compila codice a 32 bit da cygwin64

Question

Ho installato Cygwin64 su un win7-64 con gli strumenti gcc dev e ho notato che produce binari a 64 bit. (Beh, non è così sorprendente: o) C'è un mezzo per far sì che produca dei binari a 32 bit?

Sto compilando lo strumento socat per Windows, compilato a 64 bit funziona, ma sto cercando di rendere un'altra versione adatta per un XP-32.

Lo script configure non sembra sostenere un interruttore -b 32 (che devo aver visto per ming64 da this thread, e se provo a specificare l'opzione -m32 in CFLAGS per configure fallisce:

$ CFLAGS=-m32 ./configure 
checking which defines needed for makedepend... 
checking for a BSD-compatible install... /usr/bin/install -c 
checking for gcc... gcc 
checking whether the C compiler works... no 
configure: error: in `/cygdrive/c/dev/tools/nettools/socat/socat-2.0.0-b8': 
configure: error: C compiler cannot create executables 
See `config.log' for more details 

Would l'opzione quella di installare anche cygwin32, o posso compilare il codice a 32 bit con un'altra impostazione o pacchetto cygwin ulteriore

Modifica:? ho foun d che il mio cygwin64/gcc non può compilare un semplice programma hello.c a 32bit:

#include <stdio.h> 

int main (int argc, char *argv[]){ 
    printf("Hello, world!\n"); 
    return 0; 
} 

con una gcc -o hello.exe hello.c funziona perfettamente, ma gcc -o hello.exe hello.c -m32 sputa

/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../libcygwin.a when searching for -lcygwin 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../libcygwin.a when searching for -lcygwin 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../libcygwin.a when searching for -lcygwin 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lcygwin 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -ladvapi32 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lshell32 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -luser32 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lkernel32 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc_s.dll.a when searching for -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lgcc_s 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2//libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-cygwin/4.9.2/libgcc.a when searching for -lgcc 
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lgcc 
collect2: error: ld returned 1 exit status 

Answer 1

Cygwin fornisce pacchetti contenenti toolchain incrociati Cygwin-to-cygwin . Esistono pacchetti cygwin32-* per la creazione di pacchetti da 32 bit Cygwin a 64 bit e cygwin64-* per la creazione di 64 bit da Cygwin a 32 bit.

Non li ho mai usato, ma suppongo che lavorano più o meno come qualsiasi toolchain croce, così si dovrebbe passare corrette --host e --build argomenti per il vostro ./configure passo.

Answer 2

L'aggiunta di -m32 al compilatore non consente di selezionare le librerie corrette. È necessario verificare di aver installato il compilatore i686-pc-cygwin-gcc. Per utilizzare il compilatore che si deve fare qualcosa di simile:

./configure --target = i686-pc-Cygwin

Speranza che aiuta :-)