On HP-UX 11.31/ia64 with cc, I'm seeing this link error:
cc +DD64 -AC99 -D_HPUX_SOURCE -D_XOPEN_SOURCE=600 -g
-L/home/haible/prefix-hpux113ia64-64-cc/lib -o test-copysignf test-copysignf.o
libtests.a ../gllib/libgnu.a libtests.a
ld: Unsatisfied symbol "_copysignf" in file test-copysignf.o
1 error.
gmake[4]: *** [test-copysignf] Error 1
This patch fixes it.
2020-02-10 Bruno Haible <br...@clisp.org>
copysignf: Fix link error on HP-UX with cc.
* m4/copysignf.m4 (gl_FUNC_COPYSIGNF): Require AC_CANONICAL_HOST. On
HP-UX, set COPYSIGNF_LIBM to -lm.
diff --git a/m4/copysignf.m4 b/m4/copysignf.m4
index c6dea3e..284eb74 100644
--- a/m4/copysignf.m4
+++ b/m4/copysignf.m4
@@ -1,4 +1,4 @@
-# copysignf.m4 serial 3
+# copysignf.m4 serial 4
dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -7,6 +7,7 @@ dnl with or without modifications, as long as this notice is
preserved.
AC_DEFUN([gl_FUNC_COPYSIGNF],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST])
dnl Persuade glibc <math.h> to declare copysignf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
@@ -28,7 +29,12 @@ AC_DEFUN([gl_FUNC_COPYSIGNF],
else
HAVE_COPYSIGNF=0
HAVE_DECL_COPYSIGNF=0
- COPYSIGNF_LIBM=
+ dnl On HP-UX 11.31/ia64, cc has a built-in for copysignf that redirects
+ dnl to the symbol '_copysignf', defined in libm, not libc.
+ case "$host_os" in
+ hpux*) COPYSIGNF_LIBM='-lm' ;;
+ *) COPYSIGNF_LIBM= ;;
+ esac
fi
AC_SUBST([COPYSIGNF_LIBM])
])
