1// RUN: rm -rf %t
2// RUN: rm -rf %t-saved
3// RUN: mkdir %t-saved
4
5// Initial module build
6// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash \
7// RUN:     -isystem %S/Inputs/System/usr/include -fsyntax-only %s -verify
8// RUN: cp %t/cstd.pcm %t-saved/cstd.pcm
9
10// Even with -Werror don't rebuild a system module
11// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash \
12// RUN:     -isystem %S/Inputs/System/usr/include -fsyntax-only %s -verify -Werror
13// RUN: diff %t/cstd.pcm %t-saved/cstd.pcm
14
15// Unless -Wsystem-headers is on
16// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash \
17// RUN:     -isystem %S/Inputs/System/usr/include -fsyntax-only %s -verify \
18// RUN:     -Werror=unused -Wsystem-headers
19// RUN: not diff %t/cstd.pcm %t-saved/cstd.pcm
20
21// expected-no-diagnostics
22@import cstd;
23