automake issue

[Corinna Vinschen]

On Oct 20 16:58, Ken Brown wrote:
> I was debugging with what I thought was an unoptimized build of cygwin1.dll
> (with -O0 in CXXFLAGS), but then I discovered that malloc.cc was actually
> compiled with -O3.  This is because of the following snippet from
> winsup/cygwin/Makefile.am:
> 
> # If an optimization level is explicitly set in CXXFLAGS, set -O3 for these files
> # XXX: this seems to assume it's not -O0?
> #
> # (the indentation here prevents automake trying to process this as an automake
> # conditional)
>  ifneq "${filter -O%,$(CXXFLAGS)}" ""
>   malloc_CFLAGS=-O3
>   sync_CFLAGS=-O3
>  endif
> 
> I thought I could fix this by changing the snippet to
> 
>  ifneq "${filter -O%,$(CXXFLAGS)}" ""
>   ifeq "${filter -O0,$(CXXFLAGS)}" ""
>    malloc_CFLAGS=-O3
>    sync_CFLAGS=-O3
>   endif
>  endif
> 
> but this didn't work.  After running winsup/autogen.sh,
> winsup/cygwin/Makefile.in contained
> 
> malloc_CFLAGS = -O3
> sync_CFLAGS = -O3
> 
> unconditionally.
> 
> So in spite of the comment above about indentation, it seems that the
> conditional is being treated as an automake conditional.
> 
> Does anyone know how to fix this so that -O0 really produces an unoptimized build?

I workaround this by setting CFLAGS=-g on the command line.  There's no
-O then and it should work as desired.  The save thing would probably
be something like this, though:

https://stackoverflow.com/questions/4256609/makefile-conditional-with-automake-autoconf


Corinna