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digitalmars.D.ldc - dmd verus ldmd2 -lib option

reply Dan Olson <zans.is.for.cans yahoo.com> writes:
I noticed that dmd -lib breaks up a module into separate .o's when
building a static library.  This is could help make smaller executables
(I am thinking smart phones) when linking with phobos because it will
only pull in to .o's needed to satisfy what is referenced.

ldmd2 -lib doesn't split into multiple .o's like dmd.  Does it seem like
a good idea to do the same (I am thinking so).

Example: file testlib.d gets split into four .o's
cat >testlib.d <<eof
void foo() {}
void bar() {}
void xyzzy() {}
eof
$ dmd -lib -oflibtest.a testlib.d
$ nm libtest.a

libtest.a(testlib.o):
0000000000000050 D _D7testlib12__ModuleInfoZ
0000000000000030 T _D7testlib15__unittest_failFiZv
0000000000000000 T _D7testlib7__arrayZ
0000000000000018 T _D7testlib8__assertFiZv
                 U __d_array_bounds
                 U __d_assertm
                 U __d_unittestm

libtest.a(testlib_1_144.o):
0000000000000000 S _D7testlib3fooFZv

libtest.a(testlib_2_135.o):
0000000000000000 S _D7testlib3barFZv

libtest.a(testlib_3_25e.o):
0000000000000000 S _D7testlib5xyzzyFZv
Feb 01 2014
parent reply "Kai Nacke" <kai redstar.de> writes:
On Saturday, 1 February 2014 at 23:51:06 UTC, Dan Olson wrote:

 I noticed that dmd -lib breaks up a module into separate .o's 
 when
 building a static library.  This is could help make smaller 
 executables
 (I am thinking smart phones) when linking with phobos because 
 it will
 only pull in to .o's needed to satisfy what is referenced.

 ldmd2 -lib doesn't split into multiple .o's like dmd.  Does it 
 seem like
 a good idea to do the same (I am thinking so).

 Example: file testlib.d gets split into four .o's
 cat >testlib.d <<eof
 void foo() {}
 void bar() {}
 void xyzzy() {}
 eof
 $ dmd -lib -oflibtest.a testlib.d
 $ nm libtest.a

 libtest.a(testlib.o):
 0000000000000050 D _D7testlib12__ModuleInfoZ
 0000000000000030 T _D7testlib15__unittest_failFiZv
 0000000000000000 T _D7testlib7__arrayZ
 0000000000000018 T _D7testlib8__assertFiZv
                  U __d_array_bounds
                  U __d_assertm
                  U __d_unittestm

 libtest.a(testlib_1_144.o):
 0000000000000000 S _D7testlib3fooFZv

 libtest.a(testlib_2_135.o):
 0000000000000000 S _D7testlib3barFZv

 libtest.a(testlib_3_25e.o):
 0000000000000000 S _D7testlib5xyzzyFZv


Hi Dan,

that's a in ldmd2. Could you please create an issue?
https://github.com/ldc-developers/ldc/issues?state=open

Thanks!!!

Regards,
Kai
Feb 03 2014
parent Dan Olson <zans.is.for.cans yahoo.com> writes:
https://github.com/ldc-developers/ldc/issues/579
Feb 04 2014