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authorGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-01-27 15:45:56 +0000
committerGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-01-27 15:45:56 +0000
commit08a1b5095d710c5d905056a9daa14a1acad5590b (patch)
tree2b3632bc1361c718d8f80b7c95240730b7f52d71 /Rules.mak
parent79af7d5debe2f40ca1128975167243d4bb00fb51 (diff)
downloadbusybox-08a1b5095d710c5d905056a9daa14a1acad5590b.tar.gz
busybox-08a1b5095d710c5d905056a9daa14a1acad5590b.tar.bz2
- add a macro to check for ld and as flags
Very unreliable as e.g the ld check will see the flags supported by each emulation, not just the active one. good enough for now.. Fix would be to crate one or more dummy .c files and accually try if a flag works.
Diffstat (limited to 'Rules.mak')
-rw-r--r--Rules.mak32
1 files changed, 26 insertions, 6 deletions
diff --git a/Rules.mak b/Rules.mak
index 8652b00f4..335cb3664 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -115,6 +115,20 @@ check_gcc=$(shell \
then echo "$(1)"; else echo "$(2)"; fi \
fi)
+# A not very robust macro to check for available ld flags
+check_ld=$(shell \
+ echo "checking='$(1)'" >> foo.txt ; \
+ if [ "x$(1)" != "x" ]; then \
+ $(LD) --help | grep -q \\$(1) && echo "-Wl,$(1)$(2)" ; \
+ fi)
+
+# A not very robust macro to check for available as flags
+check_as=$(shell \
+ if [ "x$(1)" != "x" ]; then \
+ $(AS) --help | grep -q "\\$(1)" && echo "-Wa,$(1)$(2)" ; \
+ fi)
+
+
# Setup some shortcuts so that silent mode is silent like it should be
ifeq ($(subst s,,$(MAKEFLAGS)),$(MAKEFLAGS))
export MAKE_IS_SILENT=n
@@ -145,10 +159,15 @@ OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
endif # CONFIG_BUILD_AT_ONCE
+LIB_LDFLAGS:=$(call check_ld,--enable-new-dtags,)
+#LIB_LDFLAGS+=$(call check_ld,--reduce-memory-overheads,)
+#LIB_LDFLAGS+=$(call check_ld,--as-needed,)
+#LIB_LDFLAGS+=$(call check_ld,--warn-shared-textrel,)
+
+
# Some nice architecture specific optimizations
ifeq ($(strip $(TARGET_ARCH)),arm)
OPTIMIZATION+=-fstrict-aliasing
- OPTIMIZATION+=$(call check_gcc,-msingle-pic-base,)
endif
ifeq ($(strip $(TARGET_ARCH)),i386)
OPTIMIZATION+=$(call check_gcc,-march=i386,)
@@ -169,7 +188,7 @@ ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,)
endif # gcc-4.1 and beyond
endif
-OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer
+OPTIMIZATIONS:=$(OPTIMIZATION) $(call check_gcc,-fomit-frame-pointer,)
#
#--------------------------------------------------------
@@ -195,21 +214,22 @@ else
endif
ifeq ($(strip $(CONFIG_DEBUG)),y)
CFLAGS +=$(WARNINGS) -g -D_GNU_SOURCE
- LDFLAGS +=-Wl,-warn-common
+ LDFLAGS += $(call check_ld,-warn-common,)
STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
else
CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
- LDFLAGS += -Wl,-warn-common -Wl,--sort-common
+ LDFLAGS += $(call check_ld,-warn-common,)
+ LDFLAGS += $(call check_ld,--sort-common,)
STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
endif
ifeq ($(strip $(CONFIG_STATIC)),y)
- LDFLAGS += --static
+ LDFLAGS += $(call check_ld,--static,)
#else
# LIBRARIES += -ldl
endif
ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
- CFLAGS_PIC:= -fPIC #-DPIC
+ CFLAGS_PIC:= $(call check_gcc,-fPIC,)
endif
ifeq ($(strip $(CONFIG_SELINUX)),y)