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From dcbfaf57a213e3beaafb0561b007c61501961f03 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 c49da99d395..35f712e2c84 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -2025,6 +2025,10 @@ 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 0ab63bcd211..7b081e9e4f0 100644
--- a/gcc/cp/g++spec.c
+++ b/gcc/cp/g++spec.c
@@ -137,6 +137,7 @@ 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 cd31b522e42..1f14df48bda 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -230,6 +230,9 @@ 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
-Wabi-tag -Wcatch-value -Wcatch-value=@var{n} @gol
-Wno-class-conversion -Wclass-memaccess @gol
@@ -600,7 +603,7 @@ 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}}
@@ -14468,6 +14471,33 @@ 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 f379f71da3d..1ee962acfaa 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -1051,6 +1051,7 @@ 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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