[pkg-d-commits] [ldc] 162/211: Implement the betterC switch like DMD does.

[Matthias Klumpp]

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mak pushed a commit to annotated tag v1.1.0
in repository ldc.

commit 62a22520282a7f45980a1b959f1958771cdc062d
Author: LemonBoy <thatlemon at gmail.com>
Date:   Wed Nov 9 19:01:08 2016 +0100

    Implement the betterC switch like DMD does.
    
    Namely, don't emit the ModuleInfo.
---
 driver/cl_options.cpp   |  5 +++++
 driver/ldmd.cpp         |  1 +
 gen/modules.cpp         |  4 ++--
 tests/linking/betterc.d | 15 +++++++++++++++
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/driver/cl_options.cpp b/driver/cl_options.cpp
index 03aea41..9c80402 100644
--- a/driver/cl_options.cpp
+++ b/driver/cl_options.cpp
@@ -438,6 +438,11 @@ cl::opt<bool, true>
              cl::desc("implement http://wiki.dlang.org/DIP25 (experimental)"),
              cl::location(global.params.useDIP25));
 
+cl::opt<bool, true> betterC(
+    "betterC",
+    cl::desc("omit generating some runtime information and helper functions"),
+    cl::location(global.params.betterC));
+
 cl::opt<unsigned char, true, CoverageParser> coverageAnalysis(
     "cov", cl::desc("Compile-in code coverage analysis\n(use -cov=n for n% "
                     "minimum required coverage)"),
diff --git a/driver/ldmd.cpp b/driver/ldmd.cpp
index 66e9ed4..6e99c63 100644
--- a/driver/ldmd.cpp
+++ b/driver/ldmd.cpp
@@ -153,6 +153,7 @@ Usage:\n\
   files.d        D source files\n\
   @cmdfile       read arguments from cmdfile\n\
   -allinst       generate code for all template instantiations\n\
+  -betterC       omit generating some runtime information and helper functions\n\
   -c             do not link\n\
   -color[=on|off]   force colored console output on or off\n\
   -conf=path     use config file at path\n\
diff --git a/gen/modules.cpp b/gen/modules.cpp
index a4eb36d..c38482e 100644
--- a/gen/modules.cpp
+++ b/gen/modules.cpp
@@ -722,8 +722,8 @@ void codegenModule(IRState *irs, Module *m) {
   }
 
   // Skip emission of all the additional module metadata if requested by the
-  // user.
-  if (!m->noModuleInfo) {
+  // user or the betterC switch is on.
+  if (!global.params.betterC && !m->noModuleInfo) {
     // generate ModuleInfo
     registerModuleInfo(m);
   }
diff --git a/tests/linking/betterc.d b/tests/linking/betterc.d
new file mode 100644
index 0000000..a704718
--- /dev/null
+++ b/tests/linking/betterc.d
@@ -0,0 +1,15 @@
+// RUN: %ldc -betterC -c -output-ll -of=%t.ll %s && FileCheck %s < %t.ll
+// RUN: %ldc -betterC -defaultlib= -run %s
+
+// CHECK-NOT: ModuleInfoZ
+// CHECK-NOT: ModuleRefZ
+// CHECK-NOT: call void @ldc.register_dso
+version (CRuntime_Microsoft) {
+    extern(C) int mainCRTStartup() {
+        return 0;
+    }
+}
+
+extern (C) int main() {
+    return 0;
+}

-- 
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