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https://github.com/netwide-assembler/nasm.git
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0da1549b73
AC_ARG_ENABLE() doesn't really work the way you expect: one argument is called on *any* invocation. Create simple helper wrappers to get the effect we really want for boolean options. Define WINELOADER=/dev/null to prevent autoconf from inadvertently running Wine and think we are not cross-compiling even if we are. It is at the very best slow and buys us absolutely nothing. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
142 lines
4.7 KiB
Plaintext
142 lines
4.7 KiB
Plaintext
dnl --------------------------------------------------------------------------
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dnl PA_ADD_CFLAGS()
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dnl
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dnl Attempt to add the given option to CFLAGS, if it doesn't break compilation
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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 $1"
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AC_TRY_LINK([#include <stdio.h>],
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[printf("Hello, World!\n");],
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AC_MSG_RESULT([yes])
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CFLAGS="$pa_add_cflags__old_cflags ifelse([$2],[],[$1],[$2])",
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AC_MSG_RESULT([no])
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CFLAGS="$pa_add_cflags__old_cflags")])
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dnl --------------------------------------------------------------------------
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dnl PA_ADD_CLDFLAGS()
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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 $1"
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AC_TRY_LINK([#include <stdio.h>],
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[printf("Hello, World!\n");],
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AC_MSG_RESULT([yes])
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CFLAGS="$pa_add_cldflags__old_cflags ifelse([$2],[],[$1],[$2])"
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LDFLAGS="$pa_add_cldflags__old_ldflags ifelse([$2],[],[$1],[$2])",
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AC_MSG_RESULT([no])
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CFLAGS="$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
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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(m4_toupper([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
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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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#include <stdarg.h>
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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(m4_toupper([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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#include <stdarg.h>
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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(m4_toupper([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
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dnl PA_ARG_DISABLED
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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],
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[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],
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[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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