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8b6e6bf04f
Separate out function and function pointer attributes, as not all versions of all compilers support both. Have macros related to function attributes auto-generated by autoheader. As a result, rename config.h.in to unconfig.h, to make it more obvious that it is really intended to be included from some C programs. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
90 lines
3.4 KiB
Plaintext
90 lines
3.4 KiB
Plaintext
dnl --------------------------------------------------------------------------
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dnl PA_FUNC_ATTRIBUTE(attribute_name)
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dnl
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dnl See if this compiler supports the equivalent of a specific gcc
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dnl attribute on a function, using the __attribute__(()) syntax.
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dnl All arguments except the attribute name are optional.
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dnl
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dnl PA_FUNC_ATTRIBUTE(attribute, attribute_opts, return_type,
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dnl prototype_args, call_args, altname)
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dnl
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dnl This tests the attribute both on a function pointer and on a
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dnl direct function, as some gcc [and others?] versions have problems
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dnl with attributes on function pointers, and we might as well check both.
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dnl --------------------------------------------------------------------------
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AC_DEFUN([_PA_FUNC_ATTRIBUTE],
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[AC_MSG_CHECKING([if $CC supports the $1 function attribute])
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m4_define([_pa_faa],ifelse([$2],[],[],[($2)]))
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m4_define([_pa_fam],ifelse([$2],[],[],[(m4_join([,],m4_for(_pa_n,1,m4_count($2),1,[m4_quote([x]_pa_n),])))]))
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m4_define([_pa_suf],ifelse([$2],[],[],[m4_count($2)]))
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m4_define([_pa_mac],ifelse([$6],[],[$1_func]_pa_suf,[$6]))
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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AC_INCLUDES_DEFAULT
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extern ifelse([$3],[],[void *],[$3]) __attribute__(([$1]_pa_faa))
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bar(ifelse([$4],[],[int],[$4]));
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ifelse([$3],[],[void *],[$3]) foo(void);
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ifelse([$3],[],[void *],[$3]) foo(void)
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{
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ifelse([$3],[void],[],[return])
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bar(ifelse([$5],[],[1],[$5]));
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}
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])],
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[AC_MSG_RESULT([yes])
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AC_DEFINE(PA_SYM([HAVE_FUNC_ATTRIBUTE],_pa_suf,[_$1]), 1,
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[Define to 1 if your compiler supports __attribute__(($1)) on functions])],
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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,[
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# ifdef ],PA_SYM([HAVE_FUNC_ATTRIBUTE],_pa_suf,[_$1]),[
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# define ],_pa_mac,m4_quote(_pa_fam),[ __attribute__(($1],m4_quote(_pa_fam),[))
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# else
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# define ],_pa_mac,m4_quote(_pa_fam),[
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# endif
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#endif])))
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])
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AC_DEFUN([_PA_FUNC_PTR_ATTRIBUTE],
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[AC_MSG_CHECKING([if $CC supports the $1 function attribute on pointers])
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m4_define([_pa_faa],ifelse([$2],[],[],[($2)]))
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m4_define([_pa_fam],ifelse([$2],[],[],[(m4_join([,],m4_for(_pa_n,1,m4_count($2),1,[m4_quote([x]_pa_n),])))]))
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m4_define([_pa_suf],ifelse([$2],[],[],[m4_count($2)]))
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m4_define([_pa_mac],ifelse([$6],[],[$1_func]_pa_suf,[$6])_ptr)
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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AC_INCLUDES_DEFAULT
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extern ifelse([$3],[],[void *],[$3]) __attribute__(([$1]_pa_faa))
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(*bar1)(ifelse([$4],[],[int],[$4]));
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ifelse([$3],[],[void *],[$3]) foo1(void);
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ifelse([$3],[],[void *],[$3]) foo1(void)
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{
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ifelse([$3],[void],[],[return])
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bar1(ifelse([$5],[],[1],[$5]));
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}
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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);
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ifelse([$3],[],[void *],[$3]) foo2(void)
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{
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ifelse([$3],[void],[],[return])
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bar2(ifelse([$5],[],[1],[$5]));
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}
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])],
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[AC_MSG_RESULT([yes])
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AC_DEFINE(PA_SYM([HAVE_FUNC_PTR_ATTRIBUTE],_pa_suf,[_$1]), 1,
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[Define to 1 if your compiler supports __attribute__(($1)) on function pointers])],
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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,[
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# ifdef ],PA_SYM([HAVE_FUNC_PTR_ATTRIBUTE],_pa_suf,[_$1]),[
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# define ],_pa_mac,m4_quote(_pa_fam),[ __attribute__(($1],m4_quote(_pa_fam),[))
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# else
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# define ],_pa_mac,m4_quote(_pa_fam),[
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# endif
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#endif])))
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])
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AC_DEFUN([PA_FUNC_ATTRIBUTE],
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[_PA_FUNC_ATTRIBUTE([$1],[$2],[$3],[$4],[$5],[$6])
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_PA_FUNC_PTR_ATTRIBUTE([$1],[$2],[$3],[$4],[$5],[$6])])
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