clang/test/ClangScanDeps/header-search-case-sensitivity.c

   1 // This test checks that reusing FileManager produces deterministic results on case-insensitive filesystems.
   2
   3 // RUN: rm -rf %t
   4 // RUN: split-file %s %t
   5
   6 //--- dir1/arm/lower.h
   7 //--- dir2/ARM/upper.h
   8 //--- t1.c
   9 #include "upper.h"
  10 //--- t2.c
  11 #include "arm/lower.h"
  12
  13 //--- cdb.json.template
  14 [{
  15   "directory": "DIR",
  16   "command": "clang -fsyntax-only DIR/t1.c -I DIR/dir2/ARM -I DIR/dir1",
  17   "file": "DIR/t1.c"
  18 },{
  19   "directory": "DIR",
  20   "command": "clang -fsyntax-only DIR/t2.c -I DIR/dir2     -I DIR/dir1",
  21   "file": "DIR/t2.c"
  22 }]
  23
  24 //--- cdb-rev.json.template
  25 [{
  26   "directory": "DIR",
  27   "command": "clang -fsyntax-only DIR/t2.c -I DIR/dir2     -I DIR/dir1",
  28   "file": "DIR/t2.c"
  29 },{
  30   "directory": "DIR",
  31   "command": "clang -fsyntax-only DIR/t1.c -I DIR/dir2/ARM -I DIR/dir1",
  32   "file": "DIR/t1.c"
  33 }]
  34
  35 // RUN: sed -e "s|DIR|%/t|g" %t/cdb.json.template     > %t/cdb.json
  36 // RUN: sed -e "s|DIR|%/t|g" %t/cdb-rev.json.template > %t/cdb-rev.json
  37
  38 // RUN: clang-scan-deps -compilation-database=%t/cdb.json     -format make -j 1 | sed 's:\\\\\?:/:g' | FileCheck %s
  39
  40 // In the reversed case, Clang starts by scanning "t2.c". When looking up the "arm/lower.h" header,
  41 // the string is appended to "DIR/dir2". That file ("DIR/dir2/arm/lower.h") doesn't exist, but when
  42 // learning so, the FileManager stats and caches the parent directory ("DIR/dir2/arm"), using the
  43 // UID as the key.
  44 // When scanning "t1.c" later on, the "DIR/dir2/ARM" search directory is assigned the **same**
  45 // directory entry (with lowercase "arm"), since they share the UID on case-insensitive filesystems.
  46 // To preserve the correct case throughout the compiler for any file within that directory, it's
  47 // important to use the spelling actually used, not just the cached one.
  48 // RUN: clang-scan-deps -compilation-database=%t/cdb-rev.json -format make -j 1 | sed 's:\\\\\?:/:g' | FileCheck %s
  49
  50 // CHECK: ARM/upper.h