Bug 234076

Can't reproduce:
gcc --version; gcc -print-file-name=include; gcc -m32 -print-file-name=include;
gcc -print-file-name=include -m32
gcc (GCC) 4.1.2 20070317 (Red Hat 4.1.2-5)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

/usr/lib/gcc/x86_64-redhat-linux/4.1.2/include
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/include
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/include

(nor can I reproduce this with FC6 or RHEL5 gcc).

I'm puzzled... attaching strace output for:

  gcc -print-file-name=include
  gcc -m32 -print-file-name=include

Created attachment 151071 [details]
output of gcc -m32 -print-file-name=include

Created attachment 151073 [details]
output of strace gcc -print-file-name=include

Diffing the two traces, I see gcc is looking for
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/32/include, which doesn't exist.  Then it
tries all kinds of fancy paths and eventually finds that silly result.

You have /lib/../lib/include file or directory, that isn't supposed to exist
and in that case it would soon find what you expect.  The GCC file search
algorithm is quite complicated, but /lib is one of the tool dirs and
../lib is the -m32 on x86_64 multi-os-directory.
Not sure if you have /lib as a symlink or have /include file/directory, in
any case this isn't a gcc bug.

Oh, gosh!

The problem is that I really *had* /lib/include in my system since 1999.
That's why you couldn't reproduce it.

But I'd still consider it a bug: gcc built from svn trunk doesn't fall
in the trap.  Maybe it's RedHat specific, maybe not.

Maybe it has something to do with --prefix=/usr ? I read somewhare that
/usr is special in some packages such as glibc because it also implies /
as a search path.

Yes, --prefix=/usr is special, this is nothing Red Hat specific.

I think we can leave this alone, then.

For the record, the 4.3 search path appears very different:

bender:/# gcc -m32 -print-search-dirs 
install: /usr/lib/gcc/x86_64-redhat-linux/4.1.2/
programs:
=/usr/libexec/gcc/x86_64-redhat-linux/4.1.2/:/usr/libexec/gcc/x86_64-redhat-linux/4.1.2/:/usr/libexec/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/:/usr/lib/gcc/x86_64-redhat-linux/:/usr/libexec/gcc/x86_64-redhat-linux/4.1.2/:/usr/libexec/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/:/usr/lib/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../x86_64-redhat-linux/bin/x86_64-redhat-linux/4.1.2/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../x86_64-redhat-linux/bin/
libraries:
=/usr/lib/gcc/x86_64-redhat-linux/4.1.2/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../x86_64-redhat-linux/lib/x86_64-redhat-linux/4.1.2/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../x86_64-redhat-linux/lib/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../x86_64-redhat-linux/4.1.2/:/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../:/lib/x86_64-redhat-linux/4.1.2/:/lib/:/usr/lib/x86_64-redhat-linux/4.1.2/:/usr/lib/

bender:# /usr/local/src/gcc/x86_64-linux-HEAD-install/bin/gcc -m32
-print-search-dirs
install:
/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/
programs:
=/usr/local/src/gcc/x86_64-linux-HEAD-install/libexec/gcc/x86_64-unknown-linux-gnu/4.3.0/:/usr/local/src/gcc/x86_64-linux-HEAD-install/libexec/gcc/x86_64-unknown-linux-gnu/4.3.0/:/usr/local/src/gcc/x86_64-linux-HEAD-install/libexec/gcc/x86_64-unknown-linux-gnu/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/:/usr/libexec/gcc/x86_64-unknown-linux-gnu/4.3.0/:/usr/libexec/gcc/x86_64-unknown-linux-gnu/:/usr/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/:/usr/lib/gcc/x86_64-unknown-linux-gnu/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu/4.3.0/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../x86_64-unknown-linux-gnu/bin/
libraries:
=/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/:/usr/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../x86_64-unknown-linux-gnu/lib/x86_64-unknown-linux-gnu/4.3.0/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../x86_64-unknown-linux-gnu/lib/../lib/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../x86_64-unknown-linux-gnu/4.3.0/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../lib/:/lib/x86_64-unknown-linux-gnu/4.3.0/:/lib/../lib/:/usr/lib/x86_64-unknown-linux-gnu/4.3.0/:/usr/lib/../lib/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../x86_64-unknown-linux-gnu/lib/:/usr/local/src/gcc/x86_64-linux-HEAD-install/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../:/lib/:/usr/lib/