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helper: add compiler.h to handle compiler specific workarounds 

Not all compilers nor compiler versions supports the attributes
used in OpenOCD code.
Collect in a single file the workaround to handle them.

Change-Id: I92d871337281169134ce8e40b2064591518be71f
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7519
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Antonio Borneo 2023-03-04 23:56:35 +01:00
parent 904d58c208
commit e8f376e3c1
3 changed files with 50 additions and 3 deletions
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3
src/helper/Makefile.am
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@ -34,7 +34,8 @@ noinst_LTLIBRARIES += %D%/libhelper.la
%D%/jep106.h \
%D%/jep106.inc \
%D%/jim-nvp.h \
%D%/nvp.h
%D%/nvp.h \
%D%/compiler.h
STARTUP_TCL_SRCS += %D%/startup.tcl
EXTRA_DIST += \

44
src/helper/compiler.h Normal file
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@ -0,0 +1,44 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This file contains compiler specific workarounds to handle different
* compilers and different compiler versions.
* Inspired by Linux's include/linux/compiler_attributes.h
* and file sys/cdefs.h in libc and newlib.
*/
#ifndef OPENOCD_HELPER_COMPILER_H
#define OPENOCD_HELPER_COMPILER_H
/*
* __has_attribute is supported on gcc >= 5, clang >= 2.9 and icc >= 17.
*/
#ifndef __has_attribute
# define __has_attribute(x) 0
#endif
/*
* The __returns_nonnull function attribute marks the return type of the function
* as always being non-null.
*/
#ifndef __returns_nonnull
# if __has_attribute(__returns_nonnull__)
# define __returns_nonnull __attribute__((__returns_nonnull__))
# else
# define __returns_nonnull
# endif
#endif
/*
* The __nonnull function attribute marks pointer parameters that
* must not be NULL.
*/
#ifndef __nonnull
# if __has_attribute(__nonnull__)
# define __nonnull(params) __attribute__ ((__nonnull__ params))
# else
# define __nonnull(params)
# endif
#endif
#endif /* OPENOCD_HELPER_COMPILER_H */

6
src/helper/nvp.h
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@ -20,6 +20,8 @@
#ifndef OPENOCD_HELPER_NVP_H
#define OPENOCD_HELPER_NVP_H
#include <helper/compiler.h>
/** Name Value Pairs, aka: NVP
* - Given a string - return the associated int.
* - Given a number - return the associated string.
@ -65,9 +67,9 @@ struct command_invocation;
/* Name Value Pairs Operations */
const struct nvp *nvp_name2value(const struct nvp *nvp_table, const char *name)
__attribute__((returns_nonnull, nonnull(1)));
__returns_nonnull __nonnull((1));
const struct nvp *nvp_value2name(const struct nvp *nvp_table, int v)
__attribute__((returns_nonnull, nonnull(1)));
__returns_nonnull __nonnull((1));
void nvp_unknown_command_print(struct command_invocation *cmd, const struct nvp *nvp,
const char *param_name, const char *param_value);