[Bug ada/30560] New: gnatchop behaves differently dependend on argv[0] -- make check-ada fails

["rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

I have

lrwxrwxrwx 1 root root     12 Jan 22 14:54 /usr/bin/gnatchop -> gnatchop-4.1
-rwxr-xr-x 1 root root 285224 Nov 25 12:24 /usr/bin/gnatchop-4.1

calling

> gnatchop x.adb

works as expected, calling

> gnatchop-4.1 x.adb

does not (PR29127), and

> /usr/bin/gnatchop x.adb

doesn't work either!  (which breaks the acats host_gnatchop script)

It looks like gnatchop follows symlinks on each path component if
argv[0] is not gnatchop.  From strace of the last case:

execve("/usr/bin/gnatchop", ["/usr/bin/gnatchop", "support/checkfil.ada"], [/*
80 vars */]) = 0
...
getcwd("/abuild/rguenther/obj/gcc/testsuite/ada/acats", 4096) = 46
readlink("/usr", 0x7fff76f33480, 4098)  = -1 EINVAL (Invalid argument)
readlink("/usr/bin", 0x7fff76f33480, 4098) = -1 EINVAL (Invalid argument)
stat("support/checkfil.ada", {st_mode=S_IFREG|0644, st_size=7893, ...}) = 0
stat("support/checkfil.ada", {st_mode=S_IFREG|0644, st_size=7893, ...}) = 0
getcwd("/abuild/rguenther/obj/gcc/testsuite/ada/acats", 4096) = 46
readlink("/usr", 0x7fff76f332c0, 4098)  = -1 EINVAL (Invalid argument)
readlink("/usr/bin", 0x7fff76f332c0, 4098) = -1 EINVAL (Invalid argument)
readlink("/usr/bin/gnatchop", "gnatchop-4.1", 4098) = 12
readlink("/usr/bin/gnatchop-4.1", 0x7fff76f332c0, 4098) = -1 EINVAL (Invalid
argument)
stat("/usr/bin/gnatchop-gcc", 0x7fff76f362c0) = -1 ENOENT (No such file or
directory)
stat("/usr/local/bin/gnatchop-gcc", 0x7fff76f362c0) = -1 ENOENT (No such file
or directory)
stat("/usr/bin/gnatchop-gcc", 0x7fff76f362c0) = -1 ENOENT (No such file or
direc
...

This causes make check-ada to fail like

                === acats support ===
Generating support files...gnatmake --GCC="/abuild/rguenther/obj/gcc/xgcc
-B/abuild/rguenther/obj/gcc/" -gnatws -O2
/space/rguenther/src/svn/trunk/gcc/testsuite/ada/acats/support/impbit.adb
-largs --GCC="/abuild/rguenther/obj/gcc/xgcc -B/abuild/rguenther/obj/gcc/"
/abuild/rguenther/obj/gcc/xgcc -c
-I/space/rguenther/src/svn/trunk/gcc/testsuite/ada/acats/support/
-B/abuild/rguenther/obj/gcc/ -gnatws -O2 -I-
/space/rguenther/src/svn/trunk/gcc/testsuite/ada/acats/support/impbit.adb
gnatbind -x impbit.ali
gnatlink impbit.ali --GCC=/abuild/rguenther/obj/gcc/xgcc
-B/abuild/rguenther/obj/gcc/
target_bit= 64
target_insn=nop
gnatchop-gcc: installation problem, executable not found
no source files written
gnatchop-gcc: installation problem, executable not found
no source files written
...


-- 
           Summary: gnatchop behaves differently dependend on argv[0] --
                    make check-ada fails
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
OtherBugsDependingO 29127
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30560