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scripts/kerneldoc: For Sphinx 3 use c:macro for macros with arguments 

The kerneldoc script currently emits Sphinx markup for a macro with
arguments that uses the c:function directive. This is correct for
Sphinx versions earlier than Sphinx 3, where c:macro doesn't allow
documentation of macros with arguments and c:function is not picky
about the syntax of what it is passed. However, in Sphinx 3 the
c:macro directive was enhanced to support macros with arguments,
and c:function was made more picky about what syntax it accepted.

When kerneldoc is told that it needs to produce output for Sphinx
3 or later, make it emit c:function only for functions and c:macro
for macros with arguments. We assume that anything with a return
type is a function and anything without is a macro.

This fixes the Sphinx error:

/home/petmay01/linaro/qemu-from-laptop/qemu/docs/../include/qom/object.h:155:Error in declarator
If declarator-id with parameters (e.g., 'void f(int arg)'):
  Invalid C declaration: Expected identifier in nested name. [error at 25]
    DECLARE_INSTANCE_CHECKER ( InstanceType,  OBJ_NAME,  TYPENAME)
    -------------------------^
If parenthesis in noptr-declarator (e.g., 'void (*f(int arg))(double)'):
  Error in declarator or parameters
  Invalid C declaration: Expecting "(" in parameters. [error at 39]
    DECLARE_INSTANCE_CHECKER ( InstanceType,  OBJ_NAME,  TYPENAME)
    ---------------------------------------^

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Tested-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20201030174700.7204-2-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-11-02 16:52:18 +00:00
parent c20a135a7a
commit 92bb29f9b2
1 changed files with 17 additions and 1 deletions
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@ -839,7 +839,23 @@ sub output_function_rst(%) {
output_highlight_rst($args{'purpose'});
$start = "\n\n**Syntax**\n\n ``";
} else {
print ".. c:function:: ";
if ((split(/\./, $sphinx_version))[0] >= 3) {
# Sphinx 3 and later distinguish macros and functions and
# complain if you use c:function with something that's not
# syntactically valid as a function declaration.
# We assume that anything with a return type is a function
# and anything without is a macro.
if ($args{'functiontype'} ne "") {
print ".. c:function:: ";
} else {
print ".. c:macro:: ";
}
} else {
# Older Sphinx don't support documenting macros that take
# arguments with c:macro, and don't complain about the use
# of c:function for this.
print ".. c:function:: ";
}
}
if ($args{'functiontype'} ne "") {
$start .= $args{'functiontype'} . " " . $args{'function'} . " (";