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c++tools, configury: Configure with C++; test checking status [PR98821].

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The c++tools configure fragments need to be built with a C++ compiler.

In addition, the stand-alone server uses diagnostic mechanisms in common
with GCC, but needs to define implementations for gcc_assert and
supporting output functions.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

PR c++/98821 - modules : c++tools configures with CC but code fragments assume CXX.

	PR c++/98821

c++tools/ChangeLog:

	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Configure using C++.  Pull logic to
	detect enabled checking modes; default to release
	checking.
	* server.cc (AI_NUMERICSERV): Define a fallback value.
	(gcc_assert): New.
	(gcc_unreachable): New.
	(fancy_abort): Only build when checking is enabled.

Co-authored-by: Jakub Jelinek <jakub@redhat.com>
This commit is contained in:
Iain Sandoe 2021-07-20 14:00:38 +01:00
parent f8884b9c51
commit e4d306cf70
4 changed files with 177 additions and 660 deletions
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3
c++tools/config.h.in
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@ -1,5 +1,8 @@
/* config.h.in. Generated from configure.ac by autoheader. */
/* Define if you want assertions enabled. This is a cheap check. */
#undef ENABLE_ASSERT_CHECKING
/* Define if accept4 provided. */
#undef HAVE_ACCEPT4

775
c++tools/configure vendored
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File diff suppressed because it is too large Load Diff

31
c++tools/configure.ac
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@ -41,6 +41,8 @@ MISSING=`cd $ac_aux_dir && ${PWDCMD-pwd}`/missing
AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
AC_LANG(C++)
dnl Enabled by default
AC_MSG_CHECKING([whether to build C++ tools])
AC_ARG_ENABLE(c++-tools,
@ -67,6 +69,35 @@ AC_MSG_RESULT([$maintainer_mode])
test "$maintainer_mode" = yes && MAINTAINER=yes
AC_SUBST(MAINTAINER)
# Handle configuration of checking; for the tools in this directory we
# default to release checking and stricter checks do not change this.
AC_ARG_ENABLE(checking,
[AS_HELP_STRING([[--enable-checking[=LIST]]],
[enable expensive run-time checks. With LIST,
enable only specific categories of checks.
Categories are: yes,no,all,none,release.])],
[ac_checking_flags="${enableval}"],[
# Default to checking.
ac_checking_flags=yes
])
IFS="${IFS= }"; ac_save_IFS="$IFS"; IFS="$IFS,"
for check in release $ac_checking_flags
do
case $check in
# these set all the flags to specific states
yes|all|release|assert) ac_assert_checking=1 ; ;;
no|none) ac_assert_checking= ; ;;
*) ;;
esac
done
IFS="$ac_save_IFS"
if test x$ac_assert_checking != x ; then
AC_DEFINE(ENABLE_ASSERT_CHECKING, 1,
[Define if you want assertions enabled. This is a cheap check.])
fi
# Check whether --enable-default-pie was given.
AC_ARG_ENABLE(default-pie,
[AS_HELP_STRING([--enable-default-pie],

28
c++tools/server.cc
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@ -61,6 +61,10 @@ along with GCC; see the file COPYING3. If not see
# define gai_strerror(X) ""
#endif
#ifndef AI_NUMERICSERV
#define AI_NUMERICSERV 0
#endif
#include <getopt.h>
// Select or epoll
@ -92,6 +96,28 @@ along with GCC; see the file COPYING3. If not see
#define DIR_SEPARATOR '/'
#endif
/* Imported from libcpp/system.h
Use gcc_assert(EXPR) to test invariants. */
#if ENABLE_ASSERT_CHECKING
#define gcc_assert(EXPR) \
((void)(!(EXPR) ? fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0 : 0))
#elif (GCC_VERSION >= 4005)
#define gcc_assert(EXPR) \
((void)(__builtin_expect (!(EXPR), 0) ? __builtin_unreachable (), 0 : 0))
#else
/* Include EXPR, so that unused variable warnings do not occur. */
#define gcc_assert(EXPR) ((void)(0 && (EXPR)))
#endif
/* Use gcc_unreachable() to mark unreachable locations (like an
unreachable default case of a switch. Do not use gcc_assert(0). */
#if (GCC_VERSION >= 4005) && !ENABLE_ASSERT_CHECKING
#define gcc_unreachable() __builtin_unreachable ()
#else
#define gcc_unreachable() (fancy_abort (__FILE__, __LINE__, __FUNCTION__))
#endif
#if NETWORKING
struct netmask {
in6_addr addr;
@ -202,11 +228,13 @@ internal_error (const char *fmt, ...)
/* Hooked to from gcc_assert & gcc_unreachable. */
#if ENABLE_ASSERT_CHECKING
void ATTRIBUTE_NORETURN ATTRIBUTE_COLD
fancy_abort (const char *file, int line, const char *func)
{
internal_error ("in %s, at %s:%d", func, trim_src_file (file), line);
}
#endif
/* Exploded on a signal. */