When looking for the module associated with one of our magical builtin headers, speculatively load module maps.

The "magical" builtin headers are the headers we provide as part of
the C standard library, which typically comes from /usr/include. We
essentially merge our headers into that location (due to cyclic
dependencies). This change makes sure that, when header search finds
one of our builtin headers, we figure out which module it actually
lives in. This case is fairly rare; one ends up having to include one
of the few built-in C headers we provide before including anything
from /usr/include to trigger it. Fixes <rdar://problem/13787184>.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180934 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 19 insertions, 3 deletions

diff --git a/test/Modules/Inputs/System/usr/include/dbl_max.h b/test/Modules/Inputs/System/usr/include/dbl_max.h
new file mode 100644
index 0000000000..9a020d1bf5
--- /dev/null
+++ b/test/Modules/Inputs/System/usr/include/dbl_max.h
@@ -0,0 +1 @@
+#define DBL_MAX __DBL_MAX__
diff --git a/test/Modules/Inputs/System/usr/include/module.map b/test/Modules/Inputs/System/usr/include/module.map
index 884b59c80c..9b2f3af2ba 100644
--- a/test/Modules/Inputs/System/usr/include/module.map
+++ b/test/Modules/Inputs/System/usr/include/module.map
@@ -19,3 +19,14 @@ module cstd [system] {
     header "stdint.h"
   }
 }
+
+module other_constants {
+  explicit module dbl_max {
+    header "dbl_max.h"
+  }
+}
+
+module uses_other_constants {
+  header "uses_other_constants.h"
+  export *
+}
diff --git a/test/Modules/Inputs/System/usr/include/uses_other_constants.h b/test/Modules/Inputs/System/usr/include/uses_other_constants.h
new file mode 100644
index 0000000000..f6d4cca9f8
--- /dev/null
+++ b/test/Modules/Inputs/System/usr/include/uses_other_constants.h
@@ -0,0 +1,3 @@
+@import other_constants;
+#include <float.h>
+
diff --git a/test/Modules/cstd.m b/test/Modules/cstd.m
index 6d896a9155..3d1dcf38e3 100644
--- a/test/Modules/cstd.m
+++ b/test/Modules/cstd.m
@@ -1,6 +1,9 @@
 // RUN: rm -rf %t
 // RUN: %clang -fsyntax-only -isystem %S/Inputs/System/usr/include -fmodules -fmodules-cache-path=%t -D__need_wint_t -Werror=implicit-function-declaration %s
 
+@import uses_other_constants;
+const double other_value = DBL_MAX;
+
 // Supplied by compiler, but referenced from the "/usr/include" module map.
 @import cstd.float_constants;
 
@@ -16,7 +19,7 @@ void test_fprintf(FILE *file) {
 // Supplied by compiler, which forwards to the "/usr/include" version.
 @import cstd.stdint;
 
-my_awesome_nonstandard_integer_type value;
+my_awesome_nonstandard_integer_type value2;
 
 // Supplied by the compiler; that version wins.
 @import cstd.stdbool;
@@ -25,5 +28,3 @@ my_awesome_nonstandard_integer_type value;
 #  error "bool was not defined!"
 #endif
 
-
-