[test][ARM][CMSE] Use clang_cc1 in arm_cmse.h tests

[hubert.reinterpretcast]

Summary

The arm_cmse.h header includes standard headers, but some tests that include this header explicitly specify a target. The standard headers found via the standard include paths need not be compatible with the explicitly-specified target from the tests. In order to avoid test failures caused by such incompatibility, this patch uses %clang_cc1, which doesn't pick up the host system headers.

[hubert.reinterpretcast]

Ping, @chill. It seems you checked these files in under D70817. The way they were written has issues as indicated by the patch description. Please take a look; thanks.

[chill]

I'm sorry, I don't understand the issue. Certainly it's the compiler (driver) responsibility to setup include paths according to the selected target.
How do you trigger a problem?

[hubert.reinterpretcast]

In D79693#2036599, @chill wrote:

How do you trigger a problem?

If your build was configured with DEFAULT_SYSROOT to a toolchain path that has a /include directory, then the contents of that directory would be picked up. The intent of the person doing the build with regards to DEFAULT_SYSROOT is to provide a sysroot for their intended targets, which may not match the needs of the explicit target provided here.

[chill]

I see.

I can also count (grep -rn '#include.*<std' | wc -l) 277 tests including standard headers. If they don't create a problem, wouldn't it be better to rewrite this test to use %clang_cc1 ?

[hubert.reinterpretcast]

• Use clang_cc1 in arm_cmse.h tests

[hubert.reinterpretcast]

In D79693#2036710, @chill wrote:

I can also count (grep -rn '#include.*<std' | wc -l) 277 tests including standard headers. If they don't create a problem, wouldn't it be better to rewrite this test to use %clang_cc1 ?

@chill, thanks for the suggestion. I've implemented it.

[chill]

LGTM, thank you.

clang/test/CodeGen/arm-cmse-nonsecure.c

-// RUN: %clang  -mlittle-endian -target thumbv8m.base-eabi  -emit-llvm -S -o - %s | FileCheck %s
-// RUN: %clang  -mbig-endian    -target thumbv8m.base-eabi  -emit-llvm -S -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple thumbv8m.base-unknown-unknown-eabi   -emit-llvm -mrelocation-model static -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple thumbebv8m.base-unknown-unknown-eabi -emit-llvm -mrelocation-model static -o - %s | FileCheck %s
 
 #include <arm_cmse.h>
 
 unsigned test_cmse_primitives(void *p) {
 // CHECK: define {{.*}} i32 @test_cmse_primitives
   cmse_address_info_t tt_val, ttt_val;
   unsigned sum;
 

clang/test/CodeGen/arm-cmse-secure.c

-// RUN: %clang -mlittle-endian -mcmse -target thumbv8m.base-eabi -emit-llvm -S -o - %s | FileCheck %s
-// RUN: %clang -mbig-endian    -mcmse -target thumbv8m.base-eabi -emit-llvm -S -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple thumbv8m.base-unknown-unknown-eabi   -emit-llvm -mrelocation-model static -mcmse -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple thumbebv8m.base-unknown-unknown-eabi -emit-llvm -mrelocation-model static -mcmse -o - %s | FileCheck %s
 
 #include <arm_cmse.h>
 
 unsigned test_cmse_primitives(void *p) {
 // CHECK: define {{.*}} i32 @test_cmse_primitives
   cmse_address_info_t tt_val, ttt_val;
   cmse_address_info_t tta_val, ttat_val;
   unsigned sum;