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GCC 6.2 and shared libraries: dlopen not found
- From: Richard Sewards <richard dot sewards at exfo dot com>
- To: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
- Date: Wed, 16 Nov 2016 15:35:55 +0000
- Subject: GCC 6.2 and shared libraries: dlopen not found
- Authentication-results: sourceware.org; auth=none
Hello,
I've built gcc 6.2.0 and I'm running into problems with programs
that use dlopen. Specifically, I'm compiling TCL and Tk with
gcc 6 and gcc 5 (for comparison).
With gcc 6, it appears I must add "-ldl" when creating libtcl.so
in order for a subsequent link that uses "-ltcl -ldl" will find
dlopen. Without -ldl when creating libtcl.so the subsequent link
fails to find dlopen even though it's invoked with -ldl. With
gcc 5 this is not necessary.
Is there any GCC 6 configuration option that can affect this? Both my gcc 6 and gcc 5 installation are built identically:
GCC 5 config:
Using built-in specs.
COLLECT_GCC=gcc-5.1.0
COLLECT_LTO_WRAPPER=/export/navusr3/local/gnu/5.1.0/H-x86_64-rhel6-linux-gnu/bin/../libexec/gcc/x86_64-rhel6-linux-gnu/5.1.0/lto-wrapper
Target: x86_64-rhel6-linux-gnu
Configured with: /usr/central.share/gnu/src/gcc-5.1.0/configure --srcdir=/usr/central.share/gnu/src/gcc-5.1.0 --prefix=/usr/central.share/gnu/5.1.0 --exec-prefix=/usr/central.share/gnu/5.1.0/H-x86_64-rhel6-linux-gnu --enable-languages=c,c++ --enable-shared --enable-__cxa_atexit --disable-nls --disable-werror --enable-lto --enable-plugin --enable-gold=default --build=x86_64-rhel6-linux-gnu --host=x86_64-rhel6-linux-gnu --target=x86_64-rhel6-linux-gnu
Thread model: posix
gcc version 5.1.0 (GCC)
GCC 6 config:
Using built-in specs.
COLLECT_GCC=gcc-6.2.0
COLLECT_LTO_WRAPPER=/export/navusr3/local/gnu/6.2.0/H-x86_64-rhel6-linux-gnu/bin/../libexec/gcc/x86_64-rhel6-linux-gnu/6.2.0/lto-wrapper
Target: x86_64-rhel6-linux-gnu
Configured with: /usr/central.share/gnu/src/gcc-6.2.0/configure --srcdir=/usr/central.share/gnu/src/gcc-6.2.0 --prefix=/usr/central.share/gnu/6.2.0 --exec-prefix=/usr/central.share/gnu/6.2.0/H-x86_64-rhel6-linux-gnu --enable-languages=c,c++ --enable-shared --enable-__cxa_atexit --disable-nls --disable-werror --enable-lto --enable-plugin --enable-gold=default --build=x86_64-rhel6-linux-gnu --host=x86_64-rhel6-linux-gnu --target=x86_64-rhel6-linux-gnu
Thread model: posix
gcc version 6.2.0 (GCC)
Thanks in advance,
--
Richard Sewards