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build: Support executable only ldflags

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The options is useful to build position-independent executables on
hardened systems (e.g. Android L and Gentoo Hardened).
This commit is contained in:
Luca Barbato 2014-07-16 17:00:11 +02:00
parent b396bbad10
commit bb0babd705
4 changed files with 15 additions and 3 deletions
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4
Makefile
View File

@ -104,7 +104,7 @@ FF_DEP_LIBS := $(DEP_LIBS)
all: $(AVPROGS) all: $(AVPROGS)
$(TOOLS): %$(EXESUF): %.o $(EXEOBJS) $(TOOLS): %$(EXESUF): %.o $(EXEOBJS)
$(LD) $(LDFLAGS) $(LD_O) $^ $(ELIBS) $(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS)
tools/cws2fws$(EXESUF): ELIBS = $(ZLIB) tools/cws2fws$(EXESUF): ELIBS = $(ZLIB)
@ -149,7 +149,7 @@ endef
$(foreach P,$(PROGS),$(eval $(call DOPROG,$(P:$(EXESUF)=)))) $(foreach P,$(PROGS),$(eval $(call DOPROG,$(P:$(EXESUF)=))))
$(PROGS): %$(EXESUF): %.o $(FF_DEP_LIBS) $(PROGS): %$(EXESUF): %.o $(FF_DEP_LIBS)
$(LD) $(LDFLAGS) $(LD_O) $(OBJS-$*) $(FF_EXTRALIBS) $(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $(OBJS-$*) $(FF_EXTRALIBS)
OBJDIRS += tools OBJDIRS += tools

9
configure vendored
View File

@ -244,6 +244,7 @@ Toolchain options:
--host-os=OS compiler host OS [$target_os] --host-os=OS compiler host OS [$target_os]
--extra-cflags=ECFLAGS add ECFLAGS to CFLAGS [$CFLAGS] --extra-cflags=ECFLAGS add ECFLAGS to CFLAGS [$CFLAGS]
--extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS] --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]
--extra-ldexeflags=ELDFLAGS add ELDFLAGS to LDEXEFLAGS [$LDEXEFLAGS]
--extra-libs=ELIBS add ELIBS [$ELIBS] --extra-libs=ELIBS add ELIBS [$ELIBS]
--extra-version=STRING version string suffix [] --extra-version=STRING version string suffix []
--optflags=OPTFLAGS override optimization-related compiler flags --optflags=OPTFLAGS override optimization-related compiler flags
@ -679,6 +680,10 @@ add_ldflags(){
append LDFLAGS $($ldflags_filter "$@") append LDFLAGS $($ldflags_filter "$@")
} }
add_ldexeflags(){
append LDEXEFLAGS $($ldflags_filter "$@")
}
add_stripflags(){ add_stripflags(){
append STRIPFLAGS "$@" append STRIPFLAGS "$@"
} }
@ -2356,6 +2361,9 @@ for opt do
--extra-ldflags=*) --extra-ldflags=*)
add_ldflags $optval add_ldflags $optval
;; ;;
--extra-ldexeflags=*)
add_ldexeflags $optval
;;
--extra-libs=*) --extra-libs=*)
add_extralibs $optval add_extralibs $optval
;; ;;
@ -4575,6 +4583,7 @@ LD_LIB=$LD_LIB
LD_PATH=$LD_PATH LD_PATH=$LD_PATH
DLLTOOL=$dlltool DLLTOOL=$dlltool
LDFLAGS=$LDFLAGS LDFLAGS=$LDFLAGS
LDEXEFLAGS=$LDEXEFLAGS
SHFLAGS=$(echo $($ldflags_filter $SHFLAGS)) SHFLAGS=$(echo $($ldflags_filter $SHFLAGS))
STRIPFLAGS=$STRIPFLAGS STRIPFLAGS=$STRIPFLAGS
YASMFLAGS=$YASMFLAGS YASMFLAGS=$YASMFLAGS

3
doc/platform.texi
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@ -35,6 +35,9 @@ to your project LDFLAGS:
-Wl,-Bsymbolic -Wl,-Bsymbolic
@end example @end example
If your target platform requires position independent binaries, you should
pass the correct linking flag (e.g. @code{-pie}) to @code{--extra-ldexeflags}.
@section BSD @section BSD
BSD make will not build Libav, you need to install and use GNU Make BSD make will not build Libav, you need to install and use GNU Make

2
library.mak
View File

@ -46,7 +46,7 @@ $(TOOLS): THISLIB = $(FULLNAME:%=$(LD_LIB))
$(TESTPROGS): THISLIB = $(SUBDIR)$(LIBNAME) $(TESTPROGS): THISLIB = $(SUBDIR)$(LIBNAME)
$(TESTPROGS) $(TOOLS): %$(EXESUF): %.o $(EXEOBJS) $(TESTPROGS) $(TOOLS): %$(EXESUF): %.o $(EXEOBJS)
$$(LD) $(LDFLAGS) $$(LD_O) $$(filter %.o,$$^) $$(THISLIB) $(FFEXTRALIBS) $$(ELIBS) $$(LD) $(LDFLAGS) $(LDEXEFLAGS) $$(LD_O) $$(filter %.o,$$^) $$(THISLIB) $(FFEXTRALIBS) $$(ELIBS)
$(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR) $(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR)
$(Q)cd ./$(SUBDIR) && $(LN_S) $(SLIBNAME_WITH_MAJOR) $(SLIBNAME) $(Q)cd ./$(SUBDIR) && $(LN_S) $(SLIBNAME_WITH_MAJOR) $(SLIBNAME)