27854e67ac
Add defines for added CFLAGS. This can be useful, for example, for LTO or sanitizers being enabled. Various cleanups for readability and documentation; use macros available in current autoconf. Add new utility function PA_SYM(), similar to AS_TR_CPP() except collapses sequential underscores. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
167 lines
6 KiB
Text
167 lines
6 KiB
Text
dnl --------------------------------------------------------------------------
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dnl PA_SYM(prefix, string)
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dnl
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dnl Convert a (semi-) arbitrary string to a CPP symbol
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dnl --------------------------------------------------------------------------
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AC_DEFUN(PA_SYM,
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[[$1]m4_bpatsubsts(m4_toupper([$2]),[[^ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]+],[_],[^._?\(.*\)_.$],[[\1]])])
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dnl --------------------------------------------------------------------------
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dnl PA_ADD_CFLAGS(flag [,actual_flag])
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dnl
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dnl Attempt to add the given option to CFLAGS, if it doesn't break
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dnl compilation. If the option to be tested is different than the
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dnl option that should actually be added, add the option to be
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dnl actually added as a second argument.
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dnl --------------------------------------------------------------------------
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AC_DEFUN(PA_ADD_CFLAGS,
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[AC_MSG_CHECKING([if $CC accepts $1])
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pa_add_cflags__old_cflags="$CFLAGS"
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CFLAGS="$CFLAGS $1"
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AC_TRY_LINK(AC_INCLUDES_DEFAULT,
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[printf("Hello, World!\n");],
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[AC_MSG_RESULT([yes])
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CFLAGS="$pa_add_cflags__old_cflags ifelse([$2],[],[$1],[$2])"
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AC_DEFINE(PA_SYM([CFLAG_],[$1]), 1,
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[Define to 1 if compiled with the `$1' compiler flag])],
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[AC_MSG_RESULT([no])
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CFLAGS="$pa_add_cflags__old_cflags"])])
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dnl --------------------------------------------------------------------------
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dnl PA_ADD_CLDFLAGS(flag [,actual_flag])
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dnl
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dnl Attempt to add the given option to CFLAGS and LDFLAGS,
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dnl if it doesn't break compilation
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dnl --------------------------------------------------------------------------
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AC_DEFUN(PA_ADD_CLDFLAGS,
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[AC_MSG_CHECKING([if $CC accepts $1])
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pa_add_cldflags__old_cflags="$CFLAGS"
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CFLAGS="$CFLAGS $1"
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pa_add_cldflags__old_ldflags="$LDFLAGS"
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LDFLAGS="$LDFLAGS $1"
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AC_TRY_LINK(AC_INCLUDES_DEFAULT,
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[printf("Hello, World!\n");],
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[AC_MSG_RESULT([yes])
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CFLAGS="$pa_add_cldflags__old_cflags ifelse([$2],[],[$1],[$2])"
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LDFLAGS="$pa_add_cldflags__old_ldflags ifelse([$2],[],[$1],[$2])"
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AC_DEFINE(PA_SYM([CFLAG_],[$1]), 1,
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[Define to 1 if compiled with the `$1' compiler flag])],
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[AC_MSG_RESULT([no])
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CFLAGS="$pa_add_cldflags__old_cflags"
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LDFLAGS="$pa_add_cldflags__old_ldflags"])])
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dnl --------------------------------------------------------------------------
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dnl PA_HAVE_FUNC(func_name)
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dnl
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dnl Look for a function with the specified arguments which could be
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dnl a builtin/intrinsic function.
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dnl --------------------------------------------------------------------------
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AC_DEFUN(PA_HAVE_FUNC,
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[AC_MSG_CHECKING([for $1])
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AC_TRY_LINK([], [(void)$1$2;],
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AC_MSG_RESULT([yes])
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AC_DEFINE(AS_TR_CPP([HAVE_$1]), 1,
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[Define to 1 if you have the `$1' intrinsic function.]),
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AC_MSG_RESULT([no]))])
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dnl --------------------------------------------------------------------------
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dnl PA_LIBEXT
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dnl
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dnl Guess the library extension based on the object extension
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dnl --------------------------------------------------------------------------
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AC_DEFUN(PA_LIBEXT,
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[AC_MSG_CHECKING([for suffix of library files])
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if test x"$LIBEXT" = x; then
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case "$OBJEXT" in
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obj )
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LIBEXT=lib
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;;
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*)
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LIBEXT=a
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;;
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esac
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fi
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AC_MSG_RESULT([$LIBEXT])
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AC_SUBST([LIBEXT])])
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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 PA_FUNC_ATTRIBUTE(attribute, attribute_opts, return_type,
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dnl prototype_args, call_args)
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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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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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AC_INCLUDES_DEFAULT
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extern ifelse([$3],[],[void *],[$3]) __attribute__(($1$2))
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bar(ifelse([$4],[],[int],[$4]));
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void *foo(void);
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void *foo(void)
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{
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return 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_],[$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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])
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dnl --------------------------------------------------------------------------
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dnl PA_FUNC_ATTRIBUTE_ERROR
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dnl
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dnl See if this compiler supports __attribute__((error("foo")))
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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 --------------------------------------------------------------------------
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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([
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AC_INCLUDES_DEFAULT
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extern void __attribute__((error("message"))) barf(void);
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void foo(void);
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void foo(void)
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{
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if (0)
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barf();
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}
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])],
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[AC_MSG_RESULT([yes])
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AC_DEFINE([HAVE_FUNC_ATTRIBUTE_ERROR], 1,
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[Define to 1 if your compiler supports __attribute__((error)) on functions])],
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[AC_MSG_RESULT([no])])
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])
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dnl --------------------------------------------------------------------------
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dnl PA_ARG_ENABLED(option, helptext [,enabled_action [,disabled_action]])
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dnl PA_ARG_DISABLED(option, helptext [,disabled_action [,enabled_action]])
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dnl
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dnl Simpler-to-use versions of AC_ARG_ENABLED, that include the
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dnl test for $enableval and the AS_HELP_STRING definition
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dnl --------------------------------------------------------------------------
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AC_DEFUN(PA_ARG_ENABLED,
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[AC_ARG_ENABLE([$1], [AS_HELP_STRING([--enable-$1],[$2])], [], [enableval=no])
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AS_IF([test x"$enableval" != xno], [$3], [$4])
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])
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AC_DEFUN(PA_ARG_DISABLED,
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[AC_ARG_ENABLE([$1],[AS_HELP_STRING([--disable-$1],[$2])], [], [enableval=yes])
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AS_IF([test x"$enableval" = xno], [$3], [$4])
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])
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dnl --------------------------------------------------------------------------
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dnl PA_ADD_HEADERS(headers...)
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dnl
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dnl Call AC_CHECK_HEADERS(), and add to ac_includes_default if found
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dnl --------------------------------------------------------------------------
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AC_DEFUN(_PA_ADD_HEADER,
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[AC_CHECK_HEADERS([$1],[ac_includes_default="$ac_includes_default
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#include <$1>"dnl
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])])
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AC_DEFUN(PA_ADD_HEADERS,
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[m4_map_args_w([$1],[_PA_ADD_HEADER(],[)])])
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