Fix #4829 (build does not respect --with-gcc option)

[ghc-hetmet.git] / rts / ghc.mk

diff --git a/rts/ghc.mk b/rts/ghc.mk
index 0c224e9..8825219 100644 (file)
--- a/rts/ghc.mk
+++ b/rts/ghc.mk
@@ -460,9 +460,14 @@ ifeq "$(HaveDtrace)" "YES"
 rts_CC_OPTS            += -DDTRACE
 rts_HC_OPTS            += -DDTRACE
 
+# Apple's dtrace (the only one supported by ghc at the moment) uses
+# gcc as its preprocessor. If gcc isn't at /usr/bin/gcc, or we need
+# to force it to use a different gcc, we need to give the path in
+# the option cpppath.
+
 DTRACEPROBES_SRC = rts/RtsProbes.d
 $(DTRACEPROBES_H): $(DTRACEPROBES_SRC) includes/ghcplatform.h | $(dir $@)/.
-       "$(DTRACE)" $(filter -I%,$(rts_CC_OPTS)) -C -h -o $@ -s $<
+       "$(DTRACE)" $(filter -I%,$(rts_CC_OPTS)) -C -x cpppath=$(WhatGccIsCalled) -h -o $@ -s $<
 
 endif