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v3.13.13
aclocal.m4
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Erlend E. Aasland
[3.13] gh-89640: harden float word ordering (#125571 and #126387) (#126429)
06 ноя 2024, 01:18
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06 ноя 2024, 01:18
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# generated automatically by aclocal 1.16.5 -*- Autoconf -*- # Copyright (C) 1996-2021 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program 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. m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])]) # =============================================================================== # https://www.gnu.org/software/autoconf-archive/ax_c_float_words_bigendian.html # =============================================================================== # # SYNOPSIS # # AX_C_FLOAT_WORDS_BIGENDIAN([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN]) # # DESCRIPTION # # Checks the ordering of words within a multi-word float. This check is # necessary because on some systems (e.g. certain ARM systems), the float # word ordering can be different from the byte ordering. In a multi-word # float context, "big-endian" implies that the word containing the sign # bit is found in the memory location with the lowest address. This # implementation was inspired by the AC_C_BIGENDIAN macro in autoconf. # # The endianness is detected by first compiling C code that contains a # special double float value, then grepping the resulting object file for # certain strings of ASCII values. The double is specially crafted to have # a binary representation that corresponds with a simple string. In this # implementation, the string "noonsees" was selected because the # individual word values ("noon" and "sees") are palindromes, thus making # this test byte-order agnostic. If grep finds the string "noonsees" in # the object file, the target platform stores float words in big-endian # order. If grep finds "seesnoon", float words are in little-endian order. # If neither value is found, the user is instructed to specify the # ordering. # # Early versions of this macro (i.e., before serial 12) would not work # when interprocedural optimization (via link-time optimization) was # enabled. This would happen when, say, the GCC/clang "-flto" flag, or the # ICC "-ipo" flag was used, for example. The problem was that under # these conditions, the compiler did not allocate for and write the special # float value in the data segment of the object file, since doing so might # not prove optimal once more context was available. Thus, the special value # (in platform-dependent binary form) could not be found in the object file, # and the macro would fail. # # The solution to the above problem was to: # # 1) Compile and link a whole test program rather than just compile an # object file. This ensures that we reach the point where even an # interprocedural optimizing compiler writes values to the data segment. # # 2) Add code that requires the compiler to write the special value to # the data segment, as opposed to "optimizing away" the variable's # allocation. This could be done via compiler keywords or options, but # it's tricky to make this work for all versions of all compilers with # all optimization settings. The chosen solution was to make the exit # code of the test program depend on the storing of the special value # in memory (in the data segment). Because the exit code can be # verified, any compiler that aspires to be correct will produce a # program binary that contains the value, which the macro can then find. # # How does the exit code depend on the special value residing in memory? # Memory, unlike variables and registers, can be addressed indirectly at run # time. The exit code of this test program is a result of indirectly reading # and writing to the memory region where the special value is supposed to # reside. The actual memory addresses used and the values to be written are # derived from the the program input ("argv") and are therefore not known at # compile or link time. The compiler has no choice but to defer the # computation to run time, and to prepare by allocating and populating the # data segment with the special value. For further details, refer to the # source code of the test program. # # Note that the test program is never meant to be run. It only exists to host # a double float value in a given platform's binary format. Thus, error # handling is not included. # # LICENSE # # Copyright (c) 2008, 2023 Daniel Amelang <dan@amelang.net> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 12 AC_DEFUN([AX_C_FLOAT_WORDS_BIGENDIAN], [AC_CACHE_CHECK(whether float word ordering is bigendian, ax_cv_c_float_words_bigendian, [ ax_cv_c_float_words_bigendian=unknown AC_LINK_IFELSE([AC_LANG_SOURCE([[ #include <stdlib.h> static double m[] = {9.090423496703681e+223, 0.0}; int main (int argc, char *argv[]) { m[atoi (argv[1])] += atof (argv[2]); return m[atoi (argv[3])] > 0.0; } ]])], [ if grep noonsees conftest$EXEEXT >/dev/null ; then ax_cv_c_float_words_bigendian=yes fi if grep seesnoon conftest$EXEEXT >/dev/null ; then if test "$ax_cv_c_float_words_bigendian" = unknown; then ax_cv_c_float_words_bigendian=no else ax_cv_c_float_words_bigendian=unknown fi fi ])]) case $ax_cv_c_float_words_bigendian in yes) m4_default([$1], [AC_DEFINE([FLOAT_WORDS_BIGENDIAN], 1, [Define to 1 if your system stores words within floats with the most significant word first])]) ;; no) $2 ;; *) m4_default([$3], [AC_MSG_ERROR([ Unknown float word ordering. You need to manually preset ax_cv_c_float_words_bigendian=no (or yes) according to your system. ])]) ;; esac ])# AX_C_FLOAT_WORDS_BIGENDIAN # =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html # =========================================================================== # # SYNOPSIS # # AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) # # DESCRIPTION # # Check whether the given FLAG works with the current language's compiler # or gives an error. (Warnings, however, are ignored) # # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on # success/failure. # # If EXTRA-FLAGS is defined, it is added to the current language's default # flags (e.g. CFLAGS) when the check is done. The check is thus made with # the flags: "CFLAGS EXTRA-FLAGS FLAG". 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