## Process this file with autoconf to produce configure. ## In general, the safest way to proceed is to run ./autogen.sh # make sure we're interpreted by some minimal autoconf AC_PREREQ([2.59]) AC_INIT([gperftools],[2.4],[google-perftools@googlegroups.com]) # Update this value for every release! (A:B:C will map to foo.so.(A-C).C.B) # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html TCMALLOC_SO_VERSION=6:6:2 PROFILER_SO_VERSION=4:5:4 AC_SUBST(TCMALLOC_SO_VERSION) AC_SUBST(PROFILER_SO_VERSION) # The argument here is just something that should be in the current directory # (for sanity checking) AC_CONFIG_SRCDIR(README) AC_CONFIG_MACRO_DIR([m4]) AC_CANONICAL_HOST AM_INIT_AUTOMAKE([dist-zip]) AC_CONFIG_HEADERS([src/config.h]) AM_MAINTAINER_MODE() # Export the version information (for tc_version and friends) TC_VERSION_MAJOR=`expr "$PACKAGE_VERSION" : '\([[0-9]]*\)'` TC_VERSION_MINOR=`expr "$PACKAGE_VERSION" : '[[0-9]]*\.\([[0-9]]*\)'` TC_VERSION_PATCH=`expr "$PACKAGE_VERSION" : '[[0-9]]*\.[[0-9]]*\(.*\)$'` AC_SUBST(TC_VERSION_MAJOR) AC_SUBST(TC_VERSION_MINOR) AC_SUBST(TC_VERSION_PATCH) AC_SUBST(PACKAGE_STRING) # The user can choose not to compile in the heap-profiler, the # heap-checker, or the cpu-profiler. There's also the possibility # for a 'fully minimal' compile, which leaves out the stacktrace # code as well. By default, we include all of these that the # target system supports. default_enable_cpu_profiler=yes default_enable_heap_profiler=yes default_enable_heap_checker=yes default_enable_debugalloc=yes default_enable_minimal=no default_tcmalloc_alignment=16 need_nanosleep=yes # Used later, to decide if to run ACX_NANOSLEEP case "$host" in *-mingw*) default_enable_minimal=yes; default_enable_debugalloc=no; need_nanosleep=no;; *-cygwin*) default_enable_heap_checker=no; default_enable_cpu_profiler=no;; *-freebsd*) default_enable_heap_checker=no;; *-darwin*) default_enable_heap_checker=no;; esac # Currently only backtrace works on s390x. AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [return __s390x__])], [default_enable_libunwind=no default_enable_backtrace=yes], [default_enable_libunwind=yes default_enable_backtrace=no]) # Disable libunwind linking on ppc64 by default. AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [return __PPC64__])], [default_enable_libunwind=no default_tcmalloc_pagesize=64], [default_enable_libunwind=yes default_tcmalloc_pagesize=8]) AC_ARG_ENABLE([cpu-profiler], [AS_HELP_STRING([--disable-cpu-profiler], [do not build the cpu profiler])], [], [enable_cpu_profiler="$default_enable_cpu_profiler"]) AC_ARG_ENABLE([heap-profiler], [AS_HELP_STRING([--disable-heap-profiler], [do not build the heap profiler])], [], [enable_heap_profiler="$default_enable_heap_profiler"]) AC_ARG_ENABLE([heap-checker], [AS_HELP_STRING([--disable-heap-checker], [do not build the heap checker])], [], [enable_heap_checker="$default_enable_heap_checker"]) AC_ARG_ENABLE([debugalloc], [AS_HELP_STRING([--disable-debugalloc], [do not build versions of libs with debugalloc])], [], [enable_debugalloc="$default_enable_debugalloc"]) AC_ARG_ENABLE([minimal], [AS_HELP_STRING([--enable-minimal], [build only tcmalloc-minimal (and maybe tcmalloc-minimal-debug)])], [], [enable_minimal="$default_enable_minimal"]) if test "$enable_minimal" = yes; then enable_cpu_profiler=no enable_heap_profiler=no enable_heap_checker=no fi AC_ARG_ENABLE([stacktrace-via-backtrace], [AS_HELP_STRING([--enable-stacktrace-via-backtrace], [enable use of backtrace() for stacktrace capturing (may deadlock)])], [enable_backtrace=yes], [enable_backtrace="$default_enable_backtrace"]) AC_ARG_ENABLE([libunwind], [AS_HELP_STRING([--enable-libunwind], [enable libunwind linking])], [], [enable_libunwind="$default_enable_libunwind"]) AC_ARG_WITH([tcmalloc-pagesize], [AS_HELP_STRING([--with-tcmalloc-pagesize], [Set the tcmalloc internal page size to 8K, 32K or 64K])], [], [with_tcmalloc_pagesize=$default_tcmalloc_pagesize]) AC_ARG_WITH([tcmalloc-alignment], [AS_HELP_STRING([--with-tcmalloc-alignment], [Set the tcmalloc allocation alignment to 8 or 16 bytes])], [], [with_tcmalloc_alignment=$default_tcmalloc_alignment]) case "$with_tcmalloc_pagesize" in 8) #Default tcmalloc page size. ;; 32) AC_DEFINE(TCMALLOC_32K_PAGES, 1, [Define 32K of internal pages size for tcmalloc]);; 64) AC_DEFINE(TCMALLOC_64K_PAGES, 1, [Define 64K of internal pages size for tcmalloc]);; *) AC_MSG_WARN([${with_tcmalloc_pagesize}K size not supported, using default tcmalloc page size.]) esac case "$with_tcmalloc_alignment" in 8) AC_DEFINE(TCMALLOC_ALIGN_8BYTES, 1, [Define 8 bytes of allocation alignment for tcmalloc]);; 16) #Default tcmalloc allocation alignment. ;; *) AC_MSG_WARN([${with_tcmalloc_alignment} bytes not supported, using default tcmalloc allocation alignment.]) esac # Checks for programs. AC_PROG_CXX AC_PROG_CC AC_PROG_CPP AM_CONDITIONAL(GCC, test "$GCC" = yes) # let the Makefile know if we're gcc AM_PROG_CC_C_O # shrug: autogen.sh suddenly needs this for some reason # Check if we have an objcopy installed that supports -W AC_CHECK_TOOL([OBJCOPY], [objcopy], []) AS_IF([test -n "$OBJCOPY"], [dnl AC_CACHE_CHECK([if $OBJCOPY supports -W], gpt_cv_objcopy_weaken, [dnl AC_LINK_IFELSE([AC_LANG_PROGRAM([void foo() {} int main() {return 0;}])], [dnl AS_IF(["$OBJCOPY" -W foo conftest$ac_exeext /dev/null], [gpt_cv_objcopy_weaken=yes], [gpt_cv_objcopy_weaken=no])], [gpt_cv_objcopy_weaken=no])])], [gpt_cv_objcopy_weaken=no]) AM_CONDITIONAL(HAVE_OBJCOPY_WEAKEN, test $gpt_cv_objcopy_weaken = yes) AC_PROG_LIBTOOL AC_C_INLINE AX_C___ATTRIBUTE__ # Check whether some low-level functions/files are available AC_HEADER_STDC # TODO(csilvers): we could remove a lot when WITH_CPU_PROFILER etc is "no". AC_CHECK_TYPES([__int64]) # defined in some windows platforms AC_CHECK_TYPES([struct mallinfo],,, [#include ]) AC_CHECK_TYPES([Elf32_Versym],,, [#include ]) # for vdso_support.h AC_CHECK_FUNCS(sbrk) # for tcmalloc to get memory AC_CHECK_FUNCS(geteuid) # for turning off services when run as root AC_CHECK_FUNCS(fork) # for the pthread_atfork setup AC_CHECK_HEADERS(features.h) # for vdso_support.h AC_CHECK_HEADERS(malloc.h) # some systems define stuff there, others not AC_CHECK_HEADERS(sys/malloc.h) # where some versions of OS X put malloc.h AC_CHECK_HEADERS(malloc/malloc.h) # another place OS X puts malloc.h (?) AC_CHECK_HEADERS(glob.h) # for heap-profile-table (cleaning up profiles) AC_CHECK_HEADERS(execinfo.h) # for stacktrace? and heapchecker_unittest AC_CHECK_HEADERS(unwind.h) # for stacktrace AC_CHECK_HEADERS(sched.h) # for being nice in our spinlock code AC_CHECK_HEADERS(conflict-signal.h) # defined on some windows platforms? AC_CHECK_HEADERS(sys/prctl.h) # for thread_lister (needed by leak-checker) AC_CHECK_HEADERS(linux/ptrace.h)# also needed by leak-checker AC_CHECK_HEADERS(sys/syscall.h) AC_CHECK_HEADERS(sys/socket.h) # optional; for forking out to symbolizer AC_CHECK_HEADERS(sys/wait.h) # optional; for forking out to symbolizer AC_CHECK_HEADERS(poll.h) # optional; for forking out to symbolizer AC_CHECK_HEADERS(fcntl.h) # for tcmalloc_unittest AC_CHECK_HEADERS(grp.h) # for heapchecker_unittest AC_CHECK_HEADERS(pwd.h) # for heapchecker_unittest AC_CHECK_HEADERS(sys/resource.h) # for memalign_unittest.cc AC_CHECK_HEADERS(valgrind.h) # we have a local copy if this isn't found AC_CHECK_HEADERS(sys/cdefs.h) # Where glibc defines __THROW AC_CHECK_HEADERS(features.h) # Where __GLIBC__ is defined # We also need /, but we get those from # AC_PC_FROM_UCONTEXT, below. # We override a lot of memory allocation routines, not all of which are # standard. For those the system doesn't declare, we'll declare ourselves. AC_CHECK_DECLS([cfree, posix_memalign, memalign, valloc, pvalloc],,, [#define _XOPEN_SOURCE 600 #include #include ]) if test "$ac_cv_type_struct_mallinfo" = yes; then AC_SUBST(ac_cv_have_struct_mallinfo, 1) # gperftools/tcmalloc.h needs this else AC_SUBST(ac_cv_have_struct_mallinfo, 0) fi # We need to check for mmap. cygwin supports mmap, but the autoconf # test doesn't work on cygwin: # http://www.cygwin.com/ml/cygwin/2002-04/msg00412.html # This workaround comes from # http://cygwin.com/ml/cygwin/2004-11/msg00138.html case "$host" in *-*-mingw*) dnl mingw doesn't have mmap, not worth dnl checking. Especially given that mingw can be a dnl cross-compiler ;; *-*-cygwin*) ac_cv_func_mmap_fixed_mapped=yes AC_DEFINE(HAVE_MMAP, 1, [Define to 1 if you have a working `mmap' system call.]) ;; *) if test "$cross_compiling" = yes; then ac_cv_func_mmap_fixed_mapped=yes AC_DEFINE(HAVE_MMAP, 1, [Define to 1 if you have a working `mmap' system call.]) else AC_FUNC_MMAP fi ;; esac # If AtomicWord != Atomic32, we need to define two versions of all the # atomicops functions. If they're the same, we want to define only one. AC_MSG_CHECKING([if int32_t is the same type as intptr_t]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include ]], [[int32_t v1 = 0; intptr_t v2 = 0; return (&v1 - &v2)]])],[AC_DEFINE(INT32_EQUALS_INTPTR, 1, Define to 1 if int32_t is equivalent to intptr_t) AC_MSG_RESULT([yes])],[AC_MSG_RESULT([no])]) # 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). But don't # bother if we're not doing cpu-profiling. # [*] means that we've not actually tested one of these systems if test "$enable_cpu_profiler" = yes; then AC_PC_FROM_UCONTEXT(AC_MSG_WARN(Could not find the PC. Will not try to compile libprofiler...); enable_cpu_profiler=no) fi # Some tests test the behavior of .so files, and only make sense for dynamic. AM_CONDITIONAL(ENABLE_STATIC, test "$enable_static" = yes) # We want to link in libunwind or libexecinfo if it it is enabled and exists. if test "$enable_libunwind" = yes; then AC_CHECK_HEADERS(libunwind.h) # for stacktrace AC_CHECK_LIB(unwind, backtrace, UNWIND_LIBS=-lunwind, [AC_CHECK_LIB(execinfo, backtrace, UNWIND_LIBS=-lexecinfo, UNWIND_LIBS=)]) AC_SUBST(UNWIND_LIBS) else AC_CHECK_LIB(execinfo, backtrace, UNWIND_LIBS=-lexecinfo, UNWIND_LIBS=) AC_SUBST(UNWIND_LIBS) fi # On x86_64, instead of libunwind, we can choose to compile with frame-pointers. AC_ARG_ENABLE(frame_pointers, AS_HELP_STRING([--enable-frame-pointers], [On x86_64 systems, compile with -fno-omit-frame-pointer (see INSTALL)]), , enable_frame_pointers=no) AM_CONDITIONAL(ENABLE_FRAME_POINTERS, test "$enable_frame_pointers" = yes) AC_MSG_CHECKING([for x86 without frame pointers]) # Some x86_64 systems do not insert frame pointers by default. # We want to see if the current system is one of those. AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [return __x86_64__ == 1 ? 0 : 1])], [is_x86_64=yes], [is_x86_64=no]) OLD_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -S -O2 -o fp.s" # This test will always fail because we don't name our output file properly. # We do our own determination of success/failure in the grep, below. AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int f(int x) {return x;}], [return f(0);])], [:], [:]) x86_no_fp_by_default=no AS_IF([test "$is_x86_64" = yes && ! grep 'mov.*rsp.*rbp' fp.s >/dev/null 2>&1], [x86_no_fp_by_default=yes]) AM_CONDITIONAL(X86_64_AND_NO_FP_BY_DEFAULT, test "$x86_no_fp_by_default" = yes) rm fp.s CFLAGS="$OLD_CFLAGS" AC_MSG_RESULT([$x86_no_fp_by_default]) # We need to know if we're i386 so we can turn on -mmms, which is not # on by default for i386 (it is for x86_64). AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [return __i386__ == 1 ? 0 : 1])], [is_i386=yes], [is_i386=no]) AM_CONDITIONAL(I386, test "$is_i386" = yes) # See if the compiler supports -Wno-unused-result. # Newer ubuntu's turn on -D_FORTIFY_SOURCE=2, enabling # __attribute__((warn_unused_result)) for things like write(), # which we don't care about. AC_CACHE_CHECK([if the compiler supports -Wno-unused-result], perftools_cv_w_no_unused_result, [OLD_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -Wno-error -Wunused-result" # gcc doesn't warn about unknown flags unless it's # also warning for some other purpose, hence the # divide-by-0. (We use -Wno-error to make sure the # divide-by-0 doesn't cause this test to fail!) # # Also gcc is giving only warning for unknown flags of # -Wno-XXX form. So in order to detect support we're # using -Wunused-result which will cause gcc to give # error which we can detect. AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, return 1/0)], perftools_cv_w_no_unused_result=yes, perftools_cv_w_no_unused_result=no) CFLAGS="$OLD_CFLAGS"]) AM_CONDITIONAL(HAVE_W_NO_UNUSED_RESULT, test "$perftools_cv_w_no_unused_result" = yes) AC_ARG_ENABLE([dynamic-sized-delete-support], [AS_HELP_STRING([--disable-dynamic-sized-delete-support], [don't try to build run-time switch for sized delete operator])], [enable_dyn_sized_delete="$enableval"], [enable_dyn_sized_delete=default]) AS_IF([test "x$enable_dyn_sized_delete" = xdefault], [AC_CACHE_CHECK( [if the compiler supports ifunc attributes for target], [perftools_cv_ifunc_result], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([ void *resolve_foo() {return 0;} void foo() __attribute__((ifunc("resolve_foo"))); ],[foo();])], [perftools_cv_ifunc_result=yes], [perftools_cv_ifunc_result=no])])] [enable_dyn_sized_delete=$perftools_cv_ifunc_result]) AS_IF([test "x$enable_dyn_sized_delete" = xyes], [AC_DEFINE([ENABLE_DYNAMIC_SIZED_DELETE], 1, [Build runtime detection for sized delete])]) AC_ARG_ENABLE([sized-delete], [AS_HELP_STRING([--enable-sized-delete], [build sized delete operator])], [enable_sized_delete="$enableval"], [enable_sized_delete="no"]) AS_IF([test "x$enable_sized_delete" = xyes], [AC_DEFINE([ENABLE_SIZED_DELETE], 1, [Build sized deletion operators]) AC_MSG_NOTICE([Will build sized deallocation operators])], [AS_IF([test "x$enable_dyn_sized_delete" = xyes], [AC_MSG_NOTICE([Will build dynamically detected sized deallocation operators])], [AC_MSG_NOTICE([Will not build sized deallocation operators])])]) AS_IF([test "x$enable_sized_delete" = xyes -o "x$enable_dyn_sized_delete" = xyes], [AC_CACHE_CHECK([if C++ compiler supports -fsized-deallocation], perftools_cv_sized_deallocation_result, [AC_LANG_PUSH(C++) OLD_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -fsized-deallocation" AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], perftools_cv_sized_deallocation_result=yes, perftools_cv_sized_deallocation_result=no) CXXFLAGS="$OLD_CXXFLAGS" AC_LANG_POP(C++)])]) AM_CONDITIONAL(HAVE_SIZED_DEALLOCATION, test "$perftools_cv_sized_deallocation_result" = yes) # Defines PRIuS AC_COMPILER_CHARACTERISTICS # Also make sure we get standard PRI... definitions, even with glibc. # We have to use AH_VERBATIM because we need the #ifdef guard (gcc buglet) AH_VERBATIM([__STDC_FORMAT_MACROS], [/* C99 says: define this to get the PRI... macros from stdint.h */ #ifndef __STDC_FORMAT_MACROS # define __STDC_FORMAT_MACROS 1 #endif]) # Check if __builtin_stack_pointer() is available (for elfcore.h) AC_MSG_CHECKING([for __builtin_stack_pointer()]) AC_LINK_IFELSE([AC_LANG_PROGRAM(, [void *sp = __builtin_stack_pointer()])], [AC_DEFINE(HAVE_BUILTIN_STACK_POINTER, 1, Define to 1 if compiler supports __builtin_stack_pointer) AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no])]) # Check for __builtin_expect() AC_MSG_CHECKING([for __builtin_expect()]) AC_LINK_IFELSE([AC_LANG_PROGRAM(, return __builtin_expect(main != 0, 1))], [AC_DEFINE(HAVE_BUILTIN_EXPECT, 1, Define to 1 if compiler supports __builtin_expect) AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no])]) # Check if __environ is available (for GetenvBeforeMain) AC_MSG_CHECKING([for __environ]) AC_LINK_IFELSE([AC_LANG_PROGRAM([#include ], [char **env = __environ])], [AC_DEFINE(HAVE___ENVIRON, 1, [Define to 1 if compiler supports __environ]) AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no])]) # If we support __thread, that can speed up tcmalloc a bit. # Note, however, that our code tickles a bug in gcc < 4.1.2 # involving TLS and -fPIC (which our libraries will use) on x86: # http://gcc.gnu.org/ml/gcc-bugs/2006-09/msg02275.html # # And mingw also does compile __thread but resultant code actually # fails to work correctly at least in some not so ancient version: # http://mingw-users.1079350.n2.nabble.com/gcc-4-4-multi-threaded-exception-handling-amp-thread-specifier-not-working-td3440749.html # # Also it was reported that earlier gcc versions for mips compile # __thread but it doesn't really work AC_MSG_CHECKING([for __thread]) AC_LINK_IFELSE([AC_LANG_PROGRAM([#if defined(__GNUC__) && ((__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 1) || (__GNUC__ == 4 && __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ < 2)) #error gcc has this bug: http://gcc.gnu.org/ml/gcc-bugs/2006-09/msg02275.html #elif defined(__MINGW32__) #error mingw doesnt really support tls #elif defined(__APPLE__) #error OSX __thread support is known to call malloc which makes it unsafe to use from malloc replacement #endif ], [static __thread int p = 0])], [AC_DEFINE(HAVE_TLS, 1, Define to 1 if compiler supports __thread) AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no])]) # 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These all have header guards, so # the end result is if config.h is #included twice, its #undefs get # evaluated twice, but all the ones in mingw.h/etc only get evaluated # once, potentially causing trouble. c.f. # http://code.google.com/p/gperftools/issues/detail?id=246 AH_TOP([ #ifndef GPERFTOOLS_CONFIG_H_ #define GPERFTOOLS_CONFIG_H_ ]) AH_VERBATIM([PTHREADS_CRASHES_IF_RUN_TOO_EARLY], [/* Mark the systems where we know it's bad if pthreads runs too early before main (before threads are initialized, presumably). */ #ifdef __FreeBSD__ #define PTHREADS_CRASHES_IF_RUN_TOO_EARLY 1 #endif]) # MinGW uses autoconf, but also needs the windows shim routines # (since it doesn't have its own support for, say, pthreads). # This requires us to #include a special header file, and also to # link in some windows versions of .o's instead of the unix versions. # # Also, manually mark systems where we have to be careful how early # we run pthreads. TODO(csilvers): turn this into an autoconf check. AH_BOTTOM([ #ifdef __MINGW32__ #include "windows/mingw.h" #endif #endif /* #ifndef GPERFTOOLS_CONFIG_H_ */ ]) AM_CONDITIONAL(MINGW, expr $host : '.*-mingw' >/dev/null 2>&1) AM_CONDITIONAL(OSX, expr $host : '.*-apple-darwin.*' >/dev/null 2>&1) # Export the --enable flags we set above. We do this at the end so # other configure rules can enable or disable targets based on what # they find. AM_CONDITIONAL(WITH_CPU_PROFILER, test "$enable_cpu_profiler" = yes) AM_CONDITIONAL(WITH_HEAP_PROFILER, test "$enable_heap_profiler" = yes) AM_CONDITIONAL(WITH_HEAP_CHECKER, test "$enable_heap_checker" = yes) AM_CONDITIONAL(WITH_DEBUGALLOC, test "$enable_debugalloc" = yes) # We make tcmalloc.so if either heap-profiler or heap-checker is asked for. AM_CONDITIONAL(WITH_HEAP_PROFILER_OR_CHECKER, test "$enable_heap_profiler" = yes -o \ "$enable_heap_checker" = yes) # If we don't use any profilers, we don't need stack traces (or pprof) AM_CONDITIONAL(WITH_STACK_TRACE, test "$enable_cpu_profiler" = yes -o \ "$enable_heap_profiler" = yes -o \ "$enable_heap_checker" = yes) have_linux_sigev_thread_id=no AC_MSG_CHECKING([for Linux SIGEV_THREAD_ID]) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[#include #include ]], [[return SIGEV_THREAD_ID || CLOCK_THREAD_CPUTIME_ID || __linux;]])], [AC_DEFINE(HAVE_LINUX_SIGEV_THREAD_ID, 1, [Define if this is Linux that has SIGEV_THREAD_ID]) have_linux_sigev_thread_id=yes AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no])]) # Write generated configuration file AC_CONFIG_FILES([Makefile src/gperftools/tcmalloc.h src/windows/gperftools/tcmalloc.h]) AC_OUTPUT AS_IF([test "$x86_no_fp_by_default" = yes && test "x$enable_frame_pointers" != xyes && test "x$UNWIND_LIBS" = x && test "x$enable_minimal" != xyes], [AS_IF([test "x$enable_backtrace" = xyes], [AC_MSG_WARN([No frame pointers and no libunwind. 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