Work around an annoying, non-standard optimization in the glibc

headers, where malloc (and many other libc functions) are declared
with empty throw specifications, e.g.,  

  extern void *malloc (__SIZE_TYPE__ __size) throw () __attribute__
  ((__malloc__)) ;

The C++ standard doesn't seem to allow this, and redeclaring malloc as
the standard permits (as follows) resulted in Clang (rightfully!)
complaining about mis-matched exception specifications.

  void *malloc(size_t size);

We work around this by silently propagating an empty throw
specification "throw()" from a function with C linkage declared in a
system header to a redeclaration that has no throw specifier.

Ick.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95969 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 4 insertions, 0 deletions

diff --git a/test/SemaCXX/Inputs/lit.local.cfg b/test/SemaCXX/Inputs/lit.local.cfg
new file mode 100644
index 0000000000..e6f55eef7a
--- /dev/null
+++ b/test/SemaCXX/Inputs/lit.local.cfg
@@ -0,0 +1 @@
+config.suffixes = []
diff --git a/test/SemaCXX/Inputs/malloc.h b/test/SemaCXX/Inputs/malloc.h
new file mode 100644
index 0000000000..c54d621501
--- /dev/null
+++ b/test/SemaCXX/Inputs/malloc.h
@@ -0,0 +1,3 @@
+extern "C" {
+extern void *malloc (__SIZE_TYPE__ __size) throw () __attribute__ ((__malloc__)) ;
+}