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@ -415,9 +415,9 @@ LDFLAGS.so += $(hashstyle-LDFLAGS) |
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LDFLAGS-rtld += $(hashstyle-LDFLAGS) |
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endif |
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# Command for linking programs with the C library. |
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# Commands for linking programs with the C library. |
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ifndef +link |
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+link = $(CC) -nostdlib -nostartfiles -o $@ \ |
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+link-before-libc = $(CC) -nostdlib -nostartfiles -o $@ \ |
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$(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \ |
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$(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \ |
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$(addprefix $(csu-objpfx),$(start-installed-name)) \ |
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@ -426,7 +426,10 @@ ifndef +link |
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$(start-installed-name))\ |
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$(+preinit) $(link-extra-libs) \ |
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$(common-objpfx)libc% $(+postinit),$^) \ |
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$(link-extra-libs) $(link-libc) $(+postctor) $(+postinit) |
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$(link-extra-libs) |
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+link-after-libc = $(+postctor) $(+postinit) |
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+link = $(+link-before-libc) $(link-libc) $(+link-after-libc) |
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+link-tests = $(+link-before-libc) $(link-libc-tests) $(+link-after-libc) |
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endif |
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# Command for linking PIE programs with the C library. |
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ifndef +link-pie |
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@ -443,7 +446,7 @@ ifndef +link-pie |
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endif |
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# Command for statically linking programs with the C library. |
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ifndef +link-static |
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+link-static = $(CC) -nostdlib -nostartfiles -static -o $@ \ |
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+link-static-before-libc = $(CC) -nostdlib -nostartfiles -static -o $@ \ |
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$(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \ |
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$(addprefix $(csu-objpfx),$(static-start-installed-name)) \ |
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$(+preinit) $(+prector) \ |
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@ -451,7 +454,12 @@ ifndef +link-static |
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$(start-installed-name))\ |
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$(+preinit) $(link-extra-libs-static) \ |
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$(common-objpfx)libc% $(+postinit),$^) \ |
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$(link-extra-libs-static) $(link-libc-static) $(+postctor) $(+postinit) |
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$(link-extra-libs-static) $(link-libc-static) |
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+link-static-after-libc = $(+postctor) $(+postinit) |
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+link-static = $(+link-static-before-libc) $(link-libc-static) \ |
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$(+link-static-after-libc) |
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+link-static-tests = $(+link-static-before-libc) $(link-libc-static-tests) \ |
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$(+link-static-after-libc) |
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endif |
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# Command for statically linking bounded-pointer programs with the C library. |
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ifndef +link-bounded |
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@ -475,10 +483,12 @@ ifeq (yes,$(build-shared)) |
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# We need the versioned name of libc.so in the deps of $(others) et al |
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# so that the symlink to libc.so is created before anything tries to |
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# run the linked programs. |
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link-libc = -Wl,-rpath-link=$(rpath-link) \ |
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link-libc-before-gnulib = -Wl,-rpath-link=$(rpath-link) \ |
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$(common-objpfx)libc.so$(libc.so-version) \ |
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$(common-objpfx)$(patsubst %,$(libtype.oS),c) \ |
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$(as-needed) $(common-objpfx)elf/ld.so $(no-as-needed) $(gnulib) |
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$(as-needed) $(common-objpfx)elf/ld.so $(no-as-needed) |
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link-libc = $(link-libc-before-gnulib) $(gnulib) |
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link-libc-tests = $(link-libc-before-gnulib) $(gnulib-tests) |
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# This is how to find at build-time things that will be installed there. |
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rpath-dirs = math elf dlfcn nss nis rt resolv crypt |
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rpath-link = \ |
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@ -488,6 +498,7 @@ else |
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nssobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)nss) |
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resolvobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)resolv) |
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link-libc = $(common-objpfx)libc.a $(otherlibs) $(gnulib) $(common-objpfx)libc.a $(gnulib) |
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link-libc-tests = $(common-objpfx)libc.a $(otherlibs) $(gnulib-tests) $(common-objpfx)libc.a $(gnulib-tests) |
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endif |
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endif |
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@ -513,8 +524,43 @@ endif |
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# The static libraries. |
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link-libc-static = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib) -Wl,--end-group |
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link-libc-static-tests = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib-tests) -Wl,--end-group |
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link-libc-bounded = $(common-objpfx)libc_b.a $(gnulib) $(common-objpfx)libc_b.a |
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# How to link against libgcc. Some libgcc functions, such as those |
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# for "long long" arithmetic or software floating point, can always be |
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# built without use of C library headers and do not have any global |
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# state so can safely be linked statically into any executable or |
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# shared library requiring them; these functions are in libgcc.a. |
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# Other functions, relating to exception handling, may require C |
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# library headers to build and it may not be safe to have more than |
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# one copy of them in a process; these functions are only in |
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# libgcc_s.so and libgcc_eh.a. |
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# |
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# To avoid circular dependencies when bootstrapping, it is desirable |
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# to avoid use of libgcc_s and libgcc_eh in building glibc. Where any |
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# glibc functionality (in particular, thread cancellation) requires |
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# exception handling, this is implemented through dlopen of libgcc_s |
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# to avoid unnecessary dependencies on libgcc_s by programs not using |
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# that functionality; executables built with glibc do not use |
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# exception handling other than through thread cancellation. |
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# |
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# Undefined references to functions from libgcc_eh or libgcc_s may |
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# arise for code built with -fexceptions. In the case of statically |
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# linked programs installed by glibc, unwinding will never actually |
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# occur at runtime and the use of elf/static-stubs.c to resolve these |
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# references is safe. In the case of statically linked test programs |
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# and test programs built with -fexceptions, unwinding may occur in |
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# some cases and it is preferable to link with libgcc_eh or libgcc_s |
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# so that the testing is as similar as possible to how programs will |
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# be built with the installed glibc. |
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# |
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# Some architectures have architecture-specific systems for exception |
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# handling that may involve undefined references to |
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# architecture-specific functions. On those architectures, |
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# gnulib-arch and static-gnulib-arch may be defined in sysdeps |
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# makefiles to use additional libraries for linking executables and |
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# shared libraries built by glibc. |
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ifndef gnulib |
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ifneq ($(have-cc-with-libunwind),yes) |
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libunwind = |
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@ -522,8 +568,12 @@ else |
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libunwind = -lunwind |
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endif |
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libgcc_eh := -Wl,--as-needed -lgcc_s $(libunwind) -Wl,--no-as-needed |
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gnulib := -lgcc $(libgcc_eh) |
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static-gnulib := -lgcc -lgcc_eh $(libunwind) |
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gnulib-arch = |
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gnulib = -lgcc $(gnulib-arch) |
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gnulib-tests := -lgcc $(libgcc_eh) |
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static-gnulib-arch = |
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static-gnulib = -lgcc $(static-gnulib-arch) |
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static-gnulib-tests := -lgcc -lgcc_eh $(libunwind) |
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libc.so-gnulib := -lgcc |
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endif |
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+preinit = $(addprefix $(csu-objpfx),crti.o) |
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Joseph Myers
14 years ago