From e0841316a45656eedefbb639c7b1f2912ec57d68 Mon Sep 17 00:00:00 2001
From: landley <landley@69ca8d6d-28ef-0310-b511-8ec308f3f277>
Date: Wed, 19 Apr 2006 20:32:27 +0000
Subject: svn 14824 broke -funsigned-char and possibly building out of tree,
because $(srcdir) can't bind early since it's set to a different value in
each subdir. If it binds early, it's blank, hence an empty -I which eats the
next option as a directory to look for #include files in.
So CFLAGS has to bind late, but the check_gcc stuff should only get run once.
I added a "make V=2" mode to show when check_gcc gets run, and turned WARNINGS
into a CFLAGS line since it was always getting added anyway.
git-svn-id: svn://busybox.net/trunk/busybox@14923 69ca8d6d-28ef-0310-b511-8ec308f3f277
---
Rules.mak | 38 +++++++++++++++++++++++++-------------
1 file changed, 25 insertions(+), 13 deletions(-)
diff --git a/Rules.mak b/Rules.mak
index 406b97830..d0039b082 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -72,11 +72,14 @@ CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
#GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
-WARNINGS=-Wall -Wstrict-prototypes -Wshadow
-CFLAGS:=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
-
+# This must bind late because srcdir is reset for every source subdirectory.
+CFLAGS=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
+CFLAGS+=$(CHECKED_CFLAGS)
ARFLAGS=cru
+# Warnings
+
+CFLAGS+=-Wall -Wstrict-prototypes -Wshadow
# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
# get the CC MAJOR/MINOR version
@@ -100,8 +103,13 @@ TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
)
endif
-# A nifty macro to make testing gcc features easier
+# A nifty macro to make testing gcc features easier, but note that everything
+# that uses this _must_ use := or it will be re-evaluated for every file.
+ifeq ($(strip $(V)),2)
+VERBOSE_CHECK_GCC=echo check_gcc $(1) >> /dev/stderr;
+endif
check_gcc=$(shell \
+ $(VERBOSE_CHECK_GCC)\
if [ "$(1)" != "" ]; then \
if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
then echo "$(1)"; else echo "$(2)"; fi \
@@ -113,9 +121,13 @@ check_ld=$(shell \
$(LD) --help | grep -q "\$(1)" && echo "-Wl,$(1)" ; \
fi)
-CFLAGS+=$(call check_gcc,-funsigned-char,)
+# Pin CHECKED_CFLAGS with := so it's only evaluated once.
+CHECKED_CFLAGS:=$(call check_gcc,-funsigned-char,)
+CHECKED_CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
+
+# Preemptively pin this too.
+PROG_CFLAGS:=
-CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
#--------------------------------------------------------
# Arch specific compiler optimization stuff should go here.
@@ -189,24 +201,24 @@ else
endif
endif
ifeq ($(strip $(CONFIG_DEBUG)),y)
- CFLAGS +=$(WARNINGS) -g -D_GNU_SOURCE
+ CFLAGS +=-g -D_GNU_SOURCE
LDFLAGS += $(call check_ld,--warn-common,)
else
- CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
+ CFLAGS+=$(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
LDFLAGS += $(call check_ld,--warn-common,)
LDFLAGS += $(call check_ld,--sort-common,)
endif
# warn a bit more verbosely for non-release versions
ifneq ($(EXTRAVERSION),)
- CFLAGS+=$(call check_gcc,-Wstrict-prototypes,)
- CFLAGS+=$(call check_gcc,-Wmissing-prototypes,)
- CFLAGS+=$(call check_gcc,-Wmissing-declarations,)
+ CHECKED_CFLAGS+=$(call check_gcc,-Wstrict-prototypes,)
+ CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-prototypes,)
+ CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-declarations,)
endif
STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
ifeq ($(strip $(CONFIG_STATIC)),y)
PROG_CFLAGS += $(call check_gcc,-static,)
endif
-CFLAGS_SHARED += $(call check_gcc,-shared,)
+CFLAGS_SHARED := $(call check_gcc,-shared,)
LIB_CFLAGS+=$(CFLAGS_SHARED)
ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
@@ -231,7 +243,7 @@ endif
OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
-CFLAGS += $(CROSS_CFLAGS)
+CFLAGS += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
ifdef BB_INIT_SCRIPT
CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
endif
--
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