[FFmpeg-devel] [PATCH 1/2] configure: don't force specific C++ standard library linking

[Kacper Michajłow]

Other C++ standard libraries exist. Also, this is not a proper way to
link the standard library anyway. Instead when a C++ dependency is
detected, switch to the C++ compiler driver to properly link everything.

Signed-off-by: Kacper Michajłow <kasper93 at gmail.com>
---
 configure | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/configure b/configure
index bd7f7697c8..90ee6e4f7d 100755
--- a/configure
+++ b/configure
@@ -3584,11 +3584,9 @@ bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr
 caca_outdev_deps="libcaca"
 decklink_deps_any="libdl LoadLibrary"
 decklink_indev_deps="decklink threads"
-decklink_indev_extralibs="-lstdc++"
 decklink_indev_suggest="libzvbi"
 decklink_outdev_deps="decklink threads"
 decklink_outdev_suggest="libklvanc"
-decklink_outdev_extralibs="-lstdc++"
 dshow_indev_deps="IBaseFilter"
 dshow_indev_extralibs="-lpsapi -lole32 -lstrmiids -luuid -loleaut32 -lshlwapi"
 fbdev_indev_deps="linux_fb_h"
@@ -4684,7 +4682,6 @@ msvc_common_flags(){
             -march=*)             ;;
             -lz)                  echo zlib.lib ;;
             -lx264)               echo libx264.lib ;;
-            -lstdc++)             ;;
             -l*)                  echo ${flag#-l}.lib ;;
             -LARGEADDRESSAWARE)   echo $flag ;;
             -L*)                  echo -libpath:${flag#-L} ;;
@@ -4984,6 +4981,18 @@ set_ccvars HOSTCC
 test -n "$cc_type" && enable $cc_type ||
     warn "Unknown C compiler $cc, unable to select optimal CFLAGS"
 
+cxx_deps=(
+    decklink
+    libglslang
+    libgme
+    libopenmpt
+    librubberband
+    libsnappy
+)
+for l in ${cxx_deps[@]}; do
+    enabled $l && ld_default=$cxx
+done
+
 : ${as_default:=$cc}
 : ${objcc_default:=$cc}
 : ${dep_cc_default:=$cc}
@@ -6706,12 +6715,12 @@ enabled libfribidi        && require_pkg_config libfribidi fribidi fribidi.h fri
 enabled libharfbuzz       && require_pkg_config libharfbuzz harfbuzz hb.h hb_buffer_create
 enabled libglslang && { check_lib spirv_compiler glslang/Include/glslang_c_interface.h glslang_initialize_process \
                             -lglslang -lMachineIndependent -lOSDependent -lHLSL -lOGLCompiler -lGenericCodeGen \
-                            -lSPVRemapper -lSPIRV -lSPIRV-Tools-opt -lSPIRV-Tools -lpthread -lstdc++ -lm ||
+                            -lSPVRemapper -lSPIRV -lSPIRV-Tools-opt -lSPIRV-Tools -lpthread -lm ||
                         require spirv_compiler glslang/Include/glslang_c_interface.h glslang_initialize_process \
                             -lglslang -lOSDependent -lHLSL -lOGLCompiler \
-                            -lSPVRemapper -lSPIRV -lSPIRV-Tools-opt -lSPIRV-Tools -lpthread -lstdc++ -lm; }
+                            -lSPVRemapper -lSPIRV -lSPIRV-Tools-opt -lSPIRV-Tools -lpthread -lm; }
 enabled libgme            && { check_pkg_config libgme libgme gme/gme.h gme_new_emu ||
-                               require libgme gme/gme.h gme_new_emu -lgme -lstdc++; }
+                               require libgme gme/gme.h gme_new_emu -lgme; }
 enabled libgsm            && { for gsm_hdr in "gsm.h" "gsm/gsm.h"; do
                                    check_lib libgsm "${gsm_hdr}" gsm_create -lgsm && break;
                                done || die "ERROR: libgsm not found"; }
@@ -6770,7 +6779,7 @@ enabled libopencv         && { check_headers opencv2/core/core_c.h &&
 enabled libopenh264       && require_pkg_config libopenh264 openh264 wels/codec_api.h WelsGetCodecVersion
 enabled libopenjpeg       && { check_pkg_config libopenjpeg "libopenjp2 >= 2.1.0" openjpeg.h opj_version ||
                                { require_pkg_config libopenjpeg "libopenjp2 >= 2.1.0" openjpeg.h opj_version -DOPJ_STATIC && add_cppflags -DOPJ_STATIC; } }
-enabled libopenmpt        && require_pkg_config libopenmpt "libopenmpt >= 0.2.6557" libopenmpt/libopenmpt.h openmpt_module_create -lstdc++ && append libopenmpt_extralibs "-lstdc++"
+enabled libopenmpt        && require_pkg_config libopenmpt "libopenmpt >= 0.2.6557" libopenmpt/libopenmpt.h openmpt_module_create
 enabled libopenvino       && { { check_pkg_config libopenvino openvino openvino/c/openvino.h ov_core_create && enable openvino2; } ||
                                 { check_pkg_config libopenvino openvino c_api/ie_c_api.h ie_c_api_version ||
                                   require libopenvino c_api/ie_c_api.h ie_c_api_version -linference_engine_c_api; } }
@@ -6789,12 +6798,12 @@ enabled librav1e          && require_pkg_config librav1e "rav1e >= 0.5.0" rav1e.
 enabled librist           && require_pkg_config librist "librist >= 0.2.7" librist/librist.h rist_receiver_create
 enabled librsvg           && require_pkg_config librsvg librsvg-2.0 librsvg-2.0/librsvg/rsvg.h rsvg_handle_render_cairo
 enabled librtmp           && require_pkg_config librtmp librtmp librtmp/rtmp.h RTMP_Socket
-enabled librubberband     && require_pkg_config librubberband "rubberband >= 1.8.1" rubberband/rubberband-c.h rubberband_new -lstdc++ && append librubberband_extralibs "-lstdc++"
+enabled librubberband     && require_pkg_config librubberband "rubberband >= 1.8.1" rubberband/rubberband-c.h rubberband_new
 enabled libshaderc        && require_pkg_config spirv_compiler "shaderc >= 2019.1" shaderc/shaderc.h shaderc_compiler_initialize
 enabled libshine          && require_pkg_config libshine shine shine/layer3.h shine_encode_buffer
 enabled libsmbclient      && { check_pkg_config libsmbclient smbclient libsmbclient.h smbc_init ||
                                require libsmbclient libsmbclient.h smbc_init -lsmbclient; }
-enabled libsnappy         && require libsnappy snappy-c.h snappy_compress -lsnappy -lstdc++
+enabled libsnappy         && require libsnappy snappy-c.h snappy_compress -lsnappy
 enabled libsoxr           && require libsoxr soxr.h soxr_create -lsoxr
 enabled libssh            && require_pkg_config libssh libssh libssh/sftp.h sftp_init
 enabled libspeex          && require_pkg_config libspeex speex speex/speex.h speex_decoder_init
-- 
2.34.1