diff options
Diffstat (limited to 'm4/ax_gcc_func_attribute.m4')
| -rw-r--r-- | m4/ax_gcc_func_attribute.m4 | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/m4/ax_gcc_func_attribute.m4 b/m4/ax_gcc_func_attribute.m4 index 1edceba..fa4e089 100644 --- a/m4/ax_gcc_func_attribute.m4 +++ b/m4/ax_gcc_func_attribute.m4 @@ -1,5 +1,5 @@ # =========================================================================== -# http://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html +# https://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html # =========================================================================== # # SYNOPSIS @@ -38,9 +38,11 @@ # dllimport # error # externally_visible +# fallthrough # flatten # format # format_arg +# gnu_format # gnu_inline # hot # ifunc @@ -53,6 +55,8 @@ # nothrow # optimize # pure +# sentinel +# sentinel_position # unused # used # visibility @@ -61,9 +65,9 @@ # weak # weakref # -# Unsuppored function attributes will be tested with a prototype returning -# an int and not accepting any arguments and the result of the check might -# be wrong or meaningless so use with care. +# Unsupported function attributes will be tested with a prototype +# returning an int and not accepting any arguments and the result of the +# check might be wrong or meaningless so use with care. # # LICENSE # @@ -74,7 +78,7 @@ # and this notice are preserved. This file is offered as-is, without any # warranty. -#serial 3 +#serial 13 AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1]) @@ -128,12 +132,18 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ [externally_visible], [ int foo( void ) __attribute__(($1)); ], + [fallthrough], [ + void foo( int x ) {switch (x) { case 1: __attribute__(($1)); case 2: break ; }}; + ], [flatten], [ int foo( void ) __attribute__(($1)); ], [format], [ int foo(const char *p, ...) __attribute__(($1(printf, 1, 2))); ], + [gnu_format], [ + int foo(const char *p, ...) __attribute__((format(gnu_printf, 1, 2))); + ], [format_arg], [ char *foo(const char *p) __attribute__(($1(1))); ], @@ -175,6 +185,15 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ [pure], [ int foo( void ) __attribute__(($1)); ], + [sentinel], [ + int foo(void *p, ...) __attribute__(($1)); + ], + [sentinel_position], [ + int foo(void *p, ...) __attribute__(($1(1))); + ], + [returns_nonnull], [ + void *foo( void ) __attribute__(($1)); + ], [unused], [ int foo( void ) __attribute__(($1)); ], @@ -184,6 +203,8 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ [visibility], [ int foo_def( void ) __attribute__(($1("default"))); int foo_hid( void ) __attribute__(($1("hidden"))); + int foo_int( void ) __attribute__(($1("internal"))); + int foo_pro( void ) __attribute__(($1("protected"))); ], [warning], [ int foo( void ) __attribute__(($1(""))); @@ -207,7 +228,7 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ dnl GCC doesn't exit with an error if an unknown attribute is dnl provided but only outputs a warning, so accept the attribute dnl only if no warning were issued. - [AS_IF([test -s conftest.err], + [AS_IF([grep -- -Wattributes conftest.err], [AS_VAR_SET([ac_var], [no])], [AS_VAR_SET([ac_var], [yes])])], [AS_VAR_SET([ac_var], [no])]) |