15.6.5 AC_FOO_IFELSE vs. AC_TRY_FOO

Since Autoconf 2.50, internal codes uses AC_PREPROC_IFELSE, AC_COMPILE_IFELSE, AC_LINK_IFELSE, and AC_RUN_IFELSE on the other one hand and AC_LANG_SOURCES, and AC_LANG_PROGRAM on the other hand instead of the deprecated AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK, and AC_TRY_RUN. The motivations where:

• a more consistent interface: AC_TRY_COMPILE etc. were double quoting their arguments;

• the combinatoric explosion is solved by decomposing on the one hand the generation of sources, and on the other hand executing the program;

• this scheme helps supporting more languages than plain C and C++.

In addition to the change of syntax, the philosphy has changed too: while emphasis was put on speed at the expense of accuracy, today's Autoconf promotes accuracy of the testing framework at, ahem..., the expense of speed.

As a perfect example of what is not to be done, here is how to find out whether a header file contains a particular declaration, such as a typedef, a structure, a structure member, or a function. Use AC_EGREP_HEADER instead of running grep directly on the header file; on some systems the symbol might be defined in another header file that the file you are checking `#include's.

As a (bad) example, here is how you should not check for C preprocessor symbols, either defined by header files or predefined by the C preprocessor: using AC_EGREP_CPP:

AC_EGREP_CPP(yes, [#ifdef _AIX yes #endif ], is_aix=yes, is_aix=no)

The above example, properly written would (i) use AC_LANG_PROGRAM, and (ii) run the compiler:

AC_COMPILE_IFELSE([AC_LANG_PROGRAM( [[#if !defined _AIX # error _AIX not defined #endif ]])], [is_aix=yes], [is_aix=no])