Build: Add very limited experimental CMake support.

This version matches CMake files in the master branch (commit
265daa873c0d871f5f23f9b56e133a6f20045a0a) except that this omits
two source files that aren't in v5.2 and in the beginning of
CMakeLists.txt the first paragraph in the comment is slightly
different to point out possible issues in building shared liblzma.

1 files changed, 150 insertions, 0 deletions

diff --git a/cmake/tuklib_physmem.cmake b/cmake/tuklib_physmem.cmake
new file mode 100644
index 00000000..ea5bcc46
--- /dev/null
+++ b/cmake/tuklib_physmem.cmake
@@ -0,0 +1,150 @@
+#
+# tuklib_physmem.cmake - see tuklib_physmem.m4 for description and comments
+#
+# NOTE: Compared tuklib_physmem.m4, this lacks support for Tru64, IRIX, and
+# Linux sysinfo() (usually sysconf() is used on GNU/Linux).
+#
+# Author: Lasse Collin
+#
+# This file has been put into the public domain.
+# You can do whatever you want with this file.
+#
+
+include("${CMAKE_CURRENT_LIST_DIR}/tuklib_common.cmake")
+include(CheckCSourceCompiles)
+include(CheckIncludeFile)
+
+function(tuklib_physmem_internal_check)
+    # Shortcut on Windows:
+    if(WIN32 OR CYGWIN)
+        # Nothing to do, the tuklib_physmem.c handles it.
+        set(TUKLIB_PHYSMEM_DEFINITIONS "" CACHE INTERNAL "")
+        return()
+    endif()
+
+    # Full check for special cases:
+    check_c_source_compiles("
+            #if defined(_WIN32) || defined(__CYGWIN__) || defined(__OS2__) \
+                || defined(__DJGPP__) || defined(__VMS) \
+                || defined(AMIGA) || defined(__AROS__) || defined(__QNX__)
+            int main(void) { return 0; }
+            #else
+            compile error
+            #endif
+        "
+        TUKLIB_PHYSMEM_SPECIAL)
+    if(TUKLIB_PHYSMEM_SPECIAL)
+        # Nothing to do, the tuklib_physmem.c handles it.
+        set(TUKLIB_PHYSMEM_DEFINITIONS "" CACHE INTERNAL "")
+        return()
+    endif()
+
+    # Look for AIX-specific solution before sysconf(), because the test
+    # for sysconf() will pass on AIX but won't actually work
+    # (sysconf(_SC_PHYS_PAGES) compiles but always returns -1 on AIX).
+    check_c_source_compiles("
+            #include <sys/systemcfg.h>
+            int main(void)
+            {
+                (void)_system_configuration.physmem;
+                return 0;
+            }
+        "
+        TUKLIB_PHYSMEM_AIX)
+    if(TUKLIB_PHYSMEM_AIX)
+        set(TUKLIB_PHYSMEM_DEFINITIONS "TUKLIB_PHYSMEM_AIX" CACHE INTERNAL "")
+        return()
+    endif()
+
+    # sysconf()
+    check_c_source_compiles("
+            #include <unistd.h>
+            int main(void)
+            {
+                long i;
+                i = sysconf(_SC_PAGESIZE);
+                i = sysconf(_SC_PHYS_PAGES);
+                return 0;
+            }
+        "
+        TUKLIB_PHYSMEM_SYSCONF)
+    if(TUKLIB_PHYSMEM_SYSCONF)
+        set(TUKLIB_PHYSMEM_DEFINITIONS "TUKLIB_PHYSMEM_SYSCONF"
+            CACHE INTERNAL "")
+        return()
+    endif()
+
+    # sysctl()
+    check_include_file(sys/param.h HAVE_SYS_PARAM_H)
+    if(HAVE_SYS_PARAM_H)
+        list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_SYS_PARAM_H)
+    endif()
+
+    check_c_source_compiles("
+            #ifdef HAVE_SYS_PARAM_H
+            #   include <sys/param.h>
+            #endif
+            #include <sys/sysctl.h>
+            int main(void)
+            {
+                int name[2] = { CTL_HW, HW_PHYSMEM };
+                unsigned long mem;
+                size_t mem_ptr_size = sizeof(mem);
+                sysctl(name, 2, &mem, &mem_ptr_size, NULL, 0);
+                return 0;
+            }
+        "
+        TUKLIB_PHYSMEM_SYSCTL)
+    if(TUKLIB_PHYSMEM_SYSCTL)
+        if(HAVE_SYS_PARAM_H)
+            set(TUKLIB_PHYSMEM_DEFINITIONS
+                "HAVE_PARAM_H;TUKLIB_PHYSMEM_SYSCTL"
+                CACHE INTERNAL "")
+        else()
+            set(TUKLIB_PHYSMEM_DEFINITIONS
+                "TUKLIB_PHYSMEM_SYSCTL"
+                CACHE INTERNAL "")
+        endif()
+        return()
+    endif()
+
+    # HP-UX
+    check_c_source_compiles("
+            #include <sys/param.h>
+            #include <sys/pstat.h>
+            int main(void)
+            {
+                struct pst_static pst;
+                pstat_getstatic(&pst, sizeof(pst), 1, 0);
+                (void)pst.physical_memory;
+                (void)pst.page_size;
+                return 0;
+            }
+        "
+        TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
+    if(TUKLIB_PHYSMEM_PSTAT_GETSTATIC)
+        set(TUKLIB_PHYSMEM_DEFINITIONS "TUKLIB_PHYSMEM_PSTAT_GETSTATIC"
+            CACHE INTERNAL "")
+        return()
+    endif()
+endfunction()
+
+function(tuklib_physmem TARGET_OR_ALL)
+    if(NOT DEFINED CACHE{TUKLIB_PHYSMEM_FOUND})
+        message(STATUS "Checking how to detect the amount of physical memory")
+        tuklib_physmem_internal_check()
+
+        if(DEFINED CACHE{TUKLIB_PHYSMEM_DEFINITIONS})
+            set(TUKLIB_PHYSMEM_FOUND 1 CACHE INTERNAL "")
+        else()
+            set(TUKLIB_PHYSMEM_FOUND 0 CACHE INTERNAL "")
+            message(WARNING
+                "No method to detect the amount of physical memory was found")
+        endif()
+    endif()
+
+    if(TUKLIB_PHYSMEM_FOUND)
+        tuklib_add_definitions("${TARGET_OR_ALL}"
+                               "${TUKLIB_PHYSMEM_DEFINITIONS}")
+    endif()
+endfunction()