Add option LIBRESSL_SKIP_INSTALL

Internally LIBRESSL_SKIP_INSTALL, if not set becomes ENABLE_LIBRESSL_INSTALL so this by default is enabled.  defining LIBRESSL_SKIP_INSTALL before hand will disable all install() rules.
This is useful if another project includes and links to this statically.
I chose to add a prefix to avoid potential name collision because the options are cached globally.

If the installation is skipped, maybe it should also disable building apps?  I didn't do that.

1 files changed, 6 insertions, 2 deletions

diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index f8c5684..a2b4817 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -829,9 +829,13 @@ if (BUILD_SHARED)
                 ARCHIVE_OUTPUT_NAME crypto${CRYPTO_POSTFIX})
         set_target_properties(crypto-shared PROPERTIES VERSION
                 ${CRYPTO_VERSION} SOVERSION ${CRYPTO_MAJOR_VERSION})
-        install(TARGETS crypto crypto-shared DESTINATION lib)
+        if(ENABLE_LIBRESSL_INSTALL)
+                install(TARGETS crypto crypto-shared DESTINATION lib)
+        endif(ENABLE_LIBRESSL_INSTALL)
 else()
         add_library(crypto STATIC ${CRYPTO_SRC})
-        install(TARGETS crypto DESTINATION lib)
+        if(ENABLE_LIBRESSL_INSTALL)
+                install(TARGETS crypto DESTINATION lib)
+        endif(ENABLE_LIBRESSL_INSTALL)
 endif()