[PATCH] cblas: compatibility for compilers without C99 complex number support (e.g. Visual Studio)

gistfile1.diff

From 5820e897d2dff52255d6229cb8238e4f9d21ff89 Mon Sep 17 00:00:00 2001
From: Zaheer Chothia <zaheer.chothia@gmail.com>
Date: Sun, 22 Apr 2012 21:16:03 +0200
Subject: [PATCH] cblas: compatibility for compilers without C99 complex
 number support (e.g. Visual Studio)

---
 Makefile.install           |    2 +-
 cblas.h                    |   18 +++++++++---------
 common.h                   |   22 ++++++++++++++++++++++
 openblas_config_template.h |   31 +++++++++++++++++++++++++++++++
 4 files changed, 63 insertions(+), 10 deletions(-)

diff --git a/Makefile.install b/Makefile.install
index 6ecfd91..62ceda9 100644
--- a/Makefile.install
+++ b/Makefile.install
@@ -23,7 +23,7 @@ install : 	lib.grd
 	@cat config_last.h >> $(OPENBLAS_INCLUDE_DIR)/openblas_config.h
 	@echo \#define VERSION \" OpenBLAS $(VERSION) \" >> $(OPENBLAS_INCLUDE_DIR)/openblas_config.h
 	@cat openblas_config_template.h >> $(OPENBLAS_INCLUDE_DIR)/openblas_config.h
-	@echo \#endif >> $(OPENBLAS_INCLUDE_DIR)/openblas_config.h
+	@echo \#endif  \/\* OPENBLAS_CONFIG_H \*\/ >> $(OPENBLAS_INCLUDE_DIR)/openblas_config.h
 
 	@echo Generating f77blas.h in $(OPENBLAS_INCLUDE_DIR)
 	@echo \#ifndef OPENBLAS_F77BLAS_H > $(OPENBLAS_INCLUDE_DIR)/f77blas.h
diff --git a/cblas.h b/cblas.h
index 34adc5e..f3708a9 100644
--- a/cblas.h
+++ b/cblas.h
@@ -22,15 +22,15 @@ double cblas_dsdot (blasint n, float *x, blasint incx, float *y, blasint incy);
 float  cblas_sdot(blasint n, float  *x, blasint incx, float  *y, blasint incy);
 double cblas_ddot(blasint n, double *x, blasint incx, double *y, blasint incy);
 
-float  _Complex cblas_cdotu(blasint n, float  *x, blasint incx, float  *y, blasint incy);
-float  _Complex cblas_cdotc(blasint n, float  *x, blasint incx, float  *y, blasint incy);
-double _Complex cblas_zdotu(blasint n, double *x, blasint incx, double *y, blasint incy);
-double _Complex cblas_zdotc(blasint n, double *x, blasint incx, double *y, blasint incy);
-
-void  cblas_cdotu_sub(blasint n, float  *x, blasint incx, float  *y, blasint incy, float  _Complex *ret);
-void  cblas_cdotc_sub(blasint n, float  *x, blasint incx, float  *y, blasint incy, float  _Complex *ret);
-void  cblas_zdotu_sub(blasint n, double *x, blasint incx, double *y, blasint incy, double _Complex *ret);
-void  cblas_zdotc_sub(blasint n, double *x, blasint incx, double *y, blasint incy, double _Complex *ret);
+openblas_complex_float  cblas_cdotu(blasint n, float  *x, blasint incx, float  *y, blasint incy);
+openblas_complex_float  cblas_cdotc(blasint n, float  *x, blasint incx, float  *y, blasint incy);
+openblas_complex_double cblas_zdotu(blasint n, double *x, blasint incx, double *y, blasint incy);
+openblas_complex_double cblas_zdotc(blasint n, double *x, blasint incx, double *y, blasint incy);
+
+void  cblas_cdotu_sub(blasint n, float  *x, blasint incx, float  *y, blasint incy, openblas_complex_float  *ret);
+void  cblas_cdotc_sub(blasint n, float  *x, blasint incx, float  *y, blasint incy, openblas_complex_float  *ret);
+void  cblas_zdotu_sub(blasint n, double *x, blasint incx, double *y, blasint incy, openblas_complex_double *ret);
+void  cblas_zdotc_sub(blasint n, double *x, blasint incx, double *y, blasint incy, openblas_complex_double *ret);
 
 float  cblas_sasum (blasint n, float  *x, blasint incx);
 double cblas_dasum (blasint n, double *x, blasint incx);
diff --git a/common.h b/common.h
index e848f33..c6d30dd 100644
--- a/common.h
+++ b/common.h
@@ -374,6 +374,28 @@ typedef int blasint;
 #endif
 #endif
 
+#ifndef ASSEMBLER
+#ifndef NOINCLUDE
+/* Inclusion of a standard header file is needed for definition of __STDC_*
+   predefined macros with some compilers (e.g. GCC 4.7 on Linux).  This occurs
+   as a side effect of including either <features.h> or <stdc-predef.h>. */
+#include <stdio.h>
+#endif  // NOINCLUDE
+
+/* C99 supports complex floating numbers natively, which GCC also offers as an
+   extension since version 3.0.  If neither are available, use a compatible
+   structure as fallback (see Clause 6.2.5.13 of the C99 standard). */
+#if defined(__STDC_IEC_559_COMPLEX__) || __STDC_VERSION__ >= 199901L || __GNUC__ >= 3
+  #define OPENBLAS_COMPLEX_C99
+  typedef float _Complex openblas_complex_float;
+  typedef double _Complex openblas_complex_double;
+#else
+  #define OPENBLAS_COMPLEX_STRUCT
+  typedef struct { float real, imag; } openblas_complex_float;
+  typedef struct { double real, imag; } openblas_complex_double;
+#endif
+#endif  // ASSEMBLER
+
 #ifndef IFLUSH
 #define IFLUSH
 #endif
diff --git a/openblas_config_template.h b/openblas_config_template.h
index 8bf9725..caeccf0 100644
--- a/openblas_config_template.h
+++ b/openblas_config_template.h
@@ -39,3 +39,34 @@ typedef int blasint;
 #define FLOATRET	float
 #endif
 #endif
+
+/* Inclusion of a standard header file is needed for definition of __STDC_*
+   predefined macros with some compilers (e.g. GCC 4.7 on Linux).  This occurs
+   as a side effect of including either <features.h> or <stdc-predef.h>. */
+#include <stdio.h>
+
+/* C99 supports complex floating numbers natively, which GCC also offers as an
+   extension since version 3.0.  If neither are available, use a compatible
+   structure as fallback (see Clause 6.2.5.13 of the C99 standard). */
+#if defined(__STDC_IEC_559_COMPLEX__) || __STDC_VERSION__ >= 199901L || __GNUC__ >= 3
+  #define OPENBLAS_COMPLEX_C99
+  #include <complex.h>
+  typedef float _Complex openblas_complex_float;
+  typedef double _Complex openblas_complex_double;
+  #define openblas_make_complex_float(real, imag)   ((real) + ((imag) * _Complex_I))
+  #define openblas_make_complex_double(real, imag)  ((real) + ((imag) * _Complex_I))
+  #define openblas_complex_float_real(z)            (creal(z))
+  #define openblas_complex_float_imag(z)            (cimag(z))
+  #define openblas_complex_double_real(z)           (creal(z))
+  #define openblas_complex_double_imag(z)           (cimag(z))
+#else
+  #define OPENBLAS_COMPLEX_STRUCT
+  typedef struct { float real, imag; } openblas_complex_float;
+  typedef struct { double real, imag; } openblas_complex_double;
+  #define openblas_make_complex_float(real, imag)   {(real), (imag)}
+  #define openblas_make_complex_double(real, imag)  {(real), (imag)}
+  #define openblas_complex_float_real(z)            ((z).real)
+  #define openblas_complex_float_imag(z)            ((z).imag)
+  #define openblas_complex_double_real(z)           ((z).real)
+  #define openblas_complex_double_imag(z)           ((z).imag)
+#endif
-- 
1.7.10.msysgit.1