On 2026/06/15 12:42, Thomas Dreibholz wrote:
> I am trying to build HiPerConTracer 
> (https://www.nntb.no/~dreibh/hipercontracer/) under
> OpenBSD. This fails with linker error for BOOST iostreams and zstd filter. I 
> tracked down the
> issue to the following simple test program:

The OpenBSD port of boost doesn't build the optional zstd support.
This diff would enable it, if we want to do that...

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/boost/Makefile,v
diff -u -p -r1.163 Makefile
--- Makefile    18 May 2026 05:48:17 -0000      1.163
+++ Makefile    15 Jun 2026 12:35:37 -0000
@@ -6,6 +6,7 @@ COMMENT-main=   free peer-reviewed portabl
 COMMENT-md=    machine-dependent libraries for boost
 
 VERSION=       1.91.0
+REVISION-main= 0
 DISTNAME=      boost_${VERSION:S/./_/g}
 PKGNAME=       boost-${VERSION}
 EPOCH=         0
@@ -69,8 +70,9 @@ MAINTAINER=   Brad Smith <[email protected]
 # Boost
 PERMIT_PACKAGE=        Yes
 
-WANTLIB=       ${COMPILER_LIBCXX} bz2 c iconv icudata icui18n icuuc kvm m z
-WANTLIB-md+=   ${COMPILER_LIBCXX} boost_filesystem-mt boost_regex-mt 
+WANTLIB=       ${COMPILER_LIBCXX} bz2 c iconv icudata icui18n icuuc \
+               kvm m z zstd
+WANTLIB-md+=   ${COMPILER_LIBCXX} boost_filesystem-mt boost_regex-mt
 WANTLIB-md+=   icudata icui18n icuuc m
 
 COMPILER=      base-clang ports-gcc
@@ -83,6 +85,7 @@ MODPY_RUNDEP= No
 BUILD_DEPENDS= math/py-numpy
 
 LIB_DEPENDS=   archivers/bzip2 \
+               archivers/zstd \
                converters/libiconv \
                textproc/icu4c
 
@@ -104,6 +107,8 @@ TOOLSET=    gcc
 BJAM_CONFIG=   -sICU_PATH=${LOCALBASE} \
                -sBZIP2_INCLUDE=${LOCALBASE}/include \
                -sBZIP2_LIBPATH=${LOCALBASE}/lib \
+               -sZSTD_INCLUDE=${LOCALBASE}/include \
+               -sZSTD_LIBPATH=${LOCALBASE}/lib \
                -q \
                -d+2 \
                -j${MAKE_JOBS} \

> clang t1.cc -o t1 -I /usr/local/include/ -I /usr/pkg/include/ -L 
> /usr/local/lib -L /usr/pkg/lib
> -lboost_iostreams -lstdc++

You certainly shouldn't be using -lstdc++ with clang on OpenBSD.
(And I'd be pretty surprised if you should be doing that on FreeBSD).

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