Fix uses of #ifdef/#ifndef

The linter now enforces our preference for `#if defined()` and
`#if !defined()`.

3 files changed, 14 insertions, 14 deletions

diff --git a/aclocal.m4 b/aclocal.m4
index f33c50c5ac..0d4727ff2b 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -866,7 +866,7 @@ case $TargetPlatform in
       esac ;;
     i386-unknown-mingw32) fptools_cv_leading_underscore=yes;;
     x86_64-unknown-mingw32) fptools_cv_leading_underscore=no;;
-    *) AC_RUN_IFELSE([AC_LANG_SOURCE([[#ifdef HAVE_NLIST_H
+    *) AC_RUN_IFELSE([AC_LANG_SOURCE([[#if defined(HAVE_NLIST_H)
 #include <nlist.h>
 struct nlist xYzzY1[] = {{"xYzzY1", 0},{0}};
 struct nlist xYzzY2[] = {{"_xYzzY2", 0},{0}};
@@ -876,7 +876,7 @@ int main(argc, argv)
 int argc;
 char **argv;
 {
-#ifdef HAVE_NLIST_H
+#if defined(HAVE_NLIST_H)
     if(nlist(argv[0], xYzzY1) == 0 && xYzzY1[0].n_value != 0)
         exit(1);
     if(nlist(argv[0], xYzzY2) == 0 && xYzzY2[0].n_value != 0)
@@ -1650,16 +1650,16 @@ then
     [fptools_cv_timer_create_works],
     [AC_TRY_RUN([
 #include <stdio.h>
-#ifdef HAVE_STDLIB_H
+#if defined(HAVE_STDLIB_H)
 #include <stdlib.h>
 #endif
-#ifdef HAVE_TIME_H
+#if defined(HAVE_TIME_H)
 #include <time.h>
 #endif
-#ifdef HAVE_SIGNAL_H
+#if defined(HAVE_SIGNAL_H)
 #include <signal.h>
 #endif
-#ifdef HAVE_UNISTD_H
+#if defined(HAVE_UNISTD_H)
 #include <unistd.h>
 #endif
 
diff --git a/hadrian/src/Rules/Generate.hs b/hadrian/src/Rules/Generate.hs
index c755e389eb..7f7fd2ee47 100644
--- a/hadrian/src/Rules/Generate.hs
+++ b/hadrian/src/Rules/Generate.hs
@@ -233,7 +233,7 @@ generateGhcPlatformH = do
     targetVendor   <- getSetting TargetVendor
     ghcUnreg       <- getFlag    GhcUnregisterised
     return . unlines $
-        [ "#ifndef __GHCPLATFORM_H__"
+        [ "#if !defined(__GHCPLATFORM_H__)"
         , "#define __GHCPLATFORM_H__"
         , ""
         , "#define BuildPlatform_TYPE  " ++ cppify hostPlatform
@@ -386,7 +386,7 @@ generateGhcAutoconfH = do
     ccLlvmBackend    <- getSetting CcLlvmBackend
     ccClangBackend   <- getSetting CcClangBackend
     return . unlines $
-        [ "#ifndef __GHCAUTOCONF_H__"
+        [ "#if !defined(__GHCAUTOCONF_H__)"
         , "#define __GHCAUTOCONF_H__" ]
         ++ configHContents ++
         [ "\n#define TABLES_NEXT_TO_CODE 1" | tablesNextToCode && not ghcUnreg ]
@@ -422,7 +422,7 @@ generateGhcBootPlatformH = do
     targetOs       <- getSetting TargetOs
     targetVendor   <- getSetting TargetVendor
     return $ unlines
-        [ "#ifndef __PLATFORM_H__"
+        [ "#if !defined(__PLATFORM_H__)"
         , "#define __PLATFORM_H__"
         , ""
         , "#define BuildPlatform_NAME  " ++ show buildPlatform
@@ -464,10 +464,10 @@ generateGhcVersionH = do
     patchLevel1 <- getSetting ProjectPatchLevel1
     patchLevel2 <- getSetting ProjectPatchLevel2
     return . unlines $
-        [ "#ifndef __GHCVERSION_H__"
+        [ "#if !defined(__GHCVERSION_H__)"
         , "#define __GHCVERSION_H__"
         , ""
-        , "#ifndef __GLASGOW_HASKELL__"
+        , "#if !defined(__GLASGOW_HASKELL__)"
         , "# define __GLASGOW_HASKELL__ " ++ version
         , "#endif"
         , ""]
diff --git a/includes/ghc.mk b/includes/ghc.mk
index 2421d9ca96..0d55c772e0 100644
--- a/includes/ghc.mk
+++ b/includes/ghc.mk
@@ -57,7 +57,7 @@ endif
 
 $(includes_H_VERSION) : mk/project.mk | $$(dir $$@)/.
 	@echo "Creating $@..."
-	@echo "#ifndef __GHCVERSION_H__"  > $@
+	@echo "#if !defined(__GHCVERSION_H__)"  > $@
 	@echo "#define __GHCVERSION_H__" >> $@
 	@echo >> $@
 	@echo "#define __GLASGOW_HASKELL__ $(ProjectVersionInt)" >> $@
@@ -92,7 +92,7 @@ else
 
 $(includes_H_CONFIG) : mk/config.h mk/config.mk includes/ghc.mk | $$(dir $$@)/.
 	@echo "Creating $@..."
-	@echo "#ifndef __GHCAUTOCONF_H__"  >$@
+	@echo "#if !defined(__GHCAUTOCONF_H__)"  >$@
 	@echo "#define __GHCAUTOCONF_H__" >>$@
 #
 #	Copy the contents of mk/config.h, turning '#define PACKAGE_FOO
@@ -125,7 +125,7 @@ endif
 $(includes_H_PLATFORM) : includes/Makefile | $$(dir $$@)/.
 	$(call removeFiles,$@)
 	@echo "Creating $@..."
-	@echo "#ifndef __GHCPLATFORM_H__"  >$@
+	@echo "#if !defined(__GHCPLATFORM_H__)"  >$@
 	@echo "#define __GHCPLATFORM_H__" >>$@
 	@echo >> $@
 	@echo "#define BuildPlatform_TYPE  $(HostPlatform_CPP)" >> $@