Thank you Dave, I knew it was simple, right over my head. Now the problem is not with the code, not with compiling, not with linking, but that the Rosetta Code task itself doesn't work (web address change, etc).
Thanks again for the help. On Fri, Oct 24, 2025 at 11:26 AM Dave Allured - NOAA Affiliate < [email protected]> wrote: > Add -lcurl. > > > On Fri, Oct 24, 2025 at 12:14 PM Kenneth Wolcott <[email protected]> > wrote: > >> Hi; >> >> trying to compile a Rosetta Code task written in C which uses curl; fails >> >> https://rosettacode.org/wiki/Web_scraping#C >> >> What am I missing? >> >> Perhaps I hav asked a similar question previously, hope not, apologies if >> so... >> >> Thanks, >> Ken Wolcott >> >> platform: arm64 Tahoe >> >> command: clang -v -o ./web_scraping ./web_scraping.c >> >> Failure output: >> >> Apple clang version 17.0.0 (clang-1700.3.19.1) >> Target: arm64-apple-darwin25.0.0 >> Thread model: posix >> InstalledDir: >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin >> >> "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" >> -cc1 -triple arm64-apple-macosx26.0.0 -Wundef-prefix=TARGET_OS_ >> -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage >> -Werror=implicit-function-declaration -emit-obj -dumpdir ./web_scraping- >> -disable-free -clear-ast-before-backend -disable-llvm-verifier >> -discard-value-names -main-file-name web_scraping.c -mrelocation-model pic >> -pic-level 2 -mframe-pointer=non-leaf -fno-strict-return -ffp-contract=on >> -fno-rounding-math -funwind-tables=1 -fobjc-msgsend-selector-stubs >> -target-sdk-version=26.0 -fvisibility-inlines-hidden-static-local-var >> -fdefine-target-os-macros -fno-assume-unique-vtables >> -fno-modulemap-allow-subdirectory-search -target-cpu apple-m1 >> -target-feature +zcm -target-feature +zcz -target-feature +v8.5a >> -target-feature +aes -target-feature +altnzcv -target-feature +ccdp >> -target-feature +complxnum -target-feature +crc -target-feature +dotprod >> -target-feature +fp-armv8 -target-feature +fp16fml -target-feature +fptoint >> -target-feature +fullfp16 -target-feature +jsconv -target-feature +lse >> -target-feature +neon -target-feature +pauth -target-feature +perfmon >> -target-feature +predres -target-feature +ras -target-feature +rcpc >> -target-feature +rdm -target-feature +sb -target-feature +sha2 >> -target-feature +sha3 -target-feature +specrestrict -target-feature +ssbs >> -target-abi darwinpcs -debugger-tuning=lldb >> -fdebug-compilation-dir=/Users/kwolcott/not_git_master/programming/from_Rosetta_Code/C/Web_Scraping >> -target-linker-version 1221.4 -v >> -fcoverage-compilation-dir=/Users/kwolcott/not_git_master/programming/from_Rosetta_Code/C/Web_Scraping >> -resource-dir >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/17 >> -isysroot >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk >> -I/usr/local/include -c-isystem /opt/local/include -cxx-isystem >> /opt/local/include -internal-isystem >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include >> -internal-isystem >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/17/include >> -internal-externc-isystem >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include >> -internal-externc-isystem >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include >> -internal-iframework >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks >> -internal-iframework >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/SubFrameworks >> -internal-iframework >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/Library/Frameworks >> -Wno-reorder-init-list -Wno-implicit-int-float-conversion >> -Wno-c99-designator -Wno-final-dtor-non-final-class -Wno-extra-semi-stmt >> -Wno-misleading-indentation -Wno-quoted-include-in-framework-header >> -Wno-implicit-fallthrough -Wno-enum-enum-conversion >> -Wno-enum-float-conversion -Wno-elaborated-enum-base -ferror-limit 19 >> -stack-protector 1 -fstack-check -mdarwin-stkchk-strong-link -fblocks >> -fencode-extended-block-signature -fregister-global-dtors-with-atexit >> -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fmax-type-align=16 -fcommon >> -clang-vendor-feature=+disableNonDependentMemberExprInCurrentInstantiation >> -fno-odr-hash-protocols -clang-vendor-feature=+enableAggressiveVLAFolding >> -clang-vendor-feature=+revert09abecef7bbf >> -clang-vendor-feature=+thisNoAlignAttr >> -clang-vendor-feature=+thisNoNullAttr >> -clang-vendor-feature=+disableAtImportPrivateFrameworkInImplementationError >> -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o >> /var/folders/f7/q14k59r11z310fdpl0m5mlc80000gn/T/web_scraping-babfe6.o -x c >> ./web_scraping.c >> clang -cc1 version 17.0.0 (clang-1700.3.19.1) default target >> arm64-apple-darwin25.0.0 >> ignoring nonexistent directory >> "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/local/include" >> ignoring nonexistent directory >> "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/Library/Frameworks" >> #include "..." search starts here: >> #include <...> search starts here: >> /usr/local/include >> /opt/local/include >> >> >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/17/include >> >> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include >> >> >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include >> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks >> (framework directory) >> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/SubFrameworks >> (framework directory) >> End of search list. >> >> "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" >> -demangle -lto_library >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/libLTO.dylib >> -no_deduplicate -dynamic -arch arm64 -platform_version macos 26.0.0 26.0 >> -syslibroot >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk >> -mllvm -enable-linkonceodr-outlining -o ./web_scraping -L/opt/local/lib >> -L/usr/local/lib >> /var/folders/f7/q14k59r11z310fdpl0m5mlc80000gn/T/web_scraping-babfe6.o >> -lSystem >> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/17/lib/darwin/libclang_rt.osx.a >> Undefined symbols for architecture arm64: >> "_curl_easy_cleanup", referenced from: >> _main in web_scraping-babfe6.o >> "_curl_easy_init", referenced from: >> _main in web_scraping-babfe6.o >> "_curl_easy_perform", referenced from: >> _main in web_scraping-babfe6.o >> "_curl_easy_setopt", referenced from: >> _main in web_scraping-babfe6.o >> _main in web_scraping-babfe6.o >> _main in web_scraping-babfe6.o >> _main in web_scraping-babfe6.o >> ld: symbol(s) not found for architecture arm64 >> clang: error: linker command failed with exit code 1 (use -v to see >> invocation) >> >>
