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include: rearrange for standard use of extern "C" in various headers

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Consistently place C++ use of extern "C" after all include directives,
within the negative branch of _ASMLANGUAGE if used.

The inclusion of the generated syscall files is placed outside the
extern "C" block as the generated file has its own extern "C" block.

Background from issue #17997:

Declarations that use C linkage should be placed within extern "C"
so the language linkage is correct when the header is included by
a C++ compiler.

Similarly #include directives should be outside the extern "C" to
ensure the language-specific default linkage is applied to any
declarations provided by the included header.

See: https://en.cppreference.com/w/cpp/language/language_linkage
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2019-08-12 12:54:52 -05:00 • committed by Carles Cufí
commit 6554a5e5b6
16 changed files with 56 additions and 53 deletions
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6
include/sys_clock.h
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@ -19,13 +19,13 @@
#include <sys/util.h>
#include <sys/dlist.h>
#include <toolchain.h>
#include <zephyr/types.h>
#ifdef __cplusplus
extern "C" {
#endif
#include <toolchain.h>
#include <zephyr/types.h>
#ifdef CONFIG_TICKLESS_KERNEL
extern int _sys_clock_always_on;
extern void z_enable_sys_clock(void);