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LDFLAGS passed too late making libs linked incorrectly, e.g. OpenSSL #14893

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michael-o opened this issue Sep 13, 2024 · 7 comments
Open

LDFLAGS passed too late making libs linked incorrectly, e.g. OpenSSL #14893

michael-o opened this issue Sep 13, 2024 · 7 comments
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build help wanted KNOWN_BUGS material

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@michael-o
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michael-o commented Sep 13, 2024 •
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I did this

Compiling latest curl on HP-UX and linking against not the system provided OpenSSL (which is on the default loader/linker path), but against a self-compiled newer version:

export PREFIX=/opt/ports
export LIBDIR=$PREFIX/lib/hpux32
export SYSCONFDIR=/etc/opt/ports
export CC=/opt/aCC/bin/aCC
export CXX=/opt/aCC/bin/aCC
export CONFIGURE="./configure --prefix=$PREFIX --libdir=$LIBDIR --sysconfdir=$SYSCONFDIR --localstatedir=/var"
export CPPFLAGS="-I$PREFIX/include"
export CFLAGS="+We901"
export CXXFLAGS="+We901"
export LDFLAGS="-L$LIBDIR"
export HELP="./configure --help"
export OPENSSLDIR=$SYSCONFDIR/ssl

call:

$CONFIGURE --with-gssapi=$PREFIX --with-zlib --with-openssl=$PREFIX \
 --disable-ftp --disable-ldap --disable-rtsp --disable-dict --disable-pop3 --disable-gopher \
 --disable-imap --disable-tftp --disable-telnet --disable-smb --without-libssh2 \
 --with-ca-fallback --disable-threaded-resolver --disable-dependency-tracking --disable-mqtt \
 --disable-alt-svc --disable-ntlm --disable-tls-srp --without-libpsl

Summary:

  Host setup:       ia64-hp-hpux11.31
  Install prefix:   /opt/ports
  Compiler:         /opt/aCC/bin/aCC -AC99
   CFLAGS:          +We901 -z +W 4227,4255 +O2
   CFLAGS extras:
   CPPFLAGS:        -I/opt/ports/include -I/opt/ports/include -I/opt/ports/include
   LDFLAGS:         -L/opt/ports/lib/hpux32 -L/opt/ports/lib
   LIBS:            -lssl -lcrypto -L/opt/ports/lib/hpux32 -Wl,+b,/opt/ports/lib/hpux32 -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lz

  curl version:     8.10.0
  SSL:              enabled (OpenSSL v3+)
  SSH:              no      (--with-{libssh,libssh2})
  zlib:             enabled
  brotli:           no      (--with-brotli)
  zstd:             no      (--with-zstd)
  GSS-API:          enabled (MIT Kerberos/Heimdal)
  GSASL:            no      (libgsasl not found)
  TLS-SRP:          no      (--enable-tls-srp)
  resolver:         default (--enable-ares / --enable-threaded-resolver)
  IPv6:             enabled
  Unix sockets:     enabled
  IDN:              no      (--with-{libidn2,winidn})
  Build docs:       enabled (--disable-docs)
  Build libcurl:    Shared=yes, Static=yes
  Built-in manual:  enabled
  --libcurl option: enabled (--disable-libcurl-option)
  Verbose errors:   enabled (--disable-verbose)
  Code coverage:    disabled
  SSPI:             no      (--enable-sspi)
  ca cert bundle:   no
  ca cert path:     no
  ca fallback:      yes
  LDAP:             no      (--enable-ldap / --with-ldap-lib / --with-lber-lib)
  LDAPS:            no      (--enable-ldaps)
  RTSP:             no      (--enable-rtsp)
  RTMP:             no      (--with-librtmp)
  PSL:              no      (--with-libpsl)
  Alt-svc:          no
  Headers API:      enabled (--disable-headers-api)
  HSTS:             enabled (--disable-hsts)
  HTTP1:            enabled (internal)
  HTTP2:            no      (--with-nghttp2)
  HTTP3:            no      (--with-ngtcp2 --with-nghttp3, --with-quiche, --with-openssl-quic, --with-msh3)
  ECH:              no      (--enable-ech)
  WebSockets:       no      (--enable-websockets)
  Protocols:        file http https ipfs ipns smtp smtps
  Features:         GSS-API HSTS HTTPS-proxy IPv6 Kerberos Largefile libz SPNEGO SSL UnixSockets

Result:

# ldd /opt/ports/bin/curl

/opt/ports/bin/curl:
        libcurl.so.12 =>        /opt/ports/lib/hpux32/libcurl.so.12
        libssl.so.3 =>  /opt/ports/lib/hpux32/libssl.so.3
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3
        libgssapi_krb5.2 =>     /opt/ports/lib/hpux32/libgssapi_krb5.2
        libkrb5.3 =>    /opt/ports/lib/hpux32/libkrb5.3
        libk5crypto.3 =>        /opt/ports/lib/hpux32/libk5crypto.3
        libcom_err.3 => /opt/ports/lib/hpux32/libcom_err.3
        libz.so =>      /opt/ports/lib/hpux32/libz.so
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libssl.so.1.1 =>        /usr/lib/hpux32/libssl.so.1.1
        libcrypto.so.1.1 =>     /usr/lib/hpux32/libcrypto.so.1.1
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1
        libpthread.so.1 =>      /usr/lib/hpux32/libpthread.so.1
        libkrb5support.0 =>     /opt/ports/lib/hpux32/libkrb5support.0
        libintl.so.12 =>        /opt/ports/lib/hpux32/libintl.so.12
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libcrypto.so.1.1 =>     /usr/lib/hpux32/libcrypto.so.1.1
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1
        libpthread.so.1 =>      /usr/lib/hpux32/libpthread.so.1
        libiconv.so.8 =>        /opt/ports/lib/hpux32/libiconv.so.8
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
# ldd /opt/ports/lib/hpux32/libcurl.so

/opt/ports/lib/hpux32/libcurl.so:
        libssl.so.1.1 =>        /usr/lib/hpux32/libssl.so.1.1
        libcrypto.so.1.1 =>     /usr/lib/hpux32/libcrypto.so.1.1
        libgssapi_krb5.2 =>     /opt/ports/lib/hpux32/libgssapi_krb5.2
        libkrb5.3 =>    /opt/ports/lib/hpux32/libkrb5.3
        libk5crypto.3 =>        /opt/ports/lib/hpux32/libk5crypto.3
        libcom_err.3 => /opt/ports/lib/hpux32/libcom_err.3
        libz.so =>      /opt/ports/lib/hpux32/libz.so
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libcrypto.so.1.1 =>     /usr/lib/hpux32/libcrypto.so.1.1
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1
        libpthread.so.1 =>      /usr/lib/hpux32/libpthread.so.1
        libkrb5support.0 =>     /opt/ports/lib/hpux32/libkrb5support.0
        libintl.so.12 =>        /opt/ports/lib/hpux32/libintl.so.12
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1
        libiconv.so.8 =>        /opt/ports/lib/hpux32/libiconv.so.8
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1

I have now both OpenSSL version in the runtime path because in lib/Makefile.in libcurl_la_LINK and src/Makefile.in libcurltool_la_LINK have LDFLAGS after LIBS (LIBCURL_PC_LIBS_PRIVATE) the linker finds the default path first for libssl.so.
verbose:

# ldd -s -v /opt/ports/bin/curl

/opt/ports/bin/curl:

  find library=libcurl.so.12; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libcurl.so.12
        libcurl.so.12 =>        /opt/ports/lib/hpux32/libcurl.so.12

  find library=libssl.so.3; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libssl.so.3
        libssl.so.3 =>  /opt/ports/lib/hpux32/libssl.so.3

  find library=libcrypto.so.3; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libcrypto.so.3
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3

  find library=libgssapi_krb5.2; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libgssapi_krb5.2
        libgssapi_krb5.2 =>     /opt/ports/lib/hpux32/libgssapi_krb5.2

  find library=libkrb5.3; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libkrb5.3
        libkrb5.3 =>    /opt/ports/lib/hpux32/libkrb5.3

  find library=libk5crypto.3; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libk5crypto.3
        libk5crypto.3 =>        /opt/ports/lib/hpux32/libk5crypto.3

  find library=libcom_err.3; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libcom_err.3
        libcom_err.3 => /opt/ports/lib/hpux32/libcom_err.3

  find library=libz.so; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libz.so
        libz.so =>      /opt/ports/lib/hpux32/libz.so

  find library=libc.so.1; required by /opt/ports/bin/curl
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libc.so.1
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1

  find library=libssl.so.1.1; required by /opt/ports/lib/hpux32/libcurl.so.12
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libssl.so.1.1
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libssl.so.1.1
        libssl.so.1.1 =>        /usr/lib/hpux32/libssl.so.1.1

  find library=libcrypto.so.1.1; required by /opt/ports/lib/hpux32/libcurl.so.12
    search path=/opt/ports/lib/hpux32  (RPATH)
    trying path=/opt/ports/lib/hpux32/libcrypto.so.1.1
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libcrypto.so.1.1
        libcrypto.so.1.1 =>     /usr/lib/hpux32/libcrypto.so.1.1

  find library=libcrypto.so.3; required by /opt/ports/lib/hpux32/libssl.so.3
    search path=.:/opt/ports/lib/hpux32:/usr/lib/hpux32:/opt/langtools/lib/hpux32  (RPATH)
    trying path=./libcrypto.so.3
    trying path=/opt/ports/lib/hpux32/libcrypto.so.3
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3

  find library=libdl.so.1; required by /opt/ports/lib/hpux32/libssl.so.3
    search path=.:/opt/ports/lib/hpux32:/usr/lib/hpux32:/opt/langtools/lib/hpux32  (RPATH)
    trying path=./libdl.so.1
    trying path=/opt/ports/lib/hpux32/libdl.so.1
    trying path=/usr/lib/hpux32/libdl.so.1
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1

  find library=libpthread.so.1; required by /opt/ports/lib/hpux32/libssl.so.3
    search path=.:/opt/ports/lib/hpux32:/usr/lib/hpux32:/opt/langtools/lib/hpux32  (RUNPATH)
    trying path=./libpthread.so.1
    trying path=/opt/ports/lib/hpux32/libpthread.so.1
    trying path=/usr/lib/hpux32/libpthread.so.1
        libpthread.so.1 =>      /usr/lib/hpux32/libpthread.so.1

  find library=libkrb5support.0; required by /opt/ports/lib/hpux32/libgssapi_krb5.2
    search path=/opt/ports/lib/hpux32  (RPATH)
    trying path=/opt/ports/lib/hpux32/libkrb5support.0
        libkrb5support.0 =>     /opt/ports/lib/hpux32/libkrb5support.0

  find library=libintl.so.12; required by /opt/ports/lib/hpux32/libgssapi_krb5.2
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libintl.so.12
        libintl.so.12 =>        /opt/ports/lib/hpux32/libintl.so.12

  find library=libc.so.1; required by /opt/ports/lib/hpux32/libz.so
    search path=/opt/ports/lib/hpux32:/usr/lib/hpux32:/opt/langtools/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libc.so.1
    trying path=/usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1

  find library=libcrypto.so.1.1; required by /usr/lib/hpux32/libssl.so.1.1
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libcrypto.so.1.1
        libcrypto.so.1.1 =>     /usr/lib/hpux32/libcrypto.so.1.1

  find library=libdl.so.1; required by /usr/lib/hpux32/libssl.so.1.1
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libdl.so.1
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1

  find library=libpthread.so.1; required by /usr/lib/hpux32/libssl.so.1.1
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libpthread.so.1
        libpthread.so.1 =>      /usr/lib/hpux32/libpthread.so.1

  find library=libiconv.so.8; required by /opt/ports/lib/hpux32/libintl.so.12
    search path=/opt/ports/lib/hpux32  (RUNPATH)
    trying path=/opt/ports/lib/hpux32/libiconv.so.8
        libiconv.so.8 =>        /opt/ports/lib/hpux32/libiconv.so.8

  find library=libc.so.1; required by /opt/ports/lib/hpux32/libintl.so.12
    search path=/opt/ports/lib/hpux32  (RPATH)
    trying path=/opt/ports/lib/hpux32/libc.so.1
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1

  find library=libc.so.1; required by /opt/ports/lib/hpux32/libiconv.so.8
    search path=/usr/lib/hpux32  (default)
    trying path=/usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1

I cannot tell whether any of the recent changes should be reverted or not, but that comes a surprise because I explicitly pass CPPFLAGS and LDFLAGS to have autoconf to find the headers and libraries in the right place and not in default locations.
#12312 looks like a workaround to make it work again:

root@deblndw002x:/var/tmp/ports/work/curl-8.10.0
# gmake -j4 CURL_LDFLAGS_LIB=$LDFLAGS CURL_LDFLAGS_BIN=$LDFLAGS 
...
# gmake install
...
# ldd /opt/ports/lib/hpux32/libcurl.so

/opt/ports/lib/hpux32/libcurl.so:
        libssl.so.3 =>  /opt/ports/lib/hpux32/libssl.so.3
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3
        libgssapi_krb5.2 =>     /opt/ports/lib/hpux32/libgssapi_krb5.2
        libkrb5.3 =>    /opt/ports/lib/hpux32/libkrb5.3
        libk5crypto.3 =>        /opt/ports/lib/hpux32/libk5crypto.3
        libcom_err.3 => /opt/ports/lib/hpux32/libcom_err.3
        libz.so =>      /opt/ports/lib/hpux32/libz.so
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1
        libpthread.so.1 =>      /usr/lib/hpux32/libpthread.so.1
        libkrb5support.0 =>     /opt/ports/lib/hpux32/libkrb5support.0
        libintl.so.12 =>        /opt/ports/lib/hpux32/libintl.so.12
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libiconv.so.8 =>        /opt/ports/lib/hpux32/libiconv.so.8
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
# ldd  /opt/ports/bin/curl

/opt/ports/bin/curl:
        libcurl.so.12 =>        /opt/ports/lib/hpux32/libcurl.so.12
        libssl.so.3 =>  /opt/ports/lib/hpux32/libssl.so.3
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3
        libgssapi_krb5.2 =>     /opt/ports/lib/hpux32/libgssapi_krb5.2
        libkrb5.3 =>    /opt/ports/lib/hpux32/libkrb5.3
        libk5crypto.3 =>        /opt/ports/lib/hpux32/libk5crypto.3
        libcom_err.3 => /opt/ports/lib/hpux32/libcom_err.3
        libz.so =>      /opt/ports/lib/hpux32/libz.so
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libcrypto.so.3 =>       /opt/ports/lib/hpux32/libcrypto.so.3
        libdl.so.1 =>   /usr/lib/hpux32/libdl.so.1
        libpthread.so.1 =>      /usr/lib/hpux32/libpthread.so.1
        libkrb5support.0 =>     /opt/ports/lib/hpux32/libkrb5support.0
        libintl.so.12 =>        /opt/ports/lib/hpux32/libintl.so.12
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libiconv.so.8 =>        /opt/ports/lib/hpux32/libiconv.so.8
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1
        libc.so.1 =>    /usr/lib/hpux32/libc.so.1

Well, using CURL_LDFLAGS_{LIB,BIN} is not straight forward at all because it is not documented, nor does one know that it has to be passed to make instead of to ./configure

I expected the following

LDFAGS passed before LIBS so the linker can pick up the right library to build up RPATH.
There has been some changes in terms of linking in the past few months looking at the closed issues and PRs.

curl/libcurl version

curl --version
curl 8.10.0 (ia64-hp-hpux11.31) libcurl/8.10.0 OpenSSL/3.0.15 zlib/1.3.1
Release-Date: 2024-09-11
Protocols: file http https ipfs ipns smtp smtps
Features: GSS-API HSTS HTTPS-proxy IPv6 Kerberos Largefile libz SPNEGO SSL UnixSockets

operating system

HP-UX deblndw0 B.11.31 U ia64 HP-UX
aCC: HP C/aC++ B3910B A.06.29 [Oct 18 2016]
/opt/ports/bin/openssl version
OpenSSL 3.0.15 3 Sep 2024 (Library: OpenSSL 3.0.15 3 Sep 2024)
/usr/bin/openssl version
OpenSSL 1.1.1w 11 Sep 2023
@michael-o michael-o changed the title LDFLAGS passed too late making libs linked incorrectly, e..g., OpenSSL LDFLAGS passed too late making libs linked incorrectly, e.g. OpenSSL Sep 13, 2024
@bagder bagder added the build label Sep 13, 2024
@bagder
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bagder commented Sep 13, 2024

When configure runs, does it detect the correct OpenSSL version/prefix?

If so, doesn't the build use the correct include files etc?

If so, doesn't the resulting build use OpenSSL 3 APIs that is not available in OpenSSL v1, so how can it even use the wrong library?

@michael-o
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When configure runs, does it detect the correct OpenSSL version/prefix?

If so, doesn't the build use the correct include files etc?

Here is the relevant output:

checking for HMAC_Update in -lcrypto... yes
checking for SSL_connect in -lssl... yes
checking for openssl/x509.h... yes
checking for openssl/rsa.h... yes
checking for openssl/crypto.h... yes
checking for openssl/pem.h... yes
checking for openssl/ssl.h... yes
checking for openssl/err.h... yes
checking for BoringSSL... no
checking for AWS-LC... no
checking for LibreSSL... no
checking for OpenSSL >= v3... yes
checking for SSL_set_quic_use_legacy_codepoint... no
configure: OpenSSL version does not speak QUIC API
configure: Added /opt/ports/lib to CURL_LIBRARY_PATH
checking for SRP support in OpenSSL... yes
checking for QUIC support and OpenSSL >= 3.3... no
configure: built with one SSL backend
checking default CA cert bundle/path... configure: want unset ca no
no
checking whether to use built-in CA store of SSL library... yes
checking CA cert bundle path to embed... no

and I can see in config.log that each of these checks properly uses -I/opt/ports/include before conftest.c, so the OpenSSL 3.0.x headers are used.

If so, doesn't the resulting build use OpenSSL 3 APIs that is not available in OpenSSL v1, so how can it even use the wrong library?

See at ldd output. curl(1) does link against 3, but libcurl.so does not. I need to see how my custom applications look after this change.

I also did check OPENSSL_VERSION_NUMBER from lib/vtls/openssl.h, it is >= 3.

@vszakats
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Rings some bells from the the old Solaris issue where linker flags are positional, but libtool isn't aware of it. Ref #13317.

(A previous solution was to repeat LDFLAGS after LIBS unconditionally, but that broke builds where LDFLAGS contained options that musn't be repeated (e.g. specifying objects).)

@michael-o
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michael-o commented Sep 13, 2024 •
edited
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Rings some bells from the the old Solaris issue where linker flags are positional, but libtool isn't aware of it. Ref #13317.

(A previous solution was to repeat LDFLAGS after LIBS unconditionally, but that broke builds where LDFLAGS contained options that musn't be repeated (e.g. specifying objects).)

That's the one I found as well. Checked the manpage of ld, though it is explicitly stated, several spots indicate that it is positional. Read: left to right.

@michael-o
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@vszakats Picking up your comment: #13317 (comment)

The manpage of aCC says clearly:

  -L dir         Change the algorithm used by the linker to search for
                 libx.so or libx.a.  The -L option causes ld to search
                 in dir before searching in the default locations.  This
                 option is effective only if it precedes the -l option
                 on the command line.  See ld(1) for details.

From the loader manpage:

       -L dir         Search for libx.a, libx.sl, or libx.so, in dir
                      before looking in default locations.  You can
                      specify more than one directory, but each must be
                      preceded by the -L option.  The -L option is
                      effective only if it precedes the -l option on the
                      command line.

@vszakats
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vszakats commented Sep 13, 2024 •
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What's curious is that libtool isn't aware of this.

Also in general it's a good practice to have LDFLAGS precede LIBS. I wonder why it isn't like that by default. Or if there is any knob to turn, to make it work like that?

@bagder
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bagder commented Sep 25, 2024

Feels like an issue someone building on such a platform needs to work on since trying to address this blindly is likely to get it (subtly) wrong and make it into a very slow and tedious process.

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@bagder @michael-o @vszakats