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978c7b2e89
The rewrite of BIND 9 build system is a large work and cannot be reasonable split into separate merge requests. Addition of the automake has a positive effect on the readability and maintainability of the build system as it is more declarative, it allows conditional and we are able to drop all of the custom make code that BIND 9 developed over the years to overcome the deficiencies of autoconf + custom Makefile.in files. This squashed commit contains following changes: - conversion (or rather fresh rewrite) of all Makefile.in files to Makefile.am by using automake - the libtool is now properly integrated with automake (the way we used it was rather hackish as the only official way how to use libtool is via automake - the dynamic module loading was rewritten from a custom patchwork to libtool's libltdl (which includes the patchwork to support module loading on different systems internally) - conversion of the unit test executor from kyua to automake parallel driver - conversion of the system test executor from custom make/shell to automake parallel driver - The GSSAPI has been refactored, the custom SPNEGO on the basis that all major KRB5/GSSAPI (mit-krb5, heimdal and Windows) implementations support SPNEGO mechanism. - The various defunct tests from bin/tests have been removed: bin/tests/optional and bin/tests/pkcs11 - The text files generated from the MD files have been removed, the MarkDown has been designed to be readable by both humans and computers - The xsl header is now generated by a simple sed command instead of perl helper - The <irs/platform.h> header has been removed - cleanups of configure.ac script to make it more simpler, addition of multiple macros (there's still work to be done though) - the tarball can now be prepared with `make dist` - the system tests are partially able to run in oot build Here's a list of unfinished work that needs to be completed in subsequent merge requests: - `make distcheck` doesn't yet work (because of system tests oot run is not yet finished) - documentation is not yet built, there's a different merge request with docbook to sphinx-build rst conversion that needs to be rebased and adapted on top of the automake - msvc build is non functional yet and we need to decide whether we will just cross-compile bind9 using mingw-w64 or fix the msvc build - contributed dlz modules are not included neither in the autoconf nor automake
242 lines
8.3 KiB
Text
242 lines
8.3 KiB
Text
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_GCC_FUNC_ATTRIBUTE(ATTRIBUTE)
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#
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# DESCRIPTION
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#
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# This macro checks if the compiler supports one of GCC's function
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# attributes; many other compilers also provide function attributes with
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# the same syntax. Compiler warnings are used to detect supported
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# attributes as unsupported ones are ignored by default so quieting
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# warnings when using this macro will yield false positives.
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#
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# The ATTRIBUTE parameter holds the name of the attribute to be checked.
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#
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# If ATTRIBUTE is supported define HAVE_FUNC_ATTRIBUTE_<ATTRIBUTE>.
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#
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# The macro caches its result in the ax_cv_have_func_attribute_<attribute>
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# variable.
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#
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# The macro currently supports the following function attributes:
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#
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# alias
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# aligned
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# alloc_size
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# always_inline
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# artificial
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# cold
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# const
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# constructor
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# constructor_priority for constructor attribute with priority
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# deprecated
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# destructor
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# dllexport
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# dllimport
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# error
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# externally_visible
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# fallthrough
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# flatten
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# format
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# format_arg
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# gnu_format
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# gnu_inline
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# hot
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# ifunc
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# leaf
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# malloc
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# noclone
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# noinline
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# nonnull
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# noreturn
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# nothrow
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# optimize
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# pure
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# sentinel
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# sentinel_position
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# unused
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# used
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# visibility
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# warning
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# warn_unused_result
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# weak
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# weakref
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#
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# Unsupported function attributes will be tested with a prototype
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# returning an int and not accepting any arguments and the result of the
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# check might be wrong or meaningless so use with care.
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#
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# LICENSE
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#
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# Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 10
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AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
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AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1])
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AC_CACHE_CHECK([for __attribute__(($1))], [ac_var], [
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AC_LINK_IFELSE([AC_LANG_PROGRAM([
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m4_case([$1],
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[alias], [
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int foo( void ) { return 0; }
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int bar( void ) __attribute__(($1("foo")));
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],
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[aligned], [
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int foo( void ) __attribute__(($1(32)));
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],
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[alloc_size], [
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void *foo(int a) __attribute__(($1(1)));
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],
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[always_inline], [
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inline __attribute__(($1)) int foo( void ) { return 0; }
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],
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[artificial], [
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inline __attribute__(($1)) int foo( void ) { return 0; }
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],
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[cold], [
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int foo( void ) __attribute__(($1));
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],
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[const], [
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int foo( void ) __attribute__(($1));
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],
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[constructor_priority], [
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int foo( void ) __attribute__((__constructor__(65535/2)));
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],
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[constructor], [
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int foo( void ) __attribute__(($1));
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],
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[deprecated], [
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int foo( void ) __attribute__(($1("")));
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],
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[destructor], [
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int foo( void ) __attribute__(($1));
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],
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[dllexport], [
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__attribute__(($1)) int foo( void ) { return 0; }
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],
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[dllimport], [
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int foo( void ) __attribute__(($1));
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],
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[error], [
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int foo( void ) __attribute__(($1("")));
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],
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[externally_visible], [
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int foo( void ) __attribute__(($1));
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],
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[fallthrough], [
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int foo( void ) {switch (0) { case 1: __attribute__(($1)); case 2: break ; }};
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],
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[flatten], [
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int foo( void ) __attribute__(($1));
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],
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[format], [
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int foo(const char *p, ...) __attribute__(($1(printf, 1, 2)));
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],
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[gnu_format], [
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int foo(const char *p, ...) __attribute__((format(gnu_printf, 1, 2)));
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],
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[format_arg], [
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char *foo(const char *p) __attribute__(($1(1)));
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],
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[gnu_inline], [
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inline __attribute__(($1)) int foo( void ) { return 0; }
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],
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[hot], [
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int foo( void ) __attribute__(($1));
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],
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[ifunc], [
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int my_foo( void ) { return 0; }
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static int (*resolve_foo(void))(void) { return my_foo; }
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int foo( void ) __attribute__(($1("resolve_foo")));
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],
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[leaf], [
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__attribute__(($1)) int foo( void ) { return 0; }
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],
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[malloc], [
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void *foo( void ) __attribute__(($1));
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],
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[noclone], [
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int foo( void ) __attribute__(($1));
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],
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[noinline], [
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__attribute__(($1)) int foo( void ) { return 0; }
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],
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[nonnull], [
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int foo(char *p) __attribute__(($1(1)));
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],
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[noreturn], [
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void foo( void ) __attribute__(($1));
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],
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[nothrow], [
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int foo( void ) __attribute__(($1));
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],
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[optimize], [
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__attribute__(($1(3))) int foo( void ) { return 0; }
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],
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[pure], [
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int foo( void ) __attribute__(($1));
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],
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[sentinel], [
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int foo(void *p, ...) __attribute__(($1));
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],
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[sentinel_position], [
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int foo(void *p, ...) __attribute__(($1(1)));
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],
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[returns_nonnull], [
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void *foo( void ) __attribute__(($1));
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],
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[unused], [
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int foo( void ) __attribute__(($1));
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],
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[used], [
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int foo( void ) __attribute__(($1));
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],
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[visibility], [
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int foo_def( void ) __attribute__(($1("default")));
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int foo_hid( void ) __attribute__(($1("hidden")));
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int foo_int( void ) __attribute__(($1("internal")));
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int foo_pro( void ) __attribute__(($1("protected")));
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],
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[warning], [
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int foo( void ) __attribute__(($1("")));
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],
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[warn_unused_result], [
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int foo( void ) __attribute__(($1));
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],
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[weak], [
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int foo( void ) __attribute__(($1));
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],
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[weakref], [
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static int foo( void ) { return 0; }
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static int bar( void ) __attribute__(($1("foo")));
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],
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[
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m4_warn([syntax], [Unsupported attribute $1, the test may fail])
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int foo( void ) __attribute__(($1));
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]
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)], [])
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],
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dnl GCC doesn't exit with an error if an unknown attribute is
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dnl provided but only outputs a warning, so accept the attribute
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dnl only if no warning were issued.
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[AS_IF([test -s conftest.err],
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[AS_VAR_SET([ac_var], [no])],
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[AS_VAR_SET([ac_var], [yes])])],
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[AS_VAR_SET([ac_var], [no])])
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])
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AS_IF([test yes = AS_VAR_GET([ac_var])],
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[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_FUNC_ATTRIBUTE_$1), 1,
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[Define to 1 if the system has the `$1' function attribute])], [])
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AS_VAR_POPDEF([ac_var])
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])
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