[Bug c/62197] New: Option -Bprefix does not affect the search for the assembler

["r.berber at computer dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62197

            Bug ID: 62197
           Summary: Option -Bprefix does not affect the search for the
                    assembler
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: r.berber at computer dot org

A simple example showing the problem:

$ uname -a
Linux DiskStation 3.2.40 #4493 SMP Wed Jul 9 21:14:19 CST 2014 x86_64 GNU/Linux

$ gcc -dumpversion
4.9.1

$ echo 'main(){}' > dummy.c

$ strace gcc -B/opt/src/binutils-build/ld/tmpdir/gas/ dummy.c 2>&1 | grep "/as"
access("/opt/bin/as", X_OK)             = 0

$ /opt/src/binutils-build/ld/tmpdir/gas/as -V
GNU assembler version 2.24 (x86_64-unknown-linux-gnu) using BFD version (GNU
Binutils) 2.24

Every other program and file is searched for as the manual says, except the
assembler.

Using the alternative, GCC_EXEC_PREFIX, results in failure to find cc1.