Compilation database test: don't try to output to CWD

[sammccall]

Summary

Write output from compilation database test to %T rather than the working dir.
Sometimes CWD isn't writable!
Also specify no-canonical-prefixes so that clang has 'clang' in the name.

[sammccall]

bkramer: summoning my lit guru for guidance, is there a better way?

[bkramer]

Annoying. This test really shouldn't generate binary object files.

Can we check in this patch now to unblock stuff and then look into how to do a dry run with -MJ? Usually driver tests use -### for that but the code for -MJ explicitly disables itself when -### is found on the command line.

test/Driver/compilation_database.c

2

You can hoist the cd %T to a separate RUN line at the top instead of duplicating it.

[sammccall]

Hoist cd %T to avoid repeating it.

[sammccall]

Thanks! That makes sense.

test/Driver/compilation_database.c

-// RUN: %clang -MD -MP --sysroot=somewhere -c -x c %s -xc++ %s -Wall -MJ - 2>&1 | FileCheck %s
-// RUN: not %clang -c -x c %s -MJ %s/non-existant 2>&1 | FileCheck --check-prefix=ERROR %s
+// RUN: cd "%T"
+// RUN: %clang -MD -MP --sysroot=somewhere -c -x c %s -xc++ %s -Wall -MJ - -no-canonical-prefixes 2>&1 | FileCheck %s
+// RUN: not %clang -c -x c %s -MJ %s/non-existant -no-canonical-prefixes 2>&1 | FileCheck --check-prefix=ERROR %s
 
-// CHECK: { "directory": "[[CWD:[^"]+]]",  "file": "[[SRC:[^"]+[/|\\]compilation_database.c]]", "output": "compilation_database.o", "arguments": ["{{[^"]*}}clang{{[^"]*}}", "-xc", "[[SRC]]", "--sysroot=somewhere", "-c", "-Wall",{{.*}} "--target={{[^"]+}}"]},
-// CHECK: { "directory": "[[CWD:[^"]+]]",  "file": "[[SRC:[^"]+[/|\\]compilation_database.c]]", "output": "compilation_database.o", "arguments": ["{{[^"]*}}clang{{[^"]*}}", "-xc++", "[[SRC]]", "--sysroot=somewhere", "-c", "-Wall",{{.*}} "--target={{[^"]+}}"]},
+// CHECK: { "directory": "{{.*}}",  "file": "[[SRC:[^"]+[/|\\]compilation_database.c]]", "output": "compilation_database.o", "arguments": ["{{[^"]*}}clang{{[^"]*}}", "-xc", "[[SRC]]", "--sysroot=somewhere", "-c", "-Wall",{{.*}} "--target={{[^"]+}}"]},
+// CHECK: { "directory": "{{.*}}",  "file": "[[SRC:[^"]+[/|\\]compilation_database.c]]", "output": "compilation_database.o", "arguments": ["{{[^"]*}}clang{{[^"]*}}", "-xc++", "[[SRC]]", "--sysroot=somewhere", "-c", "-Wall",{{.*}} "--target={{[^"]+}}"]},
 // ERROR: error: compilation database '{{.*}}/non-existant' could not be opened:
 
 int main(void) {
   return 0;
 }