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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:21:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:21:29 +0000 |
commit | 29cd838eab01ed7110f3ccb2e8c6a35c8a31dbcc (patch) | |
tree | 63ef546b10a81d461e5cf5ed9e98a68cd7dee1aa /src/grep/m4/stack-direction.m4 | |
parent | Initial commit. (diff) | |
download | kbuild-29cd838eab01ed7110f3ccb2e8c6a35c8a31dbcc.tar.xz kbuild-29cd838eab01ed7110f3ccb2e8c6a35c8a31dbcc.zip |
Adding upstream version 1:0.1.9998svn3589+dfsg.upstream/1%0.1.9998svn3589+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/grep/m4/stack-direction.m4 | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/grep/m4/stack-direction.m4 b/src/grep/m4/stack-direction.m4 new file mode 100644 index 0000000..9328725 --- /dev/null +++ b/src/grep/m4/stack-direction.m4 @@ -0,0 +1,105 @@ +# stack-direction.m4 serial 7 +dnl Copyright (C) 2002-2021 Free Software Foundation, Inc. +dnl This file is free software, distributed under the terms of the GNU +dnl General Public License. As a special exception to the GNU General +dnl Public License, this file may be distributed as part of a program +dnl that contains a configuration script generated by Autoconf, under +dnl the same distribution terms as the rest of that program. + +dnl Written by Bruno Haible. + +# Determine the stack direction. Define the C macro STACK_DIRECTION. +AC_DEFUN([SV_STACK_DIRECTION], +[ + AC_REQUIRE([AC_CANONICAL_HOST]) + AC_CACHE_CHECK([for stack direction], [sv_cv_stack_direction_msg], [ + case "$host_cpu" in + dnl See the #define STACK_GROWS_DOWNWARD in gcc-3.1/gcc/config/*/*.h. + a29k | \ + aarch64* | \ + alpha* | \ + arc | \ + arm* | strongarm* | xscale* | \ + avr | avr32 | \ + bfin | \ + c1 | c2 | c32 | c34 | c38 | \ + clipper | \ + cris | \ + d30v | \ + elxsi | \ + fr30 | \ + h8300 | \ + i?86 | x86_64 | \ + i860 | \ + ia64 | \ + m32r | \ + m68* | \ + m88k | \ + mcore | \ + microblaze | \ + mips* | \ + mmix | \ + mn10200 | \ + mn10300 | \ + nios2 | \ + nds32* | \ + ns32k | \ + pdp11 | \ + pj* | \ + powerpc* | rs6000 | \ + riscv* | \ + romp | \ + s390* | \ + sh* | \ + sparc* | \ + v850 | \ + vax | \ + xtensa) + sv_cv_stack_direction=-1 ;; + c4x | \ + dsp16xx | \ + i960 | \ + hppa* | parisc* | \ + stormy16 | \ + we32k) + sv_cv_stack_direction=1 ;; + *) + if test $cross_compiling = no; then + cat > conftest.c <<EOF +#include <stdio.h> +int +find_stack_direction (int *addr, int depth) +{ + int dir, dummy = 0; + if (! addr) + addr = &dummy; + *addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1; + dir = depth ? find_stack_direction (addr, depth - 1) : 0; + return dir + dummy; +} +int +main (int argc, char *argv[]) +{ + printf ("%d\n", find_stack_direction (NULL, argc + 20)); + return 0; +} +EOF + AC_TRY_EVAL([ac_link]) + sv_cv_stack_direction=`./conftest` + else + sv_cv_stack_direction=0 + fi + ;; + esac + case $sv_cv_stack_direction in + 1) sv_cv_stack_direction_msg="grows up";; + -1) sv_cv_stack_direction_msg="grows down";; + *) sv_cv_stack_direction_msg="unknown";; + esac + ]) + AC_DEFINE_UNQUOTED([STACK_DIRECTION], [$sv_cv_stack_direction], + [Define as the direction of stack growth for your system. + STACK_DIRECTION > 0 => grows toward higher addresses + STACK_DIRECTION < 0 => grows toward lower addresses + STACK_DIRECTION = 0 => spaghetti stack.]) +]) |