gen_context (secp256k1) is built using gcc despite CC=clang #17673

gen_context (secp256k1) is built using gcc despite CC=clang:

$ make distclean
$ ./autogen.sh && CC=clang CXX=clang++ ./configure --with-incompatible-bdb \
      --enable-debug --with-sanitizers=address && make clean && make check
…
make[3]: Entering directory '…/src/secp256k1'
gcc -I. -g -O2 -Wall -Wextra -Wno-unused-function -c src/gen_context.c -o gen_context.o

that is on purpose: because it is used to generate code used in the build, it's built using an auto-detected host C compiler using CC would break cross-compilation you want to override CC_FOR_BUILD instead

@laanwj Makes sense. Thanks!