site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com User-agent: Microsoft-Entourage/10.1.6.040913.0 I'm trying to port an LD_PRELOAD trick from Linux to MacOS X. Given the following two files: foo.c: ------ #include <stdio.h> int my_var = 64; void __attribute__((constructor)) my_init() { printf("Constructor called!\n"); } bar.c: ------ int main() { return 0; } Things work as expected on RedHat Linux Fedora Core 2: gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5) ------------------------------------------------------ % gcc -o bar bar.c % gcc -o foo.so -fPIC -shared foo.c % LD_PRELOAD="./foo.so" ./bar Constructor called! % But on MacOS X 10.3.8, unhappiness: gcc version 3.3 20030304 (Apple Computer, Inc. build 1671) (This is the latest and greatest of Apple's gcc, AFAIK) ---------------------------------------------------------- % gcc -dynamiclib -fno-common -o foo.dylib foo.c % gcc -o bar bar.c % DYLD_INSERT_LIBRARIES="foo.dylib" ./bar % % DYLD_INSERT_LIBRARIES="foo.dylib" DYLD_PRINT_LIBRARIES=1 ./bar loading libraries for DYLD_INSERT_LIBRARIES=foo.dylib loading library: foo.dylib loading libraries for image: ./bar loading library: foo.dylib loading library: /usr/lib/libSystem.B.dylib loading libraries for image: foo.dylib loading libraries for image: /usr/lib/libSystem.B.dylib loading library: /usr/lib/system/libmathCommon.A.dylib loading libraries for image: /usr/lib/system/libmathCommon.A.dylib % As you can see, foo.dylib is, in fact, loaded. If I change the code such that bar.c references some symbol in foo.c, and link bar directly with the library, it works as expected. If anyone reading this has a Tiger seed, would you mind seeing if this is still broken? Does anyone know of a workaround in Panther? I can edit foo.c to my heart's content, but bar.c is not available to me. I've been thinking about overriding some common symbol I hope will never actually be used (although I don't know what that might be) as a potential hack. Thanks, Brian _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com