Linux: link against libdl

Older versions of Rust on Linux, such as that used in Debian 11 in our
CI, require linking against libdl.  Were we linking with Cargo, this
would be included automatically, but since we're not, explicitly set it
in the system-specific config.

This library is part of libc, so linking against it if it happens to be
unnecessary will add no dependencies to the resulting binary.  In
addition, it is provided by both glibc and musl, so it should be
portable to almost all Linux systems.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/config.mak.uname b/config.mak.uname
index ccb3f71..7aab56c 100644 (file)
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -63,6 +63,7 @@ ifeq ($(uname_S),Linux)
        PROCFS_EXECUTABLE_PATH = /proc/self/exe
        HAVE_PLATFORM_PROCINFO = YesPlease
        COMPAT_OBJS += compat/linux/procinfo.o
+       EXTLIBS += -ldl
        # centos7/rhel7 provides gcc 4.8.5 and zlib 1.2.7.
         ifneq ($(findstring .el7.,$(uname_R)),)
                BASIC_CFLAGS += -std=c99