From: Sascha Wildner <saw@online.de>
Date: Sun, 8 Sep 2019 10:28:54 +0000 (+0200)
Subject: <sys/cdefs.h>: Add a macro to control ISO/IEC TR 24731-1 visibility.
X-Git-Tag: v5.8.0rc1~1004
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/2470bb8060915f5afafb687ac351aa705889fafe

<sys/cdefs.h>: Add a macro to control ISO/IEC TR 24731-1 visibility.

The __STDC_WANT_LIB_EXT1__ macro controls visibility for code that
wants to use it. In addition, visibility is enabled for our default
environment that exposes everything.

Taken-from: FreeBSD
---

diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index e750dff990..fea444908a 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -661,24 +661,38 @@
 #define	__XSI_VISIBLE		0
 #define	__BSD_VISIBLE		0
 #define	__ISO_C_VISIBLE		1990
+#define	__EXT1_VISIBLE		0
 #elif defined(_C99_SOURCE)	/* Localism to specify strict C99 env. */
 #define	__POSIX_VISIBLE		0
 #define	__XSI_VISIBLE		0
 #define	__BSD_VISIBLE		0
 #define	__ISO_C_VISIBLE		1999
+#define	__EXT1_VISIBLE		0
 #elif defined(_C11_SOURCE)	/* Localism to specify strict C11 env. */
 #define	__POSIX_VISIBLE		0
 #define	__XSI_VISIBLE		0
 #define	__BSD_VISIBLE		0
 #define	__ISO_C_VISIBLE		2011
+#define	__EXT1_VISIBLE		0
 #else				/* Default environment: show everything. */
 #define	__POSIX_VISIBLE		200809
 #define	__XSI_VISIBLE		700
 #define	__BSD_VISIBLE		1
 #define	__ISO_C_VISIBLE		2011
+#define	__EXT1_VISIBLE		1
 #endif
 #endif
 
+/* User override __EXT1_VISIBLE */
+#if defined(__STDC_WANT_LIB_EXT1__)
+#undef	__EXT1_VISIBLE
+#if __STDC_WANT_LIB_EXT1__
+#define	__EXT1_VISIBLE		1
+#else
+#define	__EXT1_VISIBLE		0
+#endif
+#endif /* __STDC_WANT_LIB_EXT1__ */
+
 /*
  * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
  * of kernel modules which are discarded from binutils 2.17.50+ otherwise.