71 строка
2.4 KiB
Bash
71 строка
2.4 KiB
Bash
dnl -*- shell-script -*-
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dnl
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dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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dnl University Research and Technology
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dnl Corporation. All rights reserved.
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dnl Copyright (c) 2004-2005 The University of Tennessee and The University
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dnl of Tennessee Research Foundation. All rights
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dnl reserved.
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dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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dnl University of Stuttgart. All rights reserved.
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dnl Copyright (c) 2004-2005 The Regents of the University of California.
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dnl All rights reserved.
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dnl $COPYRIGHT$
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dnl
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dnl Additional copyrights may follow
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dnl
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dnl $HEADER$
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dnl
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# _OMPI_C_WEAK_SYMBOLS(action_if_found, [action_if_not_found])
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# ------------------------------------------------------------
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AC_DEFUN([_OMPI_C_WEAK_SYMBOLS],[
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# need two files because icc will incorrectly not create the
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# symbols if they are not used in the object file in which they
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# are defined. Blah!
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# To get to compile with icc, have them in a separate header.
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cat > conftest_weak.h <<EOF
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int real(int i);
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int fake(int i);
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EOF
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cat > conftest_weak.c <<EOF
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#include "conftest_weak.h"
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#pragma weak fake = real
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int real(int i) { return i; }
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EOF
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cat > conftest.c <<EOF
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#include "conftest_weak.h"
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int main() { return fake(3); }
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EOF
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# Try the compile
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OPAL_LOG_COMMAND(
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[$CC $CFLAGS -c conftest_weak.c],
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OPAL_LOG_COMMAND(
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[$CC $CFLAGS conftest.c conftest_weak.o -o conftest $LDFLAGS $LIBS],
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[ompi_c_weak_symbols_happy=1],
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[ompi_c_weak_symbols_happy=0]),
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[ompi_c_weak_symbols_happy=0])
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AS_IF([test "$ompi_c_weak_symbols_happy" = "1"], [$1], [$2])
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unset ompi_c_weak_symbols_happy
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rm -f conftest_weak.h conftest_weak.c conftest.c conftest
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])
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# OMPI_C_WEAK_SYMBOLS()
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# ---------------------
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# sets OMPI_C_WEAK_SYMBOLS=1 if C compiler has support for weak symbols
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AC_DEFUN([OMPI_C_WEAK_SYMBOLS],[
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AC_CACHE_CHECK([for weak symbol support],
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[ompi_cv_c_weak_symbols],
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[_OMPI_C_WEAK_SYMBOLS([ompi_cv_c_weak_symbols="yes"],
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[ompi_cv_c_weak_symbols="no"])])
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AS_IF([test "$ompi_cv_c_weak_symbols" = "yes"],
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[OPAL_C_HAVE_WEAK_SYMBOLS=1], [OPAL_C_HAVE_WEAK_SYMBOLS=0])
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]) dnl
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