Please test the following diff
I can make a more minimal change for pkgsrc copying netbsd and override STARTFILE_SPEC
but I think this is nicer.
? work
Index: distinfo
===================================================================
RCS file: /cvsroot/pkgsrc/lang/gcc7/distinfo,v
retrieving revision 1.6
diff -u -r1.6 distinfo
--- distinfo 5 Jul 2017 10:17:01 -0000 1.6
+++ distinfo 23 Jul 2017 18:42:12 -0000
@@ -10,7 +10,9 @@
Size (isl-0.16.1.tar.bz2) = 1626446 bytes
SHA1 (patch-contrib_download__prerequisites) = 86c6c16e0e3e3a0bcb38579a8b4004f603fac1ca
SHA1 (patch-gcc_Makefile.in) = c0f97c75ba1d37eae894141edd58bb36b734f651
-SHA1 (patch-gcc_config.gcc) = fea8288c22bb2c4dd44a5e77c8f92dee8f8f6b18
+SHA1 (patch-gcc_config.gcc) = f03da5fd74eac67402df6a2a71236df90737137f
+SHA1 (patch-gcc_config_alpha_elf.h) = 2897337860aae09a270b38b8e296e1494b3c8629
+SHA1 (patch-gcc_config_alpha_linux.h) = bb2247b0201363dedf8d13b329fb7e2dd14053ce
SHA1 (patch-gcc_config_arm_arm.h) = 92c8bff1063e153fec4454e6dea5334a42b0dad6
SHA1 (patch-gcc_config_netbsd-protos.h) = 6d28864b4ccc8c1a63fe28e43601b84b63a00633
SHA1 (patch-gcc_config_netbsd.c) = 85f786bce881ef2fc348f98ef81fdbc001076183
Index: patches/patch-gcc_config.gcc
===================================================================
RCS file: /cvsroot/pkgsrc/lang/gcc7/patches/patch-gcc_config.gcc,v
retrieving revision 1.1
diff -u -r1.1 patch-gcc_config.gcc
--- patches/patch-gcc_config.gcc 3 May 2017 00:21:03 -0000 1.1
+++ patches/patch-gcc_config.gcc 23 Jul 2017 18:42:13 -0000
@@ -1,8 +1,8 @@
$NetBSD: patch-gcc_config.gcc,v 1.1 2017/05/03 00:21:03 maya Exp $
---- gcc/config.gcc.orig 2016-12-10 21:07:10.000000000 +0000
+--- gcc/config.gcc.orig 2017-03-24 13:59:51.000000000 +0000
+++ gcc/config.gcc
-@@ -765,10 +765,15 @@ case ${target} in
+@@ -775,10 +775,15 @@ case ${target} in
target_has_targetcm=yes
;;
*-*-netbsd*)
@@ -19,14 +19,35 @@
# NetBSD 2.0 and later get POSIX threads enabled by default.
# Allow them to be explicitly enabled on any other version.
-@@ -1460,10 +1465,12 @@ x86_64-*-freebsd*)
+@@ -804,6 +809,7 @@ case ${target} in
+ default_use_cxa_atexit=yes
+ ;;
+ esac
++ nbsd_tm_file="${nbsd_tm_file} netbsd.h netbsd-stdint.h netbsd-elf.h"
+ ;;
+ *-*-openbsd*)
+ tmake_file="t-openbsd"
+@@ -999,7 +1005,7 @@ alpha*-*-freebsd*)
+ extra_options="${extra_options} alpha/elf.opt"
+ ;;
+ alpha*-*-netbsd*)
+- tm_file="elfos.h ${tm_file} netbsd.h alpha/elf.h netbsd-elf.h alpha/netbsd.h"
++ tm_file="elfos.h ${tm_file} ${nbsd_tm_file} alpha/elf.h alpha/netbsd.h"
+ tmake_file="${tmake_file} alpha/t-alpha"
+ extra_options="${extra_options} netbsd.opt netbsd-elf.opt \
+ alpha/elf.opt"
+@@ -1472,12 +1478,14 @@ x86_64-*-freebsd*)
+ tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h ${fbsd_tm_file} i386/x86-64.h i386/freebsd.h i386/freebsd64.h"
+ ;;
i[34567]86-*-netbsdelf*)
- tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h netbsd.h netbsd-stdint.h netbsd-elf.h i386/netbsd-elf.h"
+- tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h netbsd.h netbsd-stdint.h netbsd-elf.h i386/netbsd-elf.h"
++ tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h ${nbsd_tm_file} i386/netbsd-elf.h"
extra_options="${extra_options} netbsd.opt netbsd-elf.opt"
+ tmake_file="${tmake_file} i386/t-crtstuff"
;;
x86_64-*-netbsd*)
- tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h netbsd.h netbsd-stdint.h netbsd-elf.h i386/x86-64.h i386/netbsd64.h"
+- tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h netbsd.h netbsd-stdint.h netbsd-elf.h i386/x86-64.h i386/netbsd64.h"
++ tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h ${nbsd_tm_file} i386/x86-64.h i386/netbsd64.h"
extra_options="${extra_options} netbsd.opt netbsd-elf.opt"
+ tmake_file="${tmake_file} i386/t-crtstuff"
;;
Index: patches/patch-gcc_config_alpha_elf.h
===================================================================
RCS file: patches/patch-gcc_config_alpha_elf.h
diff -N patches/patch-gcc_config_alpha_elf.h
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ patches/patch-gcc_config_alpha_elf.h 23 Jul 2017 18:42:13 -0000
@@ -0,0 +1,39 @@
+$NetBSD$
+
+move linux-specific spec definitions to the linux file
+
+--- gcc/config/alpha/elf.h.orig 2017-01-01 12:07:43.000000000 +0000
++++ gcc/config/alpha/elf.h
+@@ -100,32 +100,6 @@ do { \
+ ASM_OUTPUT_DEF (FILE, alias, name); \
+ } while (0)
+
+-/* Provide a STARTFILE_SPEC appropriate for ELF. Here we add the
+- (even more) magical crtbegin.o file which provides part of the
+- support for getting C++ file-scope static object constructed
+- before entering `main'. */
+-
+-#undef STARTFILE_SPEC
+-#ifdef HAVE_LD_PIE
+-#define STARTFILE_SPEC \
+- "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
+- crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
+-#else
+-#define STARTFILE_SPEC \
+- "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
+- crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
+-#endif
+-
+-/* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the
+- magical crtend.o file which provides part of the support for
+- getting C++ file-scope static object constructed before entering
+- `main', followed by a normal ELF "finalizer" file, `crtn.o'. */
+-
+-#undef ENDFILE_SPEC
+-#define ENDFILE_SPEC \
+- "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
+- %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
+-
+ /* This variable should be set to 'true' if the target ABI requires
+ unwinding tables even when exceptions are not used. */
+ #define TARGET_UNWIND_TABLES_DEFAULT true
Index: patches/patch-gcc_config_alpha_linux.h
===================================================================
RCS file: patches/patch-gcc_config_alpha_linux.h
diff -N patches/patch-gcc_config_alpha_linux.h
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ patches/patch-gcc_config_alpha_linux.h 23 Jul 2017 18:42:13 -0000
@@ -0,0 +1,34 @@
+$NetBSD$
+
+move linux-specific spec definitions to the linux file
+
+--- gcc/config/alpha/linux.h.orig 2017-01-01 12:07:43.000000000 +0000
++++ gcc/config/alpha/linux.h
+@@ -78,6 +78,27 @@ along with GCC; see the file COPYING3.
+
+ #define TARGET_POSIX_IO
+
++#undef STARTFILE_SPEC
++#ifdef HAVE_LD_PIE
++#define STARTFILE_SPEC \
++ "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
++ crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
++#else
++#define STARTFILE_SPEC \
++ "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
++ crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
++#endif
++
++/* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the
++ magical crtend.o file which provides part of the support for
++ getting C++ file-scope static object constructed before entering
++ `main', followed by a normal ELF "finalizer" file, `crtn.o'. */
++
++#undef ENDFILE_SPEC
++#define ENDFILE_SPEC \
++ "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
++ %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
++
+ #define LINK_GCC_C_SEQUENCE_SPEC \
+ "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
+
