sets up checkers

checkers/check_crc32c.c

@@ -0,0 +1,9 @@
+#include <crc32c/crc32c.h>
+
+int main(int argc, char** argv)
+{
+  char* buffer;
+  size_t size;
+  ::crc32c::Extend(0, buffer, size);
+  return 0;
+}

tests/compileme.c → checkers/check_fdatasync.c

@@ -5,4 +5,3 @@ int main(int argc, char** argv)
   fdatasync(-1);
   return 0;
 }
-

tests/compileme2.c → checkers/check_fullfsync.c

@@ -5,4 +5,3 @@ int main(int argc, char** argv)
   int i = F_FULLSYNC;
   return 0;
 }
-

tests/compileme3.c → checkers/check_ocloexec.c

@@ -5,4 +5,3 @@ int main(int argc, char** argv)
   int i = O_CLOEXEC;
   return 0;
 }
-

checkers/check_snappy.c

@@ -0,0 +1,10 @@
+#include <snappy.h>
+
+int main(int argc, char** argv)
+{
+  char* input;
+  size_t length;
+  size_t result;
+  snappy::GetUncompressedLength(input, length, &result);
+  return 0;
+}

checkers/check_zstd.c

@@ -0,0 +1,8 @@
+#include <zstd.h>
+
+int main(int argc, char** argv)
+{
+  size_t length;
+  ZSTD_compressBound(length);
+  return 0;
+}

leveldbstatic/prelude.nim

@@ -3,6 +3,7 @@ import os
 const root = currentSourcePath.parentDir.parentDir
 const envWindows = root/"vendor"/"util"/"env_windows.cc"
 const envPosix = root/"vendor"/"util"/"env_posix.cc"
+const checkers = root/"checkers"
 
 when defined(windows):
   {.compile: envWindows.}
@@ -15,11 +16,18 @@ when defined(posix):
   {.passc: "-DLEVELDB_PLATFORM_POSIX".}
 
 
-{.passc: "-DHAVE_FDATASYNC=0".}
-{.passc: "-DHAVE_FULLFSYNC=0".}
-{.passc: "-DHAVE_O_CLOEXEC=0".}
-{.passc: "-DHAVE_CRC32C=0".}
-{.passc: "-DHAVE_SNAPPY=0".}
-{.passc: "-DHAVE_ZSTD=0".}
-{.passc: "-DHAVE_Zstd=0".}
+static:
+  proc doesCompile(cfile: string): int =
+    let rv = gorgeEx("gcc " & cfile)
+    if rv[1] == 0:
+      return 1
+    return 0
+
+  {.passc: "-DHAVE_FDATASYNC=" & $doesCompile(checkers/"check_fdatasync.c").}
+  {.passc: "-DHAVE_FULLFSYNC=" & $doesCompile(checkers/"check_fullfsync.c").}
+  {.passc: "-DHAVE_O_CLOEXEC=" & $doesCompile(checkers/"check_ocloexec.c").}
+  {.passc: "-DHAVE_CRC32C=" & $doesCompile(checkers/"check_crc32c.c").}
+  {.passc: "-DHAVE_SNAPPY=" & $doesCompile(checkers/"check_snappy.c").}
+  {.passc: "-DHAVE_ZSTD=" & $doesCompile(checkers/"check_zstd.c").}
+  {.passc: "-DHAVE_Zstd=" & $doesCompile(checkers/"check_zstd.c").}