don't get echoserver static #849

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1. embhorn

   self-assigned this

   on Nov 13, 2025
2. embhorn commented on Nov 13, 2025

   

   embhorn

   on Nov 13, 2025

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   Hello @divinity76

   Thanks for contacting wolfSSL Support. Could you tell us a bit about your project?

   The example does use external libs. The math lib dependency can be removed by configuring wolfSSL:

   #if 1
       /* Use table for DH instead of -lm (math) lib dependency */
       #if 1
           #define WOLFSSL_DH_CONST
           #define HAVE_FFDHE_2048
           //#define HAVE_FFDHE_4096
           //#define HAVE_FFDHE_6144
           //#define HAVE_FFDHE_8192
       #endif
   #else
       #define NO_DH
   #endif
   

   The C lib and other dependencies will require you to build those libs as static and modify the make file to use those static libs. This would be more common in an embedded library context. You are building the defaults in linux, so the shared libs are being pulled in.

   Let us know if you have further questions.

   Thanks,
   @embhorn
3. divinity76 commented on Nov 18, 2025

   

   divinity76

   on Nov 18, 2025

   Last edited by divinity76

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   got it static by bypassing the makefile with

   $ gcc -static -s -Os -DHAVE_CONFIG_H -I. -Iinstall/include -Iwolfssl/install/include examples/echoserver/echoserver.c install/lib/libwolfssh.a wolfssl/install/lib/libwolfssl.a -lm -o examples/echoserver/echoserver-static

   $ file examples/echoserver/echoserver-static
   examples/echoserver/echoserver-static: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=190d5cf4b1a16a8b3463e0f7248fe0e49ba36a5f, for GNU/Linux 3.2.0, stripped

   ✅
4. divinity76

   closed this as completedon Nov 18, 2025
5. divinity76 commented on Nov 22, 2025

   

   divinity76

   on Nov 22, 2025

   Last edited by divinity76

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   Found a better way that does not bypass makefile:

   $make LDFLAGS="-static -all-static -Lwolfssl/install/lib" examples/echoserver/echoserver
     CC       examples/echoserver/echoserver.o
     CC       src/libwolfssh_la-ssh.lo
     CC       src/libwolfssh_la-internal.lo
     CC       src/libwolfssh_la-log.lo
     CC       src/libwolfssh_la-io.lo
     CC       src/libwolfssh_la-port.lo
     CC       src/libwolfssh_la-wolfscp.lo
     CC       src/libwolfssh_la-wolfsftp.lo
     CC       src/libwolfssh_la-wolfterm.lo
     CCLD     src/libwolfssh.la
     CCLD     examples/echoserver/echoserver
   /usr/bin/ld: examples/echoserver/echoserver.o: in function `echoserver_test':
   echoserver.c:(.text+0x2910): warning: Using 'getpwnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   $ ldd examples/echoserver/echoserver
   	not a dynamic executable
   

   • However, glibc have an issue with using getpwnam statically, which can be solved by using musl instead of glibc, e.g

   $ CC=musl-gcc ./configure --enable-static --disable-shared --enable-scp --enable-sftp --enable-shell --with-wolfssl=wolfssl/install-musl
   (...)
   $ make LDFLAGS="-static -all-static -Lwolfssl/install/lib" examples/echoserver/echoserver
   

   However echoserver does not compile cleanly on musl, you have to replace #include <sys/errno.h> with #include <errno.h> to compile on musl. And that is actually an issue in the wolfssh code: historically many systems used sys/errno.h , but the C standard always, since C89, said it was errno.h, so unless you need to support pre-C89 compilers, yeah.. imma open a PR for that