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|
dnl xiph_compiler.m4
dnl $Id$
dnl XIPH_FUNC_VA_COPY
dnl Karl Heyes
dnl
# XIPH_FUNC_VA_COPY
# Test for implementation of va_copy, or define appropriately if missing
AC_DEFUN([XIPH_FUNC_VA_COPY],
[dnl
AC_MSG_CHECKING([for va_copy])
AC_TRY_LINK([#include <stdarg.h>], [va_list ap1, ap2; va_copy(ap1, ap2);],
AC_MSG_RESULT([va_copy]),
[dnl
AH_TEMPLATE([va_copy], [define if va_copy is not available])
AC_TRY_LINK([#include <stdarg.h>], [va_list ap1, ap2; __va_copy(ap1, ap2);],
[dnl
AC_DEFINE([va_copy], [__va_copy])
AC_MSG_RESULT([__va_copy])],
[dnl
AC_DEFINE([va_copy(dest,src)], [memcpy(&dest,&src,sizeof(va_list))])
AC_MSG_RESULT([memcpy])
])
])
])
])dnl XIPH_FUNC_VA_COPY
dnl XIPH_C_ATTRIBUTE
dnl Karl Heyes
dnl
# XIPH_C_ATTRIBUTE
# Define __attribute__ to be empty if the compiler does not support it
AC_DEFUN([XIPH_C_ATTRIBUTE],
[dnl
AC_TRY_COMPILE([int func(void) __attribute__((unused));],
[int x __attribute__ ((unused));],,[dnl
AH_TEMPLATE([__attribute__],[Define to empty if __attribute__ is not supported])
AC_DEFINE([__attribute__(x)],[])
])
])dnl XIPH_C_ATTRIBUTE
dnl XIPH_GCC_WARNING
dnl Karl Heyes
dnl
# XIPH_GCC_WARNING(flag, action-if-warning, action-if-not)
# Tests whether GCC emits a warning if explicitly asked to use flag.
# Useful for eg system default include paths
AC_DEFUN([XIPH_GCC_WARNING],
[AC_REQUIRE([AC_PROG_CC])
xt_warning=no
if test x"$GCC" = "xyes"
then
save_cflags="$CFLAGS"
CFLAGS="-Werror $1"
AC_TRY_COMPILE(,,,xt_warning=yes)
CFLAGS="$save_cflags"
fi
if test "$xt_warning" = "yes"
then
ifelse([$2],,:,[$2])
else
ifelse([$3],,:,[$3])
fi
])dnl XIPH_GCC_WARNING
dnl XIPH_CLEAN_CCFLAGS
dnl Brendan Cully <brendan@xiph.org> 20030612
dnl
# XIPH_CLEAN_CCFLAGS(flag-list, dest-shell-var-name)
# Filters out duplicate compiler flags, and -I flags if XIPH_GCC_WARNING
# complains about them
# Operates right-to-left on -l flags, left-to-right on everything else
# eg XIPH_CLEAN_CCFLAGS([-L/opt/lib -lfoo -lm -L/opt/lib -lbar -lm], [MY_LDFLAGS])
# => MY_LDFLAGS="-L/opt/lib -lfoo -lbar -lm"
# the cat<<EOF construct makes sure echo doesn't pick, say, -n
AC_DEFUN([XIPH_CLEAN_CCFLAGS],
[AC_REQUIRE([AC_PROG_FGREP])
xt_FLAGS=''
for flag in $1
do
case "$flag" in
-l*)
xt_FLAGS="$flag $xt_FLAGS"
;;
*)
if { cat <<EOF
$xt_FLAGS x
EOF
} | $FGREP -v -e " $flag " > /dev/null
then
xt_FLAGS="$flag $xt_FLAGS"
fi
;;
esac
done
$2=''
for flag in $xt_FLAGS
do
if { cat <<EOF
$$2 x
EOF
} | $FGREP -v -e " $flag " > /dev/null
then
$2="$flag $$2"
fi
done
# Prune -I flags if $CC warns about them
xt_FLAGS=''
for flag in $$2
do
case "$flag" in
-I*)
XIPH_GCC_WARNING([$flag], [], [xt_FLAGS="$xt_FLAGS $flag"])
;;
*)
xt_FLAGS="$xt_FLAGS $flag"
;;
esac
done
$2="$xt_FLAGS"
])dnl XIPH_CLEAN_CCFLAGS
dnl XIPH_VAR_APPEND
dnl Karl Heyes
dnl
# XIPH_VAR_APPEND(shell-var, list)
# Append each item in list to shell-var iff shell-var doesn't already have it
# eg XIPH_VAR_APPEND([CFLAGS], [-O2 -I/opt/packages/include])
AC_DEFUN([XIPH_VAR_APPEND],
[dnl
AC_REQUIRE([AC_PROG_FGREP])
for arg in $2
do
if { cat <<EOF
$$1 x
EOF
} | $FGREP -v -e " $arg " > /dev/null
then
$1="$$1 $arg"
fi
done
])dnl XIPH_VAR_APPEND
dnl XIPH_VAR_PREPEND
dnl Karl Heyes
dnl
# XIPH_VAR_PREPEND(shell-var, list)
# see XIPH_VAR_APPEND
AC_DEFUN([XIPH_VAR_PREPEND],
[dnl
AC_REQUIRE([AC_PROG_FGREP])
xt_compare="$$1"
xt_filtered=""
for arg in $2
do
if { cat <<EOF
$xt_compare x
EOF
} | $FGREP -v -e " $arg " > /dev/null
then
xt_compare="$arg $xt_compare"
xt_filtered="$xt_filtered $arg"
fi
done
$1="$xt_filtered $$1"
])dnl XIPH_VAR_PREPEND
dnl XIPH_C__FUNC__
dnl Karl Heyes <karl@xiph.org> 07/2004
AC_DEFUN([XIPH_C__FUNC__],
[dnl
AC_MSG_CHECKING([for __func__])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[const char *x = __func__;])],
[ AC_MSG_RESULT([yes])],
[ AH_TEMPLATE([__func__], [Replace __func__ if not supported])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[const char *x = __FUNCTION__;])],
[ AC_DEFINE([__func__],[__FUNCTION__])
AC_MSG_RESULT([Using __FUNCTION__])],
[ AC_DEFINE([__func__],["__FILE__"])
AC_MSG_RESULT([using __FILE__])
])
])
])dnl XIPH_C__FUNC__
|
