cmake: consolidate Valgrind option

OpenSSL doesn't initialize bytes on purpose in order to generate
additional entropy. Valgrind isn't too happy about that though, causing
it to generate warninings about various issues regarding use of
uninitialized bytes.

We traditionally had some infrastructure to silence these errors in our
OpenSSL stream implementation, where we invoke the Valgrind macro
`VALGRIND_MAKE_MEMDEFINED` in various callbacks that we provide to
OpenSSL. Naturally, we only include these instructions if a preprocessor
define "VALGRIND" is set, and that in turn is only set if passing
"-DVALGRIND" to CMake. We do that in our usual Azure pipelines, but we
in fact forgot to do this in our nightly build. As a result, we get a
slew of warnings for these nightly builds, but not for our normal
builds.

To fix this, we could just add "-DVALGRIND" to our nightly builds. But
starting with commit d827b11b6 (tests: execute leak checker via CTest
directly, 2019-06-28), we do have a secondary variable that directs
whether we want to use memory sanitizers for our builds. As such, every
user wishing to use Valgrind for our tests needs to pass both options
"VALGRIND" and "USE_LEAK_CHECKER", which is cumbersome and error prone,
as can be seen by our own builds.

Instead, let's consolidate this into a single option, removing the old
"-DVALGRIND" one. Instead, let's just add the preprocessor directive if
USE_LEAK_CHECKER equals "valgrind" and remove "-DVALGRIND" from our own
pipelines.

CMakeLists.txt

@@ -58,7 +58,6 @@ OPTION(USE_SHA1				"Enable SHA1. Can be set to CollisionDetection(ON)/HTTPS/Gene
 OPTION(USE_GSSAPI			"Link with libgssapi for SPNEGO auth"			OFF)
 OPTION(USE_STANDALONE_FUZZERS		"Enable standalone fuzzers (compatible with gcc)"	OFF)
 OPTION(USE_LEAK_CHECKER			"Run tests with leak checker"				OFF)
-OPTION(VALGRIND				"Configure build for valgrind"				OFF)
 OPTION(DEBUG_POOL			"Enable debug pool allocator"				OFF)
 OPTION(ENABLE_WERROR			"Enable compilation with -Werror"			OFF)
 OPTION(USE_BUNDLED_ZLIB    		"Use the bundled version of zlib"			OFF)

azure-pipelines.yml

@@ -19,7 +19,7 @@ jobs:
       environmentVariables: |
        CC=gcc
        CMAKE_GENERATOR=Ninja
-       CMAKE_OPTIONS=-DUSE_HTTPS=OpenSSL -DREGEX_BACKEND=builtin -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DVALGRIND=on -DUSE_GSSAPI=ON
+       CMAKE_OPTIONS=-DUSE_HTTPS=OpenSSL -DREGEX_BACKEND=builtin -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
        GITTEST_NEGOTIATE_PASSWORD=${{ variables.GITTEST_NEGOTIATE_PASSWORD }}
 
 - job: linux_amd64_xenial_gcc_mbedtls
@@ -35,7 +35,7 @@ jobs:
       environmentVariables: |
        CC=gcc
        CMAKE_GENERATOR=Ninja
-       CMAKE_OPTIONS=-DUSE_HTTPS=mbedTLS -DUSE_SHA1=HTTPS -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DVALGRIND=on -DUSE_GSSAPI=ON
+       CMAKE_OPTIONS=-DUSE_HTTPS=mbedTLS -DUSE_SHA1=HTTPS -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
        GITTEST_NEGOTIATE_PASSWORD=${{ variables.GITTEST_NEGOTIATE_PASSWORD }}
 
 - job: linux_amd64_xenial_clang_openssl
@@ -51,7 +51,7 @@ jobs:
       environmentVariables: |
        CC=clang
        CMAKE_GENERATOR=Ninja
-       CMAKE_OPTIONS=-DUSE_HTTPS=OpenSSL -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DVALGRIND=on -DUSE_GSSAPI=ON
+       CMAKE_OPTIONS=-DUSE_HTTPS=OpenSSL -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
        GITTEST_NEGOTIATE_PASSWORD=${{ variables.GITTEST_NEGOTIATE_PASSWORD }}
 
 - job: linux_amd64_xenial_clang_mbedtls
@@ -67,7 +67,7 @@ jobs:
       environmentVariables: |
        CC=clang
        CMAKE_GENERATOR=Ninja
-       CMAKE_OPTIONS=-DUSE_HTTPS=mbedTLS -DUSE_SHA1=HTTPS -DREGEX_BACKEND=pcre -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DVALGRIND=on -DUSE_GSSAPI=ON
+       CMAKE_OPTIONS=-DUSE_HTTPS=mbedTLS -DUSE_SHA1=HTTPS -DREGEX_BACKEND=pcre -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
        GITTEST_NEGOTIATE_PASSWORD=${{ variables.GITTEST_NEGOTIATE_PASSWORD }}
 
 - job: macos

src/CMakeLists.txt

@@ -288,14 +288,13 @@ IF (WIN32 AND NOT CYGWIN)
 ELSEIF (AMIGA)
 	ADD_DEFINITIONS(-DNO_ADDRINFO -DNO_READDIR_R -DNO_MMAP)
 ELSE()
-	ADD_FEATURE_INFO(valgrind VALGRIND "valgrind hints")
-	IF (VALGRIND)
-		ADD_DEFINITIONS(-DVALGRIND)
-	ENDIF()
-
 	FILE(GLOB SRC_OS unix/*.c unix/*.h)
 ENDIF()
 
+IF (USE_LEAK_CHECKER STREQUAL "valgrind")
+	ADD_DEFINITIONS(-DVALGRIND)
+ENDIF()
+
 FILE(GLOB SRC_GIT2 *.c *.h
 	allocators/*.c allocators/*.h
 	streams/*.c streams/*.h