Re: [committed, PATCH] BZ #18409: Remove a trailing `\' in make-syscalls.sh

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

On 13-05-2015 16:34, H.J. Lu wrote:
> On Wed, May 13, 2015 at 12:30 PM, Adhemerval Zanella
> <adhemerval.zanella@linaro.org> wrote:
>> Hi
>>
>> On 13-05-2015 13:20, H.J. Lu wrote:
>>> commit c14874927b499ddfdbb03745bb32bfc778b8595f
>>> Author: Roland McGrath <roland@hack.frob.com>
>>> Date:   Tue May 22 16:00:50 2012 -0700
>>>
>>>     syscalls.list support for vDSO IFUNCs, use it for x32 gettimeofday and time.
>>>
>>> added
>>>
>>> \$(foreach p,\$(sysd-rules-targets),\$(objpfx)\$(patsubst %,\$p,$file).os): \\
>>>                 \$(..)sysdeps/unix/make-syscalls.sh\
>>>         \$(make-target-directory)
>>>
>>> to sysdeps/unix/make-syscalls.sh which generates
>>>
>>> #### CALL=gettimeofday NUMBER=(0x40000000 + 96) ARGS=i:pP SOURCE=-
>>> ifeq (,$(filter gettimeofday,$(unix-syscalls)))
>>> unix-syscalls += gettimeofday
>>> $(foreach p,$(sysd-rules-targets),$(foreach
>>> o,$(object-suffixes-noshared),$(objpfx)$(patsubst
>>> %,$p,gettimeofday)$o)): \
>>>                 $(..)sysdeps/unix/make-syscalls.sh
>>>         $(make-target-directory)
>>>         (echo '#define SYSCALL_NAME gettimeofday'; \
>>>          echo '#define SYSCALL_NARGS 2'; \
>>>          echo '#define SYSCALL_SYMBOL __gettimeofday'; \
>>>          echo '#include <syscall-template.S>'; \
>>>          echo 'weak_alias (__gettimeofday, gettimeofday)'; \
>>>          echo 'libc_hidden_weak (gettimeofday)'; \
>>>         ) | $(compile-syscall) $(foreach p,$(patsubst
>>> %gettimeofday,%,$(basename $(@F))),$($(p)CPPFLAGS))
>>> $(foreach p,$(sysd-rules-targets),$(objpfx)$(patsubst %,$p,gettimeofday).os): \
>>>                 $(..)sysdeps/unix/make-syscalls.sh      $(make-target-directory)
>>>                                                   ^^^^^^^^^ Missing newline
>>>         (echo '#include <dl-vdso.h>'; \
>>>          echo 'extern void *__gettimeofday_ifunc (void) __asm
>>> ("__gettimeofday");'; \
>>>          echo 'void *'; \
>>>          echo '__gettimeofday_ifunc (void)'; \
>>>          echo '{'; \
>>>          echo '  PREPARE_VERSION_KNOWN (symver, LINUX_2_6);'; \
>>>          echo '  return _dl_vdso_vsym ("__vdso_gettimeofday", &symver);'; \
>>>          echo '}'; \
>>>          echo 'asm (".type __gettimeofday, %gnu_indirect_function");'; \
>>>          echo 'asm (".globl __GI___gettimeofday\n"'; \
>>>          echo '     "__GI___gettimeofday = __gettimeofday");'; \
>>>          echo 'weak_alias (__gettimeofday, gettimeofday)'; \
>>>          echo 'libc_hidden_weak (gettimeofday)'; \
>>>         ) | $(compile-stdin.c) $(foreach p,$(patsubst
>>> %gettimeofday,%,$(basename $(@F))),$($(p)CPPFLAGS))
>>> endif
>>>
>>> This only affected x32.  I checked in this patch after tested on
>>> x32.
>>>
>>> Adhemerval, can you check if your problem with dash in
>>>
>>> https://sourceware.org/ml/libc-alpha/2015-04/msg00277.html
>>>
>>> is fixed by this?
>>>
>>> Thanks.
>>
>> I have been testing another more complete fix pointed out by Joseph [1]
>> and it fixes the x32 build with dash issue I was seeing.  Shouldn't we
>> push this one?
>>
>> [1] https://sourceware.org/ml/libc-alpha/2015-02/msg00396.html
> 
> Well, this part is the same as the one I checked in:
> 
>  \$(foreach p,\$(sysd-rules-targets),\$(objpfx)\$(patsubst %,\$p,$file).os): \\
> - \$(..)sysdeps/unix/make-syscalls.sh\
> + \$(..)sysdeps/unix/make-syscalls.sh
> 
> At minimum, that patch should be rebased.
> 

What about:

diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh
index 910a22c..12f664e 100644
--- a/sysdeps/unix/make-syscalls.sh
+++ b/sysdeps/unix/make-syscalls.sh
@@ -272,28 +272,33 @@ while read file srcfile caller syscall args strong weak; do
     vdso_symbol="${vdso_syscall%@*}"
     vdso_symver="${vdso_syscall#*@}"
     vdso_symver=`echo "$vdso_symver" | sed 's/\./_/g'`
-    echo "\
+    cat <<EOF
+
 \$(foreach p,\$(sysd-rules-targets),\$(objpfx)\$(patsubst %,\$p,$file).os): \\
 		\$(..)sysdeps/unix/make-syscalls.sh
 	\$(make-target-directory)
 	(echo '#include <dl-vdso.h>'; \\
-	 echo 'extern void *${strong}_ifunc (void) __asm (\"${strong}\");'; \\
+	 echo 'extern void *${strong}_ifunc (void) __asm ("${strong}");'; \\
 	 echo 'void *'; \\
 	 echo '${strong}_ifunc (void)'; \\
 	 echo '{'; \\
 	 echo '  PREPARE_VERSION_KNOWN (symver, ${vdso_symver});'; \\
-	 echo '  return _dl_vdso_vsym (\"${vdso_symbol}\", &symver);'; \\
+	 echo '  return _dl_vdso_vsym ("${vdso_symbol}", &symver);'; \\
 	 echo '}'; \\
-	 echo 'asm (\".type ${strong}, %gnu_indirect_function\");'; \\"
+	 echo 'asm (".type ${strong}, %gnu_indirect_function");'; \\
+EOF
     # This is doing "libc_hidden_def (${strong})", but the compiler
     # doesn't know that we've defined ${strong} in the same file, so
     # we can't do it the normal way.
-    echo "\
-	 echo 'asm (\".globl __GI_${strong}\\n\"'; \\
-	 echo '     \"__GI_${strong} = ${strong}\");'; \\"
+    cat <<EOF
+	 echo 'asm (".globl __GI_${strong}");'; \\
+	 echo 'asm ("__GI_${strong} = ${strong}");'; \\
+EOF
     emit_weak_aliases
-    echo '	) | $(compile-stdin.c) '"\
-\$(foreach p,\$(patsubst %$file,%,\$(basename \$(@F))),\$(\$(p)CPPFLAGS))"
+    cat <<EOF
+	) | \$(compile-stdin.c) \
+\$(foreach p,\$(patsubst %$file,%,\$(basename \$(@F))),\$(\$(p)CPPFLAGS))
+EOF
   fi
 
   if test $shared_only = t; then

I checked builds for x86_64, i386, x32, and aarch64 for both dash and bash.