build: pass $GCFLAGS to compiler

For example, if you are debugging an optimization
problem you can now run

        GCFLAGS=-N gotest

This is a convention for make, not for the general build,
so it may go away or be done differently in the eventual
'go' command.

The plan is that people will be able to test their code for
rune safety by doing GCFLAGS=-r.

R=golang-dev, bradfitz, lvd
CC=golang-dev
https://golang.org/cl/5294042

3 files changed, 5 insertions, 5 deletions

diff --git a/src/Make.cmd b/src/Make.cmd
index 27c6a2e134..d663edbffc 100644
--- a/src/Make.cmd
+++ b/src/Make.cmd
@@ -20,7 +20,7 @@ $(TARG): _go_.$O
 	$(LD) $(LDIMPORTS) -o $@ _go_.$O
 
 _go_.$O: $(GOFILES) $(PREREQ)
-	$(GC) $(GCIMPORTS) -o $@ $(GOFILES)
+	$(GC) $(GCFLAGS) $(GCIMPORTS) -o $@ $(GOFILES)
 
 install: $(TARGDIR)/$(TARG)
 
@@ -44,7 +44,7 @@ _test/main.a: _gotest_.$O
 	gopack grc $@ _gotest_.$O
 
 _gotest_.$O: $(GOFILES) $(GOTESTFILES)
-	$(GC) $(GCIMPORTS) -o $@ $(GOFILES) $(GOTESTFILES)
+	$(GC) $(GCFLAGS) $(GCIMPORTS) -o $@ $(GOFILES) $(GOTESTFILES)
 
 importpath:
 	echo main
diff --git a/src/Make.pkg b/src/Make.pkg
index ad7d10bebf..6d0ba987f9 100644
--- a/src/Make.pkg
+++ b/src/Make.pkg
@@ -83,10 +83,10 @@ $(TARGDIR)/$(TARG).a: _obj/$(TARG).a
 	cp _obj/$(TARG).a "$@"
 
 _go_.$O: $(GOFILES) $(PREREQ)
-	$(GC) $(GCIMPORTS) -p $(TARG) -o $@ $(GOFILES)
+	$(GC) $(GCFLAGS) $(GCIMPORTS) -p $(TARG) -o $@ $(GOFILES)
 
 _gotest_.$O: $(GOFILES) $(GOTESTFILES) $(PREREQ)
-	$(GC) $(GCIMPORTS) -p $(TARG) -o $@ $(GOFILES) $(GOTESTFILES)
+	$(GC) $(GCFLAGS) $(GCIMPORTS) -p $(TARG) -o $@ $(GOFILES) $(GOTESTFILES)
 
 _obj/$(TARG).a: _go_.$O $(OFILES)
 	@mkdir -p _obj/$(dir)
diff --git a/test/run b/test/run
index 533b0d824b..03c91ee30e 100755
--- a/test/run
+++ b/test/run
@@ -23,7 +23,7 @@ Xarm)
 	exit 1
 esac
 
-export G=${A}g
+export G="${A}g ${GCFLAGS}"
 export L=${A}l
 export GOTRACEBACK=0
 export LANG=C