
+		#include <math.h>
 	],
 	[double x = rand(); printf("result = %g\\n", ]ifelse([$2],,sin(x),$2)[)],
 	[cf_cv_need_libm=no],
 	[cf_cv_need_libm=yes])])
+
 if test "$cf_cv_need_libm" = yes
 then
-ifelse($1,,[
-	CF_ADD_LIB(m)
-],[$1=-lm])
+
+	cf_save_LIBS="$LIBS"
+	LIBS="$LIBS -lm"
+	AC_CACHE_CHECK(if -lm is available for math functions,
+	cf_cv_have_libm,[
+	AC_TRY_LINK([
+		#include <stdio.h>
+		#include <stdlib.h>
+		#include <math.h>
+	],
+	[double x = rand(); printf("result = %g\\n", ]ifelse([$2],,sin(x),$2)[)],
+	[cf_cv_have_libm=yes],
+	[cf_cv_have_libm=no])])
+	LIBS="$cf_save_LIBS"
+
+	if test "$cf_cv_have_libm" = yes
+	then
+		ifelse($1,,[CF_ADD_LIB(m)],[$1=-lm])
+	fi
+else
+	cf_cv_have_libm=yes
+fi
+
+if test "$cf_cv_have_libm" = yes
+then
+	AC_DEFINE(HAVE_MATH_FUNCS,1,[Define to 1 if math functions are available])
 fi
 ])
 dnl ---------------------------------------------------------------------------