For each flag in LIST-OF-FLAGS, it expands to lower-cased shell variable with the prefix holding the flag original value. The saved variables can be restored by AX_RESTORE_FLAGS_WITH_PREFIX
As an example: AX_SAVE_FLAGS_WITH_PREFIX([GL], [[CFLAGS],[LIBS]]) expands to
gl_saved_flag_cflags="$CFLAGS" gl_saved_flag_libs="$LIBS" CFLAGS="$GL_CFLAGS $CFLAGS" LIBS="$GL_LIBS $LIBS"
One common use case is to define a package specific wrapper macro around this one, and also setup other variables if needed. For example:
AC_DEFUN([_AX_CHECK_GL_SAVE_FLAGS], [ AX_SAVE_FLAGS_WITH_PREFIX([GL],[$1]) AC_LANG_PUSH([C]) ])
# pushes GL_CFLAGS and GL_LIBS to CFLAGS and LIBS # also set the current language to test to C _AX_CHECK_GL_SAVE_FLAGS([[CFLAGS],[LIBS]])
Download the latest version of ax_save_flags_with_prefix.m4 or browse the macro’s revision history.
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