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Output an error if the INTPTR_MAX macro is undefined in C++

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When doing `conf.enable_cxx_abi` and compiling with FreeBSD + clang or MinGW, such as `INTPTR_MAX` constant macro is not defined if `#include <stdint.h>` precedes `#include <mruby.h>`.
Currently I get a warning when I use an undefined macro, but if I don't notice it I get confused in a link error.
It can be expected that the problem will be easier to understand by making a clear error.

Adding `-Werror=undef` as a compiler flag can also result in an error, but this can be a problem if the system header file itself uses undefined macros, for example.
This patch does minimal confirmation only, but has no side effects.
This commit is contained in:
dearblue
2021-07-17 20:32:38 +09:00
parent d4e22c2cec
commit dbd249cace
1 changed files with 3 additions and 0 deletions
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include/mruby.h
+3
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@@ -44,6 +44,9 @@
#include <limits.h>
#ifdef __cplusplus
#ifndef UINTPTR_MAX
#error Must be placed `#include <mruby.h>` before `#include <stdint.h>`
#endif
#ifndef SIZE_MAX
#ifdef __SIZE_MAX__
#define SIZE_MAX __SIZE_MAX__