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Diffstat (limited to 'README')
| -rw-r--r-- | README | 16 |
1 files changed, 7 insertions, 9 deletions
@@ -63,15 +63,13 @@ Other things: systems that have the function. * Autoconf functions can use gl_* prefix. The AC_* prefix is for autoconf internal functions. -* Try to prevent that the files are built if they aren't needed on a - platform. Valid excuses to this rule include ELIDE constructs that - lead to an empty .o file (see getopt module). -* If you have a .c file that leads to an empty .o file on some platforms - (through some big #if around all the code), still make sure that after - preprocessing the compilation unit is not empty. This is usually fulfilled - if you #include <stdio.h> or #include <sys/types.h> before the big #if; - otherwise you need to add a #else branch containing "typedef int dummy;" - or "extern int dummy;". +* Build files only if they are needed on a platform. Look at the + alloca and fnmatch modules for how to achieve this. If for some + reason you cannot do this, and you have a .c file that leads to an + empty .o file on some platforms (through some big #if around all the + code), then ensure that the compilation unit is not empty after + preprocessing. One way to do this is to #include <stddef.h> or + <stdio.h> before the big #if. Portability guidelines ---------------------- |