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-rw-r--r--m4/fp_setup_project_version.m44
-rw-r--r--testsuite/tests/driver/all.T1
-rw-r--r--testsuite/tests/driver/patch-level2.hs6
3 files changed, 11 insertions, 0 deletions
diff --git a/m4/fp_setup_project_version.m4 b/m4/fp_setup_project_version.m4
index 26df01865b..d51759add7 100644
--- a/m4/fp_setup_project_version.m4
+++ b/m4/fp_setup_project_version.m4
@@ -77,6 +77,10 @@ AC_DEFUN([FP_SETUP_PROJECT_VERSION],
ProjectPatchLevel1=`echo $ProjectPatchLevel | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\1/'`
ProjectPatchLevel2=`echo $ProjectPatchLevel | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\3/'`
+ # The project patchlevel1/2 is zero unless stated otherwise
+ test -z "$ProjectPatchLevel1" && ProjectPatchLevel1=0
+ test -z "$ProjectPatchLevel2" && ProjectPatchLevel2=0
+
AC_SUBST([ProjectPatchLevel1])
AC_SUBST([ProjectPatchLevel2])
diff --git a/testsuite/tests/driver/all.T b/testsuite/tests/driver/all.T
index 907002fcf7..af81d61eb8 100644
--- a/testsuite/tests/driver/all.T
+++ b/testsuite/tests/driver/all.T
@@ -303,3 +303,4 @@ test('T20200loop', extra_files(['T20200loop']), multimod_compile,
['Datatypes', '-iT20200loop -O -v0'])
test('T20316', normal, makefile_test, [])
test('MultiRootsErr', normal, multimod_compile_fail, ['MultiRootsErr', 'MultiRootsErr'])
+test('patch-level2', normal, compile, ['-Wcpp-undef'])
diff --git a/testsuite/tests/driver/patch-level2.hs b/testsuite/tests/driver/patch-level2.hs
new file mode 100644
index 0000000000..ae89fbed8e
--- /dev/null
+++ b/testsuite/tests/driver/patch-level2.hs
@@ -0,0 +1,6 @@
+{-# LANGUAGE CPP #-}
+module PatchLevel2 where
+
+
+p2 = __GLASGOW_HASKELL_PATCHLEVEL2__
+p1 = __GLASGOW_HASKELL_PATCHLEVEL1__