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- From 57e2c5e35732988c0b287289eb0997b4e9769371 Mon Sep 17 00:00:00 2001
- From: Khem Raj <raj.khem@gmail.com>
- Date: Fri, 29 Mar 2013 09:12:56 +0400
- Subject: [PATCH] optional libstdc
- gcc-runtime builds libstdc++ separately from gcc-cross-*. Its configure tests using g++
- will not run correctly since by default the linker will try to link against libstdc++
- which shouldn't exist yet. We need an option to disable -lstdc++
- option whilst leaving -lc, -lgcc and other automatic library dependencies added by gcc
- driver. This patch adds such an option which only disables the -lstdc++.
- A "standard" gcc build uses xgcc and hence avoids this. We should ask upstream how to
- do this officially, the likely answer is don't build libstdc++ separately.
- RP 29/6/10
- Signed-off-by: Khem Raj <raj.khem@gmail.com>
- Upstream-Status: Inappropriate [embedded specific]
- ---
- gcc/c-family/c.opt | 4 ++++
- gcc/cp/g++spec.c | 1 +
- gcc/doc/invoke.texi | 32 +++++++++++++++++++++++++++++++-
- gcc/gcc.c | 1 +
- 4 files changed, 37 insertions(+), 1 deletion(-)
- diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
- index 64e46e7573e..1824380f27a 100644
- --- a/gcc/c-family/c.opt
- +++ b/gcc/c-family/c.opt
- @@ -2166,6 +2166,10 @@ nostdinc++
- C++ ObjC++
- Do not search standard system include directories for C++.
-
- +nostdlib++
- +Driver
- +Do not link standard C++ runtime library
- +
- o
- C ObjC C++ ObjC++ Joined Separate
- ; Documented in common.opt
- diff --git a/gcc/cp/g++spec.c b/gcc/cp/g++spec.c
- index 3c9bd1490b4..818beb61cee 100644
- --- a/gcc/cp/g++spec.c
- +++ b/gcc/cp/g++spec.c
- @@ -159,6 +159,7 @@ lang_specific_driver (struct cl_decoded_option **in_decoded_options,
- switch (decoded_options[i].opt_index)
- {
- case OPT_nostdlib:
- + case OPT_nostdlib__:
- case OPT_nodefaultlibs:
- library = -1;
- break;
- diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
- index 6659a903bf0..9ee63dbe52f 100644
- --- a/gcc/doc/invoke.texi
- +++ b/gcc/doc/invoke.texi
- @@ -239,6 +239,9 @@ in the following sections.
- -fno-weak -nostdinc++ @gol
- -fvisibility-inlines-hidden @gol
- -fvisibility-ms-compat @gol
- +-fvtable-verify=@r{[}std@r{|}preinit@r{|}none@r{]} @gol
- +-fvtv-counts -fvtv-debug @gol
- +-nostdlib++ @gol
- -fext-numeric-literals @gol
- -flang-info-include-translate@r{[}=@var{header}@r{]} @gol
- -flang-info-include-translate-not @gol
- @@ -632,7 +635,7 @@ Objective-C and Objective-C++ Dialects}.
- -pie -pthread -r -rdynamic @gol
- -s -static -static-pie -static-libgcc -static-libstdc++ @gol
- -static-libasan -static-libtsan -static-liblsan -static-libubsan @gol
- --shared -shared-libgcc -symbolic @gol
- +-shared -shared-libgcc -symbolic -nostdlib++ @gol
- -T @var{script} -Wl,@var{option} -Xlinker @var{option} @gol
- -u @var{symbol} -z @var{keyword}}
-
- @@ -15708,6 +15711,33 @@ Specify that the program entry point is @var{entry}. The argument is
- interpreted by the linker; the GNU linker accepts either a symbol name
- or an address.
-
- +@item -nostdlib++
- +@opindex nostdlib++
- +Do not use the standard system C++ runtime libraries when linking.
- +Only the libraries you specify will be passed to the linker.
- +
- +@cindex @option{-lgcc}, use with @option{-nostdlib}
- +@cindex @option{-nostdlib} and unresolved references
- +@cindex unresolved references and @option{-nostdlib}
- +@cindex @option{-lgcc}, use with @option{-nodefaultlibs}
- +@cindex @option{-nodefaultlibs} and unresolved references
- +@cindex unresolved references and @option{-nodefaultlibs}
- +One of the standard libraries bypassed by @option{-nostdlib} and
- +@option{-nodefaultlibs} is @file{libgcc.a}, a library of internal subroutines
- +which GCC uses to overcome shortcomings of particular machines, or special
- +needs for some languages.
- +(@xref{Interface,,Interfacing to GCC Output,gccint,GNU Compiler
- +Collection (GCC) Internals},
- +for more discussion of @file{libgcc.a}.)
- +In most cases, you need @file{libgcc.a} even when you want to avoid
- +other standard libraries. In other words, when you specify @option{-nostdlib}
- +or @option{-nodefaultlibs} you should usually specify @option{-lgcc} as well.
- +This ensures that you have no unresolved references to internal GCC
- +library subroutines.
- +(An example of such an internal subroutine is @code{__main}, used to ensure C++
- +constructors are called; @pxref{Collect2,,@code{collect2}, gccint,
- +GNU Compiler Collection (GCC) Internals}.)
- +
- @item -pie
- @opindex pie
- Produce a dynamically linked position independent executable on targets
- diff --git a/gcc/gcc.c b/gcc/gcc.c
- index 19c75b6e20d..be7630ffd8c 100644
- --- a/gcc/gcc.c
- +++ b/gcc/gcc.c
- @@ -1162,6 +1162,7 @@ proper position among the other output files. */
- %(mflib) " STACK_SPLIT_SPEC "\
- %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} " SANITIZER_SPEC " \
- %{!nostdlib:%{!r:%{!nodefaultlibs:%(link_ssp) %(link_gcc_c_sequence)}}}\
- + %{!nostdlib++:}\
- %{!nostdlib:%{!r:%{!nostartfiles:%E}}} %{T*} \n%(post_link) }}}}}}"
- #endif
-
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