1dnl ---------------------------------------------------------------------- 2dnl This whole bit snagged from libgfortran. 3 4sinclude(../libtool.m4) 5dnl The lines below arrange for aclocal not to bring an installed 6dnl libtool.m4 into aclocal.m4, while still arranging for automake to 7dnl add a definition of LIBTOOL to Makefile.in. 8ifelse(,,,[AC_SUBST(LIBTOOL) 9AC_DEFUN([AM_PROG_LIBTOOL]) 10AC_DEFUN([AC_LIBTOOL_DLOPEN]) 11AC_DEFUN([AC_PROG_LD]) 12]) 13 14dnl Check whether POSIX's signgam is defined in math.h. 15AC_DEFUN([LIBQUAD_CHECK_MATH_H_SIGNGAM], [ 16 AC_CACHE_CHECK([whether the math.h includes POSIX's signgam], 17 libgfor_cv_have_math_h_signgam, [ 18 save_CFLAGS="$CFLAGS" 19 CFLAGS="$CFLAGS -Werror" 20 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ 21#include <math.h> 22void foo(void) { signgam = 1; }]], [])], 23 libgfor_cv_have_math_h_signgam=yes, 24 libgfor_cv_have_math_h_signgam=no) 25 CFLAGS="$save_CFLAGS"]) 26 if test $libgfor_cv_have_math_h_signgam = yes; then 27 AC_DEFINE(HAVE_MATH_H_SIGNGAM, 1, 28 [Define to 1 if the math.h includes POSIX's signgam.]) 29 fi]) 30