GHC base directory assumptions

GHC and ghc-pkg make some pretty hard assumptions about where they're running on Windows. They assume that they are always running from foo/bin/ghc.exe and that to find the lib folder they can drop bin/ghc.exe from the base path and append lib.

This is already false for the testsuite, which when testing the bindist has one test which puts the binaries in inplace/test spaces.

For some reason before this was either being skipped or mysteriously passing. But as of 2017.02.11 our luck ran out.

the testsuite triggers a failure such as:

[04:16:21][Step 3/6] ghc-pkg.exe: Can't find package database in C:/TeamCity/buildAgent/work/28754042a1be6052/inplace/test   sp\lib
[04:16:22][Step 3/6] ghc-pkg.exe: Can't find package database in C:/TeamCity/buildAgent/work/28754042a1be6052/inplace/test   sp\lib
[04:16:23][Step 3/6] Traceback (most recent call last):
[04:16:23][Step 3/6]   File "../../driver/runtests.py", line 215, in <module>
[04:16:23][Step 3/6]     pkginfo = str(getStdout([config.ghc_pkg, 'dump']))
[04:16:23][Step 3/6]   File "/c/TeamCity/buildAgent/work/28754042a1be6052/testsuite/driver/testutil.py", line 23, in getStdout
[04:16:23][Step 3/6]     raise Exception("Command failed: " + str(cmd_and_args))
[04:16:23][Step 3/6] Exception: Command failed: ['"/c/TeamCity/buildAgent/work/28754042a1be6052/inplace/test   spaces/ghc-pkg.exe"', 'dump']
[04:16:23][Step 3/6] make: *** [../../mk/test.mk:299: test] Error 1
[04:16:23][Step 3/6] 
[04:16:23][Step 3/6] ==== STAGE 1 TESTS ==== 
[04:16:23][Step 3/6] cat: testsuite_summary_stage1.txt: No such file or directory
[04:16:23][Step 3/6] Process exited with code 1

Let's soften the assumption and just check that ../lib exists instead.

Trac metadata

Trac field	Value
Version	8.0.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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