gcc/
[official-gcc.git] / libquadmath / acinclude.m4
blobab73fb52e05420413da60a70e2a5eec9b462c1e5
1 dnl ----------------------------------------------------------------------
2 dnl This whole bit snagged from libgfortran.
4 sinclude(../libtool.m4)
5 dnl The lines below arrange for aclocal not to bring an installed
6 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
7 dnl add a definition of LIBTOOL to Makefile.in.
8 ifelse(,,,[AC_SUBST(LIBTOOL)
9 AC_DEFUN([AM_PROG_LIBTOOL])
10 AC_DEFUN([AC_LIBTOOL_DLOPEN])
11 AC_DEFUN([AC_PROG_LD])
14 dnl Check whether POSIX's signgam is defined in math.h.
15 AC_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>
22 void 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])