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[3119] Added a comment regarding autoconf macros used.

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As per review added a comment about the use of $ac_header_preproc.
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Kean Johnston
2013-11-07 08:38:42 +02:00
parent 43c7225635
commit 61f52a04ef
1 changed files with 6 additions and 0 deletions
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6
configure.ac
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@@ -754,6 +754,12 @@ CPPFLAGS_SAVED=$CPPFLAGS
CPPFLAGS="$BOTAN_INCLUDES $CPPFLAGS"
LIBS_SAVED="$LIBS"
LIBS="$LIBS $BOTAN_LIBS"
dnl ac_header_preproc is an autoconf symbol (undocumented but stable) that
dnl is set if the pre-processor phase passes. Thus by adding a custom
dnl failure handler we can detect the difference between a header no existing
dnl (or not even passing the pre-processor phase) and a header file resulting
dnl in compilation failures.
AC_CHECK_HEADERS([botan/botan.h],,[
if test "x$ac_header_preproc" = "xyes"; then
AC_MSG_ERROR([