CODEWITHSUNDEEP
linuxgccunicodelinkericu
jdb2
jdb2

Reputation: 121

Strange problem when trying to link C code against ICU Unicode libraries on Linux

I have been playing around with the ICU Unicode libraries and I recently encountered some strange linking errors that have stumped me.

I've narrowed the code down to a minimal example which demonstrates the linker errors :

#include <unicode/uchar.h>
#include <unicode/ustdio.h>
#include <unicode/utypes.h>
//#include <unicode/coll.h>

int main(void) {
    UFILE *ustdout;
    ustdout = u_get_stdout();
    UChar32 *ustr1 = L"Ich bin glücklich!";
    u_fprintf(ustdout, "%S\n", ustr1);
    return(0);
}

On my Linux Mint 19.2 Cinnamon 64-bit system, compiling the above, according to the icu-config output, gives me :

$ gcc c-icu-test-3.c -I/usr/include -licui18n -licuuc -licudata -o c-icu-test-3.bin
/tmp/ccjku7rS.o: In function `main':
c-icu-test-3.c:(.text+0x9): undefined reference to `u_get_stdout_60'
c-icu-test-3.c:(.text+0x34): undefined reference to `u_fprintf_60'
collect2: error: ld returned 1 exit status

According to "icu-config --cc --cflags --cppflags --ldflags-libsonly" , I'm using the correct command line options.

I have tracked the problem down to something to do with the "U_ICU_ENTRY_POINT_RENAME" macro, and, issuing an "find /usr/include/unicode/ -regextype gnu-awk -regex '(..c$)|(..h$)' -exec grep -H -n -P '^#define +U_ICU_ENTRY_POINT_RENAME.*$' {} \;" outputs :

$ find /usr/include/unicode/ -regextype gnu-awk -regex '(.*\.c$)|(.*\.h$)' -exec grep -H -n -P '^#define +U_ICU_ENTRY_POINT_RENAME.*$' {} \;
/usr/include/unicode/uvernum.h:109:#define U_ICU_ENTRY_POINT_RENAME(x)    U_DEF2_ICU_ENTRY_POINT_RENAME(x,U_ICU_VERSION_SUFFIX,U_LIB_SUFFIX_C_NAME)
/usr/include/unicode/uvernum.h:113:#define U_ICU_ENTRY_POINT_RENAME(x)    U_DEF2_ICU_ENTRY_POINT_RENAME(x,U_ICU_VERSION_SUFFIX)

I have made sure that I have all the necessary header files and libraries. There, though, appears to be some type of version mismatch, but I don't know how to solve it.

Any help would be appreciated.

Thanks,

jdb2

Upvotes: 0

Views: 861

Answers (1)

Safari
Safari

Reputation: 26

You need also flag --ldflags-icuio for icu-config.

Upvotes: 1

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