We are developing an application for iphone 4 in xcode4 where we get an error when compiling for the device:

{standard input}: unknown: Undefined local symbol LC85
{standard input}: unknown: Undefined local symbol LC86
Command / Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

We are using the gcc 4.2 and Eigen packages such as SVD, Array, QR, LU, Core, Cholesky, etc.
However when compiling for the iPhone Simulator 4 gives no error.

As could be solved?

this seems to be the same issue as here:
viewtopic.php?f=74&t=94774

and it seems this has never been really fixed. In the meantime you could #define EIGEN_DONT_VECTORIZE

Also, which version of Eigen are you using?

could you try the following patch to see if that does the trick? (I cannot test myself)

Code: Select all

diff -r 83521c523b99 Eigen/src/Core/arch/NEON/Complex.h
--- a/Eigen/src/Core/arch/NEON/Complex.h   Thu Aug 25 07:42:32 2011 +0100
+++ b/Eigen/src/Core/arch/NEON/Complex.h   Sat Sep 03 03:26:07 2011 +0200
@@ -27,8 +27,6 @@
 
 namespace internal {
 
-static uint32x4_t p4ui_CONJ_XOR = { 0x00000000, 0x80000000, 0x00000000, 0x80000000 };
-static uint32x2_t p2ui_CONJ_XOR = { 0x00000000, 0x80000000 };
 
 //---------- float ----------
 struct Packet2cf
@@ -74,12 +72,14 @@
 template<> EIGEN_STRONG_INLINE Packet2cf pnegate(const Packet2cf& a) { return Packet2cf(pnegate<Packet4f>(a.v)); }
 template<> EIGEN_STRONG_INLINE Packet2cf pconj(const Packet2cf& a)
 {
+  const uint32x4_t p4ui_CONJ_XOR = { 0x00000000, 0x80000000, 0x00000000, 0x80000000 };
   Packet4ui b = vreinterpretq_u32_f32(a.v);
   return Packet2cf(vreinterpretq_f32_u32(veorq_u32(b, p4ui_CONJ_XOR)));
 }
 
 template<> EIGEN_STRONG_INLINE Packet2cf pmul<Packet2cf>(const Packet2cf& a, const Packet2cf& b)
 {
+  const uint32x4_t p4ui_CONJ_XOR = { 0x00000000, 0x80000000, 0x00000000, 0x80000000 };
   Packet4f v1, v2;
   float32x2_t a_lo, a_hi;
 
@@ -179,6 +179,7 @@
 
 template<> EIGEN_STRONG_INLINE std::complex<float> predux_mul<Packet2cf>(const Packet2cf& a)
 {
+  const uint32x2_t p2ui_CONJ_XOR = { 0x00000000, 0x80000000 };
   float32x2_t a1, a2, v1, v2, prod;
   std::complex<float> s;
 



ggael's patch code works only when I include Eigen/Core and use basic arithmatic functions.
Though, it also makes a compile error when I use SVD function such as 'jacobiSvd' in Eigen/SVD.
Anyone has solved this problem?

@ I am using the latest Eigen (ver 3.0.3) and iOS 4.3.4 with iPhone 3GS and Xcode 4.1

One thing I can suggest from personal experience -- try getting a somewhat decent version of a compiler. GCC 4.2 is pre-historic by now, and I know that the fruit company isn't too keen on updates, but I had my fair share of trouble with a product I do for Mac OS and most, if not all, of them went away by getting a newer compiler.