[cfe-dev] Patch: Find gcc-4.4.4 on Gentoo

[Dongsheng Song]

On Tue, Nov 16, 2010 at 07:10, Bertjan Broeksema <broeksema at kde.org> wrote:
> Hi all,
>
> Attached a trivial patch against trunk to make InitHeaderSearch find
> gcc-4.4.4 headers on Gentoo systems. Tested here and now I finally have a
> working clang!
>
> Cheers,
>
> Bertjan
>

I think hard code the include/lib path is BAD idea.
Even a mirror version bummed, we must add another case !

I think we maybe have 2 approach:

1. Use a config file
This file can be generated by compile time, and updated at any time.

2. Found path at run time
For example, gcc can generate such verbose output:

# gcc -O2 -v Hello.c
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian
4.4.5-6' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.4 --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib
--enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-objc-gc --enable-targets=all --with-arch-32=i586
--with-tune=generic --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.4.5 (Debian 4.4.5-6)
COLLECT_GCC_OPTIONS='-O2' '-v' '-mtune=generic' '-march=i586'
 /usr/lib/gcc/i486-linux-gnu/4.4.5/cc1 -quiet -v Hello.c -quiet
-dumpbase Hello.c -mtune=generic -march=i586 -auxbase Hello -O2
-version -o /tmp/ccd2fqzF.s
ignoring nonexistent directory "/usr/local/include/i486-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../../i486-linux-gnu/include"
ignoring nonexistent directory "/usr/include/i486-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc/i486-linux-gnu/4.4.5/include
 /usr/lib/gcc/i486-linux-gnu/4.4.5/include-fixed
 /usr/include
End of search list.
GNU C (Debian 4.4.5-6) version 4.4.5 (i486-linux-gnu)
        compiled by GNU C version 4.4.5, GMP version 4.3.2, MPFR
version 3.0.0-p3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: ac416eae4ede756d7afac2a14e735189
COLLECT_GCC_OPTIONS='-O2' '-v' '-mtune=generic' '-march=i586'
 as -V -Qy -o /tmp/ccjkT41T.o /tmp/ccd2fqzF.s
GNU assembler version 2.20.1 (i486-linux-gnu) using BFD version (GNU
Binutils for Debian) 2.20.1-system.20100303
COMPILER_PATH=/usr/lib/gcc/i486-linux-gnu/4.4.5/:/usr/lib/gcc/i486-linux-gnu/4.4.5/:/usr/lib/gcc/i486-linux-gnu/:/usr/lib/gcc/i486-linux-gnu/4.4.5/:/usr/lib/gcc/i486-linux-gnu/:/usr/lib/gcc/i486-linux-gnu/4.4.5/:/usr/lib/gcc/i486-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/i486-linux-gnu/4.4.5/:/usr/lib/gcc/i486-linux-gnu/4.4.5/:/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-O2' '-v' '-mtune=generic' '-march=i586'
 /usr/lib/gcc/i486-linux-gnu/4.4.5/collect2 --build-id --eh-frame-hdr
-m elf_i386 --hash-style=both -dynamic-linker /lib/ld-linux.so.2
/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../../lib/crt1.o
/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../../lib/crti.o
/usr/lib/gcc/i486-linux-gnu/4.4.5/crtbegin.o
-L/usr/lib/gcc/i486-linux-gnu/4.4.5
-L/usr/lib/gcc/i486-linux-gnu/4.4.5
-L/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../../lib -L/lib/../lib
-L/usr/lib/../lib -L/usr/lib/gcc/i486-linux-gnu/4.4.5/../../..
/tmp/ccjkT41T.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc
--as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/i486-linux-gnu/4.4.5/crtend.o
/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../../lib/crtn.o
root at vc:/tmp#

We can got lib path (LIBRARY_PATH) and include path ( #include search
starts here / End of search list) very easy.

--
Dongsheng