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Add m4/pc_from_ucontext.m4. It supports NetBSD and OpenBSD as well. 

Also, update the version of acx_pthread.m4


git-svn-id: https://google-glog.googlecode.com/svn/trunk@55 eb4d4688-79bd-11dd-afb4-1d65580434c0
parent 424c6fc5
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Showing with 396 additions and 261 deletions
Makefile.in
View file @ 4cd83814
......@@ -67,6 +67,7 @@ am__aclocal_m4_deps = $(top_srcdir)/m4/ac_have_attribute.m4 \
$(top_srcdir)/m4/ac_rwlock.m4 $(top_srcdir)/m4/acx_pthread.m4 \
$(top_srcdir)/m4/google_namespace.m4 \
$(top_srcdir)/m4/namespaces.m4 \
$(top_srcdir)/m4/pc_from_ucontext.m4 \
$(top_srcdir)/m4/stl_namespace.m4 \
$(top_srcdir)/m4/using_operator.m4 $(top_srcdir)/configure.ac
am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
......
aclocal.m4
View file @ 4cd83814
......@@ -7537,5 +7537,6 @@ m4_include([m4/ac_rwlock.m4])
m4_include([m4/acx_pthread.m4])
m4_include([m4/google_namespace.m4])
m4_include([m4/namespaces.m4])
m4_include([m4/pc_from_ucontext.m4])
m4_include([m4/stl_namespace.m4])
m4_include([m4/using_operator.m4])
configure
View file @ 4cd83814
......@@ -23526,50 +23526,97 @@ test -n "$PTHREAD_CC" || PTHREAD_CC="${CC}"
PTHREAD_CC=$CC
fi
# The next part tries to detect GCC inconsistency with -shared on some
# architectures and systems. The problem is that in certain
# configurations, when -shared is specified, GCC "forgets" to
# internally use various flags which are still necessary.
# The next part tries to detect GCC inconsistency with -shared on some
# architectures and systems. The problem is that in certain
# configurations, when -shared is specified, GCC "forgets" to
# internally use various flags which are still necessary.
{ echo "$as_me:$LINENO: checking whether to check for GCC pthread/shared inconsistencies" >&5
#
# Prepare the flags
#
save_CFLAGS="$CFLAGS"
save_LIBS="$LIBS"
save_CC="$CC"
# Try with the flags determined by the earlier checks.
#
# -Wl,-z,defs forces link-time symbol resolution, so that the
# linking checks with -shared actually have any value
#
# FIXME: -fPIC is required for -shared on many architectures,
# so we specify it here, but the right way would probably be to
# properly detect whether it is actually required.
CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
LIBS="$PTHREAD_LIBS $LIBS"
CC="$PTHREAD_CC"
# In order not to create several levels of indentation, we test
# the value of "$done" until we find the cure or run out of ideas.
done="no"
# First, make sure the CFLAGS we added are actually accepted by our
# compiler. If not (and OS X's ld, for instance, does not accept -z),
# then we can't do this test.
if test x"$done" = xno; then
{ echo "$as_me:$LINENO: checking whether to check for GCC pthread/shared inconsistencies" >&5
echo $ECHO_N "checking whether to check for GCC pthread/shared inconsistencies... $ECHO_C" >&6; }
check_inconsistencies=yes
case "${host_cpu}-${host_os}" in
*-darwin*) check_inconsistencies=no ;;
esac
if test x"$GCC" != xyes -o "x$check_inconsistencies" != xyes ; then
{ echo "$as_me:$LINENO: result: no" >&5
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
(eval "$ac_link") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext &&
$as_test_x conftest$ac_exeext; then
:
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
done=yes
fi
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
if test "x$done" = xyes ; then
{ echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6; }
else
{ echo "$as_me:$LINENO: result: yes" >&5
else
{ echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6; }
fi
fi
# In order not to create several levels of indentation, we test
# the value of "$ok" until we find out the cure or run out of
# ideas.
ok="no"
#
# Prepare the flags
#
save_CFLAGS="$CFLAGS"
save_LIBS="$LIBS"
save_CC="$CC"
# Try with the flags determined by the earlier checks.
#
# -Wl,-z,defs forces link-time symbol resolution, so that the
# linking checks with -shared actually have any value
#
# FIXME: -fPIC is required for -shared on many architectures,
# so we specify it here, but the right way would probably be to
# properly detect whether it is actually required.
CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
LIBS="$PTHREAD_LIBS $LIBS"
CC="$PTHREAD_CC"
{ echo "$as_me:$LINENO: checking whether -pthread is sufficient with -shared" >&5
if test x"$done" = xno; then
{ echo "$as_me:$LINENO: checking whether -pthread is sufficient with -shared" >&5
echo $ECHO_N "checking whether -pthread is sufficient with -shared... $ECHO_C" >&6; }
cat >conftest.$ac_ext <<_ACEOF
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
......@@ -23580,8 +23627,8 @@ int
main ()
{
pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0);
;
return 0;
}
......@@ -23604,7 +23651,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
test ! -s conftest.err
} && test -s conftest$ac_exeext &&
$as_test_x conftest$ac_exeext; then
ok=yes
done=yes
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
......@@ -23615,23 +23662,24 @@ fi
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
if test "x$ok" = xyes; then
{ echo "$as_me:$LINENO: result: yes" >&5
if test "x$done" = xyes; then
{ echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6; }
else
{ echo "$as_me:$LINENO: result: no" >&5
else
{ echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6; }
fi
fi
fi
#
# Linux gcc on some architectures such as mips/mipsel forgets
# about -lpthread
#
if test x"$ok" = xno; then
{ echo "$as_me:$LINENO: checking whether -lpthread fixes that" >&5
#
# Linux gcc on some architectures such as mips/mipsel forgets
# about -lpthread
#
if test x"$done" = xno; then
{ echo "$as_me:$LINENO: checking whether -lpthread fixes that" >&5
echo $ECHO_N "checking whether -lpthread fixes that... $ECHO_C" >&6; }
LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
cat >conftest.$ac_ext <<_ACEOF
LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
......@@ -23642,8 +23690,8 @@ int
main ()
{
pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0);
;
return 0;
}
......@@ -23666,7 +23714,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
test ! -s conftest.err
} && test -s conftest$ac_exeext &&
$as_test_x conftest$ac_exeext; then
ok=yes
done=yes
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
......@@ -23677,23 +23725,23 @@ fi
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
if test "x$ok" = xyes; then
{ echo "$as_me:$LINENO: result: yes" >&5
if test "x$done" = xyes; then
{ echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6; }
PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
else
{ echo "$as_me:$LINENO: result: no" >&5
PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
else
{ echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6; }
fi
fi
#
# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
#
if test x"$ok" = xno; then
{ echo "$as_me:$LINENO: checking whether -lc_r fixes that" >&5
fi
fi
#
# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
#
if test x"$done" = xno; then
{ echo "$as_me:$LINENO: checking whether -lc_r fixes that" >&5
echo $ECHO_N "checking whether -lc_r fixes that... $ECHO_C" >&6; }
LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
cat >conftest.$ac_ext <<_ACEOF
LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
......@@ -23704,8 +23752,8 @@ int
main ()
{
pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0);
;
return 0;
}
......@@ -23728,7 +23776,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
test ! -s conftest.err
} && test -s conftest$ac_exeext &&
$as_test_x conftest$ac_exeext; then
ok=yes
done=yes
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
......@@ -23739,28 +23787,27 @@ fi
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
if test "x$ok" = xyes; then
{ echo "$as_me:$LINENO: result: yes" >&5
if test "x$done" = xyes; then
{ echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6; }
PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
else
{ echo "$as_me:$LINENO: result: no" >&5
PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
else
{ echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6; }
fi
fi
if test x"$ok" = xno; then
# OK, we have run out of ideas
{ echo "$as_me:$LINENO: WARNING: Impossible to determine how to use pthreads with shared libraries" >&5
fi
fi
if test x"$done" = xno; then
# OK, we have run out of ideas
{ echo "$as_me:$LINENO: WARNING: Impossible to determine how to use pthreads with shared libraries" >&5
echo "$as_me: WARNING: Impossible to determine how to use pthreads with shared libraries" >&2;}
# so it's not safe to assume that we may use pthreads
acx_pthread_ok=no
fi
# so it's not safe to assume that we may use pthreads
acx_pthread_ok=no
fi
CFLAGS="$save_CFLAGS"
LIBS="$save_LIBS"
CC="$save_CC"
fi
CFLAGS="$save_CFLAGS"
LIBS="$save_LIBS"
CC="$save_CC"
else
PTHREAD_CC="$CC"
fi
......@@ -24527,38 +24574,36 @@ _ACEOF
fi
# We want to access the "PC" (Program Counter) register from a struct
# ucontext. Every system has its own way of doing that. We try all the
# possibilities we know about. Note REG_PC should come first (REG_RIP
# is also defined on solaris, but does the wrong thing).
{ echo "$as_me:$LINENO: checking how to access the program counter from a struct ucontext" >&5
echo $ECHO_N "checking how to access the program counter from a struct ucontext... $ECHO_C" >&6; }
pc_fields=" uc_mcontext.gregs[REG_PC]" # Solaris x86 (32 + 64 bit)
pc_fields="$pc_fields uc_mcontext.gregs[REG_EIP]" # Linux (i386)
pc_fields="$pc_fields uc_mcontext.gregs[REG_RIP]" # Linux (x86_64)
pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[PT_NIP]" # Linux (ppc)
pc_fields="$pc_fields uc_mcontext.gregs[R15]" # Linux (arm old [untested])
pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm new [untested])
pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
pc_field_found=false
for pc_field in $pc_fields; do
if ! $pc_field_found; then
cat >conftest.$ac_ext <<_ACEOF
pc_fields=" uc_mcontext.gregs[REG_PC]" # Solaris x86 (32 + 64 bit)
pc_fields="$pc_fields uc_mcontext.gregs[REG_EIP]" # Linux (i386)
pc_fields="$pc_fields uc_mcontext.gregs[REG_RIP]" # Linux (x86_64)
pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[PT_NIP]" # Linux (ppc)
pc_fields="$pc_fields uc_mcontext.gregs[R15]" # Linux (arm old [untested])
pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm new [untested])
pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
pc_fields="$pc_fields uc_mcontext.__gregs[_REG_EIP]" # NetBSD (i386)
pc_fields="$pc_fields uc_mcontext.__gregs[_REG_RIP]" # NetBSD (x86_64)
pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
pc_field_found=false
for pc_field in $pc_fields; do
if ! $pc_field_found; then
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#define _GNU_SOURCE 1
#include <ucontext.h>
#include <ucontext.h>
int
main ()
{
......@@ -24589,9 +24634,9 @@ cat >>confdefs.h <<_ACEOF
#define PC_FROM_UCONTEXT $pc_field
_ACEOF
{ echo "$as_me:$LINENO: result: $pc_field" >&5
{ echo "$as_me:$LINENO: result: $pc_field" >&5
echo "${ECHO_T}$pc_field" >&6; }
pc_field_found=true
pc_field_found=true
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
......@@ -24600,13 +24645,69 @@ sed 's/^/| /' conftest.$ac_ext >&5
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
done
if ! $pc_field_found; then
{ echo "$as_me:$LINENO: WARNING: Could not find the PC. Will not output failed addresses..." >&5
echo "$as_me: WARNING: Could not find the PC. Will not output failed addresses..." >&2;}
fi
done
if ! $pc_field_found; then
pc_fields=" sc_eip" # OpenBSD (i386)
pc_fields="$pc_fields sc_rip" # OpenBSD (x86_64)
for pc_field in $pc_fields; do
if ! $pc_field_found; then
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include <signal.h>
int
main ()
{
ucontext_t u; return u.$pc_field == 0;
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
(eval "$ac_compile") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest.$ac_objext; then
cat >>confdefs.h <<_ACEOF
#define PC_FROM_UCONTEXT $pc_field
_ACEOF
{ echo "$as_me:$LINENO: result: $pc_field" >&5
echo "${ECHO_T}$pc_field" >&6; }
pc_field_found=true
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
done
fi
if ! $pc_field_found; then
{ echo "$as_me:$LINENO: WARNING: Could not find the PC. Will not output failed addresses..." >&5
echo "$as_me: WARNING: Could not find the PC. Will not output failed addresses..." >&2;}
fi
# These are what's needed by logging.h.in and raw_logging.h.in
......
configure.ac
View file @ 4cd83814
......@@ -172,41 +172,7 @@ AC_DEFINE_GOOGLE_NAMESPACE(google)
AC_CXX_USING_OPERATOR
# We want to access the "PC" (Program Counter) register from a struct
# ucontext. Every system has its own way of doing that. We try all the
# possibilities we know about. Note REG_PC should come first (REG_RIP
# is also defined on solaris, but does the wrong thing).
AC_MSG_CHECKING([how to access the program counter from a struct ucontext])
pc_fields=" uc_mcontext.gregs[[REG_PC]]" # Solaris x86 (32 + 64 bit)
pc_fields="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386)
pc_fields="$pc_fields uc_mcontext.gregs[[REG_RIP]]" # Linux (x86_64)
pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[[PT_NIP]]" # Linux (ppc)
pc_fields="$pc_fields uc_mcontext.gregs[[R15]]" # Linux (arm old [untested])
pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm new [untested])
pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
pc_field_found=false
for pc_field in $pc_fields; do
if ! $pc_field_found; then
AC_TRY_COMPILE([#define _GNU_SOURCE 1
#include <ucontext.h>],
[ucontext_t u; return u.$pc_field == 0;],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
fi
done
if ! $pc_field_found; then
AC_MSG_WARN(Could not find the PC. Will not output failed addresses...)
fi
AC_PC_FROM_UCONTEXT(AC_MSG_WARN(Could not find the PC. Will not output failed addresses...))
# These are what's needed by logging.h.in and raw_logging.h.in
AC_SUBST(ac_google_start_namespace)
......
m4/acx_pthread.m4
View file @ 4cd83814
# This was retrieved from
# http://0pointer.de/cgi-bin/viewcvs.cgi/trunk/common/acx_pthread.m4?rev=1227
# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&root=avahi
# See also (perhaps for new versions?)
# http://0pointer.de/cgi-bin/viewcvs.cgi/trunk/common/acx_pthread.m4
# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?root=avahi
#
# We've rewritten the inconsistency check code (from avahi), to work
# more broadly. In particular, it no longer assumes ld accepts -zdefs.
# This caused a restructing of the code, but the functionality has only
# changed a little.
dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
dnl
......@@ -231,108 +236,113 @@ if test "x$acx_pthread_ok" = xyes; then
PTHREAD_CC=$CC
fi
# The next part tries to detect GCC inconsistency with -shared on some
# architectures and systems. The problem is that in certain
# configurations, when -shared is specified, GCC "forgets" to
# internally use various flags which are still necessary.
AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
check_inconsistencies=yes
case "${host_cpu}-${host_os}" in
*-darwin*) check_inconsistencies=no ;;
esac
if test x"$GCC" != xyes -o "x$check_inconsistencies" != xyes ; then
AC_MSG_RESULT([no])
else
AC_MSG_RESULT([yes])
# In order not to create several levels of indentation, we test
# the value of "$ok" until we find out the cure or run out of
# ideas.
ok="no"
#
# Prepare the flags
#
save_CFLAGS="$CFLAGS"
save_LIBS="$LIBS"
save_CC="$CC"
# Try with the flags determined by the earlier checks.
#
# -Wl,-z,defs forces link-time symbol resolution, so that the
# linking checks with -shared actually have any value
#
# FIXME: -fPIC is required for -shared on many architectures,
# so we specify it here, but the right way would probably be to
# properly detect whether it is actually required.
CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
LIBS="$PTHREAD_LIBS $LIBS"
CC="$PTHREAD_CC"
AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[ok=yes])
if test "x$ok" = xyes; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
#
# Linux gcc on some architectures such as mips/mipsel forgets
# about -lpthread
#
if test x"$ok" = xno; then
AC_MSG_CHECKING([whether -lpthread fixes that])
LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[ok=yes])
if test "x$ok" = xyes; then
AC_MSG_RESULT([yes])
PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
else
AC_MSG_RESULT([no])
fi
fi
#
# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
#
if test x"$ok" = xno; then
AC_MSG_CHECKING([whether -lc_r fixes that])
LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[ok=yes])
if test "x$ok" = xyes; then
AC_MSG_RESULT([yes])
PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
else
AC_MSG_RESULT([no])
fi
fi
if test x"$ok" = xno; then
# OK, we have run out of ideas
AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
# so it's not safe to assume that we may use pthreads
acx_pthread_ok=no
fi
CFLAGS="$save_CFLAGS"
LIBS="$save_LIBS"
CC="$save_CC"
fi
# The next part tries to detect GCC inconsistency with -shared on some
# architectures and systems. The problem is that in certain
# configurations, when -shared is specified, GCC "forgets" to
# internally use various flags which are still necessary.
#
# Prepare the flags
#
save_CFLAGS="$CFLAGS"
save_LIBS="$LIBS"
save_CC="$CC"
# Try with the flags determined by the earlier checks.
#
# -Wl,-z,defs forces link-time symbol resolution, so that the
# linking checks with -shared actually have any value
#
# FIXME: -fPIC is required for -shared on many architectures,
# so we specify it here, but the right way would probably be to
# properly detect whether it is actually required.
CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
LIBS="$PTHREAD_LIBS $LIBS"
CC="$PTHREAD_CC"
# In order not to create several levels of indentation, we test
# the value of "$done" until we find the cure or run out of ideas.
done="no"
# First, make sure the CFLAGS we added are actually accepted by our
# compiler. If not (and OS X's ld, for instance, does not accept -z),
# then we can't do this test.
if test x"$done" = xno; then
AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
AC_TRY_LINK(,, , [done=yes])
if test "x$done" = xyes ; then
AC_MSG_RESULT([no])
else
AC_MSG_RESULT([yes])
fi
fi
if test x"$done" = xno; then
AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[done=yes])
if test "x$done" = xyes; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
fi
#
# Linux gcc on some architectures such as mips/mipsel forgets
# about -lpthread
#
if test x"$done" = xno; then
AC_MSG_CHECKING([whether -lpthread fixes that])
LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[done=yes])
if test "x$done" = xyes; then
AC_MSG_RESULT([yes])
PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
else
AC_MSG_RESULT([no])
fi
fi
#
# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
#
if test x"$done" = xno; then
AC_MSG_CHECKING([whether -lc_r fixes that])
LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[done=yes])
if test "x$done" = xyes; then
AC_MSG_RESULT([yes])
PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
else
AC_MSG_RESULT([no])
fi
fi
if test x"$done" = xno; then
# OK, we have run out of ideas
AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
# so it's not safe to assume that we may use pthreads
acx_pthread_ok=no
fi
CFLAGS="$save_CFLAGS"
LIBS="$save_LIBS"
CC="$save_CC"
else
PTHREAD_CC="$CC"
fi
......
m4/pc_from_ucontext.m4 0 → 100644
View file @ 4cd83814
# We want to access the "PC" (Program Counter) register from a struct
# ucontext. Every system has its own way of doing that. We try all the
# possibilities we know about. Note REG_PC should come first (REG_RIP
# is also defined on solaris, but does the wrong thing).
# OpenBSD doesn't have ucontext.h, but we can get PC from ucontext_t
# by using signal.h.
AC_DEFUN([AC_PC_FROM_UCONTEXT],
[AC_MSG_CHECKING([how to access the program counter from a struct ucontext])
pc_fields=" uc_mcontext.gregs[[REG_PC]]" # Solaris x86 (32 + 64 bit)
pc_fields="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386)
pc_fields="$pc_fields uc_mcontext.gregs[[REG_RIP]]" # Linux (x86_64)
pc_fields="$pc_fields uc_mcontext.sc_ip" # Linux (ia64)
pc_fields="$pc_fields uc_mcontext.uc_regs->gregs[[PT_NIP]]" # Linux (ppc)
pc_fields="$pc_fields uc_mcontext.gregs[[R15]]" # Linux (arm old [untested])
pc_fields="$pc_fields uc_mcontext.arm_pc" # Linux (arm new [untested])
pc_fields="$pc_fields uc_mcontext.mc_eip" # FreeBSD (i386)
pc_fields="$pc_fields uc_mcontext.mc_rip" # FreeBSD (x86_64 [untested])
pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_EIP]]" # NetBSD (i386)
pc_fields="$pc_fields uc_mcontext.__gregs[[_REG_RIP]]" # NetBSD (x86_64)
pc_fields="$pc_fields uc_mcontext->ss.eip" # OS X (i386, <=10.4)
pc_fields="$pc_fields uc_mcontext->__ss.__eip" # OS X (i386, >=10.5)
pc_fields="$pc_fields uc_mcontext->ss.rip" # OS X (x86_64)
pc_fields="$pc_fields uc_mcontext->__ss.__rip" # OS X (>=10.5 [untested])
pc_fields="$pc_fields uc_mcontext->ss.srr0" # OS X (ppc, ppc64 [untested])
pc_fields="$pc_fields uc_mcontext->__ss.__srr0" # OS X (>=10.5 [untested])
pc_field_found=false
for pc_field in $pc_fields; do
if ! $pc_field_found; then
AC_TRY_COMPILE([#define _GNU_SOURCE 1
#include <ucontext.h>],
[ucontext_t u; return u.$pc_field == 0;],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
fi
done
if ! $pc_field_found; then
pc_fields=" sc_eip" # OpenBSD (i386)
pc_fields="$pc_fields sc_rip" # OpenBSD (x86_64)
for pc_field in $pc_fields; do
if ! $pc_field_found; then
AC_TRY_COMPILE([#include <signal.h>],
[ucontext_t u; return u.$pc_field == 0;],
AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field,
How to access the PC from a struct ucontext)
AC_MSG_RESULT([$pc_field])
pc_field_found=true)
fi
done
fi
if ! $pc_field_found; then
AC_MSG_WARN(Could not find the PC. Will not output failed addresses...)
fi])
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