include/CMakeLists.txt: error out when architecture is not supported

Since commit b98c56fd5e86fa76eb55a98a2266a923f64f705c ("stop exposing
hidden defines in public opensslconf.h"), only a subset of CPU
architectures is supported by libressl. However, when a build is
attempted for an unsupported architecture, it doesn't fail with a
clear error message at configure time, but it fails with a weird error
at build time:

crypto/../include/openssl/rc4.h:75:9: error: unknown type name 'RC4_INT'

In order to help users, let's bail out nicely at configure time with a
good error message when the CPU architecture is not supported.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
index 9d015cd..59f5b62 100644
--- a/include/CMakeLists.txt
+++ b/include/CMakeLists.txt
@@ -38,5 +38,7 @@ elseif(HOST_SPARC64)
         file(READ arch/sparc64/opensslconf.h OPENSSLCONF)
 elseif(HOST_X86_64)
         file(READ arch/amd64/opensslconf.h OPENSSLCONF)
+else()
+        message(FATAL_ERROR "Architecture not supported")
 endif()
 file(WRITE ${CMAKE_BINARY_DIR}/include/openssl/opensslconf.h "${OPENSSLCONF}")