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tests: skip C++ tests if we can't compile a simple program

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There are possible conflicts between gnulib replacement functions (in
<stdio.h>) and their C++ wrappers (in <stream>).  Trying to address
these in configure seems too hard, and I don't know how to fix the issue
in gnulib.  Cowardly avoid the problem by skipping C++ tests when this
happens.
Reported by Stefano Lattarini.
http://lists.gnu.org/archive/html/bug-bison/2013-06/msg00001.html

* tests/atlocal.in (BISON_CXX_WORKS): Also set it to "skip" if we can't
compile a simple program using <stream>.
* tests/local.at: Comment changes.
This commit is contained in:
Akim Demaille
2013-07-03 17:16:04 +02:00
parent ac953ff80a
commit b7171c45f4
2 changed files with 35 additions and 3 deletions
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31
tests/atlocal.in
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@@ -50,6 +50,37 @@ CXXFLAGS="$NO_WERROR_CXXFLAGS @WERROR_CXXFLAGS@"
# If 'exit 77'; skip all C++ tests; otherwise ':'.
BISON_CXX_WORKS='@BISON_CXX_WORKS@'
# Be sure that the C++ compiler is not broken because of gnulib. This
# cannot be checked in configure (gnulib is not parameterized yet),
# and checking this in every C++ test in AC_COMPILE_CXX is too costly.
#
# http://lists.gnu.org/archive/html/bug-bison/2013-06/msg00001.html
#
# FIXME: Check (say 2014) whether this is still needed.
if $BISON_CXX_WORKS; then
# See AT_DATA_SOURCE_PROLOGUE.
cat >conftest.cc <<EOF
#include <config.h>
/* We don't need perfect functions for these tests. */
#undef malloc
#undef memcmp
#undef realloc
#include <iostream>
int main ()
{
std::cout << "Works" << std::endl;
}
EOF
ls
$CXX $CXXFLAGS $CPPFLAGS $LDFLAGS $LIBS -o conftest conftest.cc
case $? in
0);;
*) BISON_CXX_WORKS="as_fn_error 77 cannot-compile-simple-program";;
esac
rm -f conftest*
fi
# Whether the compiler supports POSIXLY_CORRECT defined.
: ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
: ${CXX_COMPILER_POSIXLY_CORRECT='@CXX_COMPILER_POSIXLY_CORRECT@'}

7
tests/local.at
View File

@@ -339,9 +339,9 @@ m4_define([AT_LANG_DISPATCH],
# AT_DATA_SOURCE_PROLOGUE
# ------------------------
# -----------------------
# The prologue that should be included in any source code that is
# meant to be compiled.
# meant to be compiled. Keep atlocal.in sync (BISON_CXX_WORKS).
m4_define([AT_DATA_SOURCE_PROLOGUE],
[[#include <config.h>
/* We don't need perfect functions for these tests. */
@@ -754,6 +754,7 @@ AT_CHECK(m4_join([ ],
[m4_bmatch([$1], [[.]], [], [$LIBS])]),
0, [ignore], [ignore])])
# AT_COMPILE_CXX(OUTPUT, [SOURCES = OUTPUT.cc])
# ---------------------------------------------
# Compile SOURCES into OUTPUT. If the C++ compiler does not work,
@@ -761,7 +762,7 @@ AT_CHECK(m4_join([ ],
#
# If OUTPUT does not contain '.', assume that we are linking too,
# otherwise pass "-c"; this is a hack. The default SOURCES is OUTPUT
# with trailing .o removed, and ".cc" appended.
# with trailing ".o" removed, and ".cc" appended.
m4_define([AT_COMPILE_CXX],
[AT_KEYWORDS(c++)
AT_CHECK([$BISON_CXX_WORKS], 0, ignore, ignore)