On 6/28/11 4:06 PM, Niclas Zeising wrote:
On 2011-06-28 21:19, Pan Tsu wrote:
Niclas Zeising<zeis...@daemonic.se> writes:
Sorry for hijacking this thread, and cross posting.
On 2011-06-26 03:07, Gabor PALI wrote:
With Clang, an error occurs in one of the configure scripts, because
Clang warns about unused command-line arguments, and the configure
script assumes that to be a compiler error. You can deal with this by
adding -Qunused-parameter to CFLAGS.
Thanks for investigating this.
This should probably be made the default, at least for ports when clang
is compiled, since the output generated when not using
-Qunused-parameter confuses configure scripts, and stops at least
FireFox 5 from compiling, that I know of.
Do you use ccache? Try without.
For example, the combo confuses libtool
It has nothing to do with cccache. The issue is that clang by default
warns when passed flags (-std= -f -W etc.) that's not used during the
compilation/linking. This can be silenced with -Qunused-arguments, and
if not, it confuses configure scripts that believe this is an error in
the code it uses to test for features.
Regards!
Example: In the GHC port, the configure script tries to figure out
whether the ISA supports PC-relative indexing. It does this by
generating a simple program, which contains some asm containing
PC-relative indexing, compiling it, and seeing if the compiler generates
a warning. If clang warns about unused arguments, then the configure
script assumes (falsely) that the ISA does not support PC-relative
indexing, and generates bad assembly code, which causes trouble downstream.
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