thirdparty: pin AR/RANLIB in autotools foreign builds (fix macOS jemalloc link)#210
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…lloc link) _configure passed CC/CXX from the resolved toolchain but let AR/RANLIB fall through to PATH. On macOS, a stray GNU-format `ar` ahead of /usr/bin/ar (e.g. Homebrew binutils / an llvm-ar in --format=gnu mode) builds a package's static archive in GNU format -- with `/` and `//` index members -- which Apple's ld rejects at link time: ld: archive member '/' not a mach-o file in '.../lib/libjemalloc.a' This surfaced on je_server (jemalloc's libjemalloc.a is built by a direct $(AR) crus Makefile rule, so it picks up the PATH ar; libtool-built archives like libtcmalloc/jsoncpp/ctemplate were unaffected because libtool drives the archiver consistently). The gperftools profiler archives hit the same GNU format but are gated Linux-only, so they never reached a macOS link. Pin AR/RANLIB the same way CC/CXX already are: force the system BSD ar/ranlib on macOS (they emit a `__.SYMDEF` archive ld accepts), and honor the toolchain ar elsewhere (GNU archives are fine for GNU ld). Passed both as env and as autoconf precious-vars so the generated Makefile uses them (verified: `AR = /usr/bin/ar`, archive members are `__.SYMDEF SORTED` + objects, je_server links). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Problem
On macOS,
blade build //...fails linkingje_server:_configurepinsCC/CXXfrom the resolved toolchain but letsAR/RANLIBfall through to PATH. When a GNU-formatarsits ahead of/usr/bin/arin PATH (Homebrew binutils, or anllvm-arinvoked in--format=gnumode), a package built by a direct$(AR) crusMakefile rule produces a GNU-format archive (with/and//index members), which Apple'sldrejects.Why only jemalloc surfaced it
_la-object names) drive the archiver consistently → clean__.SYMDEFarchives → fine.$(AR)archives (jemalloc; gperftools' profiler/tcmalloc_and_profiler) pick up the PATHar→ GNU format.libjemalloc.ais in the macOS link graph (gperftools' profiler archives are gated Linux-only), soje_serverwas the only failure.Verified Apple
ldrejects both pure-GNU and GNU+ranlib-mixed archives — the format itself is the issue.Fix
Pin
AR/RANLIBthe same wayCC/CXXalready are: force the system BSD/usr/bin/ar+/usr/bin/ranlibon macOS (they emit a__.SYMDEFarchiveldaccepts), honor the toolchainarelsewhere. Passed both as env and as autoconf precious-vars so the generated Makefile uses them.Covers all
autotools_buildpackages (jemalloc, gperftools, …).Validation
Clean rebuild on macOS:
Makefilenow hasAR = /usr/bin/arlibjemalloc.amembers:__.SYMDEF SORTED+ objects (no///`)je_serverlinks;_je_mallctlresolves🤖 Generated with Claude Code