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-rw-r--r--m4/float_h.m4108
1 files changed, 108 insertions, 0 deletions
diff --git a/m4/float_h.m4 b/m4/float_h.m4
new file mode 100644
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+++ b/m4/float_h.m4
@@ -0,0 +1,108 @@
+# float_h.m4 serial 12
+dnl Copyright (C) 2007, 2009-2019 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FLOAT_H],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ FLOAT_H=
+ REPLACE_FLOAT_LDBL=0
+ case "$host_os" in
+ aix* | beos* | openbsd* | mirbsd* | irix*)
+ FLOAT_H=float.h
+ ;;
+ freebsd* | dragonfly*)
+ case "$host_cpu" in
+changequote(,)dnl
+ i[34567]86 )
+changequote([,])dnl
+ FLOAT_H=float.h
+ ;;
+ x86_64 )
+ # On x86_64 systems, the C compiler may still be generating
+ # 32-bit code.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined __LP64__ || defined __x86_64__ || defined __amd64__
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [],
+ [FLOAT_H=float.h])
+ ;;
+ esac
+ ;;
+ linux*)
+ case "$host_cpu" in
+ powerpc*)
+ FLOAT_H=float.h
+ ;;
+ esac
+ ;;
+ esac
+ case "$host_os" in
+ aix* | freebsd* | dragonfly* | linux*)
+ if test -n "$FLOAT_H"; then
+ REPLACE_FLOAT_LDBL=1
+ fi
+ ;;
+ esac
+
+ dnl Test against glibc-2.7 Linux/SPARC64 bug.
+ REPLACE_ITOLD=0
+ AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works],
+ [gl_cv_func_itold_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+int i = -1;
+volatile long double ld;
+int main ()
+{
+ ld += i * 1.0L;
+ if (ld > 0)
+ return 1;
+ return 0;
+}]])],
+ [gl_cv_func_itold_works=yes],
+ [gl_cv_func_itold_works=no],
+ [case "$host" in
+ sparc*-*-linux*)
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined __LP64__ || defined __arch64__
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_func_itold_works="guessing no"],
+ [gl_cv_func_itold_works="guessing yes"])
+ ;;
+ # Guess yes on native Windows.
+ mingw*) gl_cv_func_itold_works="guessing yes" ;;
+ *) gl_cv_func_itold_works="guessing yes" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_itold_works" in
+ *no)
+ REPLACE_ITOLD=1
+ dnl We add the workaround to <float.h> but also to <math.h>,
+ dnl to increase the chances that the fix function gets pulled in.
+ FLOAT_H=float.h
+ ;;
+ esac
+
+ if test -n "$FLOAT_H"; then
+ gl_NEXT_HEADERS([float.h])
+ fi
+ AC_SUBST([FLOAT_H])
+ AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"])
+ AC_SUBST([REPLACE_ITOLD])
+])