From: Simon McVittie <smcv@debian.org>
Date: Mon, 15 Aug 2022 16:47:26 +0100
Subject: Avoid hard-coding libdir in sdl2-config

This makes the -dev package multiarch co-installable, allowing compilation
of SDL programs for more than one architecture on the same system.

This is not an upstreamable change, since it relies on Debian-specific
assumptions:

* we are installing the library into a directory on the linker's default
  search path
* static linking is done with at least one of:
  - $DEB_HOST_MULTIARCH set, or
  - $PKG_CONFIG set to the host architecture pkg-config, or
  - $CC set to a compiler for the host architecture that supports the
    -print-multiarch argument (which Debian's gcc and clang do)

Adapted from an earlier patch by Gianfranco Costamagna.

Co-authored-by: Gianfranco Costamagna <locutusofborg@debian.org>
Forwarded: not-needed
Last-Update: 2022-08-15
---
 sdl2-config.in | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/sdl2-config.in b/sdl2-config.in
index f6eca76..70f0190 100644
--- a/sdl2-config.in
+++ b/sdl2-config.in
@@ -7,7 +7,6 @@ bindir=$(cd -P -- "$(dirname -- "$0")" && printf '%s\n' "$(pwd -P)")
 prefix=$(cd -P -- "$bindir/@bin_prefix_relpath@" && printf '%s\n' "$(pwd -P)")
 exec_prefix=@exec_prefix@
 exec_prefix_set=no
-libdir=@libdir@
 
 @ENABLE_STATIC_FALSE@usage="\
 @ENABLE_STATIC_FALSE@Usage: $0 [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs]"
@@ -49,12 +48,20 @@ while test $# -gt 0; do
       echo -I@includedir@/SDL2 @SDL_CFLAGS@
       ;;
 @ENABLE_SHARED_TRUE@    --libs)
-@ENABLE_SHARED_TRUE@      echo -L@libdir@ @SDL_RLD_FLAGS@ @SDL_LIBS@
+@ENABLE_SHARED_TRUE@      echo @SDL_RLD_FLAGS@ @SDL_LIBS@
 @ENABLE_SHARED_TRUE@      ;;
 @ENABLE_STATIC_TRUE@@ENABLE_SHARED_TRUE@    --static-libs)
 @ENABLE_STATIC_TRUE@@ENABLE_SHARED_FALSE@    --libs|--static-libs)
+@ENABLE_STATIC_TRUE@      if [ -n "${DEB_HOST_MULTIARCH-}" ]; then
+@ENABLE_STATIC_TRUE@          libdir="/usr/lib/$DEB_HOST_MULTIARCH"
+@ENABLE_STATIC_TRUE@      elif [ -n "${PKG_CONFIG}" ]; then
+@ENABLE_STATIC_TRUE@          libdir="$("$PKG_CONFIG" --variable=libdir sdl2)"
+@ENABLE_STATIC_TRUE@      else
+@ENABLE_STATIC_TRUE@          # Assume CC is set to a suitable gcc or clang version
+@ENABLE_STATIC_TRUE@          libdir="/usr/lib/$("$CC" -print-multiarch)"
+@ENABLE_STATIC_TRUE@      fi
 @ENABLE_STATIC_TRUE@      sdl_static_libs=$(echo "@SDL_LIBS@ @SDL_STATIC_LIBS@" | sed -E "s#-lSDL2[ $]#$libdir/libSDL2.a #g")
-@ENABLE_STATIC_TRUE@      echo -L@libdir@ $sdl_static_libs
+@ENABLE_STATIC_TRUE@      echo $sdl_static_libs
 @ENABLE_STATIC_TRUE@      ;;
     *)
       echo "${usage}" 1>&2