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tools: cmake: link librt if needed (FS#381)

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Patch cmakes cmcurl component to unconditionally link librt when we discover
a clock_gettime() symbol in -lrt.

This is required to sucessfully link LibreSSL's libcrypto which might or
might not reqauire librt.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2017-01-11 03:41:10 +01:00
parent 69be65b594
commit 43d5339940
2 changed files with 33 additions and 3 deletions
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4
tools/cmake/Makefile
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@ -20,9 +20,7 @@ HOST_CONFIGURE_PARALLEL:=1
include $(INCLUDE_DIR)/host-build.mk
HOST_CONFIGURE_CMD := \
MAKEFLAGS="$(HOST_JOBS)" \
LDFLAGS="$$$$(pkg-config --static --libs libcrypto)" \
$(BASH) ./configure
MAKEFLAGS="$(HOST_JOBS)" $(BASH) ./configure
HOST_CONFIGURE_VARS :=

32
tools/cmake/patches/140-curl-fix-libressl-linking.patch Normal file
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@ -0,0 +1,32 @@
From: Jo-Philipp Wich <jo@mein.io>
Date: Wed, 11 Jan 2017 03:36:04 +0100
Subject: [PATCH] cmcurl: link librt
When cmake is linked against LibreSSL, there might be an indirect
dependency on librt on certain systems if LibreSSL's libcrypto uses
clock_gettime() from librt:
[ 28%] Linking C executable LIBCURL
.../lib/libcrypto.a(getentropy_linux.o): In function `getentropy_fallback':
getentropy_linux.c:(.text+0x16d): undefined reference to `clock_gettime'
getentropy_linux.c:(.text+0x412): undefined reference to `clock_gettime'
collect2: error: ld returned 1 exit status
make[5]: *** [Utilities/cmcurl/LIBCURL] Error 1
Modify the cmcurl CMakeLists.txt to check for clock_gettime() in librt
and unconditionally link the rt library when the symbol is found.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
--- a/Utilities/cmcurl/CMakeLists.txt
+++ b/Utilities/cmcurl/CMakeLists.txt
@@ -362,6 +362,10 @@ set(HAVE_LIBSSL OFF)
if(CMAKE_USE_OPENSSL)
find_package(OpenSSL)
if(OPENSSL_FOUND)
+ check_library_exists("rt" clock_gettime "" HAVE_LIBRT)
+ if(HAVE_LIBRT)
+ list(APPEND OPENSSL_LIBRARIES rt)
+ endif()
list(APPEND CURL_LIBS ${OPENSSL_LIBRARIES})
set(USE_OPENSSL ON)
set(HAVE_LIBCRYPTO ON)