Package: tesseract
Version: 1.02-3
Tags: patch
Your package fails to build with recent versions of the gcc-snapshot
package, i.e. a pre-release of GCC 4.2. The problem is that external
variables are defined both in a C and C++ context, as you can see in
this simple example:
42059:[EMAIL PROTECTED]: ~] /usr/lib/gcc-snapshot/bin/g++ -c t.cc
t.cc:1: error: previous declaration of 'int i' with 'C++' linkage
t.cc:4: error: conflicts with new declaration with 'C' linkage
42060:[EMAIL PROTECTED]: ~] cat t.cc
extern int i;
extern "C" {
extern int i;
}
According to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27227#c8 this
is not valid.
A patch is below, although it's possible you could solve this in a
nicer way. I didn't spend much time on it.
> Automatic build of tesseract_1.02-3 on em64t by sbuild/amd64 0.52
...
> x86_64-linux-gnu-g++ -DHAVE_CONFIG_H -I. -I. -I.. -I../ccstruct
> -I../ccutil -I../cutil -I../classify -I../image -I../dict -I../viewer -Wall
> -DTESSDATA_PREFIX=/usr/share/tesseract-ocr/ -DNDEBUG -O2 -Wall -c -o tface.o
> `test -f 'tface.cpp' || echo './'`tface.cpp
> In file included from /usr/include/unistd.h:783,
> from tface.cpp:47:
> ../cutil/globals.h:46: error: previous declaration of 'int optind' with 'C++'
> linkage
> ../ccutil/getopt.h:23: error: conflicts with new declaration with 'C' linkage
> ../cutil/globals.h:47: error: previous declaration of 'char* optarg' with
> 'C++' linkage
> ../ccutil/getopt.h:24: error: conflicts with new declaration with 'C' linkage
> make[4]: *** [tface.o] Error 1
> make[4]: Leaving directory `/build/tbm/tesseract-1.02/wordrec'
--- ./cutil/tordvars.h~ 2007-02-04 16:18:12.000000000 +0000
+++ ./cutil/tordvars.h 2007-02-04 16:19:07.000000000 +0000
@@ -39,6 +39,8 @@
extern FILE *correct_fp; //correct text
extern FILE *matcher_fp;
+extern "C"
+{
extern int blob_skip; /* Skip to next selection */
extern int num_word_choices; /* How many words to keep */
extern int similarity_enable; /* Switch for Similarity */
@@ -49,6 +51,7 @@
extern int show_bold; /* Use bold text */
extern int display_text; /* Show word text */
extern int display_blocks; /* Show word as boxes */
+}
extern float overlap_threshold; /* Overlap Threshold */
extern float certainty_threshold;/* When to quit looking */
--- ./cutil/globals.h~ 2007-02-04 16:17:07.000000000 +0000
+++ ./cutil/globals.h 2007-02-04 16:17:54.000000000 +0000
@@ -43,9 +43,15 @@
extern int debugs[MAXPROC]; /*debug flags */
extern int plots[MAXPROC]; /*plot flags */
extern int corners[4]; /*corners of scan window */
+#ifdef __cplusplus
+extern "C" {
+#endif
extern int optind; /*option index */
extern char *optarg; /*option argument */
/*image file name */
+#ifdef __cplusplus
+}
+#endif
extern char imagefile[FILENAMESIZE];
/* main directory */
extern char directory[FILENAMESIZE];
--
Martin Michlmayr
http://www.cyrius.com/
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