1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
dnl -*- shell-script -*-
dnl
dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
dnl University Research and Technology
dnl Corporation. All rights reserved.
dnl Copyright (c) 2004-2005 The University of Tennessee and The University
dnl of Tennessee Research Foundation. All rights
dnl reserved.
dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
dnl University of Stuttgart. All rights reserved.
dnl Copyright (c) 2004-2005 The Regents of the University of California.
dnl All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
# _OMPI_C_WEAK_SYMBOLS(action_if_found, [action_if_not_found])
# ------------------------------------------------------------
AC_DEFUN([_OMPI_C_WEAK_SYMBOLS],[
# need two files because icc will incorrectly not create the
# symbols if they are not used in the object file in which they
# are defined. Blah!
# To get to compile with icc, have them in a separate header.
cat > conftest_weak.h <<EOF
int real(int i);
int fake(int i);
EOF
cat > conftest_weak.c <<EOF
#include "conftest_weak.h"
#pragma weak fake = real
int real(int i) { return i; }
EOF
cat > conftest.c <<EOF
#include "conftest_weak.h"
int main() { return fake(3); }
EOF
# Try the compile
OMPI_LOG_COMMAND(
[$CC $CFLAGS -c conftest_weak.c],
OMPI_LOG_COMMAND(
[$CC $CFLAGS conftest.c conftest_weak.o -o conftest $LDFLAGS $LIBS],
[ompi_c_weak_symbols_happy=1],
[ompi_c_weak_symbols_happy=0]),
[ompi_c_weak_symbols_happy=0])
AS_IF([test "$ompi_c_weak_symbols_happy" = "1"], [$1], [$2])
unset ompi_c_weak_symbols_happy
rm -f conftest_weak.h conftest_weak.c conftest.c conftest
])
# OMPI_C_WEAK_SYMBOLS()
# ---------------------
# sets OMPI_C_WEAK_SYMBOLS=1 if C compiler has support for weak symbols
AC_DEFUN([OMPI_C_WEAK_SYMBOLS],[
AC_CACHE_CHECK([for weak symbol support],
[ompi_cv_c_weak_symbols],
[_OMPI_C_WEAK_SYMBOLS([ompi_cv_c_weak_symbols="yes"],
[ompi_cv_c_weak_symbols="no"])])
AS_IF([test "$ompi_cv_c_weak_symbols" = "yes"],
[OPAL_C_HAVE_WEAK_SYMBOLS=1], [OPAL_C_HAVE_WEAK_SYMBOLS=0])
]) dnl
|
