# System autoconfiguration. Try: ./configure --help

use cc cc-lib

options {
    with-openssl:path|auto|tree|none
                         => {Look for OpenSSL in the given path, automatically, in the source tree, or none}
    with-miniz=0         => {Use miniz from the source tree}
    with-zlib:path|auto|tree
                         => {Look for zlib in the given path, automatically, or in the source tree}
    with-exec-rel-paths=0
                         => {Enable relative paths for external diff/gdiff}
    with-legacy-mv-rm=0  => {Enable legacy behavior for mv/rm (skip checkout files)}
    with-th1-docs=0      => {Enable TH1 for embedded documentation pages}
    with-th1-hooks=0     => {Enable TH1 hooks for commands and web pages}
    with-tcl:path        => {Enable Tcl integration, with Tcl in the specified path}
    with-tcl-stubs=0     => {Enable Tcl integration via stubs library mechanism}
    with-tcl-private-stubs=0
                         => {Enable Tcl integration via private stubs mechanism}
    with-see=0           => {Enable the SQLite Encryption Extension (SEE)}
    internal-sqlite=1    => {Don't use the internal SQLite, use the system one}
    static=0             => {Link a static executable}
    fusefs=1             => {Disable the Fuse Filesystem}
    fossil-debug=0       => {Build with fossil debugging enabled}
    json=0               => {Build with fossil JSON API enabled}
}

# sqlite wants these types if possible
cc-with {-includes {stdint.h inttypes.h}} {
    cc-check-types uint32_t uint16_t int16_t uint8_t
}

# Use pread/pwrite system calls in place of seek + read/write if possible
define USE_PREAD [cc-check-functions pread]

# Find tclsh for the test suite. Can't yet use jimsh for this.
cc-check-progs tclsh

define EXTRA_CFLAGS ""
define EXTRA_LDFLAGS ""
define USE_SYSTEM_SQLITE 0
define USE_LINENOISE 0
define FOSSIL_ENABLE_MINIZ 0
define USE_SEE 0

# This procedure is a customized version of "cc-check-function-in-lib",
# that does not modify the LIBS variable.  Its use prevents prematurely
# pulling in libraries that will be added later anyhow (e.g. "-ldl").
proc check-function-in-lib {function libs {otherlibs {}}} {
    if {[string length $otherlibs]} {
        msg-checking "Checking for $function in $libs with $otherlibs..."
    } else {
        msg-checking "Checking for $function in $libs..."
    }
    set found 0
    cc-with [list -libs $otherlibs] {
        if {[cctest_function $function]} {
            msg-result "none needed"
            define lib_$function ""
            incr found
        } else {
            foreach lib $libs {
                cc-with [list -libs -l$lib] {
                    if {[cctest_function $function]} {
                        msg-result -l$lib
                        define lib_$function -l$lib
                        incr found
                        break
                    }
                }
            }
        }
    }
    if {$found} {
        define [feature-define-name $function]
    } else {
        msg-result "no"
    }
    return $found
}

if {![opt-bool internal-sqlite]} {
  proc find_internal_sqlite {} {

    # On some systems (slackware), libsqlite3 requires -ldl to link. So
    # search for the system SQLite once with -ldl, and once without. If
    # the library can only be found with $extralibs set to -ldl, then
    # the code below will append -ldl to LIBS.
    #
    foreach extralibs {{} {-ldl}} {

      # Locate the system SQLite by searching for sqlite3_open(). Then check
      # if sqlite3_trace_v2() can be found as well. If we can find open() but
      # not trace_v2(), then the system SQLite is too old to link against
      # fossil.
      #
      if {[check-function-in-lib sqlite3_open sqlite3 $extralibs]} {
        if {![check-function-in-lib sqlite3_trace_v2 sqlite3 $extralibs]} {
          user-error "system sqlite3 too old (require >= 3.14.0)"
        }

        # Success. Update symbols and return.
        #
        define USE_SYSTEM_SQLITE 1
        define-append LIBS -lsqlite3
        define-append LIBS $extralibs
        return
      }
    }
    user-error "system sqlite3 not found"
  }

  find_internal_sqlite
}

proc is_mingw {} {
    return [string match *mingw* [get-define host]]
}

if {[is_mingw]} {
    define-append EXTRA_CFLAGS -DBROKEN_MINGW_CMDLINE
    define-append LIBS -lkernel32 -lws2_32
} else {
    #
    # NOTE: All platforms except MinGW should use the linenoise
    #       package.  It is currently unsupported on Win32.
    #
    define USE_LINENOISE 1
}

if {[string match *-solaris* [get-define host]]} {
    define-append EXTRA_CFLAGS {-D_XOPEN_SOURCE=500 -D__EXTENSIONS__}
}

if {[opt-bool fossil-debug]} {
    define-append EXTRA_CFLAGS -DFOSSIL_DEBUG
    msg-result "Debugging support enabled"
}

if {[opt-bool with-see]} {
    define-append EXTRA_CFLAGS -DUSE_SEE
    define USE_SEE 1
    msg-result "Enabling encryption support"
}

if {[opt-bool json]} {
    # Reminder/FIXME (stephan): FOSSIL_ENABLE_JSON
    # is required in the CFLAGS because json*.c
    # have #ifdef guards around the whole file without
    # reading config.h first.
    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_JSON
    define FOSSIL_ENABLE_JSON
    msg-result "JSON support enabled"
}

if {[opt-bool with-legacy-mv-rm]} {
    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_LEGACY_MV_RM
    define FOSSIL_ENABLE_LEGACY_MV_RM
    msg-result "Legacy mv/rm support enabled"
}

if {[opt-bool with-exec-rel-paths]} {
    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_EXEC_REL_PATHS
    define FOSSIL_ENABLE_EXEC_REL_PATHS
    msg-result "Relative paths in external diff/gdiff enabled"
}

if {[opt-bool with-th1-docs]} {
    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_TH1_DOCS
    define FOSSIL_ENABLE_TH1_DOCS
    msg-result "TH1 embedded documentation support enabled"
}

if {[opt-bool with-th1-hooks]} {
    define-append EXTRA_CFLAGS -DFOSSIL_ENABLE_TH1_HOOKS
    define FOSSIL_ENABLE_TH1_HOOKS
    msg-result "TH1 hooks support enabled"
}

#if {[opt-bool markdown]} {
#    # no-op.  Markdown is now enabled by default.
#    msg-result "Markdown support enabled"
#}

if {[opt-bool static]} {
    # XXX: This will not work on all systems.
    define-append EXTRA_LDFLAGS -static
    msg-result "Trying to link statically"
} else {
    define-append EXTRA_CFLAGS -DFOSSIL_DYNAMIC_BUILD=1
    define FOSSIL_DYNAMIC_BUILD
}

# Helper for OpenSSL checking
proc check-for-openssl {msg {cflags {}} {libs {-lssl -lcrypto}}} {
    msg-checking "Checking for $msg..."
    set rc 0
    if {[is_mingw]} {
        lappend libs -lgdi32 -lwsock32 -lcrypt32
    }
    if {[info exists ::zlib_lib]} {
        lappend libs $::zlib_lib
    }
    msg-quiet cc-with [list -cflags $cflags -libs $libs] {
        if {[cc-check-includes openssl/ssl.h] && \
                [cc-check-functions SSL_new]} {
            incr rc
        }
    }
    if {!$rc && ![is_mingw]} {
        # On some systems, OpenSSL appears to require -ldl to link.
        lappend libs -ldl
        msg-quiet cc-with [list -cflags $cflags -libs $libs] {
            if {[cc-check-includes openssl/ssl.h] && \
                    [cc-check-functions SSL_new]} {
                incr rc
            }
        }
    }
    if {$rc} {
        msg-result "ok"
        return 1
    } else {
        msg-result "no"
        return 0
    }
}

if {[opt-bool with-miniz]} {
    define FOSSIL_ENABLE_MINIZ 1
    msg-result "Using miniz for compression"
} else {
    # Check for zlib, using the given location if specified
    set zlibpath [opt-val with-zlib]
    if {$zlibpath eq "tree"} {
        set zlibdir [file dirname $autosetup(dir)]/compat/zlib
        if {![file isdirectory $zlibdir]} {
            user-error "The zlib in source tree directory does not exist"
        }
        cc-with [list -cflags "-I$zlibdir -L$zlibdir"]
        define-append EXTRA_CFLAGS -I$zlibdir
        define-append LIBS $zlibdir/libz.a
        set ::zlib_lib $zlibdir/libz.a
        msg-result "Using zlib in source tree"
    } else {
        if {$zlibpath ni {auto ""}} {
            cc-with [list -cflags "-I$zlibpath -L$zlibpath"]
            define-append EXTRA_CFLAGS -I$zlibpath
            define-append EXTRA_LDFLAGS -L$zlibpath
            msg-result "Using zlib from $zlibpath"
        }
        if {![cc-check-includes zlib.h] || ![check-function-in-lib inflateEnd z]} {
            user-error "zlib not found please install it or specify the location with --with-zlib"
        }
        set ::zlib_lib -lz
    }
}

set ssldirs [opt-val with-openssl]
if {$ssldirs ne "none"} {
    if {[opt-bool with-miniz]} {
        user-error "The --with-miniz option is incompatible with OpenSSL"
    }
    set found 0
    if {$ssldirs eq "tree"} {
        set ssldir [file dirname $autosetup(dir)]/compat/openssl
        if {![file isdirectory $ssldir]} {
            user-error "The OpenSSL in source tree directory does not exist"
        }
        set msg "ssl in $ssldir"
        set cflags "-I$ssldir/include"
        set ldflags "-L$ssldir"
        set ssllibs "$ssldir/libssl.a $ssldir/libcrypto.a"
        set found [check-for-openssl "ssl in source tree" "$cflags $ldflags" $ssllibs]
    } else {
        if {$ssldirs in {auto ""}} {
            catch {
                set cflags [exec pkg-config openssl --cflags-only-I]
                set ldflags [exec pkg-config openssl --libs-only-L]
                set found [check-for-openssl "ssl via pkg-config" "$cflags $ldflags"]
            } msg
            if {!$found} {
                set ssldirs "{} /usr/sfw /usr/local/ssl /usr/lib/ssl /usr/ssl \
                             /usr/pkg /usr/local /usr /usr/local/opt/openssl"
            }
        }
        if {!$found} {
            foreach dir $ssldirs {
                if {$dir eq ""} {
                    set msg "system ssl"
                    set cflags ""
                    set ldflags ""
                } else {
                    set msg "ssl in $dir"
                    set cflags "-I$dir/include"
                    set ldflags "-L$dir/lib"
                }
                if {[check-for-openssl $msg "$cflags $ldflags"]} {
                    incr found
                    break
                }
            }
        }
    }
    if {$found} {
        define FOSSIL_ENABLE_SSL
        define-append EXTRA_CFLAGS $cflags
        define-append EXTRA_LDFLAGS $ldflags
        if {[info exists ssllibs]} {
            define-append LIBS $ssllibs
        } else {
            define-append LIBS -lssl -lcrypto
        }
        if {[info exists ::zlib_lib]} {
            define-append LIBS $::zlib_lib
        }
        if {[is_mingw]} {
            define-append LIBS -lgdi32 -lwsock32 -lcrypt32
        }
        msg-result "HTTPS support enabled"

        # Silence OpenSSL deprecation warnings on Mac OS X 10.7.
        if {[string match *-darwin* [get-define host]]} {
            if {[cctest -cflags {-Wdeprecated-declarations}]} {
                define-append EXTRA_CFLAGS -Wdeprecated-declarations
            }
        }
    } else {
        user-error "OpenSSL not found. Consider --with-openssl=none to disable HTTPS support"
    }
} else {
    if {[info exists ::zlib_lib]} {
        define-append LIBS $::zlib_lib
    }
}

set tclpath [opt-val with-tcl]
if {$tclpath ne ""} {
    set tclprivatestubs [opt-bool with-tcl-private-stubs]
    # Note parse-tclconfig-sh is in autosetup/local.tcl
    if {$tclpath eq "1"} {
        set tcldir [file dirname $autosetup(dir)]/compat/tcl-8.6
        if {$tclprivatestubs} {
            set tclconfig(TCL_INCLUDE_SPEC) -I$tcldir/generic
            set tclconfig(TCL_VERSION) {Private Stubs}
            set tclconfig(TCL_PATCH_LEVEL) {}
            set tclconfig(TCL_PREFIX) $tcldir
            set tclconfig(TCL_LD_FLAGS) { }
        } else {
            # Use the system Tcl. Look in some likely places.
            array set tclconfig [parse-tclconfig-sh \
                $tcldir/unix $tcldir/win \
                /usr /usr/local /usr/share /opt/local]
            set msg "on your system"
        }
    } else {
        array set tclconfig [parse-tclconfig-sh $tclpath]
        set msg "at $tclpath"
    }
    if {![info exists tclconfig(TCL_INCLUDE_SPEC)]} {
        user-error "Cannot find Tcl $msg"
    }
    set tclstubs [opt-bool with-tcl-stubs]
    if {$tclprivatestubs} {
        define FOSSIL_ENABLE_TCL_PRIVATE_STUBS
        define USE_TCL_STUBS
    } elseif {$tclstubs && $tclconfig(TCL_SUPPORTS_STUBS)} {
        set libs "$tclconfig(TCL_STUB_LIB_SPEC)"
        define FOSSIL_ENABLE_TCL_STUBS
        define USE_TCL_STUBS
    } else {
        set libs "$tclconfig(TCL_LIB_SPEC) $tclconfig(TCL_LIBS)"
    }
    set cflags $tclconfig(TCL_INCLUDE_SPEC)
    if {!$tclprivatestubs} {
        set foundtcl 0; # Did we find a working Tcl library?
        cc-with [list -cflags $cflags -libs $libs] {
            if {$tclstubs} {
                if {[cc-check-functions Tcl_InitStubs]} {
                    set foundtcl 1
                }
            } else {
                if {[cc-check-functions Tcl_CreateInterp]} {
                    set foundtcl 1
                }
            }
        }
        if {!$foundtcl && [string match *-lieee* $libs]} {
            # On some systems, using "-lieee" from TCL_LIB_SPEC appears
            # to cause issues.
            msg-result "Removing \"-lieee\" and retrying for Tcl..."
            set libs [string map [list -lieee ""] $libs]
            cc-with [list -cflags $cflags -libs $libs] {
                if {$tclstubs} {
                    if {[cc-check-functions Tcl_InitStubs]} {
                        set foundtcl 1
                    }
                } else {
                    if {[cc-check-functions Tcl_CreateInterp]} {
                        set foundtcl 1
                    }
                }
            }
        }
        if {!$foundtcl && ![string match *-lpthread* $libs]} {
            # On some systems, TCL_LIB_SPEC appears to be missing
            # "-lpthread".  Try adding it.
            msg-result "Adding \"-lpthread\" and retrying for Tcl..."
            set libs "$libs -lpthread"
            cc-with [list -cflags $cflags -libs $libs] {
                if {$tclstubs} {
                    if {[cc-check-functions Tcl_InitStubs]} {
                        set foundtcl 1
                    }
                } else {
                    if {[cc-check-functions Tcl_CreateInterp]} {
                        set foundtcl 1
                    }
                }
            }
        }
        if {!$foundtcl} {
            if {$tclstubs} {
                user-error "Cannot find a usable Tcl stubs library $msg"
            } else {
                user-error "Cannot find a usable Tcl library $msg"
            }
        }
    }
    set version $tclconfig(TCL_VERSION)$tclconfig(TCL_PATCH_LEVEL)
    msg-result "Found Tcl $version at $tclconfig(TCL_PREFIX)"
    if {!$tclprivatestubs} {
        define-append LIBS $libs
    }
    define-append EXTRA_CFLAGS $cflags
    if {[info exists zlibpath] && $zlibpath eq "tree"} {
      #
      # NOTE: When using zlib in the source tree, prevent Tcl from
      #       pulling in the system one.
      #
      set tclconfig(TCL_LD_FLAGS) [string map [list -lz ""] \
          $tclconfig(TCL_LD_FLAGS)]
    }
    #
    # NOTE: Remove "-ldl" from the TCL_LD_FLAGS because it will be
    #       be checked for near the bottom of this file.
    #
    set tclconfig(TCL_LD_FLAGS) [string map [list -ldl ""] \
        $tclconfig(TCL_LD_FLAGS)]
    define-append EXTRA_LDFLAGS $tclconfig(TCL_LD_FLAGS)
    define FOSSIL_ENABLE_TCL
}

# Network functions require libraries on some systems
cc-check-function-in-lib gethostbyname nsl
if {![cc-check-function-in-lib socket {socket network}]} {
    # Last resort, may be Windows
    if {[is_mingw]} {
        define-append LIBS -lwsock32
    }
}
cc-check-function-in-lib iconv iconv
cc-check-functions utime
cc-check-functions usleep
cc-check-functions strchrnul

# Check for getloadavg(), and if it doesn't exist, define FOSSIL_OMIT_LOAD_AVERAGE
if {![cc-check-functions getloadavg]} {
  define FOSSIL_OMIT_LOAD_AVERAGE 1
  msg-result "Load average support unavailable"
}

# Check for getpassphrase() for Solaris 10 where getpass() truncates to 10 chars
if {![cc-check-functions getpassphrase]} {
    # Haiku needs this
    cc-check-function-in-lib getpass bsd
}
cc-check-function-in-lib dlopen dl
cc-check-function-in-lib sin m

# Check for the FuseFS library
if {[opt-bool fusefs]} {
  if {[cc-check-function-in-lib fuse_mount fuse]} {
     define FOSSIL_HAVE_FUSEFS 1
     define-append LIBS -lfuse
     msg-result "FuseFS support enabled"
  }
}

make-template Makefile.in
make-config-header autoconfig.h -auto {USE_* FOSSIL_*}
