Proof of concept: disable PIE when linking vacall tests

[Josh Elsasser]

Some platforms, such as OpenBSD (and some Linux distributions?), build
PIC executables by default. The vacall tests fail at least on OpenBSD
x86-64 and powerpc unless PIE is disabled.

The following patch works for me, but I assume will break any platform
where the compiler doesn't understand the -nopie flag. Perhaps there
is an existing autoconf recipe for detecting how to disable PIE?

diff --git vacall/Makefile.in vacall/Makefile.in
index bd6d4bd..ee70cd3 100644
--- vacall/Makefile.in
+++ vacall/Makefile.in
@@ -280,13 +280,13 @@ minitests.s : $(srcdir)/minitests.c $(srcdir)/tests.c 
$(srcdir)/vacall.h
        $(CC) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) -S $(srcdir)/minitests.c
 
 minitests : minitests.@OBJEXT@ libvacall.a
-       $(CC) $(CFLAGS) @GCC_X_NONE@ minitests.@OBJEXT@ libvacall.a $(LDFLAGS) 
-o minitests
+       $(CC) $(CFLAGS) -nopie @GCC_X_NONE@ minitests.@OBJEXT@ libvacall.a 
$(LDFLAGS) -o minitests
 
 minitests-c++.@OBJEXT@ : $(srcdir)/minitests-c++.cc $(srcdir)/minitests.c 
$(srcdir)/tests.c $(srcdir)/vacall.h
        $(CXX) $(INCLUDES) $(CPPFLAGS) $(CXXFLAGS) -c $(srcdir)/minitests-c++.cc
 
 minitests-c++ : minitests-c++.@OBJEXT@ libvacall.a
-       $(CXX) $(CXXFLAGS) @GCC_X_NONE@ minitests-c++.@OBJEXT@ libvacall.a 
$(LDFLAGS) -o minitests-c++
+       $(CXX) $(CXXFLAGS) -nopie @GCC_X_NONE@ minitests-c++.@OBJEXT@ 
libvacall.a $(LDFLAGS) -o minitests-c++
 
 check : all minitests
        ./minitests > minitests.out
@@ -304,7 +304,7 @@ tests.s : $(srcdir)/tests.c $(srcdir)/vacall.h
        $(CC) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) -S $(srcdir)/tests.c
 
 tests : tests.@OBJEXT@ libvacall.a
-       $(CC) $(CFLAGS) @GCC_X_NONE@ tests.@OBJEXT@ libvacall.a $(LDFLAGS) -o 
tests
+       $(CC) $(CFLAGS) -nopie @GCC_X_NONE@ tests.@OBJEXT@ libvacall.a 
$(LDFLAGS) -o tests
 
 extracheck : all tests
        ./tests > tests.out