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-rw-r--r--gcc/ChangeLog6
-rw-r--r--gcc/doc/cpp.texi3
2 files changed, 9 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7362f26..dd790a2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,11 @@
2018-11-17 Sandra Loosemore <sandra@codesourcery.com>
+ PR c++/4225
+ * doc/cpp.texi (System Headers): Add note about implicit
+ extern "C" block on targets that define SYSTEM_IMPLICIT_EXTERN_C.
+
+2018-11-17 Sandra Loosemore <sandra@codesourcery.com>
+
PR c++/4025
* doc/invoke.texi (C++ Dialect Options): Clarify usage of
-fno-implicit-templates.
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi
index 25518ee..568b828 100644
--- a/gcc/doc/cpp.texi
+++ b/gcc/doc/cpp.texi
@@ -1131,6 +1131,9 @@ header, no matter where it was found. Code that comes before the
system_header}} has no effect in the primary source file.
@end itemize
+On some targets, such as RS/6000 AIX, GCC implicitly surrounds all
+system headers with an @samp{extern "C"} block when compiling as C++.
+
@node Macros
@chapter Macros