Fix cpp_sys_macro_p with -ftrack-macro-expansion

cpp_sys_macro_p crashes when -ftrack-macro-expansion is on.  The issue
can be reproduced by running the tests:

    runtest --tool gcc --tool_opts="-ftrack-macro-expansion" cpp.exp=sysmac1.c
    runtest --tool gcc --tool_opts="-ftrack-macro-expansion" cpp.exp=sysmac2.c

This is because it just doesn't support that mode.  Fixed thus.
Tested and bootstrapped on x86_64-unknown-linux-gnu against trunk.

Note that the bootstrap with -ftrack-macro-expansion turned on
exhibits other separate issues that are addressed in subsequent
patches.  This patch just fixes one class of problems.

The patch does pass bootstrap with -ftrack-macro-expansion turned off,
though.

libcpp/

	* macro.c (cpp_sys_macro_p):  Support -ftrack-macro-expansion.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@186965 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 6 insertions, 1 deletions

diff --git a/libcpp/macro.c b/libcpp/macro.c
index 54de3e3fc0d..4f8e52f22cf 100644
--- a/libcpp/macro.c
+++ b/libcpp/macro.c
@@ -2436,7 +2436,12 @@ cpp_get_token_with_location (cpp_reader *pfile, source_location *loc)
 int
 cpp_sys_macro_p (cpp_reader *pfile)
 {
-  cpp_hashnode *node = pfile->context->c.macro;
+  cpp_hashnode *node = NULL;
+
+  if (pfile->context->tokens_kind == TOKENS_KIND_EXTENDED)
+    node = pfile->context->c.mc->macro_node;
+  else
+    node = pfile->context->c.macro;
 
   return node && node->value.macro && node->value.macro->syshdr;
 }