[Fix] Always use shmem on linux

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 608f5d5df43f435e6aee8ceeae90a8d04a653ec9..a2c539cea0b500f426af133698d8497fbd2d1859 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1051,47 +1051,53 @@ ELSE()
        MESSAGE(STATUS "atomic builtins are supported")
 ENDIF()
 
-CHECK_C_SOURCE_RUNS("
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <unistd.h>
-#define TEST_NAME \"/test-shmem-work\"
-int
-main (int argc, char **argv)
-{
-  int fd;
-
-  fd = shm_open (TEST_NAME, O_RDWR | O_CREAT | O_EXCL, 00600);
-  if (fd == -1) {
-    return -1;
-  }
-  if (ftruncate (fd, 100) == -1) {
-    shm_unlink (TEST_NAME);
-    close (fd);
-    return -1;
-  }
-
-  if (ftruncate (fd, 200) == -1) {
-    shm_unlink (TEST_NAME);
-    close (fd);
-    return -1;
-  }
-  if (ftruncate (fd, 300) == -1) {
-    shm_unlink (TEST_NAME);
-    close (fd);
-    return -1;
-  }
-
-  close (fd);
-  shm_unlink (TEST_NAME);
-  return 0;
-}
-" HAVE_SANE_SHMEM)
-
-IF(NOT HAVE_SANE_SHMEM)
-       MESSAGE(STATUS "shmem support is NOT compatible with POSIX")
+IF(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+       # In linux, we need to mount /run/shm to test which could be unavailable
+       # on a build system. On the other hand, we know that linux has stupid
+       # but compatible shmem support, so we assume this macro as true
+       SET(CACHE HAVE_SANE_SHMEM 1)
 ELSE()
-       MESSAGE(STATUS "shmem support is compatible with POSIX")
+       CHECK_C_SOURCE_RUNS("
+       #include <sys/mman.h>
+       #include <fcntl.h>
+       #include <unistd.h>
+       #define TEST_NAME \"/test-shmem-work\"
+       int
+       main (int argc, char **argv)
+       {
+         int fd;
+
+         fd = shm_open (TEST_NAME, O_RDWR | O_CREAT | O_EXCL, 00600);
+         if (fd == -1) {
+           return -1;
+         }
+         if (ftruncate (fd, 100) == -1) {
+           shm_unlink (TEST_NAME);
+           close (fd);
+           return -1;
+         }
+
+         if (ftruncate (fd, 200) == -1) {
+           shm_unlink (TEST_NAME);
+           close (fd);
+           return -1;
+         }
+         if (ftruncate (fd, 300) == -1) {
+           shm_unlink (TEST_NAME);
+           close (fd);
+           return -1;
+         }
+
+         close (fd);
+         shm_unlink (TEST_NAME);
+         return 0;
+       }
+       " HAVE_SANE_SHMEM)
+       IF(NOT HAVE_SANE_SHMEM)
+               MESSAGE(STATUS "shmem support is NOT compatible with POSIX")
+       ELSE()
+               MESSAGE(STATUS "shmem support is compatible with POSIX")
+       ENDIF()
 ENDIF()
 
 # Check queue.h compatibility