[PATCH] libstdc++: detect DLLs on windows with <stacktrace>

[Jonathan Wakely]

On Thu, 16 May 2024 at 19:52, Björn Schäpers <gcc@hazardy.de> wrote:
>
> From: Björn Schäpers <bjoern@hazardy.de>
>
> libstdc++-v3/Changelog
>
>         * acinclude.m4 (GLIBCXX_ENABLE_BACKTACE): Add check for
>           tlhelp32.h, matching libbacktrace.
>         * configure: Regenerate.
>         * config.h.in: Regenerate.

This looks good, thanks. I'll apply to trunk and probably backport it too.


>
> Signed-off-by: Björn Schäpers <bjoern@hazardy.de>
> ---
>  libstdc++-v3/acinclude.m4 |  4 ++++
>  libstdc++-v3/config.h.in  |  3 +++
>  libstdc++-v3/configure    | 15 +++++++++++++++
>  3 files changed, 22 insertions(+)
>
> diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
> index 51a08bcc8b1..506ce98ae43 100644
> --- a/libstdc++-v3/acinclude.m4
> +++ b/libstdc++-v3/acinclude.m4
> @@ -5481,6 +5481,10 @@ AC_DEFUN([GLIBCXX_ENABLE_BACKTRACE], [
>      BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_DL_ITERATE_PHDR=1"
>    fi
>    AC_CHECK_HEADERS(windows.h)
> +  AC_CHECK_HEADERS(tlhelp32.h, [], [],
> +  [#ifdef HAVE_WINDOWS_H
> +  #  include <windows.h>
> +  #endif])
>
>    # Check for the fcntl function.
>    if test -n "${with_target_subdir}"; then
> diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
> index 906e0143099..486ba450749 100644
> --- a/libstdc++-v3/config.h.in
> +++ b/libstdc++-v3/config.h.in
> @@ -490,6 +490,9 @@
>  /* Define to 1 if you have the `timespec_get' function. */
>  #undef HAVE_TIMESPEC_GET
>
> +/* Define to 1 if you have the <tlhelp32.h> header file. */
> +#undef HAVE_TLHELP32_H
> +
>  /* Define to 1 if the target supports thread-local storage. */
>  #undef HAVE_TLS
>
> diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
> index 21abaeb0778..a2d59520146 100755
> --- a/libstdc++-v3/configure
> +++ b/libstdc++-v3/configure
> @@ -53865,6 +53865,21 @@ _ACEOF
>
>  fi
>
> +done
> +
> +  for ac_header in tlhelp32.h
> +do :
> +  ac_fn_c_check_header_compile "$LINENO" "tlhelp32.h" "ac_cv_header_tlhelp32_h" "#ifdef HAVE_WINDOWS_H
> +  #  include <windows.h>
> +  #endif
> +"
> +if test "x$ac_cv_header_tlhelp32_h" = xyes; then :
> +  cat >>confdefs.h <<_ACEOF
> +#define HAVE_TLHELP32_H 1
> +_ACEOF
> +
> +fi
> +
>  done
>
>
> --
> 2.44.0
>