I did try this intially as well, converting the config.h to a derived xconfig.h with all defines being #ifndef/def. It did turn out to be problematic with some packages having parts of their public header defines enabled/disabled depending on configure-time values packed onto xconfig.h - including however a second xconfig.h made some of those parts suddenly appear/disappear or simply change in the middle, possibly even leading to linker errors. Effectivly, do not mix configure-time values of different packages as they may have been configured on different systems (especially true for rpm *-devel systems). Just make sure that all the packages use different symbols to transport their configure-time autodetected values. That can be done traditionally, with an extra myconfig.h.in (to be written manually) or by using ax_prefix_config_h to ship around a prefix'er autogenenerated header.
have fun, guido
Thomas 'Tom' R. Treadway III wrote:
I agree, I've run into this problem. Depending on the compiler and options this may end up being a fatal compile error.
It would be better to use: #ifndef PACKAGE_VERSION #define PACKAGE_VERSION #endif ! PACKAGE_VERSION
trt
Dear all, This is not really a bug but I wonder if you have any remedy to the following problem. If you use autoconf/automake for several packages which interact with each other and for each package you generate a configuration file config.h you migh end up with redefinition warning message if config.h's are read "together".
... warning: "PACKAGE_VERSION" redefined ... warning: this is the location of the previous definition
... warning: "VERSION" redefined ... warning: this is the location of the previous definition
My concern is how to avoid this? Shouldn't these macro defintion be unique
for each package? Should there be a protection mechanism?
Sincerely, Patrick
-- Thomas R. Treadway Computer Scientist Lawrence Livermore Nat'l Lab 7000 East Avenue, L-365 Livermore, CA 94550-0611
-- -- guido http://google.de/search?q=guidod GCS/E/S/P C++/++++$ ULHS L++w- N++@ s+:a d(+-) r+@>+++ y++ 5++X- (geekcode)
