diff options
Diffstat (limited to 'Configurations/README')
| -rw-r--r-- | Configurations/README | 46 |
1 files changed, 34 insertions, 12 deletions
diff --git a/Configurations/README b/Configurations/README index ecf2b7908b..fb94aa723e 100644 --- a/Configurations/README +++ b/Configurations/README @@ -39,25 +39,22 @@ In each table entry, the following keys are significant: compiling for shared libraries, typically something like "-fPIC". - ld => the linker command, usually not defined + (linking is a complex thing, see [3] below) + ld => Linker command, usually not defined (meaning the compiler command is used instead). (NOTE: this is here for future use, it's not implemented yet) - lflags => the flags that are used at all times when - linking. These can have a % sign in them - showing where the OpenSSL libraries should - appear, otherwise these flags will come - last. So in a typical links situation, - this is a quick table of results: - - "-foo%-bar" > -foo -lssl -lcrypto -bar - "-foo%" > -foo -lssl -lcrypto - "-foo" > -lssl -lcrypto -foo + lflags => Flags that are used when linking apps. + shared_ldflag => Flags that are used when linking shared + or dynamic libraries. + plib_lflags => Extra linking flags to appear just before + the libraries on the command line. + ex_libs => Extra libraries that are needed when + linking. debug_lflags => Like debug_cflags, but used when linking. release_lflags => Like release_cflags, but used when linking. - shared_lflags => Like shared_cflags, but used when linking. ar => The library archive command, the default is "ar". @@ -253,6 +250,31 @@ In each table entry, the following keys are significant: be "(unknown)", in which case the user MUST give some compilation flags to Configure. +[3] OpenSSL has three types of things to link from object files or + static libraries: + + - shared libraries; that would be libcrypto and libssl. + - shared objects (sometimes called dynamic libraries); that would + be the engines. + - applications; those are apps/openssl and all the test apps. + + Very roughly speaking, linking is done like this (words in braces + represent the configuration settings documented at the beginning + of this file): + + shared libraries: + {ld} $(CFLAGS) {shared_ldflag} -shared -o libfoo.so \ + -Wl,--whole-archive libfoo.a -Wl,--no-whole-archive \ + {plib_lflags} -lcrypto {ex_libs} + + shared objects: + {ld} $(CFLAGS) {shared_ldflag} -shared -o libeng.so \ + blah1.o blah2.o {plib_lflags} -lcrypto {ex_libs} + + applications: + {ld} $(CFLAGS) {lflags} -o app \ + app1.o utils.o {plib_lflags} -lssl -lcrypto {ex_libs} + Historically, the target configurations came in form of a string with values separated by colons. This use is deprecated. The string form |