'cflags' parameter is broken in gyp on OS X?

README.md

This is a barebones GYP file to compile 1 C source file. We are demonstrating that the cflags parameter in gyp files gets completely ignored :(

$ ../gyp/gyp -f make --depth=. hello.gyp
$ V=1 make
  cc   -fasm-blocks -mpascal-strings -Os -gdwarf-2  -MMD -MF out/Default/.deps/out/Default/obj.target/hello/hello.o.d.raw  -c -o out/Default/obj.target/hello/hello.o hello.c
  ./gyp-mac-tool flock out/Default/linker.lock g++ -Lout/Default   -o "out/Default/hello" out/Default/obj.target/hello/hello.o 
  LINK(target) out/Default/hello: Finished

We would expect a -ObjC flag to be present somewhere in the cc command, but it's not...

hello.c

#include <stdio.h>

int main () {
  printf("Hello\n");
  return 0;
}

hello.gyp

{
  'targets': [
    {
      'target_name': 'hello',
      'type': 'executable',
      'cflags': [
          '-ObjC'
      ],
      'sources': [
          'hello.c'
      ]
    }
  ]
}

I think it's that gyp better at building xcode/visual studio projects and perhaps not well tested with the make generator. I think this should work for you if you are on osx:

Index: pylib/gyp/generator/make.py
===================================================================
--- pylib/gyp/generator/make.py (revision 1137)
+++ pylib/gyp/generator/make.py (working copy)
@@ -1152,15 +1152,15 @@
           quoter=EscapeCppDefine)

       if self.flavor == 'mac':
-        cflags = self.xcode_settings.GetCflags(configname)
-        cflags_c = self.xcode_settings.GetCflagsC(configname)
-        cflags_cc = self.xcode_settings.GetCflagsCC(configname)
+        #cflags = self.xcode_settings.GetCflags(configname)
+        #cflags_c = self.xcode_settings.GetCflagsC(configname)
+        #cflags_cc = self.xcode_settings.GetCflagsCC(configname)
         cflags_objc = self.xcode_settings.GetCflagsObjC(configname)
         cflags_objcc = self.xcode_settings.GetCflagsObjCC(configname)
-      else:
-        cflags = config.get('cflags')
-        cflags_c = config.get('cflags_c')
-        cflags_cc = config.get('cflags_cc')
+      #else:
+      cflags = config.get('cflags')
+      cflags_c = config.get('cflags_c')
+      cflags_cc = config.get('cflags_cc')

       self.WriteLn("# Flags passed to all source files.");
       self.WriteList(cflags, 'CFLAGS_%s' % configname)

cflags only seems to be supported for Scons.

This works both with make and xcode generators on Mac:

{
  'targets': [
    {
      'target_name': 'hello',
      'type': 'executable',
      'xcode_settings': {
        'OTHER_CFLAGS': [
          '-ObjC'
        ],
      },
      'sources': [
          'hello.c'
      ]
    }
  ]
}

Thanks @paddybyers. Indeed it seems that adding an xcode_settings block is the preferred way of doing this.

Thanks, @google. I found this gist and fixed my problem: indutny/candor@40a27c8#diff-0

This issues is still present. @paddybyers approach still works.

Any solution of how to make cflags work on Windows?

Still no solution to make it work on Windows ?

This seems to work in linux now with node-gyp v3.6.2 (e.g. gyp pays attention to the cflags field)

How to make this brilliant utilty pass flag on linux?