[Scons-users] Implicit dependency file search

[Nathan Paul Simons]

Thank you very much for that! That solves part of my problem; however,
SCons was still not finding system include headers. Digging a bit (this is
very preliminary - only tested against g++ 4.7.3 on Cygwin), I found in
SCons/Tool/g++.py a place to add some logic to ask GCC for its include
paths:

--- engine/SCons/Tool/g++.py	2013-03-03 06:48:40.000000000 -0800
+++ /usr/local/stow/scons-2.3.0/lib/scons-2.3.0/SCons/Tool/g++.py	2013-09-11 12:44:54.125418900 -0700
@@ -51,6 +51,7 @@
     cplusplus.generate(env)
 
     env['CXX']        = env.Detect(compilers)
+    env.AppendUnique(CPPPATH = get_internal_cpppath(env))
 
     # platform specific settings
     if env['PLATFORM'] == 'aix':
@@ -83,6 +84,36 @@
 def exists(env):
     return env.Detect(compilers)
 
+def get_internal_cpppath(env):
+    print "Get internal cpppath"
+    result = []
+
+    # Get the preprocessor that g++ is using.
+    pipe = SCons.Action._subproc(env, [env['CXX'], '-print-prog-name=cc1plus'],
+                                 stdin = 'devnull',
+                                 stderr = 'devnull',
+                                 stdout = subprocess.PIPE)
+    if pipe.wait() != 0: return result
+    cppcmd = pipe.stdout.readline().strip()
+
+    pipe = SCons.Action._subproc(env, [cppcmd, '-v'],
+                                 stdin = 'devnull',
+                                 stderr = subprocess.PIPE,
+                                 stdout = 'devnull')
+    if pipe.wait() != 0: return result
+    line = pipe.stderr.readline()
+    while line:
+        if line.find("#include <...> search starts here:") > -1:
+            line = pipe.stderr.readline().strip()
+            while line:
+                if line.find("End of search list.") > -1:
+                    return result
+
+                result.append(line)
+                line = pipe.stderr.readline().strip()
+
+        line = pipe.stderr.readline().strip()
+
 # Local Variables:
 # tab-width:4
 # indent-tabs-mode:nil

On Mon, Aug 05, 2013 at 10:44:25PM +0200, Julien Pommier wrote:

> It sounds like you are running into this issue:

> 

> http://scons.tigris.org/issues/show_bug.cgi?id=2723

> 

> 

> On 5 août 2013, at 21:55, Nathan Paul Simons <MgA5Ge0b-scons at hardcorehackers.com> wrote:

> 

> > On Wed, Jul 31, 2013 at 01:09:33AM +0200, Dirk Bächle wrote:

> >> On 31.07.2013 00:36, Nathan Paul Simons wrote:

> >>> I corrected those errors, and still have the same result; surprisingly,

> >>> I can only seem to reproduce the error under Cygwin. I'm still testing

> >>> things out, so I'll have to get back to you. Thanks!

> >> 

> >> when you mention "Cygwin" this rings a bell in my head. Don't we

> >> always have trouble with native Python vs. the Cygwin version, or

> >> somethin'?

> >> Can you please give us some more details about how exactly your

> >> environment looks like?

> >> Which versions of Python and Cygwin are you using? OS is Windows, I suppose?

> > 

> > Sorry for the late response; yes, it's under windows, with the Python

> > that comes with Cygwin (Python 2.7.3). I'm currently trying SCons 2.3.0,

> > but I've been having this problem for a while (since at least 2.2.0).

> > I've also tried on a Debian Linux box with Python 2.7.3 and SCons 2.3.0

> > and it seems to work there. Output of scons --tree=prune under Cygwin:

> > 

> > scons: Reading SConscript files ...

> > scons: done reading SConscript files.

> > scons: Building targets ...

> > gcc -o subdir/hello.o -c -Isubdir subdir/hello.c

> > gcc -o subdir/hello.exe subdir/hello.o

> > +-.

> >  +-SConstruct

> >  +-subdir

> >    +-subdir/hello.c

> >    +-subdir/hello.exe

> >    | +-subdir/hello.o

> >    | | +-subdir/hello.c

> >    | | +-/bin/gcc

> >    | +-/bin/gcc

> >    +-[subdir/hello.o]

> >    +-subdir/SConstruct

> > scons: done building targets.

> > 

> > Same thing under same versions in Debian:

> > 

> > scons: Reading SConscript files ...

> > scons: done reading SConscript files.

> > scons: Building targets ...

> > gcc -o subdir/hello.o -c -Isubdir subdir/hello.c

> > gcc -o subdir/hello subdir/hello.o

> > +-.

> >  +-SConstruct

> >  +-subdir

> >    +-subdir/SConstruct

> >    +-subdir/hello

> >    | +-subdir/hello.o

> >    | | +-subdir/hello.c

> >    | | +-subdir/hello.h

> >    | | +-/usr/bin/gcc

> >    | +-/usr/bin/gcc

> >    +-subdir/hello.c

> >    +-subdir/hello.h

> >    +-[subdir/hello.o]

> > scons: done building targets.

> > 

> > Perhaps it's an FS ordering or lookup problem? Had something similar a

> > while back on my current project when listing directory contents using

> > C's opendir() (with a compat header for dirent.h under Windows).

> > 

> > -- 

> > Sent from my Universal Turing Machine

> > _______________________________________________

> > Scons-users mailing list

> > Scons-users at scons.org

> > http://four.pairlist.net/mailman/listinfo/scons-users

> 

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-- 
Sent from my Universal Turing Machine