Debian Package rebuild

Undefined references can have different reasons. Here are some:
1) The most common issue is about the the inline behavior. clang is following by default the C99 standard while gcc promote GNU89.
The following code will build with gcc but fails with:
main.c:(.text+0x12): undefined reference to `xrealloc'

// the right declaration in C99 is:
// static inline void xrealloc() 
inline void xrealloc() { }

int main(){
    xrealloc();
    return 1;
}

besides the static, the command:
clang -std=gnu89 -o plop.exe main.c
will fix the issue.
See the clang website for more information.

2) An other issue is that gcc is that gcc optimizes the call to some functions at -O0 (causing -lm to be not necessary)

#include <math.h>
// Works: gcc -O0 -o plop plop.c 
// Fails:  clang -O0 -o plop plop.c
// Works: clang -lm -O0 -o plop plop.c
int main() {
    double plop = fabs(2.0);
    return 1;
}

3) There are also some rare issues with the --relocatable/-r linker flag.

Package	Version	Supposed error message	Full log	Bug report
apophenia	1.0+ds-8	ld: ../.libs/libapophenia.so: undefined reference to `__atomic_compare_exchange'	Log
audacity	2.3.3-1	atomic:224: undefined reference to `__atomic_is_lock_free'	Log	757531
bandwidthd	2.0.1+cvs20090917-11	bandwidthd.c:715: undefined reference to `Credit'	Log	757040
barcode	0.99-3	./code11.c:107: undefined reference to `rpl_calloc'	Log
beignet	1.3.2-7	ld: libgbe.so: undefined reference to `llvm::cfg::Update::dump() const'	Log	750380
ccbuild	2.0.7+git20160227.c1179286-2	./obj-x86_64-linux-gnu/./src/system/build.cc:165: undefined reference to `__kmpc_for_static_fini'	Log
chipmunk	7.0.3-2	./obj-x86_64-linux-gnu/demo/./demo/ContactGraph.c:125: undefined reference to `_Block_object_dispose'	Log
cpio	2.13+dfsg-2	./obj/gnu/../../gnu/xmalloc.c:100: undefined reference to `__muloti4'	Log
cpl-plugin-hawki	2.4.6+dfsg-1	ld: ../../hawki/.libs/libhawki.so: undefined reference to `__kmpc_for_static_fini'	Log
eccodes	2.17.0-2	ld: ../lib/libeccodes.so.0: undefined reference to `omp_init_nest_lock'	Log
elektroid	1.1-1	ld: connector.o: undefined reference to symbol 'ceil@@GLIBC_2.2.5'	Log
eterm	0.9.6-6	ld: ./.libs/libEterm.so: undefined reference to `posix_get_pty'	Log
gabedit	2.5.0-1	./src/Spectrum/NMRSpectrum.c:725: undefined reference to `__kmpc_for_static_init_4'	Log
gcc-10-cross	7	conftest.c:(.text.startup+0x7): undefined reference to `getexecname'	Log
gcc-10-cross-ports	6	conftest.c:72: undefined reference to `getexecname'	Log
gcc-9-cross	21	conftest.c:72: undefined reference to `getexecname'	Log
gcc-9-cross-ports	18	conftest.c:72: undefined reference to `getexecname'	Log
gdbm	1.18.1-5	./diet-build/src/../../src/findkey.c:168: undefined reference to `bcmp'	Log
gerbera	1.1.0+dfsg-3	./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/./obj-x86_64-linux-gnu/CMakeFiles/CMakeTmp/src.c:11: undefined reference to `pthread_create'	Log
goo	0.155+ds-2	./c/g2c/../grt.c:1047: undefined reference to `_CALL0'	Log
grass	7.8.2-1	ld: /<>/dist.x86_64-pc-linux-gnu/lib/libgrass_gmath.7.8.so: undefined reference to `__kmpc_reduce'	Log
integrit	4.1-1.1	cdb.c:(.text+0x261): undefined reference to `bcmp'	Log
kbdd	0.6-4	libkbdd.c:210: undefined reference to `_kbdd_proceed_event'	Log
lagan	2.0-6	./src/multial.c:829: undefined reference to `scoreOpp'	Log
libnetfilter-acct	1.0.3-2	./examples/nfacct-del.c:22: undefined reference to `nfacct_alloc'	Log
libnetfilter-cthelper	1.0.0-1	./examples/nfct-helper-get.c:13: undefined reference to `nfct_helper_alloc'	Log
libnetfilter-cttimeout	1.0.0-2	./examples/nfct-timeout-add.c:35: undefined reference to `nfct_timeout_alloc'	Log
libnetfilter-queue	1.0.3-1	./utils/nfqnl_test.c:83: undefined reference to `nfq_set_verdict'	Log
libraw	0.19.5-1	./src/libraw_cxx.cpp:3422: undefined reference to `__kmpc_for_static_fini'	Log
limesuite	20.01.0+dfsg-2	ld: CMakeFiles/LimeQuickTest.dir/LimeSDRTest.cpp.o: undefined reference to symbol 'pthread_create@@GLIBC_2.2.5'	Log
m4	1.4.18-4	./lib/./xalloc.h:120: undefined reference to `__muloti4'	Log
mlv	3.1.0-3	./MLV/input_box.c:883: undefined reference to `goUpInHistory_NTS'	Log
msxpertsuite	5.8.6-2	./debian/build/libmass/./libmass/Trace.cpp:1535: undefined reference to `__kmpc_for_static_init_4'	Log
mydumper	0.9.5-1.1	ld: CMakeFiles/mydumper.dir/mydumper.c.o: undefined reference to symbol 'ceilf@@GLIBC_2.2.5'	Log
nfft	3.3.2-2	ld: ../.libs/libnfft3l_threads.so: undefined reference to `__atomic_compare_exchange'	Log
opensta	0~20191111gitc018cb2+dfsg-1	ld: ../app/libOpenSTA.a(DispatchQueue.cc.o): undefined reference to symbol 'pthread_create@@GLIBC_2.2.5'	Log
php7.4	7.4.5-1	./ext-build/./Zend/zend_vm_execute.h:3739: undefined reference to `DTRACE_EXCEPTION_CAUGHT_ENABLED'	Log
plplot	5.15.0+dfsg-12	(.text+0x4a): undefined reference to `caml_data_segments'	Log
postgresql-12	12.2-4	./build/src/backend/utils/sort/./build/../src/backend/utils/sort/tuplesort.c:1271: undefined reference to `TRACE_POSTGRESQL_SORT_DONE'	Log
ptouch-driver	1.4.2-3	./rastertoptch.c:(.text+0x13be): undefined reference to `RLE_store_empty_lines'	Log
rarcrack	0.2-1	rarcrack.c:(.text+0x541): undefined reference to `nextpass'	Log
recode	3.6-24	ld: ./.libs/librecode.so: undefined reference to `aliases_lookup'	Log
ruby-curses	1.2.4-1	conftest.c:15: undefined reference to `init'	Log
ruby2.7	2.7.0-6	./vm.c:1764: undefined reference to `RUBY_DTRACE_METHOD_RETURN_ENABLED'	Log
soapyremote	0.5.1-2	ld: CMakeFiles/SoapySDRServer.dir/ServerListener.cpp.o: undefined reference to symbol 'pthread_create@@GLIBC_2.2.5'	Log
soapysdr	0.7.2-1	ld: ../lib/libSoapySDR.so.0.7.2: undefined reference to `pthread_create'	Log
spring	104.0+dfsg-6	atomic_base.h:377: undefined reference to `__atomic_is_lock_free'	Log
tesseract	4.1.1-2	./src/lstm/weightmatrix.cpp:296: undefined reference to `__kmpc_for_static_fini'	Log
usermode	1.113-2	./userhelper.c:241: undefined reference to `powl'	Log
wxhexeditor	0.24+repack-1	./src/HexDialogs.cpp:2771: undefined reference to `__kmpc_dispatch_next_4u'	Log
xdms	1.3.2-6	./src/u_deep.c:114: undefined reference to `update'	Log
xmltooling	3.0.5-1	./xmltooling/util/PThreads.cpp:177: undefined reference to `pthread_getspecific'	Log
yade	2020.01a-7	./debian/build/CMakeFiles/CMakeTmp/./debian/build/CMakeFiles/CMakeTmp/src.c:11: undefined reference to `pthread_create'	Log

53 errors

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