remove dead code elimination option (#7669)

compiler/ast.nim

@@ -262,7 +262,8 @@ type
                       # variable is a thread variable
     sfCompileTime,    # proc can be evaluated at compile time
     sfConstructor,    # proc is a C++ constructor
-    sfDeadCodeElim,   # dead code elimination for the module is turned on
+    sfDispatcher,     # copied method symbol is the dispatcher
+                      # deprecated and unused, except for the con
     sfBorrow,         # proc is borrowed
     sfInfixCall,      # symbol needs infix call syntax in target language;
                       # for interfacing with C++, JS
@@ -275,10 +276,9 @@ type
   TSymFlags* = set[TSymFlag]
 
 const
-  sfDispatcher* = sfDeadCodeElim # copied method symbol is the dispatcher
   sfNoInit* = sfMainModule       # don't generate code to init the variable
 
-  sfImmediate* = sfDeadCodeElim
+  sfImmediate* = sfDispatcher
     # macro or template is immediately expanded
     # without considering any possible overloads
   sfAllUntyped* = sfVolatile # macro or template is immediately expanded \

compiler/ccgexprs.nim

@@ -2264,7 +2264,7 @@ proc expr(p: BProc, n: PNode, d: var TLoc) =
   of nkEmpty: discard
   of nkWhileStmt: genWhileStmt(p, n)
   of nkVarSection, nkLetSection: genVarStmt(p, n)
-  of nkConstSection: genConstStmt(p, n)
+  of nkConstSection: discard  # consts generated lazily on use
   of nkForStmt: internalError(n.info, "for statement not eliminated")
   of nkCaseStmt: genCase(p, n, d)
   of nkReturnStmt: genReturnStmt(p, n)
@@ -2315,8 +2315,7 @@ proc expr(p: BProc, n: PNode, d: var TLoc) =
       # are not transformed correctly. We work around this issue (#411) here
       # by ensuring it's no inner proc (owner is a module):
       if prc.skipGenericOwner.kind == skModule and sfCompileTime notin prc.flags:
-        if (not emitLazily(prc)) or
+        if ({sfExportc, sfCompilerProc} * prc.flags == {sfExportc}) or
-            ({sfExportc, sfCompilerProc} * prc.flags == {sfExportc}) or
             (sfExportc in prc.flags and lfExportLib in prc.loc.flags) or
             (prc.kind == skMethod):
           # we have not only the header:

compiler/ccgstmts.nim

@@ -280,20 +280,6 @@ proc genVarStmt(p: BProc, n: PNode) =
     else:
       genVarTuple(p, it)
 
-proc genConstStmt(p: BProc, n: PNode) =
-  for it in n.sons:
-    if it.kind == nkCommentStmt: continue
-    if it.kind != nkConstDef: internalError(n.info, "genConstStmt")
-
-    let sym = it.sons[0].sym
-    if sym.typ.containsCompileTimeOnly or
-        sym.typ.kind notin ConstantDataTypes or
-        sym.ast.len == 0 or
-        emitLazily(sym):
-      continue
-
-    requestConstImpl(p, sym)
-
 proc genIf(p: BProc, n: PNode, d: var TLoc) =
   #
   #  { if (!expr1) goto L1;

compiler/ccgutils.nim

@@ -211,8 +211,4 @@ proc mangle*(name: string): string =
   if requiresUnderscore:
     result.add "_"
 
-proc emitLazily*(s: PSym): bool {.inline.} =
-  result = optDeadCodeElim in gGlobalOptions or
-           sfDeadCodeElim in getModule(s).flags
-
 initTypeTables()

compiler/cgen.nim

@@ -1309,10 +1309,6 @@ proc newModule(g: BModuleList; module: PSym): BModule =
   growCache g.modules, module.position
   g.modules[module.position] = result
 
-  if (optDeadCodeElim in gGlobalOptions):
-    if (sfDeadCodeElim in module.flags):
-      internalError("added pending module twice: " & toFilename(FileIndex module.position))
-
 template injectG(config) {.dirty.} =
   if graph.backend == nil:
     graph.backend = newModuleList(config)

compiler/commands.nim

@@ -268,7 +268,6 @@ proc testCompileOption*(switch: string, info: TLineInfo): bool =
   of "movechecks": result = contains(gOptions, optMoveCheck)
   of "linedir": result = contains(gOptions, optLineDir)
   of "assertions", "a": result = contains(gOptions, optAssert)
-  of "deadcodeelim": result = contains(gGlobalOptions, optDeadCodeElim)
   of "run", "r": result = contains(gGlobalOptions, optRun)
   of "symbolfiles": result = gSymbolFiles != disabledSf
   of "genscript": result = contains(gGlobalOptions, optGenScript)
@@ -509,7 +508,7 @@ proc processSwitch(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
   of "movechecks": processOnOffSwitch({optMoveCheck}, arg, pass, info)
   of "linedir": processOnOffSwitch({optLineDir}, arg, pass, info)
   of "assertions", "a": processOnOffSwitch({optAssert}, arg, pass, info)
-  of "deadcodeelim": processOnOffSwitchG({optDeadCodeElim}, arg, pass, info)
+  of "deadcodeelim": discard # deprecated, dead code elim always on
   of "threads":
     processOnOffSwitchG({optThreads}, arg, pass, info)
     #if optThreads in gGlobalOptions: incl(gNotes, warnGcUnsafe)

compiler/options.nim

@@ -41,7 +41,8 @@ type                          # please make sure we have under 32 options
 
   TOptions* = set[TOption]
   TGlobalOption* = enum       # **keep binary compatible**
-    gloptNone, optForceFullMake, optDeadCodeElim,
+    gloptNone, optForceFullMake,
+    optDeadCodeElimUnused,    # deprecated, always on
     optListCmd, optCompileOnly, optNoLinking,
     optCDebug,                # turn on debugging information
     optGenDynLib,             # generate a dynamic library

compiler/pragmas.nim

@@ -44,7 +44,9 @@ const
     wWarnings, wHints,
     wLinedir, wStacktrace, wLinetrace, wOptimization, wHint, wWarning, wError,
     wFatal, wDefine, wUndef, wCompile, wLink, wLinksys, wPure, wPush, wPop,
-    wBreakpoint, wWatchPoint, wPassl, wPassc, wDeadCodeElim, wDeprecated,
+    wBreakpoint, wWatchPoint, wPassl, wPassc,
+    wDeadCodeElimUnused,  # deprecated, always on
+    wDeprecated,
     wFloatchecks, wInfChecks, wNanChecks, wPragma, wEmit, wUnroll,
     wLinearScanEnd, wPatterns, wEffects, wNoForward, wReorder, wComputedGoto,
     wInjectStmt, wDeprecated, wExperimental, wThis}
@@ -215,10 +217,6 @@ proc onOff(c: PContext, n: PNode, op: TOptions) =
   if isTurnedOn(c, n): gOptions = gOptions + op
   else: gOptions = gOptions - op
 
-proc pragmaDeadCodeElim(c: PContext, n: PNode) =
-  if isTurnedOn(c, n): incl(c.module.flags, sfDeadCodeElim)
-  else: excl(c.module.flags, sfDeadCodeElim)
-
 proc pragmaNoForward(c: PContext, n: PNode; flag=sfNoForward) =
   if isTurnedOn(c, n): incl(c.module.flags, flag)
   else: excl(c.module.flags, flag)
@@ -764,7 +762,7 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: var int,
       of wThreadVar:
         noVal(it)
         incl(sym.flags, sfThread)
-      of wDeadCodeElim: pragmaDeadCodeElim(c, it)
+      of wDeadCodeElimUnused: discard  # deprecated, dead code elim always on
       of wNoForward: pragmaNoForward(c, it)
       of wReorder: pragmaNoForward(c, it, sfReorder)
       of wMagic: processMagic(c, it, sym)
@@ -960,10 +958,6 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: var int,
         if sym.kind != skType or sym.typ == nil: invalidPragma(it)
         else:
           incl(sym.typ.flags, tfPartial)
-          # .partial types can only work with dead code elimination
-          # to prevent the codegen from doing anything before we compiled
-          # the whole program:
-          incl gGlobalOptions, optDeadCodeElim
       of wInject, wGensym:
         # We check for errors, but do nothing with these pragmas otherwise
         # as they are handled directly in 'evalTemplate'.

compiler/wordrecg.nim

@@ -55,7 +55,8 @@ type
     wFloatchecks, wNanChecks, wInfChecks, wMoveChecks,
     wAssertions, wPatterns, wWarnings,
     wHints, wOptimization, wRaises, wWrites, wReads, wSize, wEffects, wTags,
-    wDeadCodeElim, wSafecode, wPackage, wNoForward, wReorder, wNoRewrite,
+    wDeadCodeElimUnused,  # deprecated, dead code elim always happens
+    wSafecode, wPackage, wNoForward, wReorder, wNoRewrite,
     wPragma,
     wCompileTime, wNoInit,
     wPassc, wPassl, wBorrow, wDiscardable,
@@ -143,7 +144,8 @@ const
 
     "assertions", "patterns", "warnings", "hints",
     "optimization", "raises", "writes", "reads", "size", "effects", "tags",
-    "deadcodeelim", "safecode", "package", "noforward", "reorder", "norewrite",
+    "deadcodeelim",  # deprecated, dead code elim always happens
+    "safecode", "package", "noforward", "reorder", "norewrite",
     "pragma",
     "compiletime", "noinit",
     "passc", "passl", "borrow", "discardable", "fieldchecks",

doc/basicopt.txt

@@ -29,7 +29,6 @@ Options:
   --nanChecks:on|off        turn NaN checks on|off
   --infChecks:on|off        turn Inf checks on|off
   --nilChecks:on|off        turn nil checks on|off
-  --deadCodeElim:on|off     whole program dead code elimination on|off
   --opt:none|speed|size     optimize not at all or for speed|size
                             Note: use -d:release for a release build!
   --debugger:native|endb    use native debugger (gdb) | ENDB (experimental)

doc/manual.rst

@@ -6768,22 +6768,6 @@ the created global variables within a module is not defined, but all of them
 will be initialized after any top-level variables in their originating module
 and before any variable in a module that imports it.
 
-deadCodeElim pragma
--------------------
-The ``deadCodeElim`` pragma only applies to whole modules: It tells the
-compiler to activate (or deactivate) dead code elimination for the module the
-pragma appears in.
-
-The ``--deadCodeElim:on`` command line switch has the same effect as marking
-every module with ``{.deadCodeElim:on}``. However, for some modules such as
-the GTK wrapper it makes sense to *always* turn on dead code elimination -
-no matter if it is globally active or not.
-
-Example:
-
-.. code-block:: nim
-  {.deadCodeElim: on.}
-
 
 ..
   NoForward pragma

doc/nimc.rst

@@ -181,7 +181,7 @@ generated; use the ``--symbolFiles:on`` command line switch to activate them.
 
 Unfortunately due to technical reasons the ``--symbolFiles:on`` needs
 to *aggregate* some generated C code. This means that the resulting executable
-might contain some cruft even when dead code elimination is turned on. So
+might contain some cruft even with dead code elimination. So
 the final release build should be done with ``--symbolFiles:off``.
 
 Due to the aggregation of C code it is also recommended that each project
@@ -439,7 +439,7 @@ target.
 
 For example, to generate code for an `AVR`:idx: processor use this command::
 
-  nim c --cpu:avr --os:standalone --deadCodeElim:on --genScript x.nim
+  nim c --cpu:avr --os:standalone --genScript x.nim
 
 For the ``standalone`` target one needs to provide
 a file ``panicoverride.nim``.

lib/deprecated/pure/sockets.nim

@@ -32,7 +32,7 @@
 
 include "system/inclrtl"
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 when hostOS == "solaris":
   {.passl: "-lsocket -lnsl".}

lib/impure/db_sqlite.nim

@@ -81,7 +81,7 @@
 ##
 ##  theDb.close()
 
-{.deadCodeElim:on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 import strutils, sqlite3
 

lib/impure/rdstdin.nim

@@ -13,7 +13,7 @@
 ## is used. This suffices because Windows' console already provides the
 ## wanted functionality.
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 when defined(Windows):
   proc readLineFromStdin*(prompt: string): TaintedString {.

lib/posix/epoll.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim:on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 from posix import SocketHandle
 

lib/posix/inotify.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim:on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 # Get the platform-dependent flags.
 # Structure describing an inotify event.

lib/posix/kqueue.nim

@@ -7,8 +7,6 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim:on.}
-
 from posix import Timespec
 
 when defined(macosx) or defined(freebsd) or defined(openbsd) or

lib/posix/linux.nim

@@ -1,4 +1,4 @@
-{.deadCodeElim:on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 import posix
 

lib/posix/posix.nim

@@ -27,10 +27,10 @@
 ## resulting C code will just ``#include <XYZ.h>`` and *not* define the
 ## symbols declared here.
 
-# This ensures that we don't accidentally generate #includes for files that
+# Dead code elimination ensures that we don't accidentally generate #includes
-# might not exist on a specific platform! The user will get an error only
+# for files that might not exist on a specific platform! The user will get an
-# if they actualy try to use the missing declaration
+# error only if they actualy try to use the missing declaration
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 # TODO these constants don't seem to be fetched from a header file for unknown
 #      platforms - where do they come from and why are they here?

lib/posix/posix_other.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim:on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 const
   hasSpawnH = not defined(haiku) # should exist for every Posix system nowadays

lib/posix/termios.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 import posix
 
 type

lib/pure/fenv.nim

@@ -10,7 +10,7 @@
 ## Floating-point environment. Handling of floating-point rounding and
 ## exceptions (overflow, division by zero, etc.).
 
-{.deadCodeElim:on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 when defined(Posix) and not defined(haiku):
   {.passl: "-lm".}

lib/pure/matchers.nim

@@ -12,7 +12,7 @@
 ## **Warning:** This module is deprecated since version 0.14.0.
 {.deprecated.}
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 {.push debugger:off .} # the user does not want to trace a part
                        # of the standard library!

lib/pure/net.nim

@@ -68,7 +68,7 @@
 ## ``newSocket()``. The difference is that the latter creates a new file
 ## descriptor.
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 import nativesockets, os, strutils, parseutils, times, sets, options
 export Port, `$`, `==`
 export Domain, SockType, Protocol

lib/pure/os.nim

@@ -10,7 +10,7 @@
 ## This module contains basic operating system facilities like
 ## retrieving environment variables, reading command line arguments,
 ## working with directories, running shell commands, etc.
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 {.push debugger: off.}
 

lib/pure/parseutils.nim

@@ -11,7 +11,7 @@
 ##
 ## To unpack raw bytes look at the `streams <streams.html>`_ module.
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 {.push debugger:off .} # the user does not want to trace a part
                        # of the standard library!

lib/pure/ropes.nim

@@ -19,7 +19,7 @@
 include "system/inclrtl"
 import streams
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 {.push debugger:off .} # the user does not want to trace a part
                        # of the standard library!

lib/pure/strmisc.nim

@@ -12,7 +12,7 @@
 
 import strutils
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 proc expandTabs*(s: string, tabSize: int = 8): string {.noSideEffect,
   procvar.} =

lib/pure/strutils.nim

@@ -17,7 +17,7 @@ import parseutils
 from math import pow, round, floor, log10
 from algorithm import reverse
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 {.push debugger:off .} # the user does not want to trace a part
                        # of the standard library!

lib/pure/unicode.nim

@@ -9,7 +9,7 @@
 
 ## This module provides support to handle the Unicode UTF-8 encoding.
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 include "system/inclrtl"
 

lib/system.nim

@@ -146,7 +146,7 @@ proc declared*(x: untyped): bool {.magic: "Defined", noSideEffect, compileTime.}
   ##     # missing it.
 
 when defined(useNimRtl):
-  {.deadCodeElim: on.}
+  {.deadCodeElim: on.}  # dce option deprecated
 
 proc definedInScope*(x: untyped): bool {.
   magic: "DefinedInScope", noSideEffect, deprecated, compileTime.}

lib/windows/winlean.nim

@@ -10,7 +10,7 @@
 ## This module implements a small wrapper for some needed Win API procedures,
 ## so that the Nim compiler does not depend on the huge Windows module.
 
-{.deadCodeElim:on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 import dynlib
 

lib/wrappers/iup.nim

@@ -34,7 +34,7 @@
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 # ****************************************************************************
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 when defined(windows):
   const dllname = "iup(|30|27|26|25|24).dll"

lib/wrappers/mysql.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 {.push, callconv: cdecl.}
 
 when defined(Unix):

lib/wrappers/odbcsql.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 when not defined(ODBCVER):
   const

lib/wrappers/openssl.nim

@@ -22,7 +22,7 @@
 ##   ./bin/nim c -d:ssl -p:. -r tests/untestable/tssl.nim
 ##   ./bin/nim c -d:ssl -p:. --dynlibOverride:ssl --passL:-lcrypto --passL:-lssl -r tests/untestable/tssl.nim
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 const useWinVersion = defined(Windows) or defined(nimdoc)
 

lib/wrappers/pcre.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 # The current PCRE version information.
 

lib/wrappers/postgres.nim

@@ -15,7 +15,7 @@
 # connection-protocol.
 #
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 
 when defined(windows):
   const

lib/wrappers/sqlite3.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-{.deadCodeElim: on.}
+{.deadCodeElim: on.}  # dce option deprecated
 when defined(windows):
   when defined(nimOldDlls):
     const Lib = "sqlite3.dll"

tests/enum/toptions.nim

@@ -4,7 +4,7 @@ type
   TOption = enum
     optNone, optForceFullMake, optBoehmGC, optRefcGC, optRangeCheck,
     optBoundsCheck, optOverflowCheck, optNilCheck, optAssert, optLineDir,
-    optWarns, optHints, optDeadCodeElim, optListCmd, optCompileOnly,
+    optWarns, optHints, optListCmd, optCompileOnly,
     optSafeCode,             # only allow safe code
     optStyleCheck, optOptimizeSpeed, optOptimizeSize, optGenDynLib,
     optGenGuiApp, optStackTrace

tests/iter/tobj_iter.nim

@@ -4,8 +4,6 @@ discard """
 
 # bug #2023
 
-{.deadCodeElim:on.}
-
 type
     Obj = object
         iter: iterator (): int8 {.closure.}

tests/manyloc/keineschweine/dependencies/chipmunk/chipmunk.nim

@@ -23,7 +23,6 @@ const Lib = "libchipmunk.so.6.1.1"
 
 when defined(MoreNim):
   {.hint: "MoreNim defined; some Chipmunk functions replaced in Nim".}
-{.deadCodeElim: on.}
 from math import sqrt, sin, cos, arctan2
 when defined(CpUseFloat):
   {.hint: "CpUseFloat defined; using float32 as float".}

tests/manyloc/keineschweine/dependencies/enet/enet.nim

@@ -20,7 +20,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 const Lib = "libenet.so.1(|.0.3)"
 
-{.deadCodeElim: on.}
 const
   ENET_VERSION_MAJOR* = 1
   ENET_VERSION_MINOR* = 3

tests/manyloc/keineschweine/dependencies/genpacket/macro_dsl.nim

@@ -1,5 +1,5 @@
 import macros
-{.deadCodeElim: on.}
+
 #Inline macro.add() to allow for easier nesting
 proc und*(a: NimNode; b: NimNode): NimNode {.compileTime.} =
   a.add(b)

tests/manyloc/keineschweine/dependencies/sfml/sfml.nim

@@ -12,7 +12,7 @@ else:
     LibS = "libcsfml-system.so.2.0"
     LibW = "libcsfml-window.so.2.0"
   #{.error: "Platform unsupported".}
-{.deadCodeElim: on.}
+
 {.pragma: pf, pure, final.}
 type
   PClock* = ptr TClock

tests/manyloc/keineschweine/dependencies/sfml/sfml_colors.nim

@@ -1,5 +1,5 @@
 import sfml
-{.deadCodeElim: on.}
+
 let
   Black*: TColor = color(0, 0, 0)
   White*: TColor = color(255, 255, 255)

tests/manyloc/keineschweine/dependencies/sfml/sfml_vector.nim

@@ -1,2 +1 @@
 import sfml, math, strutils
-{.deadCodeElim: on.}

tests/manyloc/keineschweine/keineschweine.nim

@@ -5,7 +5,7 @@ import
   sg_gui, sg_assets, sound_buffer, enet_client
 when defined(profiler):
   import nimprof
-{.deadCodeElim: on.}
+
 type
   PPlayer* = ref TPlayer
   TPlayer* = object

tests/manyloc/keineschweine/lib/sg_gui.nim

@@ -2,7 +2,7 @@ import
   sfml, sfml_colors,
   input_helpers, sg_packets
 from strutils import countlines
-{.deadCodeElim: on.}
+
 type
   PGuiContainer* = ref TGuiContainer
   TGuiContainer* = object of TObject

tests/manyloc/keineschweine/server/nim.cfg

@@ -1,5 +1,4 @@
 debugger = off
-deadCodeElim = on
 path = ".."
 path = "../genpacket"
 path = "../helpers"

tests/manyloc/nake/nakefile.nim

@@ -10,7 +10,7 @@ const
   ExeName = "keineschweine"
   ServerDefines = "-d:NoSFML -d:NoChipmunk"
   TestBuildDefines = "-d:escapeMenuTest -d:debugWeps -d:showFPS -d:moreNim -d:debugKeys -d:foo -d:recordMode --forceBuild"
-  ReleaseDefines = "-d:release --deadCodeElim:on"
+  ReleaseDefines = "-d:release"
   ReleaseTestDefines = "-d:debugWeps -d:debugKeys --forceBuild"
 
 task "testprofile", "..":

tests/manyloc/standalone/barebone.nim.cfg

@@ -1,3 +1,2 @@
 --os:standalone
---deadCodeElim:on
 --gc:none

tests/pragmas/tnoreturn.nim

@@ -9,6 +9,9 @@ proc noret1*(i: int) {.noreturn.} =
 proc noret2*(i: int): void {.noreturn.} =
   echo i
 
+noret1(1)
+noret2(2)
+
 var p {.used.}: proc(i: int): int
 doAssert(not compiles(
   p = proc(i: int): int {.noreturn.} = i # noreturn lambda returns int

tests/rodfiles/deadg.nim

@@ -1,6 +1,3 @@
-
-{.deadCodeElim: on.}
-
 proc p1*(x, y: int): int =
   result = x + y
 

tools/nim.bash-completion

@@ -15,7 +15,7 @@ _nim()
    return 0
  fi
   case $prev in
-    --stackTrace|--lineTrace|--threads|-x|--checks|--objChecks|--fieldChecks|--rangeChecks|--boundChecks|--overflowChecks|-a|--assertions|--floatChecks|--nanChecks|--infChecks|--deadCodeElim)
+    --stackTrace|--lineTrace|--threads|-x|--checks|--objChecks|--fieldChecks|--rangeChecks|--boundChecks|--overflowChecks|-a|--assertions|--floatChecks|--nanChecks|--infChecks)
       # Options that require on/off
       [[ "$cur" == "=" ]] && cur=""
       COMPREPLY=( $(compgen -W 'on off' -- "$cur") )
@@ -32,7 +32,7 @@ _nim()
       return 0
     ;;
     *)
-      kw="-r -p= --path= -d= --define= -u= --undef= -f --forceBuild --opt= --app= --stackTrace= --lineTrace= --threads= -x= --checks= --objChecks= --fieldChecks= --rangeChecks= --boundChecks= --overflowChecks= -a= --assertions= --floatChecks= --nanChecks= --infChecks= --deadCodeElim="
+      kw="-r -p= --path= -d= --define= -u= --undef= -f --forceBuild --opt= --app= --stackTrace= --lineTrace= --threads= -x= --checks= --objChecks= --fieldChecks= --rangeChecks= --boundChecks= --overflowChecks= -a= --assertions= --floatChecks= --nanChecks= --infChecks="
       COMPREPLY=( $( compgen -W "${kw}" -- $cur ) )
       _filedir '@(nim)'
       #$split

tools/nim.zsh-completion

@@ -60,8 +60,6 @@ _nim() {
     '*--infChecks=off[turn Inf checks off]' \
     '*--nilChecks=on[turn nil checks on]' \
     '*--nilChecks=off[turn nil checks off]' \
-    '*--deadCodeElim=on[whole program dead code elimination on]' \
-    '*--deadCodeElim=off[whole program dead code elimination off]' \
     '*--opt=none[do not optimize]' \
     '*--opt=speed[optimize for speed|size - use -d:release for a release build]' \
     '*--opt=size[optimize for size]' \