Drop redundant/explicit `=1` in `-DFOO=1` flags

Quoting the POSIX standard for the `-D` C compiler flag:

  -D  name[=value]

      Define name as if by a C-language #define directive.
      If no `=value` is given, a value of 1 shall be used.
      [...]

Removing this explicit `=1` definition from `-D` flags which are used to
define boolean macro constants makes the CLI invocation a bit more
idiomatic and reduces visual noise in debugging output
(flags containing `=`s are additionally put in single-quotes by GHC)

3 files changed, 19 insertions, 19 deletions

diff --git a/compiler/main/DriverPipeline.hs b/compiler/main/DriverPipeline.hs
index a6a5e1de0b..17a72143b4 100644
--- a/compiler/main/DriverPipeline.hs
+++ b/compiler/main/DriverPipeline.hs
@@ -2001,30 +2001,30 @@ doCpp dflags raw input_fn output_fn = do
                       | otherwise = SysTools.runCc dflags (SysTools.Option "-E" : args)
 
     let target_defs =
-          [ "-D" ++ HOST_OS     ++ "_BUILD_OS=1",
-            "-D" ++ HOST_ARCH   ++ "_BUILD_ARCH=1",
-            "-D" ++ TARGET_OS   ++ "_HOST_OS=1",
-            "-D" ++ TARGET_ARCH ++ "_HOST_ARCH=1" ]
+          [ "-D" ++ HOST_OS     ++ "_BUILD_OS",
+            "-D" ++ HOST_ARCH   ++ "_BUILD_ARCH",
+            "-D" ++ TARGET_OS   ++ "_HOST_OS",
+            "-D" ++ TARGET_ARCH ++ "_HOST_ARCH" ]
         -- remember, in code we *compile*, the HOST is the same our TARGET,
         -- and BUILD is the same as our HOST.
 
     let sse_defs =
-          [ "-D__SSE__=1"    | isSseEnabled    dflags ] ++
-          [ "-D__SSE2__=1"   | isSse2Enabled   dflags ] ++
-          [ "-D__SSE4_2__=1" | isSse4_2Enabled dflags ]
+          [ "-D__SSE__"      | isSseEnabled      dflags ] ++
+          [ "-D__SSE2__"     | isSse2Enabled     dflags ] ++
+          [ "-D__SSE4_2__"   | isSse4_2Enabled   dflags ]
 
     let avx_defs =
-          [ "-D__AVX__=1"  | isAvxEnabled  dflags ] ++
-          [ "-D__AVX2__=1" | isAvx2Enabled dflags ] ++
-          [ "-D__AVX512CD__=1" | isAvx512cdEnabled dflags ] ++
-          [ "-D__AVX512ER__=1" | isAvx512erEnabled dflags ] ++
-          [ "-D__AVX512F__=1"  | isAvx512fEnabled  dflags ] ++
-          [ "-D__AVX512PF__=1" | isAvx512pfEnabled dflags ]
+          [ "-D__AVX__"      | isAvxEnabled      dflags ] ++
+          [ "-D__AVX2__"     | isAvx2Enabled     dflags ] ++
+          [ "-D__AVX512CD__" | isAvx512cdEnabled dflags ] ++
+          [ "-D__AVX512ER__" | isAvx512erEnabled dflags ] ++
+          [ "-D__AVX512F__"  | isAvx512fEnabled  dflags ] ++
+          [ "-D__AVX512PF__" | isAvx512pfEnabled dflags ]
 
     backend_defs <- getBackendDefs dflags
 
 #ifdef GHCI
-    let th_defs = [ "-D__GLASGOW_HASKELL_TH__=1" ]
+    let th_defs = [ "-D__GLASGOW_HASKELL_TH__" ]
 #else
     let th_defs = [ "-D__GLASGOW_HASKELL_TH__=0" ]
 #endif
diff --git a/mk/config.mk.in b/mk/config.mk.in
index fd0bb5167e..e107beac0e 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -647,9 +647,9 @@ ifeq "$(CrossCompiling)" "YES"
 SRC_HSC2HS_OPTS_STAGE1 += --cross-compile
 SRC_HSC2HS_OPTS_STAGE2 += --cross-compile
 endif
-SRC_HSC2HS_OPTS_STAGE0 += --cflag=-D$(HostArch_CPP)_HOST_ARCH=1 --cflag=-D$(HostOS_CPP)_HOST_OS=1
-SRC_HSC2HS_OPTS_STAGE1 += --cflag=-D$(TargetArch_CPP)_HOST_ARCH=1 --cflag=-D$(TargetOS_CPP)_HOST_OS=1
-SRC_HSC2HS_OPTS_STAGE2 += --cflag=-D$(TargetArch_CPP)_HOST_ARCH=1 --cflag=-D$(TargetOS_CPP)_HOST_OS=1
+SRC_HSC2HS_OPTS_STAGE0 += --cflag=-D$(HostArch_CPP)_HOST_ARCH --cflag=-D$(HostOS_CPP)_HOST_OS
+SRC_HSC2HS_OPTS_STAGE1 += --cflag=-D$(TargetArch_CPP)_HOST_ARCH --cflag=-D$(TargetOS_CPP)_HOST_OS
+SRC_HSC2HS_OPTS_STAGE2 += --cflag=-D$(TargetArch_CPP)_HOST_ARCH --cflag=-D$(TargetOS_CPP)_HOST_OS
 
 ifeq "$(TARGETPLATFORM)" "i386-unknown-mingw32"
 WINDRES = $(INPLACE_MINGW)/bin/windres
diff --git a/testsuite/tests/rts/Makefile b/testsuite/tests/rts/Makefile
index 52de19c876..70bcfd4b87 100644
--- a/testsuite/tests/rts/Makefile
+++ b/testsuite/tests/rts/Makefile
@@ -53,14 +53,14 @@ T5423:
 
 define run_T5435_v
 $(RM) T5435_load_v_$(1) T5435_v_$(1)$(exeext)
-'$(TEST_HC)' $(TEST_HC_OPTS) -optc-D$(HostOS)_HOST_OS=1 -v0 -c T5435_$(1).c -o T5435_load_v_$(1).o
+'$(TEST_HC)' $(TEST_HC_OPTS) -optc-D$(HostOS)_HOST_OS -v0 -c T5435_$(1).c -o T5435_load_v_$(1).o
 '$(TEST_HC)' $(TEST_HC_OPTS) -v0 T5435.hs -osuf main_v_$(1)_o -o T5435_v_$(1)$(exeext)
 ./T5435_v_$(1) v ./T5435_load_v_$(1).o
 endef
 
 define run_T5435_dyn
 $(RM) T5435_load_dyn_$(1) T5435_dyn_$(1)$(exeext)
-'$(TEST_HC)' $(filter-out -rtsopts, $(TEST_HC_OPTS)) -optc-D$(HostOS)_HOST_OS=1 -v0 -fPIC -shared -c T5435_$(1).c -osuf dyn_$(1)_o -o T5435_load_dyn_$(1)$(dllext)
+'$(TEST_HC)' $(filter-out -rtsopts, $(TEST_HC_OPTS)) -optc-D$(HostOS)_HOST_OS -v0 -fPIC -shared -c T5435_$(1).c -osuf dyn_$(1)_o -o T5435_load_dyn_$(1)$(dllext)
 '$(TEST_HC)' $(TEST_HC_OPTS) -v0 T5435.hs -osuf main_dyn_$(1)_o -o T5435_dyn_$(1)$(exeext)
 ./T5435_dyn_$(1) dyn ./T5435_load_dyn_$(1)$(dllext)
 endef