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dnl Macros for checking if various gcc compiler attributes are present
dnl
dnl Written by Shane Alcock <salcock@waikato.ac.nz>, but some credit
dnl should be given to Diego Pettenò <flameeyes@gmail.com> whose
dnl macros were very useful in helping me figure out how to write my
dnl own.
dnl
dnl
AC_DEFUN([check_WERROR],
[
AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK(
[if -Werror flag is supported by compiler],
[lt_cv_werror_flag],
[saved="$CFLAGS"
CFLAGS="$CFLAGS -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([int a;])],
[eval lt_cv_werror_flag='yes'],
[eval lt_cv_werror_flag='no'])
CFLAGS="$saved"
])
])
AC_DEFUN([gcc_PACKED],
[
AC_REQUIRE([check_WERROR])
HAVE_ATTRIBUTE_PACKED=0
if test -n "$CC"; then
AS_IF([eval test x$lt_cv_werror_flag = xyes], [errflag=-Werror], [])
AC_CACHE_CHECK([if compiler supports __attribute__((packed))],
[lt_cv_attribute_packed],
[saved="$CFLAGS"
CFLAGS="$CFLAGS $errflag"
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[struct s { char a; char b; int val; long val2; void *ptr;} __attribute__((packed));])],
[lt_cv_attribute_packed=yes],
[lt_cv_attribute_packed=no]
)
CFLAGS="$saved"
])
if test x$lt_cv_attribute_packed = xyes; then
HAVE_ATTRIBUTE_PACKED=1
fi
fi
AC_SUBST([HAVE_ATTRIBUTE_PACKED])
AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_PACKED], [$HAVE_ATTRIBUTE_PACKED],
[Define to 1 or 0, depending on whether the compiler supports the gcc packed attribute.])
])
AC_DEFUN([gcc_UNUSED],
[
AC_REQUIRE([check_WERROR])
HAVE_ATTRIBUTE_UNUSED=0
if test -n "$CC"; then
AS_IF([eval test x$lt_cv_werror_flag = xyes], [errflag=-Werror], [])
AC_CACHE_CHECK([if compiler supports __attribute__((unused))],
[lt_cv_attribute_unused],
[saved="$CFLAGS"
CFLAGS="$CFLAGS $errflag"
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[void func(int a, __attribute__((unused)) int b);])],
[lt_cv_attribute_unused=yes],
[lt_cv_attribute_unused=no]
)
CFLAGS="$saved"
])
if test x$lt_cv_attribute_unused = xyes; then
HAVE_ATTRIBUTE_UNUSED=1
fi
fi
AC_SUBST([HAVE_ATTRIBUTE_UNUSED])
AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_UNUSED], [$HAVE_ATTRIBUTE_UNUSED],
[Define to 1 or 0, depending on whether the compiler supports the gcc unused attribute.])
])
AC_DEFUN([gcc_DEPRECATED],
[
AC_REQUIRE([check_WERROR])
HAVE_ATTRIBUTE_DEPRECATED=0
if test -n "$CC"; then
AS_IF([eval test x$lt_cv_werror_flag = xyes], [errflag=-Werror], [])
AC_CACHE_CHECK([if compiler supports __attribute__((deprecated))],
[lt_cv_attribute_deprecated],
[saved="$CFLAGS"
CFLAGS="$CFLAGS $errflag"
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[void func(int a, int b) __attribute__((deprecated));])],
[lt_cv_attribute_deprecated=yes],
[lt_cv_attribute_deprecated=no]
)
CFLAGS="$saved"
])
if test x$lt_cv_attribute_deprecated = xyes; then
HAVE_ATTRIBUTE_DEPRECATED=1
fi
fi
AC_SUBST([HAVE_ATTRIBUTE_DEPRECATED])
AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_DEPRECATED], [$HAVE_ATTRIBUTE_DEPRECATED],
[Define to 1 or 0, depending on whether the compiler supports the gcc deprecated attribute.])
])
AC_DEFUN([gcc_FORMAT],
[
AC_REQUIRE([check_WERROR])
HAVE_ATTRIBUTE_FORMAT=0
if test -n "$CC"; then
AS_IF([eval test x$lt_cv_werror_flag = xyes], [errflag=-Werror], [])
AC_CACHE_CHECK([if compiler supports __attribute__((format(printf)))],
[lt_cv_attribute_format],
[saved="$CFLAGS"
CFLAGS="$CFLAGS $errflag"
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[void __attribute__((format(printf, 1, 2))) foo(const char *fmt, ...);])],
[lt_cv_attribute_format=yes],
[lt_cv_attribute_format=no]
)
CFLAGS="$saved"
])
if test x$lt_cv_attribute_format = xyes; then
HAVE_ATTRIBUTE_FORMAT=1
fi
fi
AC_SUBST([HAVE_ATTRIBUTE_FORMAT])
AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_FORMAT], [$HAVE_ATTRIBUTE_FORMAT],
[Define to 1 or 0, depending on whether the compiler supports the format(printf) attribute.])
])
AC_DEFUN([gcc_PURE],
[
AC_REQUIRE([check_WERROR])
HAVE_ATTRIBUTE_PURE=0
if test -n "$CC"; then
AS_IF([eval test x$lt_cv_werror_flag = xyes], [errflag=-Werror], [])
AC_CACHE_CHECK([if compiler supports __attribute__((pure))],
[lt_cv_attribute_pure],
[saved="$CFLAGS"
CFLAGS="$CFLAGS $errflag"
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[void func(int a, int b) __attribute__((pure));])],
[lt_cv_attribute_pure=yes],
[lt_cv_attribute_pure=no]
)
CFLAGS="$saved"
])
if test x$lt_cv_attribute_pure = xyes; then
HAVE_ATTRIBUTE_PURE=1
fi
fi
AC_SUBST([HAVE_ATTRIBUTE_PURE])
AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_PURE], [$HAVE_ATTRIBUTE_PURE],
[Define to 1 or 0, depending on whether the compiler supports the pure attribute.])
])
|
