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generated by cgit-pink 1.4.1 (git 2.36.1) at 2025-04-24 19:44:05 +0000


 


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Notes on the source code
========================

The mechanism to generate the system error codes is delicate and
fragile, but it's the best I could come up with that supports
cross-compilation and dynamic self-configuration.  Here is how it
works:

1. Generate list of supported system error codes.

mkerrcodes1.awk generates a list of supported system error codes from
errnos.in.  Each entry in the list is protected with #ifdef/#endif,
and contains a GPG_ERR_* marker.  The list is stored in "_mkerrcodes.h".

2. The HOST cpp is run on _mkerrcodes.h.  This evaluates the known
system error macros to something (may be a number, maybe a constant
expression as on the GNU/Hurd), suppressing the unknown ones.  The
output is piped into step 3.

3. The cpp output is filtered with grep for only those lines which
contain a GPG_ERR_* marker.  The output is piped into step 4.

4. The filtered output is processed by mkerrcodes.awk, which produces
a table of constant expressions plus GPG_ERR_* code string symbols in
a format suitable for the C program mkerrcodes.c.  At this point we
are crossing our fingers that the constant expressions produced by the
system do not contain GPG_ERR_* markers.  The output is stored in
mkerrcodes.h.

5. The file mkerrcodes.h is included by mkerrcodes.c, which is
compiled to a binary executable on the BUILD system.  At this point we
are crossing our fingers that the constant expressions produced by the
system do not depend on the build platform anymore.  The output is
post-processed by mkerrcodes2.awk and stored in "code-from-errno.h",
which is subsequently used in the library.

-- Marcus

 Copyright 2006 g10 Code GmbH

 This file is free software; as a special exception the author gives
 unlimited permission to copy and/or distribute it, with or without
 modifications, as long as this notice is preserved.

 This file is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


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# libgcrypt.m4 - Autoconf macros to detect libgcrypt
# Copyright (C) 2002, 2003, 2004, 2011, 2014, 2018 g10 Code GmbH
#
# This file is free software; as a special exception the author gives
# unlimited permission to copy and/or distribute it, with or without
# modifications, as long as this notice is preserved.
#
# This file is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Last-changed: 2018-11-13


dnl AM_PATH_LIBGCRYPT([MINIMUM-VERSION,
dnl                   [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
dnl Test for libgcrypt and define LIBGCRYPT_CFLAGS and LIBGCRYPT_LIBS.
dnl MINIMUN-VERSION is a string with the version number optionalliy prefixed
dnl with the API version to also check the API compatibility. Example:
dnl a MINIMUN-VERSION of 1:1.2.5 won't pass the test unless the installed
dnl version of libgcrypt is at least 1.2.5 *and* the API number is 1.  Using
dnl this features allows to prevent build against newer versions of libgcrypt
dnl with a changed API.
dnl
dnl If a prefix option is not used, the config script is first
dnl searched in $SYSROOT/bin and then along $PATH.  If the used
dnl config script does not match the host specification the script
dnl is added to the gpg_config_script_warn variable.
dnl
AC_DEFUN([AM_PATH_LIBGCRYPT],
[ AC_REQUIRE([AC_CANONICAL_HOST])
  AC_ARG_WITH(libgcrypt-prefix,
            AC_HELP_STRING([--with-libgcrypt-prefix=PFX],
                           [prefix where LIBGCRYPT is installed (optional)]),
     libgcrypt_config_prefix="$withval", libgcrypt_config_prefix="")
  if test x"${LIBGCRYPT_CONFIG}" = x ; then
     if test x"${libgcrypt_config_prefix}" != x ; then
        LIBGCRYPT_CONFIG="${libgcrypt_config_prefix}/bin/libgcrypt-config"
     fi
  fi

  use_gpgrt_config=""
  if test x"${LIBGCRYPT_CONFIG}" = x -a x"$GPGRT_CONFIG" != x -a "$GPGRT_CONFIG" != "no"; then
    if $GPGRT_CONFIG libgcrypt --exists; then
      LIBGCRYPT_CONFIG="$GPGRT_CONFIG libgcrypt"
      AC_MSG_NOTICE([Use gpgrt-config as libgcrypt-config])
      use_gpgrt_config=yes
    fi
  fi
  if test -z "$use_gpgrt_config"; then
    if test x"${LIBGCRYPT_CONFIG}" = x ; then
      case "${SYSROOT}" in
         /*)
           if test -x "${SYSROOT}/bin/libgcrypt-config" ; then
             LIBGCRYPT_CONFIG="${SYSROOT}/bin/libgcrypt-config"
           fi
           ;;
         '')
           ;;
          *)
           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
           ;;
      esac
    fi
    AC_PATH_PROG(LIBGCRYPT_CONFIG, libgcrypt-config, no)
  fi

  tmp=ifelse([$1], ,1:1.2.0,$1)
  if echo "$tmp" | grep ':' >/dev/null 2>/dev/null ; then
     req_libgcrypt_api=`echo "$tmp"     | sed 's/\(.*\):\(.*\)/\1/'`
     min_libgcrypt_version=`echo "$tmp" | sed 's/\(.*\):\(.*\)/\2/'`
  else
     req_libgcrypt_api=0
     min_libgcrypt_version="$tmp"
  fi

  AC_MSG_CHECKING(for LIBGCRYPT - version >= $min_libgcrypt_version)
  ok=no
  if test "$LIBGCRYPT_CONFIG" != "no" ; then
    req_major=`echo $min_libgcrypt_version | \
               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
    req_minor=`echo $min_libgcrypt_version | \
               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
    req_micro=`echo $min_libgcrypt_version | \
               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`
    if test -z "$use_gpgrt_config"; then
      libgcrypt_config_version=`$LIBGCRYPT_CONFIG --version`
    else
      libgcrypt_config_version=`$LIBGCRYPT_CONFIG --modversion`
    fi
    major=`echo $libgcrypt_config_version | \
               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
    minor=`echo $libgcrypt_config_version | \
               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
    micro=`echo $libgcrypt_config_version | \
               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\3/'`
    if test "$major" -gt "$req_major"; then
        ok=yes
    else
        if test "$major" -eq "$req_major"; then
            if test "$minor" -gt "$req_minor"; then
               ok=yes
            else
               if test "$minor" -eq "$req_minor"; then
                   if test "$micro" -ge "$req_micro"; then
                     ok=yes
                   fi
               fi
            fi
        fi
    fi
  fi
  if test $ok = yes; then
    AC_MSG_RESULT([yes ($libgcrypt_config_version)])
  else
    AC_MSG_RESULT(no)
  fi
  if test $ok = yes; then
     # If we have a recent libgcrypt, we should also check that the
     # API is compatible
     if test "$req_libgcrypt_api" -gt 0 ; then
        if test -z "$use_gpgrt_config"; then
           tmp=`$LIBGCRYPT_CONFIG --api-version 2>/dev/null || echo 0`
	else
           tmp=`$LIBGCRYPT_CONFIG --variable=api_version 2>/dev/null || echo 0`
	fi
        if test "$tmp" -gt 0 ; then
           AC_MSG_CHECKING([LIBGCRYPT API version])
           if test "$req_libgcrypt_api" -eq "$tmp" ; then
             AC_MSG_RESULT([okay])
           else
             ok=no
             AC_MSG_RESULT([does not match. want=$req_libgcrypt_api got=$tmp])
           fi
        fi
     fi
  fi
  if test $ok = yes; then
    LIBGCRYPT_CFLAGS=`$LIBGCRYPT_CONFIG --cflags`
    LIBGCRYPT_LIBS=`$LIBGCRYPT_CONFIG --libs`
    ifelse([$2], , :, [$2])
    if test -z "$use_gpgrt_config"; then
      libgcrypt_config_host=`$LIBGCRYPT_CONFIG --host 2>/dev/null || echo none`
    else
      libgcrypt_config_host=`$LIBGCRYPT_CONFIG --variable=host 2>/dev/null || echo none`
    fi
    if test x"$libgcrypt_config_host" != xnone ; then
      if test x"$libgcrypt_config_host" != x"$host" ; then
  AC_MSG_WARN([[
***
*** The config script "$LIBGCRYPT_CONFIG" was
*** built for $libgcrypt_config_host and thus may not match the
*** used host $host.
*** You may want to use the configure option --with-libgcrypt-prefix
*** to specify a matching config script or use \$SYSROOT.
***]])
        gpg_config_script_warn="$gpg_config_script_warn libgcrypt"
      fi
    fi
  else
    LIBGCRYPT_CFLAGS=""
    LIBGCRYPT_LIBS=""
    ifelse([$3], , :, [$3])
  fi
  AC_SUBST(LIBGCRYPT_CFLAGS)
  AC_SUBST(LIBGCRYPT_LIBS)
])