[PATCH v2] Don't use Bash-specific ${parameter/pattern/string} expansion

["Patrick 'P. J.' McDermott" <pj at pehjota dot net>]

sysdeps/unix/make-syscalls.sh and sysdeps/unix/Makefile use GNU Bash's
${parameter/pattern/string} parameter expansion.  Non-Bash shells (e.g.
dash or BusyBox ash when built with CONFIG_ASH_BASH_COMPAT disabled)
don't support this expansion syntax.  So glibc will fail to build when
$(SHELL) expands to a path that isn't provided by Bash.

An example build failure:

    for dir in [...]; do \
      test -f $dir/syscalls.list && \
      { sysdirs='[...]' \
        asm_CPP='gcc -c    -I[...]   -D_LIBC_REENTRANT -include include/libc-symbols.h       -DASSEMBLER  -g -Wa,--noexecstack   -E -x assembler-with-cpp' \
        /bin/sh sysdeps/unix/make-syscalls.sh $dir || exit 1; }; \
      test $dir = sysdeps/unix && break; \
    done > [build-dir]/sysd-syscallsT
    sysdeps/unix/make-syscalls.sh: line 273: syntax error: bad substitution

This patch simply replaces the three instances of the Bash-only syntax
in these files with an echo and sed command substitution.

2013-09-11  P. J. McDermott  <pj@pehjota.net>

	* sysdeps/unix/Makefile: Don't use Bash-specific
	${parameter/pattern/string} parameter expansion.
	* sysdeps/unix/make-syscalls.sh: Likewise.

Changes in v2:
  * Use quotes around "$ver" and "$vdso_symver" expansions.
---
 sysdeps/unix/Makefile         |    6 ++++--
 sysdeps/unix/make-syscalls.sh |    2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/sysdeps/unix/Makefile b/sysdeps/unix/Makefile
index 375561f..2b607a0 100644
--- a/sysdeps/unix/Makefile
+++ b/sysdeps/unix/Makefile
@@ -51,12 +51,14 @@ $(objpfx)stub-syscalls.c: $(common-objpfx)sysd-syscalls \
 	 for call in $(unix-stub-syscalls); do \
 	   case $$call in \
 	   *@@*) \
-	     ver=$${call##*@}; call=$${call%%@*}; ver=$${ver//./_}; \
+	     ver=$${call##*@}; call=$${call%%@*}; \
+	     ver=`echo "$ver" | sed 's/\./_/g'`; \
 	     echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
 	     echo "versioned_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"\
 	     ;; \
 	   *@*) \
-	     ver=$${call##*@}; call=$${call%%@*}; ver=$${ver//./_}; \
+	     ver=$${call##*@}; call=$${call%%@*}; \
+	     ver=`echo "$ver" | sed 's/\./_/g'`; \
 	     echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
 	     echo "compat_symbol (libc, __$${call}_$${ver}, $$call, $$ver);" \
 	     ;; \
diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh
index f04f2ab..6eba62c 100644
--- a/sysdeps/unix/make-syscalls.sh
+++ b/sysdeps/unix/make-syscalls.sh
@@ -275,7 +275,7 @@ while read file srcfile caller syscall args strong weak; do
     # name in the vDSO and KERNEL_X.Y is its symbol version.
     vdso_symbol="${vdso_syscall%@*}"
     vdso_symver="${vdso_syscall#*@}"
-    vdso_symver="${vdso_symver//./_}"
+    vdso_symver=`echo "$vdso_symver" | sed 's/\./_/g'`
     echo "\
 \$(foreach p,\$(sysd-rules-targets),\$(objpfx)\$(patsubst %,\$p,$file).os): \\
 		\$(..)sysdeps/unix/make-syscalls.sh\
-- 
Patrick "P. J." McDermott
  http://www.pehjota.net/
Lead Developer, ProteanOS
  http://www.proteanos.com/