gen-lock-obj.sh - mozsearch

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#! /bin/sh

# gen-lock-obj.sh - Build tool to construct the lock object.

# Copyright (C) 2020, 2021  g10 Code GmbH

# This file is part of libgpg-error.

# libgpg-error is free software; you can redistribute it and/or

# modify it under the terms of the GNU Lesser General Public License

# as published by the Free Software Foundation; either version 2.1 of

# the License, or (at your option) any later version.

# libgpg-error is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public

# License along with this program; if not, see <https://www.gnu.org/licenses/>.

# Following variables should be defined to invoke this script

#   CC

#   OBJDUMP

#   AWK

#   ac_ext

#   ac_object

#   host

#   LOCK_ABI_VERSION

# An example:

# LOCK_ABI_VERSION=1 host=x86_64-pc-linux-gnu host_alias=x86_64-linux-gnu \

#     CC=$host_alias-gcc OBJDUMP=$host_alias-objdump ac_ext=c ac_objext=o \

#     AWK=gawk ./gen-lock-obj.sh

if test -n `echo -n`; then

    ECHO_C='\c'

    ECHO_N=''

else

    ECHO_C=''

    ECHO_N='-n'

fi

if test "$1" = --disable-threads; then

    cat <<EOF

## lock-obj-pub.$host.h - NO LOCK SUPPORT

## File created by gen-lock-obj.sh - DO NOT EDIT

## To be included by mkheader into gpg-error.h

/* Dummy object - no locking available.  */

typedef struct

  long _vers;

} gpgrt_lock_t;

#define GPGRT_LOCK_INITIALIZER {-1}

EOF

else

AWK_VERSION_OUTPUT=$($AWK 'BEGIN { print PROCINFO["version"] }')

if test -n "$AWK_VERSION_OUTPUT"; then

    # It's GNU awk, which supports PROCINFO.

    AWK_OPTION=--non-decimal-data

fi

cat <<'EOF' >conftest.$ac_ext

#include <pthread.h>

pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;

EOF

if $CC -c conftest.$ac_ext; then :

  ac_mtx_size=$($OBJDUMP -j .bss -t conftest.$ac_objext \

         | $AWK $AWK_OPTION '

/mtx$/ { mtx_size = int("0x" $5) }

END { print mtx_size }')

else

    echo "Can't determine mutex size"

    exit 1

fi

rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext

cat <<EOF

## lock-obj-pub.$host.h

## File created by gen-lock-obj.sh - DO NOT EDIT

## To be included by mkheader into gpg-error.h

typedef struct

  long _vers;

  union {

    volatile char _priv[$ac_mtx_size];

    long _x_align;

    long *_xp_align;

  } u;

} gpgrt_lock_t;

EOF

# FIXME: Support different alignment conditions of:

#     USE_16BYTE_ALIGNMENT

#     USE_DOUBLE_FOR_ALIGNMENT

#     USE_LONG_DOUBLE_FOR_ALIGNMENT

echo ${ECHO_N} "#define GPGRT_LOCK_INITIALIZER {$LOCK_ABI_VERSION,{{${ECHO_C}"

i=0

while test "$i" -lt $ac_mtx_size; do

    if test "$i" -ne 0 -a "$(( $i % 8 ))" -eq 0; then

        echo ' \'

        echo ${ECHO_N} "                                    ${ECHO_C}"

fi

    echo ${ECHO_N} "0${ECHO_C}"

    if test "$i" -lt $(($ac_mtx_size - 1)); then

        echo ${ECHO_N} ",${ECHO_C}"

fi

    i=$(( i + 1 ))

done

fi

cat <<'EOF'

}}}

##

## Local Variables:

## mode: c

## buffer-read-only: t

## End:

##

EOF

exit 0