Fix and document -r option

The option has existed and been working for years,
make sure it implies the right extra options, and list
it in the documentation.

2018-09-20  Allan Sandfeld Jensen  <allan.jensen@qt.io>

gcc/
	* gcc.c (LINK_COMMAND_SPEC): Handle -r like -nostdlib.
	(VTABLE_VERIFICATION_SPEC): Likewise.
	(SANITIZER_EARLY_SPEC): Likewise.
	(SANITIZER_SPEC): Likewise.
	* config/darwin.h (LINK_COMMAND_SPEC): Likewise.
	* doc/invoke.texi (Link Options): Document -r.

gcc/cp/
	* g++spec.c (lang_specific_driver): Handle -r like -nostdlib.

gcc/fortran/
	* gfortranspec.c (lang_specific_driver): Handle -r like -nostdlib.

gcc/go/
	* gospec.c (lang_specific_driver): Handle -r like -nostdlib.

gcc/testsuite/
	* g++.dg/ipa/pr64059.C: Removed now redundant -nostdlib.
	* g++.dg/lto/20081109-1_0.C: Likewise.
	* g++.dg/lto/20090302_0.C: Likewise.
	* g++.dg/lto/pr45621_0.C: Likewise.
	* g++.dg/lto/pr60567_0.C: Likewise.
	* g++.dg/lto/pr62026.C: Likewise.
	* gcc.dg/lto/pr45736_0.c: Likewise.
	* gcc.dg/lto/pr52634_0.c: Likewise.
	* gfortran.dg/lto/20091016-1_0.f90: Likewise.
	* gfortran.dg/lto/pr79108_0.f90: Likewise.

From-SVN: r264451

gcc/ChangeLog

+2018-09-20  Allan Sandfeld Jensen  <allan.jensen@qt.io>
+
+	* gcc.c (LINK_COMMAND_SPEC): Handle -r like -nostdlib.
+	(VTABLE_VERIFICATION_SPEC): Likewise.
+	(SANITIZER_EARLY_SPEC): Likewise.
+	(SANITIZER_SPEC): Likewise.
+	* config/darwin.h (LINK_COMMAND_SPEC): Likewise.
+	* doc/invoke.texi (Link Options): Document -r.
+
 2018-09-20  Richard Biener <rguenther@suse.de>
 
 	PR middle-end/87054

gcc/config/darwin.h

@@ -180,20 +180,20 @@ extern GTY(()) int darwin_ms_struct;
    "%X %{s} %{t} %{Z} %{u*} \
     %{e*} %{r} \
     %{o*}%{!o:-o a.out} \
-    %{!nostdlib:%{!nostartfiles:%S}} \
+    %{!nostdlib:%{!r:%{!nostartfiles:%S}}} \
     %{L*} %(link_libgcc) %o %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} \
     %{fopenacc|fopenmp|%:gt(%{ftree-parallelize-loops=*:%*} 1): \
       %{static|static-libgcc|static-libstdc++|static-libgfortran: libgomp.a%s; : -lgomp } } \
     %{fgnu-tm: \
       %{static|static-libgcc|static-libstdc++|static-libgfortran: libitm.a%s; : -litm } } \
-    %{!nostdlib:%{!nodefaultlibs:\
+    %{!nostdlib:%{!r:%{!nodefaultlibs:\
       %{%:sanitize(address): -lasan } \
       %{%:sanitize(undefined): -lubsan } \
       %(link_ssp) \
       " DARWIN_EXPORT_DYNAMIC " %<rdynamic \
       %(link_gcc_c_sequence) \
-    }}\
-    %{!nostdlib:%{!nostartfiles:%E}} %{T*} %{F*} }}}}}}}"
+    }}}\
+    %{!nostdlib:%{!r:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}"
 
 #define DSYMUTIL "\ndsymutil"
 

gcc/cp/ChangeLog

+2018-09-20  Allan Sandfeld Jensen  <allan.jensen@qt.io>
+
+	* g++spec.c (lang_specific_driver): Handle -r like -nostdlib.
+
 2018-09-20  Jason Merrill  <jason@redhat.com>
 
 	PR c++/87075 - ICE with constexpr array initialization.

gcc/cp/g++spec.c

@@ -184,6 +184,7 @@ lang_specific_driver (struct cl_decoded_option **in_decoded_options,
 	  break;
 
 	case OPT_c:
+	case OPT_r:
 	case OPT_S:
 	case OPT_E:
 	case OPT_M:

gcc/doc/invoke.texi

@@ -521,7 +521,7 @@ Objective-C and Objective-C++ Dialects}.
 @xref{Link Options,,Options for Linking}.
 @gccoptlist{@var{object-file-name}  -fuse-ld=@var{linker}  -l@var{library} @gol
 -nostartfiles  -nodefaultlibs  -nolibc  -nostdlib @gol
--pie  -pthread  -rdynamic @gol
+-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
@@ -12586,6 +12586,11 @@ x86 Cygwin and MinGW targets.  On some targets this option also sets
 flags for the preprocessor, so it should be used consistently for both
 compilation and linking.
 
+@item -r
+@opindex r
+Produce a relocatable object as output.  This is also known as partial
+linking.
+
 @item -rdynamic
 @opindex rdynamic
 Pass the flag @option{-export-dynamic} to the ELF linker, on targets

gcc/fortran/ChangeLog

+2018-09-20  Allan Sandfeld Jensen  <allan.jensen@qt.io>
+
+	* gfortranspec.c (lang_specific_driver): Handle -r like -nostdlib.
+
 2018-09-20  Janus Weil  <janus@gcc.gnu.org>
 
 	* gfortran.h (gfc_str_startswith): New macro.

gcc/fortran/gfortranspec.c

@@ -243,6 +243,7 @@ lang_specific_driver (struct cl_decoded_option **in_decoded_options,
 	case OPT_nostdlib:
 	case OPT_nodefaultlibs:
 	case OPT_c:
+	case OPT_r:
 	case OPT_S:
 	case OPT_fsyntax_only:
 	case OPT_E:

gcc/gcc.c

@@ -980,20 +980,20 @@ proper position among the other output files.  */
 /* Linker command line options for -fsanitize= early on the command line.  */
 #ifndef SANITIZER_EARLY_SPEC
 #define SANITIZER_EARLY_SPEC "\
-%{!nostdlib:%{!nodefaultlibs:%{%:sanitize(address):" LIBASAN_EARLY_SPEC "} \
+%{!nostdlib:%{!r:%{!nodefaultlibs:%{%:sanitize(address):" LIBASAN_EARLY_SPEC "} \
     %{%:sanitize(thread):" LIBTSAN_EARLY_SPEC "} \
-    %{%:sanitize(leak):" LIBLSAN_EARLY_SPEC "}}}"
+    %{%:sanitize(leak):" LIBLSAN_EARLY_SPEC "}}}}"
 #endif
 
 /* Linker command line options for -fsanitize= late on the command line.  */
 #ifndef SANITIZER_SPEC
 #define SANITIZER_SPEC "\
-%{!nostdlib:%{!nodefaultlibs:%{%:sanitize(address):" LIBASAN_SPEC "\
+%{!nostdlib:%{!r:%{!nodefaultlibs:%{%:sanitize(address):" LIBASAN_SPEC "\
     %{static:%ecannot specify -static with -fsanitize=address}}\
     %{%:sanitize(thread):" LIBTSAN_SPEC "\
     %{static:%ecannot specify -static with -fsanitize=thread}}\
     %{%:sanitize(undefined):" LIBUBSAN_SPEC "}\
-    %{%:sanitize(leak):" LIBLSAN_SPEC "}}}"
+    %{%:sanitize(leak):" LIBLSAN_SPEC "}}}}"
 #endif
 
 #ifndef POST_LINK_SPEC
@@ -1007,8 +1007,8 @@ proper position among the other output files.  */
 #ifndef VTABLE_VERIFICATION_SPEC
 #if ENABLE_VTABLE_VERIFY
 #define VTABLE_VERIFICATION_SPEC "\
-%{!nostdlib:%{fvtable-verify=std: -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end}\
-    %{fvtable-verify=preinit: -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end}}"
+%{!nostdlib:%{!r:%{fvtable-verify=std: -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end}\
+    %{fvtable-verify=preinit: -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end}}}"
 #else
 #define VTABLE_VERIFICATION_SPEC "\
 %{fvtable-verify=none:} \
@@ -1040,7 +1040,7 @@ proper position among the other output files.  */
     %{flto} %{fno-lto} %{flto=*} %l " LINK_PIE_SPEC \
    "%{fuse-ld=*:-fuse-ld=%*} " LINK_COMPRESS_DEBUG_SPEC \
    "%X %{o*} %{e*} %{N} %{n} %{r}\
-    %{s} %{t} %{u*} %{z} %{Z} %{!nostdlib:%{!nostartfiles:%S}} \
+    %{s} %{t} %{u*} %{z} %{Z} %{!nostdlib:%{!r:%{!nostartfiles:%S}}} \
     %{static|no-pie|static-pie:} %@{L*} %(mfwrap) %(link_libgcc) " \
     VTABLE_VERIFICATION_SPEC " " SANITIZER_EARLY_SPEC " %o "" \
     %{fopenacc|fopenmp|%:gt(%{ftree-parallelize-loops=*:%*} 1):\
@@ -1048,8 +1048,8 @@ proper position among the other output files.  */
     %{fgnu-tm:%:include(libitm.spec)%(link_itm)}\
     %(mflib) " STACK_SPLIT_SPEC "\
     %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} " SANITIZER_SPEC " \
-    %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %(link_gcc_c_sequence)}}\
-    %{!nostdlib:%{!nostartfiles:%E}} %{T*}  \n%(post_link) }}}}}}"
+    %{!nostdlib:%{!r:%{!nodefaultlibs:%(link_ssp) %(link_gcc_c_sequence)}}}\
+    %{!nostdlib:%{!r:%{!nostartfiles:%E}}} %{T*}  \n%(post_link) }}}}}}"
 #endif
 
 #ifndef LINK_LIBGCC_SPEC

gcc/go/ChangeLog

+2018-09-20  Allan Sandfeld Jensen  <allan.jensen@qt.io>
+
+	* gospec.c (lang_specific_driver): Handle -r like -nostdlib.
+
 2018-08-27  Martin Liska  <mliska@suse.cz>
 
 	* go-gcc.cc (Gcc_backend::call_expression): Use new function

gcc/go/gospec.c

@@ -139,6 +139,7 @@ lang_specific_driver (struct cl_decoded_option **in_decoded_options,
 
       switch (decoded_options[i].opt_index)
 	{
+	case OPT_r:
 	case OPT_nostdlib:
 	case OPT_nodefaultlibs:
 	  library = -1;

gcc/testsuite/ChangeLog

+2018-09-20  Allan Sandfeld Jensen  <allan.jensen@qt.io>
+
+	* g++.dg/ipa/pr64059.C: Removed now redundant -nostdlib.
+	* g++.dg/lto/20081109-1_0.C: Likewise.
+	* g++.dg/lto/20090302_0.C: Likewise.
+	* g++.dg/lto/pr45621_0.C: Likewise.
+	* g++.dg/lto/pr60567_0.C: Likewise.
+	* g++.dg/lto/pr62026.C: Likewise.
+	* gcc.dg/lto/pr45736_0.c: Likewise.
+	* gcc.dg/lto/pr52634_0.c: Likewise.
+	* gfortran.dg/lto/20091016-1_0.f90: Likewise.
+	* gfortran.dg/lto/pr79108_0.f90: Likewise.
+
 2018-09-20  Alexandre Oliva <oliva@adacore.com>
 
 	PR middle-end/87054

gcc/testsuite/g++.dg/ipa/pr64059.C

-// { dg-options "-r -nostdlib -O2 -flto -fno-devirtualize" }
+// { dg-options "-r -O2 -flto -fno-devirtualize" }
 // { dg-require-effective-target lto }
 
 class A;

gcc/testsuite/g++.dg/lto/20081109-1_0.C

 // { dg-lto-do link }
 // { dg-require-effective-target fpic }
 // { dg-lto-options {{-fPIC -flto -flto-partition=1to1}} }
-// { dg-extra-ld-options "-fPIC -flto -flto-partition=1to1 -r -nostdlib -fno-exceptions -flinker-output=nolto-rel" }
+// { dg-extra-ld-options "-fPIC -flto -flto-partition=1to1 -r -fno-exceptions -flinker-output=nolto-rel" }
 void func(); class Foo { };
 void bar() { try { func(); } catch (Foo) { } };

gcc/testsuite/g++.dg/lto/20090302_0.C

 /* { dg-lto-do link } */
 /* { dg-require-effective-target fpic } */
-/* { dg-lto-options {{-fPIC -flto -flto-partition=1to1 -r -nostdlib}} } */
+/* { dg-lto-options {{-fPIC -flto -flto-partition=1to1 -r}} } */
 /* { dg-extra-ld-options "-flinker-output=nolto-rel" } */
 struct Foo {
   bool Mumble();

gcc/testsuite/g++.dg/lto/pr45621_0.C

 // { dg-lto-do assemble }
-// { dg-extra-ld-options "-O2 -fipa-cp-clone -flto -nostdlib -r -flinker-output=nolto-rel" }
+// { dg-extra-ld-options "-O2 -fipa-cp-clone -flto -r -flinker-output=nolto-rel" }
 #include "pr45621.h"
 
 void

gcc/testsuite/g++.dg/lto/pr60567_0.C

 // PR lto/60567
 // { dg-lto-do link }
 // { dg-lto-options { { -flto -fno-use-linker-plugin } } }
-// { dg-extra-ld-options "-r -nostdlib" }
+// { dg-extra-ld-options "-r" }
 
 #pragma implementation
 struct S {};

gcc/testsuite/g++.dg/lto/pr62026.C

 // { dg-lto-do link }
-// { dg-lto-options {{-flto -O3 -r -nostdlib}} }
+// { dg-lto-options {{-flto -O3 -r}} }
 class C;
 class F {
   virtual C m_fn1();

gcc/testsuite/gcc.dg/lto/pr45736_0.c

 /* { dg-lto-do link } */
-/* { dg-lto-options {{-flto -r -nostdlib -O}} } */
+/* { dg-lto-options {{-flto -r -O}} } */
 /* { dg-extra-ld-options "-flinker-output=nolto-rel" } */
 
 extern void baz (void);

gcc/testsuite/gcc.dg/lto/pr52634_0.c

 /* { dg-require-weak "" } */
 /* { dg-require-alias "" } */
 /* { dg-lto-do link } */
-/* { dg-lto-options {{-flto -r -nostdlib -flto-partition=1to1}} */
+/* { dg-lto-options {{-flto -r -flto-partition=1to1}} */
 /* { dg-extra-ld-options "-flinker-output=nolto-rel" } */
 extern int cfliteValueCallBacks;
 void baz (int *);

gcc/testsuite/gfortran.dg/lto/20091016-1_0.f90

 ! { dg-lto-do link }
-! { dg-lto-options {{-flto -g -fPIC -r -nostdlib} {-O -flto -g -fPIC -r -nostdlib}} }
+! { dg-lto-options {{-flto -g -fPIC -r} {-O -flto -g -fPIC -r}} }
 ! { dg-extra-ld-options "-flinker-output=nolto-rel" }
 
       FUNCTION makenumberstring(x)

gcc/testsuite/gfortran.dg/lto/pr79108_0.f90

 ! { dg-lto-do link }
 ! { dg-lto-options {{ -Ofast -flto --param ggc-min-expand=0 --param ggc-min-heapsize=0 }} }
-! { dg-extra-ld-options "-r -nostdlib" }
+! { dg-extra-ld-options "-r" }
 
 MODULE Errorcheck_mod
 CONTAINS