mirror of
https://github.com/ianlancetaylor/libbacktrace.git
synced 2026-03-13 13:59:07 +08:00
559ab7cab4
This adds DWARF 5 support as well as an enhanced testsuite. Patch assembled by Than McIntosh.
117 lines
4.0 KiB
Plaintext
117 lines
4.0 KiB
Plaintext
dnl Fix Autoconf bugs by overriding broken internal Autoconf
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dnl macros with backports of fixes from newer releases.
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dnl
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dnl The override bits of this file should be a no-op for the newest
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dnl Autoconf version, which means they can be removed once the complete
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dnl tree has moved to a new enough Autoconf version.
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dnl
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dnl The _GCC_AUTOCONF_VERSION_TEST ensures that exactly the desired
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dnl Autoconf version is used. It should be kept for consistency.
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dnl Use ifdef/ifelse over m4_ifdef/m4_ifelse to be clean for 2.13.
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ifdef([m4_PACKAGE_VERSION], [
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dnl Provide m4_copy_force and m4_rename_force for old Autoconf versions.
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m4_ifndef([m4_copy_force],
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[m4_define([m4_copy_force],
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[m4_ifdef([$2], [m4_undefine([$2])])m4_copy($@)])])
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m4_ifndef([m4_rename_force],
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[m4_define([m4_rename_force],
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[m4_ifdef([$2], [m4_undefine([$2])])m4_rename($@)])])
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dnl AC_DEFUN a commonly used macro so this file is picked up.
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m4_copy([AC_PREREQ], [_AC_PREREQ])
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AC_DEFUN([AC_PREREQ], [frob])
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m4_copy_force([_AC_PREREQ], [AC_PREREQ])
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dnl Ensure exactly this Autoconf version is used
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m4_ifndef([_GCC_AUTOCONF_VERSION],
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[m4_define([_GCC_AUTOCONF_VERSION], [2.69])])
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dnl Test for the exact version when AC_INIT is expanded.
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dnl This allows to update the tree in steps (for testing)
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dnl by putting
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dnl m4_define([_GCC_AUTOCONF_VERSION], [X.Y])
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dnl in configure.ac before AC_INIT,
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dnl without rewriting this file.
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dnl Or for updating the whole tree at once with the definition above.
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AC_DEFUN([_GCC_AUTOCONF_VERSION_CHECK],
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[m4_if(m4_defn([_GCC_AUTOCONF_VERSION]),
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m4_defn([m4_PACKAGE_VERSION]), [],
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[m4_fatal([Please use exactly Autoconf ]_GCC_AUTOCONF_VERSION[ instead of ]m4_defn([m4_PACKAGE_VERSION])[.])])
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])
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m4_define([AC_INIT], m4_defn([AC_INIT])[
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_GCC_AUTOCONF_VERSION_CHECK
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])
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dnl Ensure we do not use a buggy M4.
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m4_if(m4_index([..wi.d.], [.d.]), [-1],
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[m4_fatal(m4_do([m4 with buggy strstr detected. Please install
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GNU M4 1.4.16 or newer and set the M4 environment variable]))])
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dnl Fix 2.64 cross compile detection for AVR and RTEMS
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dnl by not trying to compile fopen.
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m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.64],
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[m4_foreach([_GCC_LANG], [C, C++, Fortran, Fortran 77],
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[m4_define([_AC_LANG_IO_PROGRAM(]_GCC_LANG[)], m4_defn([AC_LANG_PROGRAM(]_GCC_LANG[)]))])])
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m4_version_prereq([2.66],, [
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dnl We need AC_CHECK_DECL which works for overloaded C++ functions.
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# _AC_CHECK_DECL_BODY
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# -------------------
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# Shell function body for AC_CHECK_DECL.
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m4_define([_AC_CHECK_DECL_BODY],
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[ AS_LINENO_PUSH([$[]1])
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[as_decl_name=`echo $][2|sed 's/ *(.*//'`]
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[as_decl_use=`echo $][2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`]
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AC_CACHE_CHECK([whether $as_decl_name is declared], [$[]3],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]4],
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[@%:@ifndef $[]as_decl_name
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@%:@ifdef __cplusplus
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(void) $[]as_decl_use;
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@%:@else
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(void) $[]as_decl_name;
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@%:@endif
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@%:@endif
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])],
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[AS_VAR_SET([$[]3], [yes])],
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[AS_VAR_SET([$[]3], [no])])])
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AS_LINENO_POP
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])# _AC_CHECK_DECL_BODY
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# _AC_CHECK_DECLS(SYMBOL, ACTION-IF_FOUND, ACTION-IF-NOT-FOUND,
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# INCLUDES)
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# -------------------------------------------------------------
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# Helper to AC_CHECK_DECLS, which generates the check for a single
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# SYMBOL with INCLUDES, performs the AC_DEFINE, then expands
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# ACTION-IF-FOUND or ACTION-IF-NOT-FOUND.
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m4_define([_AC_CHECK_DECLS],
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[AC_CHECK_DECL([$1], [ac_have_decl=1], [ac_have_decl=0], [$4])]dnl
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[AC_DEFINE_UNQUOTED(AS_TR_CPP(m4_bpatsubst(HAVE_DECL_[$1],[ *(.*])),
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[$ac_have_decl],
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[Define to 1 if you have the declaration of `$1',
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and to 0 if you don't.])]dnl
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[m4_ifvaln([$2$3], [AS_IF([test $ac_have_decl = 1], [$2], [$3])])])
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])
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dnl If flex/lex are not found, the top level configure sets LEX to
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dnl "/path_to/missing flex". When AC_PROG_LEX tries to find the flex
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dnl output file, it calls $LEX to do so, but the current lightweight
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dnl "missing" won't create a file. This results in an error.
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dnl Avoid calling the bulk of AC_PROG_LEX when $LEX is "missing".
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AC_DEFUN_ONCE([AC_PROG_LEX],
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[AC_CHECK_PROGS(LEX, flex lex, :)
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case "$LEX" in
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:|*"missing "*) ;;
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*) _AC_PROG_LEX_YYTEXT_DECL ;;
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esac])
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])
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