In my patch for mariadb, I have to set LDFLAGS to '-lgcc_s':
https://lists.gnu.org/archive/html/guix-devel/2015-04/msg00321.html
without this, binaries are built linked with libstdc++.so, but
have a not found entry for libgcc_s.so, eg:
$ ldd ./build/sql/gen_lex_hash
linux-vdso.so.1 (0x00007ffcfbfea000)
libpthread.so.0 =>
/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib/libpthread.so.0
(0x00007ff62a182000)
libstdc++.so.6 =>
/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4/../../../libstdc++.so.6
(0x00007ff629e80000)
libm.so.6 =>
/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib/libm.so.6
(0x00007ff629b7e000)
libc.so.6 =>
/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib/libc.so.6
(0x00007ff6297de000)
/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib/ld-linux-x86-64.so.2
(0x00007ff62a39f000)
libgcc_s.so.1 => not found
The link script (sql/CMakeFiles/gen_lex_hash.dir/link.txt) contains:
--------------------------------------------------------------------
/gnu/store/4sqgnc9bc1kmn058yp4xnj4vpydmfzpq-gcc-4.8.4/bin/c++
-fno-exceptions -fno-rtti -O3 -g -static-libgcc -fno-omit-frame-pointer
-fno-strict-aliasing -Wno-uninitialized -DDBUG_OFF
CMakeFiles/gen_lex_hash.dir/gen_lex_hash.cc.o -o gen_lex_hash -lpthread
--------------------------------------------------------------------
And the build script (sql/CMakefils/gen_lex_hash.dir/flags.make):
-----------------------------------------------------------------
# CMAKE generated file: DO NOT EDIT!
# Generated by "Unix Makefiles" Generator, CMake Version 3.1
# compile CXX with /gnu/store/4sqgnc9bc1kmn058yp4xnj4vpydmfzpq-gcc-4.8.4/bin/c++
CXX_FLAGS = -fno-exceptions -fno-rtti -O3 -g -static-libgcc
-fno-omit-frame-pointer -fno-strict-aliasing -Wno-uninitialized -DDBUG_OFF
-I/var/tmp/nix-build-mariadb-10.0.17.drv-0/build/include
-I/var/tmp/nix-build-mariadb-10.0.17.drv-0/mariadb-10.0.17/include
-I/var/tmp/nix-build-mariadb-10.0.17.drv-0/mariadb-10.0.17/sql
-I/var/tmp/nix-build-mariadb-10.0.17.drv-0/mariadb-10.0.17/zlib
-I/var/tmp/nix-build-mariadb-10.0.17.drv-0/mariadb-10.0.17/extra/yassl/include
-I/var/tmp/nix-build-mariadb-10.0.17.drv-0/mariadb-10.0.17/extra/yassl/taocrypt/include
-I/var/tmp/nix-build-mariadb-10.0.17.drv-0/build/sql -DHAVE_YASSL
-DYASSL_PREFIX -DHAVE_OPENSSL -DMULTI_THREADED
CXX_DEFINES = -DHAVE_CONFIG_H -DHAVE_EVENT_SCHEDULER -DHAVE_POOL_OF_THREADS
-DMYSQL_SERVER
------------------------------------------------------------------
As Ludovic Courtès tell, '-static-libgcc' may be the issue.
