[petsc-dev] Need a CFLAGS that does is *not* included in the link

[Jed Brown]

On Thu, May 24, 2012 at 9:31 PM, Chetan Jhurani <chetan.jhurani at gmail.com>wrote:

> I faced a similar problem when using -x argument with nvcc during****
>
> petsc configuration, which could be fixed if CFLAGS was not passed****
>
> to the linker. So sending this info in case it is useful.
>

So in general, CFLAGS must be passed to the linker (it contains
optimization and debugging stuff that should be consistent). The -x option
is very special in that it cannot be passed to the linker.


> ****
>
> ** **
>
> [jhurani at enrico ~]$ cat a.c****
>
> int main()****
>
> {****
>
> }****
>
> ** **
>
> [jhurani at enrico ~]$ nvcc a.c -x c++ -c****
>
> [jhurani at enrico ~]$ nvcc a.o -x c++****
>
> a.o:1: error: stray '\177' in program****
>
> a.o:1: error: stray '\2' in program****
>
> a.o:1: error: stray '\1' in program****
>
> a.o:1: error: stray '\1' in program****
>
> a.o:1:8: warning: null character(s) ignored****
>
> a.o:1: error: stray '\1' in program****
>
> a.o:1:18: warning: null character(s) ignored****
>
> ** **
>
> and many more lines…****
>
> ** **
>
> Chetan****
>
> ** **
>
> ** **
>
> *From:* petsc-dev-bounces at mcs.anl.gov [mailto:
> petsc-dev-bounces at mcs.anl.gov] *On Behalf Of *Jed Brown
> *Sent:* Thursday, May 24, 2012 7:09 PM
> *To:* For users of the development version of PETSc
> *Subject:* [petsc-dev] Need a CFLAGS that does is *not* included in the
> link****
>
> ** **
>
> Building PETSc with clang++ produces a warning about compiling *.c as C++
> being deprecated. To silence the warning, we would need to pass "-x c++" to
> the compiler, but NOT to the linker. CFLAGS is currently also passed to the
> linker. Is this something we want to fix?****
>
> ** **
>
> ** **
>
> Clang used to SEGV when "-x c++" is passed to the linker. Now (latest SVN)
> it just interprets the object file as C++ source (which obviously produces
> a ton of garbage).****
>
> ** **
>
> http://llvm.org/bugs/show_bug.cgi?id=12924****
>
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