I am running ubuntu, and I can build ICU
I have included:
#include <unistr.h>
using namespace icu;
This is my build method for ICU:
CPPFLAGS="-DU_USING_ICU_NAMESPACE=0"
CPPFLAGS="-DU_CHARSET_IS_UTF8=1"
export CFLAGS="-DU_CHARSET_IS_UTF8=1 -DU_GNUC_UTF16_STRING=1 -DU_STATIC_IMPLEMENTATION"
export CXXFLAGS="-DU_USING_ICU_NAMESPACE=0 -std=gnu++0x -DU_CHARSET_IS_UTF8=1 -DU_GNUC_UTF16_STRING=1 -DU_HAVE_CHAR16_T=1 -DUCHAR_TYPE=char16_t -Wall --std=c++0x -DU_STATIC_IMPLEMENTATION"
export CPPFLAGS="-DU_USING_ICU_NAMESPACE=0 -DU_CHARSET_IS_UTF8=1 -DU_STATIC_IMPLEMENTATION"
export LDFLAGS="-std=gnu++0x"
./runConfigureICU Linux --enable-static --disable-shared --disable-renaming
make check
sudo make install
I then link to
/usr/local/lib/libicuuc.a
and try to compile
icu::UnicodeString s1=UNICODE_STRING("such characters are safe 123 %-.", 32);
but get the error
undefined reference to `icu_56::UnicodeString::UnicodeString(signed char, unsigned short const*, int)'
I found another post here on SO regarding the same problem, but when I follow the steps provided it does not fix my problem and may be a different version.
EDIT: This is the output from the IDE upon building the project
Cleaning Solution: myProject (Debug)
Cleaning: myProject (Debug)
Removing output files...
Clean complete
Building Solution: myProject (Debug)
Building: myProject (Debug)
Performing main compilation...
Precompiling headers
Compiling source to object files
g++ -MMD "/home/user/myProject/myProject/main.cpp" -g -O0 -std=c++11 -DDEBUG -I"/home/user/myProject/myProject/include" -I"/home/user/myProject/icu/unicode" -I"/home/user/myProject/myProject/.prec/Debug" -c -o "/home/user/myProject/myProject/bin/Debug/main.o"
Generating binary "myProject" from object files
g++ -o "/home/user/myProject/myProject/bin/Debug/myProject" "/home/user/myProject/myProject/bin/Debug/main.o"
"/home/user/myProject/icu/libicuuc.a"
/home/user/myProject/myProject/bin/Debug/main.o: In function `icuTest':
/home/user/myProject/myProject/icuTest.hpp:3: undefined reference to `icu_56::StringPiece::StringPiece(char const*)'
/home/user/myProject/myProject/icuTest.hpp:3: undefined reference to `icu_56::UnicodeString::fromUTF8(icu_56::StringPiece const&)'
/home/user/myProject/myProject/icuTest.hpp:3: undefined reference to `icu_56::UnicodeString::~UnicodeString()'
/home/user/myProject/myProject/icuTest.hpp:3: undefined reference to `icu_56::UnicodeString::~UnicodeString()'
collect2: error: ld returned 1 exit status
Build complete -- 4 errors, 0 warnings
---------------------- Done ----------------------
Build: 4 errors, 0 warnings
When you ran:
./runConfigureICU Linux --enable-static --disable-shared --disable-renaming
did you heed the warning?:
*** WARNING: You must set the following flags before code compiled against this ICU will function properly:
-DU_DISABLE_RENAMING=1
The recommended way to do this is to prepend the following lines to source/common/unicode/uconfig.h or #include them near the top of that file.
/* -DU_DISABLE_RENAMING=1 */
#define U_DISABLE_RENAMING 1
If not, then do so now.
Next, modify your test program to #include <unicode/uconfig.h>
before anything else,
e.g.
main.cpp
#include <unicode/uconfig.h>
#include <unicode/platform.h>
#include <unicode/unistr.h>
int main()
{
icu::UnicodeString s1=UNICODE_STRING("such characters are safe 123 %-.", 32);
(void)s1;
return 0;
}
The it will compile and link against libicuuc.a
.
You can if you wish ensure that boilerplate headers like unicode/uconfig.h
and unicode/platform.h
are automatically included by the the compiler before
anything else by making use of a pre-include header, e.g.
icu_preinc.h
// pre-include header for icu
#include <unicode/uconfig.h>
#include <unicode/platform.h>
which you pass to GCC or clang with the option:
-include /path/to/icu_preinc.h
You can put this option in your CPPFLAGS
if you use a make
-based build system.
In the case of the toy program above it is enough just to define U_DISABLE_RENAMING=1
on the commandline, without including <unicode/uconfig.h>
g++ -DU_DISABLE_RENAMING=1 -o prog main.cpp -L/your/libicuuc/search/path -licuuc
I notice that your g++ line is not pointing to /usr/local/lib/libicuuc.a where you say you installed icu. It obviously is compiling against the headers OK, but does the static library exist in the path you are using ("/home/user/myProject/icu/libicuuc.a")?
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