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H. Peter Anvin
committed
autoconf: modernize autoconf and update a lot of m4 macros
1 parent a916e41 commit a16a45e

18 files changed

+261
-117
lines changed

‎.gitignore

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@@ -108,3 +108,4 @@ TAGS
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/autoconf/compile
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/autoconf/config.*
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/autoconf/install-sh
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/autoconf/clean.sh

‎autoconf/attribute.h

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/*
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* Define a macro for compiler attributes. Use either gcc
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* syntax if __GNUC__ is defined, or try to look for the
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* modern standard [[x]] attributes.
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*
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* Unfortunately [[x]] doesn't always work when it comes to
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* GNUC-specific attributes, and some compilers support GCC
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* syntax without __attribute__ just to be confusing.
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* Therefore, this also needs an autoconf module to test
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* the validity.
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*
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* Use #ifdef and not defined() here; some compilers do the wrong
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* thing in the latter case.
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*/
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#ifndef ATTRIBUTE
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# define MODERN_ATTRIBUTE(x) [[x]]
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# ifndef __GNUC__
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# ifdef __cplusplus
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# ifdef __has_cpp_attribute
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# define ATTRIBUTE(x) MODERN_ATTRIBUTE(x)
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# endif
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# endif
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# ifndef ATTRIBUTE
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# ifdef __has_c_attribute
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# define ATTRIBUTE(x) MODERN_ATTRIBUTE(x)
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# endif
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# endif
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# ifndef ATTRIBUTE
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# ifdef __has_attribute
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# define ATTRIBUTE(x) MODERN_ATTRIBUTE(x)
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# endif
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# endif
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# endif
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# ifndef ATTRIBUTE
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# define ATTRIBUTE(x) __attribute__((x))
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# endif
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#endif

‎autoconf/m4/pa_add_langflags.m4

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dnl --------------------------------------------------------------------------
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dnl PA_ADD_LANGFLAGS(flag...)
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dnl
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dnl Attempt to add the option in the given list to each compiler flags
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dnl (CFLAGS, CXXFLAGS, ...), if it doesn't break compilation.
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dnl --------------------------------------------------------------------------
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m4_defun([_PA_LANGFLAG_VAR],
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[m4_case([$1],
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[C], [CFLAGS],
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[C++], [CXXFLAGS],
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[Fortran 77], [FFLAGS],
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[Fortran], [FCFLAGS],
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[Erlang], [ERLCFLAGS],
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[Objective C], [OBJCFLAGS],
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[Objective C++], [OBJCXXFLAGS],
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[Go], [GOFLAGS],
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[m4_fatal([PA_ADD_LANGFLAGS: Unknown language: $1])])])
18+
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AC_DEFUN([PA_ADD_LANGFLAGS],
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[m4_set_foreach(PA_LANG_SEEN_SET, [lang],
21+
[_pa_flag_found=no
22+
m4_foreach_w([flag], [$1],
23+
[AS_IF([test $_pa_flag_found = no],
24+
[PA_ADD_FLAGS(_PA_LANGFLAG_VAR(lang),flag,[],[_pa_flag_found=yes])])
25+
])])])

‎autoconf/m4/pa_attribute_syntax.m4

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dnl --------------------------------------------------------------------------
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dnl PA_ATTRIBUTE_SYNTAX
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dnl
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dnl Source code fragment to test for attribute syntax
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dnl The use of #ifdef rather than defined() here is intentional:
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dnl defined() is known to not always work right.
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8+
dnl --------------------------------------------------------------------------
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AC_DEFUN([PA_ATTRIBUTE_SYNTAX],
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[#include "autoconf/attribute.h"
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])

‎autoconf/m4/pa_common_attributes.m4

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dnl --------------------------------------------------------------------------
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dnl PA_COMMON_ATTRIBUTES
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dnl
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dnl Test for a bunch of common function attributes and define macros for them.
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dnl --------------------------------------------------------------------------
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AC_DEFUN([PA_COMMON_ATTRIBUTES],
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[PA_ADD_CPPFLAGS([-Werror=attributes])
8+
PA_FUNC_ATTRIBUTE(noreturn)
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PA_FUNC_ATTRIBUTE(returns_nonnull,,[void *],,,never_null)
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PA_FUNC_ATTRIBUTE(malloc,,[void *])
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PA_FUNC_ATTRIBUTE(alloc_size,[1],[void *],[int],[80])
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PA_FUNC_ATTRIBUTE(alloc_size,[1,2],[void *],[int,int],[20,40])
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PA_FUNC_ATTRIBUTE(sentinel,,,[const char *, ...],["a","b",NULL],end_with_null)
14+
PA_FUNC_ATTRIBUTE(format,[printf,1,2],int,[const char *, ...],["%d",1])
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PA_FUNC_ATTRIBUTE(const)
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PA_FUNC_ATTRIBUTE(pure)
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PA_FUNC_ATTRIBUTE(cold,,,,,unlikely_func)
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PA_FUNC_ATTRIBUTE(unused)
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PA_FUNC_ATTRIBUTE_ERROR])

‎autoconf/m4/pa_endian.m4

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dnl --------------------------------------------------------------------------
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dnl PA_ENDIAN
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dnl
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dnl Test for a bunch of variants of endian tests and byteorder functions.
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dnl --------------------------------------------------------------------------
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AC_DEFUN([PA_ENDIAN],
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[AC_C_BIGENDIAN(AC_DEFINE(WORDS_BIGENDIAN),AC_DEFINE(WORDS_LITTLEENDIAN),,)
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AH_TEMPLATE(WORDS_BIGENDIAN,
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[Define to 1 if your processor stores words with the most significant
10+
byte first (like Motorola and SPARC, unlike Intel and VAX).])
11+
AH_TEMPLATE(WORDS_LITTLEENDIAN,
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[Define to 1 if your processor stores words with the least significant
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byte first (like Intel and VAX, unlike Motorola and SPARC).])
14+
PA_ADD_HEADERS(endian.h sys/endian.h machine/endian.h)
15+
PA_HAVE_FUNC(cpu_to_le16, (0))
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PA_HAVE_FUNC(cpu_to_le32, (0))
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PA_HAVE_FUNC(cpu_to_le64, (0))
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PA_HAVE_FUNC(__cpu_to_le16, (0))
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PA_HAVE_FUNC(__cpu_to_le32, (0))
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PA_HAVE_FUNC(__cpu_to_le64, (0))
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PA_HAVE_FUNC(htole16, (0))
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PA_HAVE_FUNC(htole32, (0))
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PA_HAVE_FUNC(htole64, (0))
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PA_HAVE_FUNC(__bswap_16, (0))
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PA_HAVE_FUNC(__bswap_32, (0))
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PA_HAVE_FUNC(__bswap_64, (0))
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PA_HAVE_FUNC(__builtin_bswap16, (0))
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PA_HAVE_FUNC(__builtin_bswap32, (0))
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PA_HAVE_FUNC(__builtin_bswap64, (0))
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PA_HAVE_FUNC(_byteswap_ushort, (0))
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PA_HAVE_FUNC(_byteswap_ulong, (0))
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PA_HAVE_FUNC(_byteswap_uint64, (0))])

‎autoconf/m4/pa_func_attribute.m4

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@@ -20,7 +20,9 @@ AC_DEFUN([_PA_FUNC_ATTRIBUTE],
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AC_MSG_CHECKING([if $CC supports the $1]_pa_faa[ function attribute])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
2222
AC_INCLUDES_DEFAULT
23-
extern ifelse([$3],[],[void *],[$3]) __attribute__(([$1]_pa_faa))
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PA_ATTRIBUTE_SYNTAX
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25+
extern ifelse([$3],[],[void *],[$3]) ATTRIBUTE([$1]_pa_faa)
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bar(ifelse([$4],[],[int],[$4]));
2527
ifelse([$3],[],[void *],[$3]) foo(void);
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ifelse([$3],[],[void *],[$3]) foo(void)
@@ -31,12 +33,12 @@ ifelse([$3],[],[void *],[$3]) foo(void)
3133
])],
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[AC_MSG_RESULT([yes])
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AC_DEFINE(PA_SYM([HAVE_FUNC_ATTRIBUTE],_pa_suf,[_$1]), 1,
34-
[Define to 1 if your compiler supports __attribute__(($1)) on functions])],
36+
[Define to 1 if your compiler supports the $1 function attribute])],
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[AC_MSG_RESULT([no])])
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AH_BOTTOM(m4_quote(m4_join([],
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[#ifndef ],_pa_mac,[
3840
# ifdef ],PA_SYM([HAVE_FUNC_ATTRIBUTE],_pa_suf,[_$1]),[
39-
# define ],_pa_mac,m4_quote(_pa_fam),[ __attribute__(($1],m4_quote(_pa_fam),[))
41+
# define ],_pa_mac,m4_quote(_pa_fam),[ ATTRIBUTE($1],m4_quote(_pa_fam),[)
4042
# else
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# define ],_pa_mac,m4_quote(_pa_fam),[
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# endif
@@ -51,7 +53,9 @@ AC_DEFUN([_PA_FUNC_PTR_ATTRIBUTE],
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AC_MSG_CHECKING([if $CC supports the $1]_pa_faa[ function attribute on pointers])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
5355
AC_INCLUDES_DEFAULT
54-
extern ifelse([$3],[],[void *],[$3]) __attribute__(([$1]_pa_faa))
56+
PA_ATTRIBUTE_SYNTAX
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58+
extern ifelse([$3],[],[void *],[$3]) ATTRIBUTE([$1]_pa_faa)
5559
(*bar1)(ifelse([$4],[],[int],[$4]));
5660
ifelse([$3],[],[void *],[$3]) foo1(void);
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ifelse([$3],[],[void *],[$3]) foo1(void)
@@ -60,7 +64,7 @@ ifelse([$3],[],[void *],[$3]) foo1(void)
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bar1(ifelse([$5],[],[1],[$5]));
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}
6266
63-
typedef ifelse([$3],[],[void *],[$3]) __attribute__(([$1]_pa_faa))
67+
typedef ifelse([$3],[],[void *],[$3]) ATTRIBUTE([$1]_pa_faa)
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(*bar_t)(ifelse([$4],[],[int],[$4]));
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extern bar_t bar2;
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ifelse([$3],[],[void *],[$3]) foo2(void);
@@ -72,12 +76,12 @@ ifelse([$3],[],[void *],[$3]) foo2(void)
7276
])],
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[AC_MSG_RESULT([yes])
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AC_DEFINE(PA_SYM([HAVE_FUNC_PTR_ATTRIBUTE],_pa_suf,[_$1]), 1,
75-
[Define to 1 if your compiler supports __attribute__(($1)) on function pointers])],
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[Define to 1 if your compiler supports the $1 attribute on function pointers])],
7680
[AC_MSG_RESULT([no])])
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AH_BOTTOM(m4_quote(m4_join([],
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[#ifndef ],_pa_mac,[
7983
# ifdef ],PA_SYM([HAVE_FUNC_PTR_ATTRIBUTE],_pa_suf,[_$1]),[
80-
# define ],_pa_mac,m4_quote(_pa_fam),[ __attribute__(($1],m4_quote(_pa_fam),[))
84+
# define ],_pa_mac,m4_quote(_pa_fam),[ ATTRIBUTE($1],m4_quote(_pa_fam),[)
8185
# else
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# define ],_pa_mac,m4_quote(_pa_fam),[
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# endif

‎autoconf/m4/pa_func_attribute_error.m4

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@@ -1,7 +1,9 @@
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dnl --------------------------------------------------------------------------
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dnl PA_FUNC_ATTRIBUTE_ERROR
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dnl
4-
dnl See if this compiler supports __attribute__((error("foo")))
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dnl See if this compiler supports __attribute__((error("foo"))) *and*
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dnl does *not* error if the erroneous call is unreachable.
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dnl
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dnl The generic version of this doesn't work as it makes the compiler
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dnl throw an error by design.
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dnl
@@ -12,7 +14,9 @@ AC_DEFUN([PA_FUNC_ATTRIBUTE_ERROR],
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[AC_MSG_CHECKING([if $CC supports the error function attribute])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1416
AC_INCLUDES_DEFAULT
15-
extern void __attribute__((error("message"))) barf(void);
17+
PA_ATTRIBUTE_SYNTAX
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19+
extern ATTRIBUTE(error("message")) void barf(void);
1620
void foo(void);
1721
void foo(void)
1822
{
@@ -22,6 +26,6 @@ void foo(void)
2226
])],
2327
[AC_MSG_RESULT([yes])
2428
AC_DEFINE([HAVE_FUNC_ATTRIBUTE_ERROR], 1,
25-
[Define to 1 if your compiler supports __attribute__((error)) on functions])],
29+
[Define to 1 if your compiler supports the error attribute on functions])],
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[AC_MSG_RESULT([no])])
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])

‎autoconf/m4/pa_option_debug.m4

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dnl --------------------------------------------------------------------------
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dnl PA_OPTION_DEBUG(with_debug, without_debug)
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dnl
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dnl Set debug flags and optimization flags depending on if
5+
dnl --enable-debug is set or not. Some flags are set regardless...
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dnl --------------------------------------------------------------------------
7+
AC_DEFUN([PA_OPTION_DEBUG],
8+
[PA_ARG_DISABLED([gdb], [disable gdb debug extensions],
9+
[PA_ADD_LANGFLAGS([-g3])], [PA_ADD_LANGFLAGS([-ggdb3 -g3])])
10+
PA_ARG_ENABLED([debug], [optimize for debugging],
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[PA_ADD_LANGFLAGS([-Og -O0])
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$1],
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[$2])])

‎autoconf/m4/pa_option_gc.m4

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dnl --------------------------------------------------------------------------
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dnl PA_OPTION_GC
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dnl
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dnl Option to compile with garbage collection; currently only supports
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dnl gcc/ELF. Enabled by default.
6+
dnl --------------------------------------------------------------------------
7+
AC_DEFUN([PA_OPTION_GC],
8+
[PA_ARG_DISABLED([gc],
9+
[do not compile with dead code garbage collection support],
10+
[],
11+
[PA_ADD_LDFLAGS([-Wl,--as-needed])
12+
PA_ADD_CFLAGS([-ffunction-sections])
13+
PA_ADD_CFLAGS([-fdata-sections])
14+
PA_ADD_LDFLAGS([-Wl,--gc-sections])])])

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