kc3-lang/gnulib/m4/stack-trace.m4

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• m4/stack-trace.m4

• # stack-trace.m4
  # serial 4
  dnl Copyright (C) 2024-2025 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
  dnl This file is offered as-is, without any warranty.
  
  AC_DEFUN([gl_STACK_TRACE_EARLY],
  [
    AC_MSG_CHECKING([whether to enable debugging facilities])
    AC_ARG_ENABLE([debug],
      [AS_HELP_STRING([[--disable-debug]],
         [turn off debugging facilities])],
      [case "$enableval" in
         yes | no) ;;
         *) AC_MSG_WARN([invalid argument supplied to --enable-debug])
            enable_debug=yes
            ;;
       esac
      ],
      [enable_debug=yes])
    AC_MSG_RESULT([$enable_debug])
  
    AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
    if test $enable_debug = yes; then
      dnl The first choice is libbacktrace by Ian Lance Taylor.
      dnl Maintained at https://github.com/ianlancetaylor/libbacktrace,
      dnl mirrored into GCC, installed as part of GCC by a few distros.
      dnl It produces source file names and line numbers, if the binary
      dnl is compiled with debug information.
      AC_CACHE_CHECK([for libbacktrace], [gl_cv_lib_backtrace], [
        gl_saved_LIBS="$LIBS"
        LIBS="$gl_saved_LIBS -lbacktrace"
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#include <backtrace.h>
             ]],
             [[struct backtrace_state *state =
                 backtrace_create_state (NULL, 0, NULL, NULL);
             ]])],
          [gl_cv_lib_backtrace=yes],
          [gl_cv_lib_backtrace=no])
        LIBS="$gl_saved_LIBS"
      ])
      if test $gl_cv_lib_backtrace = yes; then
        AC_DEFINE([HAVE_LIBBACKTRACE], [1],
          [Define if you have the libbacktrace library.])
        CAN_PRINT_STACK_TRACE=1
        LIBS="$LIBS -lbacktrace"
      else
        dnl The second choice is libexecinfo.
        dnl It does not produce source file names and line numbers, only addresses
        dnl (which are mostly useless due to ASLR) and _sometimes_ function names.
        AC_REQUIRE([AC_CANONICAL_HOST])
        case "$host_os" in
          *-gnu* | gnu* | darwin* | freebsd* | dragonfly* | netbsd* | openbsd* | solaris*)
            dnl execinfo might be implemented on this platform.
            CAN_PRINT_STACK_TRACE=1
            dnl On *BSD system, link all programs with -lexecinfo, provided that
            dnl libexecinfo actually exists. Cf. m4/execinfo.m4.
            case "$host_os" in
              freebsd* | dragonfly* | netbsd* | openbsd*)
                AC_SEARCH_LIBS([backtrace_symbols_fd], [execinfo],
                  [], [CAN_PRINT_STACK_TRACE=0])
                if test $CAN_PRINT_STACK_TRACE = 1; then
                  LIBS="$LIBS -lexecinfo"
                fi
                ;;
            esac
            if test $CAN_PRINT_STACK_TRACE = 1; then
              dnl Link all programs in such a way that the stack trace includes
              dnl the function names.
              dnl '-rdynamic' is equivalent to '-Wl,-export-dynamic'.
              case "$host_os" in
                *-gnu* | gnu* | openbsd*)
                  LDFLAGS="$LDFLAGS -rdynamic"
                  ;;
              esac
            fi
            ;;
        esac
      fi
    fi
  ])
  
  AC_DEFUN([gl_STACK_TRACE],
  [
    AC_REQUIRE([AC_C_INLINE])
  ])
  

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