[PATCH] hurd: align -p and -pg behavior on Linux

[Samuel Thibault]

On Linux, -p and -pg do not make gcc link against libc_p.a, only
-profile does (as documented in r11246), and thus people expect -p
and -pg to work without libc_p.a installed (it is actually even not
available any more in Debian).  We should thus rather make the Hurd port
do the same to avoid build failures.

Samuel

        * gcc/config/gnu.h (LIB_SPEC) [-p|-pg]: Link with -lc instead of -lc_p.
        * gcc/config/i386/gnu.h (STARTFILE_SPEC) [-p|-pg]: Use gcrt1.o
        instead of gcrt0.o.

--- gcc/config/gnu.h.orig       2015-09-16 00:43:09.785570853 +0200
+++ gcc/config/gnu.h    2015-09-16 00:43:12.513550418 +0200
@@ -25,7 +25,7 @@
 
 /* Default C library spec.  */
 #undef LIB_SPEC
-#define LIB_SPEC "%{pthread:-lpthread} %{pg|p|profile:-lc_p;:-lc}"
+#define LIB_SPEC "%{pthread:-lpthread} %{profile:-lc_p;:-lc}"
 
 #undef GNU_USER_TARGET_OS_CPP_BUILTINS
 #define GNU_USER_TARGET_OS_CPP_BUILTINS()              \
--- gcc/config/i386/gnu.h.orig  2015-09-17 21:41:13.000000000 +0000
+++ gcc/config/i386/gnu.h       2015-09-17 23:03:57.000000000 +0000
@@ -27,11 +27,11 @@
 #undef STARTFILE_SPEC
 #if defined HAVE_LD_PIE
 #define STARTFILE_SPEC \
-  "%{!shared: 
%{pg|p|profile:gcrt0.o%s;pie:Scrt1.o%s;static:crt0.o%s;:crt1.o%s}} \
+  "%{!shared: 
%{pg|p:gcrt1.o%s;profile:gcrt0.o%s;pie:Scrt1.o%s;static:crt0.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|profile:gcrt0.o%s;static:crt0.o%s;:crt1.o%s}} \
+  "%{!shared: %{pg|p:gcrt1.o%s;profile:gcrt0.o%s;static:crt0.o%s;:crt1.o%s}} \
    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
 #endif