Test fails when the directory defined by XDG_CACHE_HOME does not exist

[smalltalkman]

Describe the bug

After pointing the XDG_CACHE_HOME environment variable to a non-existent directory, the relevant tests will fail.

Reproduction Steps

Point the XDG_CACHE_HOME environment variable to a non-existent directory:

# echo $XDG_CACHE_HOME
/d/gym/test/mingw-w64-packages/mingw-w64-v/.cache/mingw-w64-x86_64-v-0.4.3-1

# ll $XDG_CACHE_HOME
ls: cannot access '/d/gym/test/mingw-w64-packages/mingw-w64-v/.cache/mingw-w64-x86_64-v-0.4.3-1': No such file or directory

Perform related tests:

# ./v0 -keepc -g -showcc -cc gcc -o test_v.exe cmd/v
> C compiler cmd: gcc "@D:\gym\test\mingw-w64-packages\mingw-w64-v\tmp\mingw-w64-x86_64-v-0.4.3-1\v_0\test_v.exe.tmp.c.rsp"
> C compiler response file "D:\gym\test\mingw-w64-packages\mingw-w64-v\tmp\mingw-w64-x86_64-v-0.4.3-1\v_0\test_v.exe.tmp.c.rsp":
  -fwrapv -g -no-pie -o "D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\src\\v-0.4.3\\test_v.exe" -Wl,-stack=16777216 -Werror=implicit-function-declaration -I "D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\src\\v-0.4.3\\thirdparty\\stdatomic\\win" "D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\tmp\\mingw-w64-x86_64-v-0.4.3-1\\v_0\\test_v.exe.tmp.c" -std=c99 -D_DEFAULT_SOURCE -municode -ldbghelp -lws2_32 -ladvapi32 -lshell32

# ./test_v test vlib/flag/default_flag_options_test.v
---- Testing... ----------------------------------------------------------------
 FAIL  3866.702 ms vlib/flag/default_flag_options_test.v
D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\src\\v-0.4.3\\vlib\\flag\\default_flag_options_test.v:11: fn testsuite_begin
   > assert res.exit_code == 0
     Left value: 1
    Right value: 0

D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\src\\v-0.4.3\\vlib\\flag\\default_flag_options_test.v:24: fn check_program
   > assert res.exit_code == 0
     Left value: 1
    Right value: 0

--------------------------------------------------------------------------------
Failed command 1:    "D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3\test_v.exe"   -o "D:\gym\test\mingw-w64-packages\mingw-w64-v\tmp\mingw-w64-x86_64-v-0.4.3-1\v_0\tsession_478c_14158731\01HGFFJ9RCMDYD0XSW6460YP0H\default_flag_options_test.exe" "D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3\vlib\flag\default_flag_options_test.v"
Summary for all V _test.v files: 1 failed, 1 total. Runtime: 3870 ms, on 1 job.

# ./test_v test vlib/flag/usage_example_test.v
---- Testing... ----------------------------------------------------------------
 FAIL  3873.308 ms vlib/flag/usage_example_test.v
D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\src\\v-0.4.3\\vlib\\flag\\usage_example_test.v:11: fn testsuite_begin
   > assert res.exit_code == 0
     Left value: 1
    Right value: 0

D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\src\\v-0.4.3\\vlib\\flag\\usage_example_test.v:26: fn check_program
   > assert res.exit_code == 0
     Left value: 1
    Right value: 0

--------------------------------------------------------------------------------
Failed command 1:    "D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3\test_v.exe"   -o "D:\gym\test\mingw-w64-packages\mingw-w64-v\tmp\mingw-w64-x86_64-v-0.4.3-1\v_0\tsession_1c04_13286576\01HGFFM4V4MZY0R8AMMNH9WAN5\usage_example_test.exe" "D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3\vlib\flag\usage_example_test.v"
Summary for all V _test.v files: 1 failed, 1 total. Runtime: 3875 ms, on 1 job.

# ./test_v test vlib/vweb/tests/vweb_test.v
---- Testing... ----------------------------------------------------------------
 FAIL 138246.860 ms vlib/vweb/tests/vweb_test.v
builder error: `D:\gym\test\mingw-w64-packages\mingw-w64-v\.cache\mingw-w64-x86_64-v-0.4.3-1` does not exist; code: 1
D:\\gym\\test\\mingw-w64-packages\\mingw-w64-v\\src\\v-0.4.3\\vlib\\vweb\\tests\\vweb_test.v:32: fn test_a_simple_vweb_app_can_be_compiled
   > assert did_server_compile == 0
     Left value: 1
    Right value: 0

The system cannot find the path specified.
> client retries: 1
> client retries: 2
> client retries: 3
> client retries: 4
> client retries: 5
> client retries: 6
> client retries: 7
> client retries: 8
> client retries: 9
> client retries: 10
> client retries: 11
> client retries: 12
> client retries: 13
> client retries: 14
> client retries: 15
> client retries: 16
> client retries: 17
> client retries: 18
> client retries: 19
> client retries: 20
could not create a tcp client connection to 127.0.0.1:12380 after 20 retries

--------------------------------------------------------------------------------
Failed command 1:    "D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3\test_v.exe"   -o "D:\gym\test\mingw-w64-packages\mingw-w64-v\tmp\mingw-w64-x86_64-v-0.4.3-1\v_0\tsession_406c_13320179\01HGFFNAXWMB6VC44GKRQEA33V\vweb_test.exe" "D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3\vlib\vweb\tests\vweb_test.v"
Summary for all V _test.v files: 1 failed, 1 total. Runtime: 138249 ms, on 1 job.

Expected Behavior

All tests pass.

Current Behavior

Tests related to the XDG_CACHE_HOME environment variable failed.

Possible Solution

Automatically create the directory specified by XDG_CACHE_HOME, just like creating $HOME/.cache.

v/vlib/os/os.v

Line 739 in 00b1ce5

if !is_dir(cdir) && !is_link(cdir) {

Additional Information/Context

No response

V version

0.4.3

Environment details (OS name and version, etc.)

V full version: V 0.4.3 44cf145
OS: windows, Microsoft Windows 7 רҵ▒▒ v7601 64-bit
Processor: 4 cpus, 64bit, little endian,

getwd: D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3
vexe: D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3\test_v.exe
vexe mtime: 2023-11-30 06:43:53

vroot: OK, value: D:\gym\test\mingw-w64-packages\mingw-w64-v\src\v-0.4.3
VMODULES: NOT writable, value: D:/gym/test/mingw-w64-packages/mingw-w64-v/vmodules/mingw-w64-x86_64-v-0.4.3-1
VTMP: OK, value: D:\gym\test\mingw-w64-packages\mingw-w64-v\tmp\mingw-w64-x86_64-v-0.4.3-1\v_0

Git version: Error: 'git' is not recognized as an internal or external command,
operable program or batch file.

Git vroot status: Error: 'git' is not recognized as an internal or external command,
operable program or batch file.
.git/config present: false

CC version: cc (Rev2, Built by MSYS2 project) 13.2.0
thirdparty/tcc: N/A

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